CN120121251A - Micro fan vibration test and vibration reduction device parameter measurement system - Google Patents
Micro fan vibration test and vibration reduction device parameter measurement system Download PDFInfo
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- CN120121251A CN120121251A CN202510408695.5A CN202510408695A CN120121251A CN 120121251 A CN120121251 A CN 120121251A CN 202510408695 A CN202510408695 A CN 202510408695A CN 120121251 A CN120121251 A CN 120121251A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/022—Vibration control arrangements, e.g. for generating random vibrations
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/025—Measuring arrangements
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M7/00—Vibration-testing of structures; Shock-testing of structures
- G01M7/02—Vibration-testing by means of a shake table
- G01M7/04—Monodirectional test stands
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Abstract
本申请提供一种微型风机的振动测试及减振装置参数测量系统，涉及医疗设备测试技术领域。包括：支撑平台、待测的微型风机、减振装置以及振动测试系统；微型风机，用于接收多个转动指令，根据各转动指令执行转动，并在转动过程中产生振动；振动测试系统，用于在微型风机在振动时，在多个预设的测量点上采集初始振动信号，并根据初始振动信号，确定微型风机的振动参数；减振装置，用于在微型风机振动时产生的初始振动信号执行减振；振动测试系统，还用于获取减振装置对初始振动信号执行减振后的响应信号，并根据初始振动信号与响应信号，确定减振装置的减振参数，实现了对急救转运呼吸机中微型风机及其配套减振装置在真实工况下的联合动态参数测量。
The present application provides a vibration test system for a micro fan and a vibration reduction device parameter measurement system, which relates to the field of medical equipment testing technology. The system includes: a support platform, a micro fan to be tested, a vibration reduction device, and a vibration test system; the micro fan is used to receive multiple rotation instructions, perform rotation according to each rotation instruction, and generate vibration during the rotation process; the vibration test system is used to collect initial vibration signals at multiple preset measurement points when the micro fan is vibrating, and determine the vibration parameters of the micro fan according to the initial vibration signal; the vibration reduction device is used to perform vibration reduction on the initial vibration signal generated when the micro fan vibrates; the vibration test system is also used to obtain the response signal after the vibration reduction device performs vibration reduction on the initial vibration signal, and determine the vibration reduction parameters of the vibration reduction device according to the initial vibration signal and the response signal, so as to realize the joint dynamic parameter measurement of the micro fan and its supporting vibration reduction device in the emergency transport ventilator under real working conditions.
Description
Technical Field
The invention relates to the technical field of medical equipment testing, in particular to a vibration testing and vibration damping device parameter measuring system of a micro fan.
Background
First aid transportation respirators are used as key medical equipment, and an internal micro fan plays an important role in providing stable airflow. Because the fan is small in size, high in rotating speed and complex in blade structure, the vibration characteristics of the fan are directly related to the stability of equipment, noise control and patient safety.
In the related art, researches on the vibration detection of the micro-fan in the emergency transportation respirator are mainly focused on fault diagnosis and flow field optimization, and the construction of a comprehensive platform aiming at the vibration test of the micro-fan is not perfect. Meanwhile, in order to reduce the influence on a system when the micro fan vibrates, a damping key component such as a damping device based on an O-shaped rubber ring is often adopted in the micro fan of the breathing machine, and conventionally, the O-shaped rubber ring is mainly used for sealing, but the mechanical characteristics (such as dynamic stiffness and dynamic damping) of the O-shaped rubber ring under dynamic excitation directly influence the damping effect. However, in the prior art, the dynamic characteristic test methods of the O-shaped rubber ring under different compression amounts are scattered, and an integrated test platform is lacked.
Therefore, a comprehensive test platform is urgently needed, high-precision and non-contact measurement of the vibration state of the micro fan can be realized, a dynamic characteristic test device can be integrated, and the dynamic parameters of the O-shaped rubber ring for vibration reduction of the micro fan can be measured, so that a unified test and analysis system is formed, and reliable data support is provided for fan fault diagnosis, performance optimization and research and development of the vibration reduction device.
Disclosure of Invention
The invention aims to provide a vibration testing and vibration damping device parameter measuring system of a micro fan aiming at the defects in the prior art so as to solve the technical problems in the prior art.
In order to achieve the above purpose, the technical scheme adopted by the embodiment of the application is as follows:
In a first aspect, the embodiment of the application provides a system for measuring parameters of a vibration test and vibration reduction device of a micro fan, which comprises a supporting platform, the micro fan to be tested, the vibration reduction device and the vibration test system;
The miniature fan and the vibration reduction device are fixedly arranged on the supporting platform, an air outlet and an air inlet are arranged on the supporting platform, an air inlet pipe on the miniature fan extends into the air inlet, and an air outlet pipe on the miniature fan extends into the air outlet;
The micro fan is used for receiving a plurality of rotation instructions, executing rotation according to each rotation instruction and generating vibration in the rotation process;
the vibration testing system is used for collecting initial vibration signals at a plurality of preset measuring points when the micro fan vibrates, and determining vibration parameters of the micro fan according to the initial vibration signals;
The vibration damping device is used for performing vibration damping on the initial vibration signal generated when the micro fan vibrates;
The vibration test system is further used for obtaining a response signal after the vibration reduction device performs vibration reduction on the initial vibration signal, and determining vibration reduction parameters of the vibration reduction device according to the initial vibration signal and the response signal.
Optionally, there is a correlation between the plurality of measurement points, and the determining process of the correlation includes:
under a preset rotation instruction, the micro fan sends test laser beams to the plurality of measuring points, collects reflected test laser beams after the test laser beams are reflected by the measuring points, and determines vibration data on the measuring points according to the reflected test laser beams corresponding to the measuring points;
and (3) carrying out linear correlation calculation on vibration data on each measuring point by adopting a Pelson correlation coefficient algorithm to obtain the linear correlation of each measuring point.
Optionally, the vibration testing system comprises a laser vibration meter and a processing device;
The laser vibration meter is used for sending laser beams to the plurality of measuring points when the micro fan generates vibration, collecting reflected laser beams of the measuring points after reflecting the laser beams, determining the initial vibration signal according to the reflected laser beams, and sending the initial vibration signal to the processing device;
the processing device is used for preprocessing the initial vibration signal to obtain a preprocessed vibration signal, and determining the vibration parameters of the micro fan according to the preprocessed vibration signal.
Optionally, the preprocessing the initial vibration signal to obtain a preprocessed vibration signal, and determining the vibration parameter of the micro fan according to the preprocessed vibration signal, including:
Performing digital filtering and denoising treatment on the initial vibration signal to obtain a preprocessed vibration signal;
Performing time domain analysis on the preprocessed vibration signal to obtain the vibration amplitude and vibration waveform of the micro fan;
Carrying out frequency domain analysis on the preprocessed vibration signal to determine a spectrogram of the micro fan;
And taking the vibration amplitude, the vibration waveform and the spectrogram of the micro fan as the vibration parameters of the micro fan.
Optionally, the system further comprises a control device, wherein the control device is in communication connection with the control end of the micro fan;
the control device is used for generating the rotating speed instructions and respectively sending the rotating speed instructions to the micro fan.
Optionally, the system further comprises a rotation speed sensor, wherein the output end of the rotation speed sensor is connected with the input end of the processing device;
The rotating speed sensor is used for collecting the rotating speed of the micro fan during rotation and transmitting the rotating speed to the processing device;
The processing device is further configured to:
and determining whether the micro fan is in an abnormal state when vibrating according to the rotating speed and the vibration parameters of the micro fan.
Optionally, the system further comprises a first acquisition unit and a second acquisition unit, wherein the first acquisition unit is arranged at the bottom of the vibration reduction device, the second acquisition unit is arranged at the top of the vibration reduction device, and the output end of the first acquisition unit and the output end of the second acquisition unit are both in communication connection with the vibration test system;
The first acquisition unit is used for acquiring initial vibration signals generated by the micro fan under different excitation instructions and sending the initial vibration signals to the vibration test system;
The second acquisition unit is used for acquiring a response signal after the vibration reduction device performs vibration reduction on the initial vibration signal and sending the response signal to the vibration test module;
the vibration test system is specifically configured to determine a dynamic vibration reduction parameter of the vibration reduction device according to the initial vibration signal and the response signal.
Optionally, grooves with different bottom diameters are formed in the vibrating mass shaft of the vibration damper, and the rubber ring for vibration damping is arranged in the target groove.
Optionally, the determining the dynamic vibration damping parameter of the vibration damping device according to the initial vibration signal and the response signal includes:
Determining a difference parameter of the initial vibration signal and the response signal, wherein the difference parameter comprises an amplitude ratio and a phase difference;
and inputting the amplitude ratio and the phase difference into a pre-constructed dynamic model for calculation to obtain dynamic stiffness and dynamic damping parameters of the rubber ring in the vibration damper, and taking the dynamic stiffness and the dynamic damping parameters as the dynamic vibration damper parameters.
Optionally, the construction process of the dynamics model includes:
Acquiring the mass of a mass block in the vibration damper;
determining a displacement excitation acting on the mass and a displacement response of the mass;
and establishing the kinetic equation according to the mass, the displacement excitation and the displacement response.
The beneficial effects of the application are as follows:
The application provides a micro fan vibration test and vibration reduction device parameter measurement system, which comprises a support platform, a micro fan to be tested, a vibration reduction device and a vibration test system, wherein the micro fan and the vibration reduction device are fixedly arranged on the support platform, an air outlet and an air inlet are formed in the support platform, an air inlet pipe on the micro fan extends into the air inlet, an air outlet pipe on the micro fan extends into the air outlet, the micro fan is used for receiving a plurality of rotation instructions, executing rotation according to the rotation instructions and generating vibration in the rotation process, the vibration test system is used for collecting initial vibration signals at a plurality of preset measurement points when the micro fan vibrates and determining vibration parameters of the micro fan according to the initial vibration signals, the vibration reduction device is used for executing vibration reduction on the initial vibration signals generated when the micro fan vibrates, and the vibration test system is also used for obtaining response signals of the vibration reduction device after executing vibration reduction on the initial vibration signals and determining vibration reduction parameters of the vibration reduction device according to the initial vibration signals and the response signals. The application provides a comprehensive test platform which integrates the vibration test of a micro fan and the dynamic characteristic test function of a vibration damper, namely the test platform provided by the application has the advantage of high integration, meanwhile, the vibration test system is utilized to realize non-contact data acquisition, so that the contact interference of a sensor is avoided, the measurement precision is ensured, and the micro fan or an external vibration damper is utilized to generate an initial vibration signal, so that the vibration damper can simulate the vibration condition under the real working condition, and provide stable and controllable excitation signals for the dynamic test of the vibration damper, namely the test platform has a flexible vibration excitation mode, so that the combined dynamic parameter measurement of the micro fan and the vibration damper matched with the micro fan in the emergency transportation breathing machine under the real working condition is realized.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a system for measuring parameters of a vibration testing and damping device of a micro fan according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a system for measuring parameters of a vibration testing and damping device of a micro fan according to an embodiment of the present application;
FIG. 3 is a schematic diagram of another system for measuring parameters of a vibration testing and damping device of a micro fan according to an embodiment of the present application;
FIG. 4 is a schematic diagram of a system for measuring parameters of a vibration testing and damping device of a micro fan according to an embodiment of the present application;
FIG. 5 is a schematic diagram of another system for measuring parameters of a vibration testing and damping device of a micro fan according to an embodiment of the present application;
FIG. 6 is a schematic structural diagram of a vibration damping device according to an embodiment of the present application;
fig. 7 is a schematic structural diagram of another vibration damping device according to an embodiment of the present application.
The diagram comprises a 100-micro fan vibration test and vibration damper parameter measurement system, a 1-support platform, a 2-micro fan, a 3-vibration damper, a 4-vibration test system, a 41-laser vibration meter, a 42-processing device, a 5-control device, a 6-rotating speed sensor, a 7-temperature sensor, an 8-first acquisition unit, a 9-second acquisition unit, a 10-sampling module mounting point, an 11-mass shaft, a 12-support seat, a 13-mass adjustment port and a 14-groove.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application, and it should be understood that the drawings in the present application are for the purpose of illustration and description only and are not intended to limit the scope of the present application. In addition, it should be understood that the schematic drawings are not drawn to scale. A flowchart, as used in this disclosure, illustrates operations implemented according to some embodiments of the present application. It should be understood that the operations of the flow diagrams may be implemented out of order and that steps without logical context may be performed in reverse order or concurrently. Moreover, one or more other operations may be added to or removed from the flow diagrams by those skilled in the art under the direction of the present disclosure.
In addition, the described embodiments are only some, but not all, embodiments of the application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that the term "comprising" will be used in embodiments of the application to indicate the presence of the features stated hereafter, but not to exclude the addition of other features.
The vibration testing and vibration damping device parameter measuring system of the micro fan and the corresponding beneficial effects are described below through a plurality of specific embodiments.
Referring to FIG. 1, the system 100 for measuring parameters of vibration testing and vibration reducing device of micro-blower provided by the application comprises a supporting platform 1, a micro-blower 2 to be tested, a vibration reducing device 3 and a vibration testing system 4;
The support platform 1 comprises a support base and a support base, wherein an air inlet and an air outlet are reserved in the support base, no-load design is adopted, vibration signals generated when the micro fan 2 vibrates are prevented from being interfered by external pipelines, and the base is made of aluminum alloy and a rubber vibration isolation pad, so that the requirements of conventional and super working conditions are met, and a stable platform is provided for data acquisition.
The rotational speed of the micro-fan 2 may be flexibly set, and the rotational speed of the micro-fan 2 may range from 5000 to 60000rpm, for example. Optionally, when the micro fan 2 rotates, working parameters such as a rotation speed, a temperature and the like of the micro fan 2 can be monitored, so as to ensure stable operation of the micro fan 2 under a preset working condition.
Optionally, the application provides a comprehensive test platform, which can test the vibration parameters of the micro fan 2 and also can measure the dynamic parameters of the vibration damper 3.
Specifically, with continued reference to fig. 1, the micro fan 2 and the vibration damper 3 are fixedly installed on the support platform 1, the support platform 1 is provided with an air outlet and an air inlet, the air inlet pipe on the micro fan 2 extends into the air inlet, and the air outlet pipe on the micro fan 2 extends into the air outlet, wherein in order to ensure the accuracy of the test result, the micro fan 2 and the vibration damper 3 are required to be fixedly installed on the support platform 1, so that the situation that the test result is deviated due to unstable installation is avoided. The fixed connection may include, for example, bolting, welding, snap-fitting, flange connection, etc., without specific limitation.
The micro fan 2 is configured to receive a plurality of rotation instructions, execute rotation according to each rotation instruction, and generate vibration in the rotation process, where the rotation speeds corresponding to different rotation instructions are different, and an example is that the rotation speed corresponding to the rotation instruction 1 is 50000rpm, and the rotation speed corresponding to the rotation instruction 2 is 60000rpm. Therefore, in the present embodiment, in order to ensure the accuracy of the vibration test result, the micro fan 2 may be controlled to perform rotation under a plurality of rotation instructions, and a vibration signal generated when the rotation is performed under each rotation speed instruction may be acquired.
And the vibration testing system 4 is used for collecting initial vibration signals at a plurality of preset measurement points when the micro fan 2 vibrates, and determining vibration parameters of the micro fan 2 according to the initial vibration signals.
Optionally, in order to ensure the accuracy of the vibration test result, a plurality of measurement points, such as 18 measurement points, can be arranged on the support base, the outer surface of the micro fan 2 and the shell of the vibration damper 3, so as to support the multi-point and multi-dimensional data acquisition on the X, Y, Z shaft and ensure the comprehensive and repeated verification of the vibration signal.
For example, when the micro fan 2 performs rotation under the rotation command 1 and generates vibration, the vibration test system 4 may collect initial vibration signals of the micro fan 2 at a plurality of preset measurement points, and calculate vibration parameters of the micro fan 2, such as a vibration speed, a vibration amplitude, a vibration intensity, a vibration frequency, and the like, based on the initial vibration signals.
A vibration damping means 3 for performing vibration damping of an initial vibration signal generated when the micro fan 2 vibrates;
the vibration testing system 4 is further configured to obtain a response signal after the vibration damping device 3 performs vibration damping on the initial vibration signal, and determine a vibration damping parameter of the vibration damping device 3 according to the initial vibration signal and the response signal.
The response signal is a signal after the initial vibration signal is damped, that is, the amplitude intensity of the response signal is smaller than the amplitude intensity of the initial vibration signal.
In this embodiment, the vibration damping parameter of the vibration damping device 3 may also be measured while the micro fan 2 vibrates. Specifically, when the micro fan 2 vibrates, the vibration damping device 3 performs vibration damping on an initial vibration signal generated when the micro fan 2 vibrates, the vibration test system 4 obtains a response signal after the vibration damping device 3 performs vibration damping on the initial vibration signal, and vibration damping parameters, such as rigidity, elastic parameters, damping coefficients and the like, of the vibration damping device 3 are calculated based on the initial vibration signal and the response signal.
Optionally, the vibration testing and vibration damping device parameter measuring system 100 of the micro fan provided by the application is a comprehensive testing platform, not only can realize high-precision and non-contact measurement of the vibration state of the micro fan 2, but also can integrate the vibration damping device 3 with dynamic characteristics, and measure the dynamic parameters of the vibration damping device 3 for the micro fan 2 to form a unified testing and analyzing system, so as to provide reliable data support for fault diagnosis, performance optimization and research and development of the vibration damping device 3 of the micro fan 2, namely, the integrated level of the testing system provided by the application is high, so that the vibration characteristic of the micro fan 2 can be monitored in real time and accurately, and the dynamic parameters of the O-shaped rubber ring for vibration damping can be tested, thereby meeting the actual application requirements.
In summary, the application provides a system for testing vibration of a micro fan and measuring parameters of a vibration damper, which comprises a supporting platform, the micro fan to be tested, the vibration damper and a vibration testing system, wherein the micro fan and the vibration damper are fixedly arranged on the supporting platform, an air outlet and an air inlet are formed in the supporting platform, an air inlet pipe on the micro fan extends into the air inlet, an air outlet pipe on the micro fan extends into the air outlet, the micro fan is used for receiving a plurality of rotation instructions, executing rotation according to the rotation instructions and generating vibration in the rotation process, the vibration testing system is used for acquiring initial vibration signals at a plurality of preset measuring points when the micro fan vibrates and determining vibration parameters of the micro fan according to the initial vibration signals, the vibration damper is used for executing vibration damping on the initial vibration signals generated when the micro fan vibrates, and the vibration testing system is also used for acquiring response signals after the vibration damper executes vibration damping on the initial vibration signals and determining the vibration damping parameters of the vibration damper according to the initial vibration signals and the response signals. The application provides a comprehensive test platform which integrates the vibration test of a micro fan and the dynamic characteristic test function of a vibration damper, namely the test platform provided by the application has the advantage of high integration, meanwhile, the vibration test system is utilized to realize non-contact data acquisition, so that the contact interference of a sensor is avoided, the measurement precision is ensured, and the micro fan or an external vibration damper is utilized to generate an initial vibration signal (also called as simple harmonic excitation) so as to simulate the excitation condition under the real working condition, thereby providing stable and controllable excitation signals for the dynamic test of the vibration damper, namely a flexible excitation mode is provided, and the combined dynamic parameter measurement of the micro fan and the vibration damper matched with the micro fan in the emergency transportation breathing machine under the real working condition is realized.
The platform has the advantages of high data consistency, multi-point full-dimensional measurement, flexible excitation control and the like, and provides reliable test basis for fan fault diagnosis, performance optimization and vibration reduction design.
Optionally, there is a correlation between the plurality of measurement points, and the determining process of the correlation includes:
under a preset rotation instruction, the micro fan 2 sends test laser beams to the plurality of measuring points, collects reflected test laser beams after the measuring points reflect the test laser beams, and determines vibration data on the measuring points according to the reflected test laser beams corresponding to the measuring points;
and (3) carrying out linear correlation calculation on vibration data on each measuring point by adopting a Pelson correlation coefficient algorithm to obtain the linear correlation of each measuring point.
Optionally, in order to ensure consistency and reliability of vibration data of each measurement point, consistency verification of vibration data on each measurement point is also required. The method comprises the following steps:
1. Under the same rotation instruction of the micro fan 2, namely under the same rotation speed of the micro fan 2, vibration data (x i,yi) on each measuring point are collected;
2. The pearson correlation coefficient algorithm may be used to calculate the linear correlation between the measurement points, specifically as shown in the following formula (1):
And (3) quantifying the linear correlation of each measuring point by carrying out normalization processing and cross correlation analysis on signal data among different measuring points, judging the response consistency of the whole system, and finally intuitively displaying the correlation among the measuring points in a heat map form.
Optionally, for vibration data collected by the same measuring point in multiple start-stop tests, a weighted average method can be adopted to comprehensively process the data so as to reduce the influence of sporadic errors on overall judgment. And when the frequency domain features are extracted, the standard deviation and the variation coefficient can be calculated after the same frequency component is sampled for a plurality of times and used as evaluation indexes of data stability and consistency. Therefore, the vibration data collected under different working conditions can be ensured to have high repeatability, and the actual vibration state can be reflected better, so that a reliable basis is provided for subsequent dynamic parameter calculation.
Optionally, for the measured data of the vibration damper under the conditions of multiple start and stop and different rotating speeds, the consistency of the data is verified through time-frequency domain analysis and correlation coefficient calculation. The test result shows that the correlation of each measuring point exceeds 99% under the low excitation condition, and the correlation still keeps above 70% under the high excitation condition, so that the platform has good data repeatability and stability.
The specific structure and operation of the vibration testing system will be explained in detail by the following examples.
Optionally, referring to FIG. 2, the vibration testing system 4 includes a laser vibrometer 41 and a processing device 42;
The laser vibration meter 41 is configured to, when the micro fan 2 generates vibration, emit laser beams to a plurality of measurement points, collect reflected laser beams reflected by the laser beams at the measurement points, determine an initial vibration signal according to the reflected laser beams, and send the initial vibration signal to the processing device 42;
in this embodiment, in order to perform high-precision and non-contact measurement on the vibration state of the micro fan 2, it is proposed that the laser vibration meter 41 can be used to emit laser to each measuring point and receive reflected light of each measuring point, so as to realize non-contact data acquisition, avoid contact interference of the sensor and ensure measurement precision.
Optionally, in order to ensure that the laser reflectivity of each measuring point is more than 95%, a reflection patch can be attached to each measuring point, so as to collect vibration signals of the micro fan 2 at multiple points in three directions X, Y, Z.
The processing device 42 is configured to pre-process the initial vibration signal to obtain a pre-processed vibration signal, and determine a vibration parameter of the micro fan 2 according to the pre-processed vibration signal.
In this embodiment, when the micro fan 2 performs rotation under the rotation instruction 1 and generates vibration, the laser vibration meter 41 emits laser beams to a plurality of measuring points, receives reflected laser beams reflected by the laser beams at each measuring point, and performs photoelectric conversion on the reflected laser beams to obtain an initial vibration signal of the micro fan 2, and sends the initial vibration signal to the processing device 42, and the processing device 42 performs preprocessing, such as filtering, on the initial vibration signal to obtain a preprocessed vibration signal, and performs analysis processing on the preprocessed vibration signal to obtain vibration amplitude, vibration intensity, and the like of the micro fan 2.
Optionally, the initial vibration signal is preprocessed to obtain a preprocessed vibration signal, and the vibration parameter of the micro fan 2 is determined according to the preprocessed vibration signal, including:
Performing digital filtering and denoising treatment on the initial vibration signal to obtain a preprocessed vibration signal;
Performing time domain analysis on the preprocessed vibration signals to obtain vibration amplitude and vibration waveform of the micro fan 2;
carrying out frequency domain analysis on the preprocessed vibration signals to determine a spectrogram of the micro fan 2;
and taking the vibration amplitude, the vibration waveform and the spectrogram of the micro fan 2 as the vibration parameters of the micro fan 2.
In one implementation manner, in order to ensure the accuracy of the processing result, the acquired initial vibration signal may be subjected to digital filtering processing, such as low-pass filtering and band-pass filtering by using a kalman filter, and denoising processing is performed on the filtered signal to obtain a preprocessed vibration signal, so that the subsequent analysis processing can be performed based on the high-quality signal, and meanwhile, normalization processing can be performed on the preprocessed vibration signal, so that comparison between multi-measurement-point data is facilitated;
And (3) performing time domain analysis on the preprocessed vibration signals, for example, calculating statistical characteristics such as mean value, standard deviation, peak-to-peak value, kurtosis, effective value (RMS), peak factor and the like of the preprocessed vibration signals to obtain the vibration amplitude and vibration waveform of the micro fan 2. The vibration amplitude refers to the up-and-down fluctuation of the micro fan 2 during vibration, and the vibration waveform refers to the fluctuation form of the micro fan 2 during vibration, namely the vibration state of the micro fan 2 can be quantitatively described by the vibration amplitude and the vibration waveform.
And frequency domain analysis, namely performing frequency domain analysis on the preprocessed vibration signal, such as converting the preprocessed vibration signal from a time domain to a frequency domain by utilizing a Fast Fourier Transform (FFT) algorithm, obtaining a frequency domain signal corresponding to the preprocessed vibration signal, extracting frequency spectrum information such as main frequency, harmonic components, power spectral density and the like from the frequency domain signal, determining a spectrogram when the micro fan 2 vibrates based on the frequency spectrum information, and judging resonance and vibration abnormal conditions from the spectrogram.
Optionally, a time domain waveform can be generated based on the obtained vibration amplitude and vibration waveform, and the time domain waveform and the spectrogram are displayed on a graphical user interface to visually display the vibration state.
Optionally, referring to FIG. 3, the system further comprises a control device 5, wherein the control device 5 is in communication connection with the control end of the micro fan 2;
The control device 5 is configured to generate a plurality of rotation speed instructions, and send each rotation speed instruction to the micro fan 2. For example, the control device may be an upper computer having a data processing function.
In one implementation manner, a plurality of rotation speed instructions generated in advance may be pre-stored in the control device, and the control device may sequentially issue each rotation speed instruction to the micro fan 2 according to a storage sequence of each rotation speed instruction, so that the permanent magnet synchronous motor in the micro fan 2 drives the impeller in the micro fan 2 to rotate under the action of each rotation speed instruction, and generate vibration in the rotation process.
Optionally, referring to FIG. 4, the vibration testing and damping device parameter measuring system 100 of the micro-fan further comprises a rotation speed sensor 6, wherein an output end of the rotation speed sensor 6 is connected with an input end of the processing device 42;
The rotation speed sensor 6 is used for collecting the rotation speed of the micro fan 2 during rotation and transmitting the rotation speed to the processing device 42;
the processing device 42 is further configured to:
and determining whether the micro fan 2 is in an abnormal state when vibrating according to the rotating speed and the vibration parameters of the micro fan 2.
In this embodiment, in order to determine the state of the micro fan during rotation, it is proposed that the rotation speed of the micro fan and the vibration parameter of the micro fan may be combined to determine whether the micro fan is in a normal state or has an abnormality during vibration. Specifically, the rotation speed n of the micro fan 2 may be substituted into a pre-constructed fundamental frequency equation, for example fr=n/60, to calculate the theoretical fundamental frequency of the micro fan 2, where fr is the fundamental frequency and n is the rotation speed of the micro fan 2, and then the fundamental frequency fr is compared with actual frequency spectrum data in vibration parameters of the micro fan 2, so as to identify and obtain fundamental frequency, harmonic component and possible abnormal frequency band, and compare the fundamental frequency, harmonic component and possible abnormal frequency band with a preset threshold, so as to determine whether the fan vibrates in an abnormal state.
Optionally, the micro fan vibration device also comprises a temperature sensor 7, namely, the micro fan vibration device can also judge whether the micro fan 2 is in an abnormal state or not when in vibration according to the rotating speed and the temperature information of the micro fan 2 when in rotation and the vibration parameters of the micro fan 2.
Optionally, referring to FIG. 5, the vibration testing and damping device parameter measuring system 100 of the micro fan further comprises a first collecting unit 8 and a second collecting unit 9;
The first acquisition unit 8 and the second acquisition unit 9 may be, for example, laser vibrometers or triaxial acceleration sensors. The method can synchronously acquire an initial vibration signal and a response signal after vibration reduction through a laser vibration meter or a triaxial acceleration sensor, wherein the measurement of the vibration signal is realized by using the laser vibration meter, and only laser reflection sheets are attached to two measuring points to reflect laser to the two laser vibration meters.
The first acquisition unit 8 is arranged at the bottom of the vibration damper 3, the second acquisition unit 9 is arranged at the top of the vibration damper 3, and the output end of the first acquisition unit 8 and the output end of the second acquisition unit 9 are in communication connection with the vibration test system 4;
the first collecting unit 8 is used for collecting initial vibration signals generated by the micro fan 2 under different excitation instructions and sending the initial vibration signals to the vibration testing system 4, wherein the rotation speeds and the balance amounts corresponding to the different excitation instructions are different. Wherein, the initial vibration signals generated under different excitation instructions are different.
In this embodiment, the principle of mechanical inertial type or centrifugal vibration exciter is adopted, and the rotation speed and unbalance amount of the micro fan 2 are adjusted, so that the micro fan 2 can be used as a self-vibration test object and also can be used as a vibration source to provide periodic excitation for the vibration damper 3, that is, the vibration test of the micro fan 2 and the vibration damper 3 are integrally built, and the initial vibration signal is ensured to meet the test requirement. Or if necessary, a mechanical inertial exciter is added to provide a more flexible excitation pattern for the vibration damping device 3.
The second acquisition unit 9 is configured to acquire a response signal after the vibration damping device 3 damps the initial vibration signal, and send the response signal to the vibration test module, that is, acquire the signal after the vibration damping device 3 damps the vibration through the second acquisition unit 9.
The vibration testing system 4 is specifically configured to determine a dynamic vibration damping parameter of the vibration damping device 3 according to the initial vibration signal and the response signal.
In one implementation manner, the initial vibration signal and the response signal may be compared, for example, the amplitude difference and the frequency ratio are calculated, and the amplitude difference and the frequency ratio are used as dynamic vibration damping parameters of the vibration damping device 3, so as to realize quantitative description of the vibration damping effect of the vibration damping device 3.
Optionally, grooves with different bottom diameters are formed on the vibrating mass shaft of the vibration damper 3, and rubber rings for vibration damping are arranged in the target grooves.
Referring to fig. 6 or 7, the vibration damper 3 adopts a shaft-shaped vibration mass and a pre-designed groove structure, wherein an O-shaped rubber ring for vibration damping is installed, and in order to realize dynamic parameter test of the O-shaped rubber ring in the vibration damper 3 under different compression amounts, the installation mode comprises the following two schemes:
According to the scheme I, referring to FIG. 6, a groove is formed in a vibrating mass shaft, and the compression amount of an O-shaped rubber ring is adjusted by changing the bottom diameter of the groove, for example, 10% -30% of the compression amount is designed;
In a second scheme, referring to fig. 7, a groove is designed in the supporting seat, and the compression amount of the O-shaped rubber ring is controlled by changing the size of the groove.
The two schemes can realize the testing of parameters such as dynamic stiffness, dynamic damping and the like of the O-shaped rubber ring under simple harmonic excitation. Specifically, under the excitation action, a laser vibration meter or a triaxial acceleration sensor is arranged on the vibration damper 3, an initial vibration signal and a response signal after vibration reduction are synchronously collected, the dynamic stiffness and dynamic damping parameters of the O-shaped rubber ring are obtained by using the amplitude ratio and the phase difference of the initial vibration signal and the response signal after vibration reduction, a system dynamics model is built, and the performance of the vibration damper 3 is quantitatively evaluated.
Fig. 6 and 7 are front view and cross-sectional view of the vibration damper 3 in the present embodiment, and the vibration damper 3 includes a sampling module mounting point 10, a mass shaft 11, a supporting seat 12, a mass adjusting port 13, and a groove 14.
In the scheme, the vibration damper 3 adopts a shaft-shaped mass block and combines groove structures with different sizes to install the O-shaped rubber ring in an adjustable mode, so that vibration characteristic test under different compression conditions is realized. The vibration damper 3 can be combined with a plane excitation mode to meet the test requirement of a forced non-resonance method and ensure accurate measurement of dynamic parameters.
In order to meet the theoretical requirements of a forced resonance method and simultaneously ensure that vibration interference in an unexpected direction is reduced in the testing process so as to improve the testing precision, a mass shaft 11 with a shaft-shaped structure is adopted, an installation matching mode is optimized, and the center of gravity of the mass shaft 11 is moved downwards in a mode of locally milling the surface of the middle part of the mass shaft, so that the vibration stability of a system is improved, and the first acquisition unit and the second acquisition unit are conveniently fixed and installed. The mass shaft 11 is also provided with a mass adjustment port 13 for adding additional mass to achieve flexible adjustment of the vibration mass.
The grooves 14 are used for installing vibration-damping O-shaped rubber rings, and the sizes of the grooves are different, so that the compression amounts of the grooves with different structures are also different. Therefore, the O-shaped rubber ring can be installed in grooves with different sizes, and vibration characteristics under different compression conditions can be tested.
In order to realize the accurate control of the compression amount of the rubber ring, the following two optional structural schemes can be adopted:
(1) As shown in FIG. 6, the shaft type groove design is that symmetrical grooves with consistent dimensions are processed at two ends of the mass shaft 11 for installing O-shaped rubber rings, and the supporting seat 12 is ensured to be consistent all the time under different test conditions, so that the influence of the deflection of the supporting seat 12 on experimental data is reduced. By adjusting the structural dimensions of the recess 14, precise regulation and control of different preset compression amounts can be achieved.
(2) As shown in fig. 7, the support seat type groove is designed such that a groove is formed in the inside of the support seat 12 to form an installation cavity of the O-shaped rubber ring, and the precompression amount of the rubber ring is controlled by adjusting the inner size of the support seat 12. In order to improve assembly convenience and manufacturing accuracy, the supporting seat adopts an upper-lower split type structure, and is convenient to assemble, disassemble and experimentally adjust.
The dynamic characteristic test of the O-shaped rubber ring under different compression conditions can be realized by the two structural schemes, and the reliability, the measurement accuracy and the repeatability of a test system can be ensured by accurately regulating and controlling the machining accuracy, optimizing the assembly mode and improving the experimental stability. The selection of the final scheme can be optimized by balancing factors such as manufacturing cost, machining precision, experimental adaptability and the like according to specific application requirements.
Optionally, determining the dynamic vibration damping parameter of the vibration damping device 3 according to the initial vibration signal and the response signal includes:
And determining a difference parameter of the initial vibration signal and the response signal, wherein the difference parameter comprises an amplitude ratio and a phase difference, and the difference parameter is the vibration reduction degree of the vibration reduction device 3 on the initial vibration signal.
The amplitude ratio and the phase difference are input into a pre-constructed dynamic model for calculation, so that the dynamic stiffness and the dynamic damping parameters of the rubber ring in the vibration damper 3 are obtained, and the dynamic stiffness and the dynamic damping parameters are used as dynamic vibration damping parameters.
Wherein, the rubber ring dynamic model can be constructed according to the super elasticity, viscoelasticity, geometric nonlinearity, contact behavior and the like of the rubber ring. For example, a dynamic model of the rubber ring, such as the Mooney-Rivlin model, may be constructed based on the superelastic properties of the rubber.
In the embodiment, if the initial vibration signal and the response signal can be compared to obtain the difference parameters, the difference parameters comprise amplitude ratio and phase difference, the amplitude ratio and the phase difference are input into a dynamic model for calculation to obtain dynamic stiffness and dynamic damping parameters of the rubber ring in the vibration damper 3, and the dynamic stiffness and the dynamic damping parameters are used as dynamic vibration damping parameters to realize quantitative evaluation of vibration damping performance of the rubber ring in the vibration damper 3.
In the embodiment, in the actual test, the response test of the vibration damper 3 under different excitation frequencies can be realized by adjusting the excitation parameters (rotation speed and unbalance amount) of the micro fan 2, the dynamic parameters of the O-shaped rubber ring are calculated by utilizing the algorithm, and finally, a frequency response curve of the system is constructed, so that a theoretical basis is provided for the optimal design of the vibration damper 3.
The process of constructing the kinetic model will be specifically explained by the following examples.
Optionally, the process of constructing the kinetic model includes:
acquiring the mass of the mass block in the vibration damper 3;
determining a displacement excitation acting on the mass and a displacement response of the mass;
and establishing a kinetic equation according to the mass, displacement excitation and displacement response.
In this embodiment, the Kelvin-Voigt model has unique advantages under dynamic environment in consideration of comparison with other viscoelastic models, and is particularly suitable for behavior description of an O-type rubber ring when loaded in a short time, and has the advantage of being capable of reflecting instantaneous elastic deformation and viscous damping with time simultaneously.
The first step, according to the forced non-resonance method, a kinetic equation is established, specifically as shown in the following formula (2):
Where m is the mass of the mass, x 1 is the displacement response of the mass, x 0 is the sinusoidal displacement excitation acting on the mass, where k (ω) and c (ω) are the equivalent stiffness and equivalent damping of the rubber ring.
Second, assuming that the response x 1 of excitation x 0 to mass m can be expressed as follows formulas (3) - (4):
wherein a 0 is the simple harmonic displacement excitation amplitude, ω is the excitation angular frequency, Is the initial phase of simple harmonic displacement excitation.
Wherein a 1 is the displacement response amplitude of the vibration mass m,In response to x 1 being late with the phase of the simple harmonic excitation x 0.
The displacement response x 1 of the mass block and the displacement excitation x 0 acting on the mass block are brought into a dynamic equation to obtain dynamic stiffness and dynamic damping expressed by using an amplitude ratio and a phase difference, and the dynamic stiffness and the dynamic damping are specifically expressed by the following formulas (5) - (6):
where α (ω) =a 1/a0 is the ratio of the simple harmonic response to the displacement excitation amplitude.
In the several embodiments provided by the present invention, it should be understood that the disclosed apparatus and method may be implemented in other manners. For example, the apparatus embodiments described above are merely illustrative, e.g., the division of the units is merely a logical function division, and there may be additional divisions when actually implemented, e.g., multiple units or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be an indirect coupling or communication connection via some interfaces, devices or units, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in hardware plus software functional units.
The integrated units implemented in the form of software functional units described above may be stored in a computer readable storage medium. The software functional unit is stored in a storage medium, and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (english: processor) to perform some of the steps of the methods according to the embodiments of the invention. The storage medium includes various media capable of storing program codes, such as a U disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk or an optical disk.
Claims (10)
1. The system for measuring the parameters of the vibration test and vibration reduction device of the micro fan is characterized by comprising a supporting platform, the micro fan to be tested, the vibration reduction device and the vibration test system;
The miniature fan and the vibration reduction device are fixedly arranged on the supporting platform, an air outlet and an air inlet are arranged on the supporting platform, an air inlet pipe on the miniature fan extends into the air inlet, and an air outlet pipe on the miniature fan extends into the air outlet;
The micro fan is used for receiving a plurality of rotation instructions, executing rotation according to each rotation instruction and generating vibration in the rotation process;
the vibration testing system is used for collecting initial vibration signals at a plurality of preset measuring points when the micro fan vibrates, and determining vibration parameters of the micro fan according to the initial vibration signals;
The vibration damping device is used for performing vibration damping on the initial vibration signal generated when the micro fan vibrates;
The vibration test system is further used for obtaining a response signal after the vibration reduction device performs vibration reduction on the initial vibration signal, and determining vibration reduction parameters of the vibration reduction device according to the initial vibration signal and the response signal.
2. The system of claim 1, wherein there is a correlation between the plurality of measurement points, and wherein the determining of the correlation comprises:
under a preset rotation instruction, the micro fan sends test laser beams to the plurality of measuring points, collects reflected test laser beams after the test laser beams are reflected by the measuring points, and determines vibration data on the measuring points according to the reflected test laser beams corresponding to the measuring points;
and (3) carrying out linear correlation calculation on vibration data on each measuring point by adopting a Pelson correlation coefficient algorithm to obtain the linear correlation of each measuring point.
3. The system of claim 1, wherein the vibration testing system comprises a laser vibrometer and a processing device;
the laser vibration meter is used for sending laser beams to a plurality of measuring points when the micro fan generates vibration, collecting reflected laser beams of the measuring points after reflecting the laser beams, determining the initial vibration signal according to the reflected laser beams, and sending the initial vibration signal to the processing device;
the processing device is used for preprocessing the initial vibration signal to obtain a preprocessed vibration signal, and determining the vibration parameters of the micro fan according to the preprocessed vibration signal.
4. The system of claim 3, wherein the preprocessing the initial vibration signal to obtain a preprocessed vibration signal, and determining the vibration parameter of the micro-fan according to the preprocessed vibration signal comprises:
Performing digital filtering and denoising treatment on the initial vibration signal to obtain a preprocessed vibration signal;
Performing time domain analysis on the preprocessed vibration signal to obtain the vibration amplitude and vibration waveform of the micro fan;
Carrying out frequency domain analysis on the preprocessed vibration signal to determine a spectrogram of the micro fan;
And taking the vibration amplitude, the vibration waveform and the spectrogram of the micro fan as the vibration parameters of the micro fan.
5. The system of claim 1, wherein the system for measuring the vibration testing and damping device parameters of the micro-fan further comprises a control device, wherein the control device is in communication connection with a control end of the micro-fan;
the control device is used for generating the rotating speed instructions and respectively sending the rotating speed instructions to the micro fan.
6. The system of claim 3, wherein the system for testing vibration of the micro-fan and measuring parameters of the vibration reduction device further comprises a rotation speed sensor, wherein the output end of the rotation speed sensor is connected with the input end of the processing device;
The rotating speed sensor is used for collecting the rotating speed of the micro fan during rotation and transmitting the rotating speed to the processing device;
The processing device is further configured to:
and determining whether the micro fan is in an abnormal state when vibrating according to the rotating speed and the vibration parameters of the micro fan.
7. The system of claim 1, wherein the system for measuring parameters of the vibration testing and vibration reducing device of the micro fan further comprises a first acquisition unit and a second acquisition unit, wherein the first acquisition unit is arranged at the bottom of the vibration reducing device, the second acquisition unit is arranged at the top of the vibration reducing device, and the output end of the first acquisition unit and the output end of the second acquisition unit are in communication connection with the vibration testing system;
The first acquisition unit is used for acquiring initial vibration signals generated by the micro fan under different excitation instructions and sending the initial vibration signals to the vibration test system;
The second acquisition unit is used for acquiring a response signal after the vibration reduction device performs vibration reduction on the initial vibration signal and sending the response signal to the vibration test module;
the vibration test system is specifically configured to determine a dynamic vibration reduction parameter of the vibration reduction device according to the initial vibration signal and the response signal.
8. The system of claim 7, wherein grooves with different bottom diameters are formed on the vibration mass shaft of the vibration damper, and rubber rings for vibration damping are arranged in the target grooves.
9. The system of claim 8, wherein said determining a dynamic vibration reduction parameter of said vibration reduction apparatus based on said initial vibration signal and said response signal comprises:
Determining a difference parameter of the initial vibration signal and the response signal, wherein the difference parameter comprises an amplitude ratio and a phase difference;
and inputting the amplitude ratio and the phase difference into a pre-constructed dynamic model for calculation to obtain dynamic stiffness and dynamic damping parameters of the rubber ring in the vibration damper, and taking the dynamic stiffness and the dynamic damping parameters as the dynamic vibration damper parameters.
10. The system of claim 9, wherein the process of constructing the kinetic model comprises:
Acquiring the mass of a mass block in the vibration damper;
determining a displacement excitation acting on the mass and a displacement response of the mass;
and establishing the kinetic equation according to the mass, the displacement excitation and the displacement response.
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