CN106352821B - A kind of rope capacity measurement method and device based on low-frequency ultrasonic waves - Google Patents
A kind of rope capacity measurement method and device based on low-frequency ultrasonic waves Download PDFInfo
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- CN106352821B CN106352821B CN201610726190.4A CN201610726190A CN106352821B CN 106352821 B CN106352821 B CN 106352821B CN 201610726190 A CN201610726190 A CN 201610726190A CN 106352821 B CN106352821 B CN 106352821B
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01B—MEASURING LENGTH, THICKNESS OR SIMILAR LINEAR DIMENSIONS; MEASURING ANGLES; MEASURING AREAS; MEASURING IRREGULARITIES OF SURFACES OR CONTOURS
- G01B17/00—Measuring arrangements characterised by the use of infrasonic, sonic or ultrasonic vibrations
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Abstract
The present invention discloses a kind of rope capacity measurement method and device based on low-frequency ultrasonic waves, and this method comprises the following steps: S101, obtaining low-frequency ultrasonic waves pulse translation sequence in wirerope；S102, the wave that exceeded the speed limit according to low frequency the pulse translation sequence and length of steel rope angle value between corresponding relationship, calculate the measurement length of wirerope, and calibration measurement result is sampled based on full-length.The low-frequency ultrasonic waves that the present invention is obtained according to sampling pulse translation sequence in wirerope calculates the measurement length of wirerope, accuracy is high, reliable and stable and practical according to the corresponding relationship between low frequency hypervelocity pulse sequence and length of steel rope angle value；Meanwhile full-length sampling situations are carried out according to type wirerope to be measured, Practical Project rope capacity measurement is compensated and corrected, it can computational accuracy and accuracy in further boom hoist cable linear measure longimetry.
Description
Technical field
The present invention relates to engineering equipment status monitoring field more particularly to a kind of rope capacities based on low-frequency ultrasonic waves
Measurement method and device.
Background technique
Currently, wirerope application amount in engineer equipment is huge, it is mainly used for the promotion operation of weight, due to wirerope
The flexibility characteristics pulley that can detour changes direction, so wirerope can be realized the drawing of the multiple directions such as vertical, horizontal, because
This, is widely used in the fields such as aerial lift device, ocean exploration operation, pit mining transport.But the prior art can not be to steel wire
Rope length is effectively measured, and the difficulty in measurement is mainly derived from following aspects: one, flexible wire ropes are around pulley
Work, leading to measurement is not simple line measurement；Two, flexible wire ropes will appear flexible deformation under different pulling force effects,
There are certain non-linear relations for deflection and drawing force and itself natural length and structure；Three, load cable is usual
Length is long, and transport and use need reel to wind.The effective operation length of current many requirement of engineering measuring steel wire ropes, such as eminence
In facade work progress, equipment uses, leases the departments such as room and supervision to the operation height ten of hanging basket basket of work
Divide and is concerned about, meanwhile, the distance of Coal Transport is also required in pit mining to be monitored measurement, in addition in other wirerope applications
Occasion also has eager demand to rope capacity measurement and cannot achieve, while realizing the digitized measurement of steel wire active length
Internet of Things can be helped to realize the remote monitoring of signal.
Summary of the invention
It is an object of the invention to by a kind of rope capacity measurement method and device based on low-frequency ultrasonic waves, to solve
The problem of certainly background section above is mentioned.
To achieve this purpose, the present invention adopts the following technical scheme:
A kind of rope capacity measurement method based on low-frequency ultrasonic waves comprising following steps:
S101, low-frequency ultrasonic waves pulse translation sequence in wirerope is obtained；
S102, according to low frequency exceed the speed limit wave the pulse translation sequence and length of steel rope angle value between corresponding relationship, calculate
The measurement length of wirerope out, and calibration measurement result is sampled based on full-length.
Particularly, the step S101 further include: ultrasonic to control single mode by adjusting the frequency of low-frequency ultrasonic waves
Transmission intensity and propagation distance of the wave in wirerope, the pulse that measurement low-frequency ultrasonic waves are propagated in wirerope to be measured, pass through
Tranmitting frequency is adjusted to calculate propagation time of the low-frequency ultrasonic waves in wirerope to be measured, is measured frequently according in such shaped steel wire rope
The spread speed of rate ultrasonic wave calculates the length of wirerope to be measured.
Particularly, occur and receive ultrasonic wave, low pass filtered in the step S101 using closely knit contact PZT (piezoelectric transducer)
Wave device controls ultrasonic frequency to realize transmission intensity and propagation distance of the low-frequency ultrasonic waves in wirerope, and emits and be used to know
The low-frequency ultrasonic waves of the different frequency of other ultrasonic signal.
Particularly, sample calibration measurement as a result, specifically including based on full-length in the step S102: selection standard is long
The passing time measurement that wirerope to be measured carries out low-frequency ultrasonic waves difference measurement frequency is spent, and specific according to the acquisition of the length of selection
Spread speed of the frequency low-frequency ultrasonic waves in wirerope to be measured calculates and corrects the length of measuring steel wire rope.
Particularly, the step S102 further include: emitted using different frequency low-frequency ultrasonic waves, measurement obtained
Data are estimated to carry out similarity differentiation using data statistics Plays difference, and are extracted single mode using Hilbert transform
Measurement result bring shadow is given in low frequency ultrasound wave pulse signal, the loss that generation is transmitted to eliminate low-frequency ultrasonic waves in wirerope
It rings, and effective passing time of the low-frequency ultrasonic waves in wirerope to be measured is provided based on time counting circuit, for the steel wire that converts
The physical length of rope.
Particularly, the contact position of the closely knit contact PZT (piezoelectric transducer) and wirerope steel wire to be measured is arranged to and steel
The similar groove structure of cord, while cooperating diameter that can be adjusted according to wirerope diameter to realize that closely knit contact piezoelectricity changes
It can device and wirerope full contact.
The rope capacity measuring device based on low-frequency ultrasonic waves that the invention also discloses a kind of comprising low-frequency ultrasonic waves
Transmitting terminal, low-frequency ultrasonic waves receiving end, micro-control unit (MCU), oscillatory excitation circuit, time reference circuit, power amplification electricity
Road, signal amplification circuit, temperature measuring circuit, data correction circuit, display terminal；The low-frequency ultrasonic waves transmitting terminal installation is used
In the closely knit contact PZT (piezoelectric transducer) of transmitting low-frequency ultrasonic waves；The low-frequency ultrasonic waves receiving end installation is super for receiving low frequency
The closely knit contact PZT (piezoelectric transducer) of sound wave；The micro-control unit, oscillatory excitation circuit, time reference circuit, power amplification
Circuit is sequentially connected；The closely knit contact piezoelectric energy-conversion of the output end connection low-frequency ultrasonic waves transmitting terminal of the power amplification circuit
Device；The input terminal of the low-frequency ultrasonic waves receiving end connection signal amplifying circuit, the output end connection of the signal amplification circuit
Micro-control unit；The micro-control unit connects temperature measuring circuit, display terminal；The display terminal connection data correction electricity
Road.
Rope capacity measurement method and device proposed by the present invention based on low-frequency ultrasonic waves obtains low according to sampling
Frequency ultrasonic pulse translation sequence in wirerope, being exceeded the speed limit according to low frequency, pulse sequence is corresponding between length of steel rope angle value to close
System calculates the measurement length of wirerope, and accuracy is high, reliable and stable and practical；Meanwhile according to type wirerope to be measured
It carries out full-length sampling situations Practical Project rope capacity measurement is compensated and corrected, it can further boom hoist cable
Computational accuracy and accuracy in linear measure longimetry.
Detailed description of the invention
Fig. 1 is the rope capacity measuring method flow chart provided in an embodiment of the present invention based on low-frequency ultrasonic waves；
Fig. 2 is the broad flow diagram of data processing in rope capacity measurement method provided in an embodiment of the present invention；
Fig. 3 is the rope capacity measuring device structure chart provided in an embodiment of the present invention based on low-frequency ultrasonic waves；
Fig. 4 is closely knit contact PZT (piezoelectric transducer) cross section structure schematic diagram provided in an embodiment of the present invention.
Specific embodiment
To facilitate the understanding of the present invention, a more comprehensive description of the invention is given in the following sections with reference to the relevant attached drawings.In attached drawing
Give presently preferred embodiments of the present invention.But the invention can be realized in many different forms, however it is not limited to this paper institute
The embodiment of description.On the contrary, purpose of providing these embodiments is makes to the more thorough of the disclosure understanding
Comprehensively.It should be noted that it can be directly to another when an element is considered as " connection " another element
Element may be simultaneously present centering elements.Unless otherwise defined, all technical and scientific terms used herein with
It is identical to belong to the normally understood meaning of those skilled in the art of the invention.Made in the description of the invention herein
Term, which is only for the purpose of describing specific embodiments, is not intended to limit the present invention.Term as used herein
" and/or " it include any and all combinations of one or more related listed items.
It please refers to shown in Fig. 1, Fig. 1 is the rope capacity measurement side provided in an embodiment of the present invention based on low-frequency ultrasonic waves
Method flow chart.
Rope capacity measurement method in the present embodiment based on low-frequency ultrasonic waves specifically comprises the following steps:
S101, low-frequency ultrasonic waves pulse translation sequence in wirerope is obtained.
S102, according to low frequency exceed the speed limit wave the pulse translation sequence and length of steel rope angle value between corresponding relationship, calculate
The measurement length of wirerope out, and calibration measurement result is sampled based on full-length.
Specifically, controlling single mode ultrasonic wave in steel wire by adjusting the frequency of low-frequency ultrasonic waves in measurement process
Transmission intensity and propagation distance in rope, the pulse that measurement low-frequency ultrasonic waves are propagated in wirerope to be measured, by adjusting transmitting
Frequency calculates propagation time of the low-frequency ultrasonic waves in wirerope to be measured, according to measurement frequency ultrasonic wave in such shaped steel wire rope
Spread speed, calculate the length of wirerope to be measured.In the present embodiment using closely knit contact PZT (piezoelectric transducer) occur and
Receive ultrasonic wave, low-pass filter controls ultrasonic frequency to realize transmission intensity and propagation of the low-frequency ultrasonic waves in wirerope
Distance, and emit the low-frequency ultrasonic waves for being used to identify the different frequency of ultrasonic signal.And the closely knit contact piezoelectricity is changed
The contact position of energy device and wirerope steel wire to be measured is arranged to the groove structure similar with wirerope, while cooperating diameter can basis
Wirerope diameter is adjusted to realize that closely knit contact PZT (piezoelectric transducer) and wirerope completely attach to.
Described to sample calibration measurement as a result, specifically including based on full-length: selection standard length wirerope to be measured carries out
The passing time of low-frequency ultrasonic waves difference measurement frequency measures, and obtains specific frequency low-frequency ultrasonic waves according to the length of selection and exist
Spread speed in wirerope to be measured calculates and corrects the length of measuring steel wire rope.
Emitted in rope capacity measurement using different frequency low-frequency ultrasonic waves, measurement data obtained is adopted
Similarity differentiation is carried out with the estimation of data statistics Plays difference, and extracts single mode low frequency ultrasound using Hilbert transform
Wave pulse signal, the loss that generation is transmitted to eliminate low-frequency ultrasonic waves in wirerope is influenced to measurement result bring, and base
Effective passing time of the low-frequency ultrasonic waves in wirerope to be measured is provided in time counting circuit, the reality for the wirerope that converts
Length.Detailed process as shown in Fig. 2, this partial data processing work mainly completed by micro-control unit in Fig. 3, the micro- place MUC
With Steel Cable Standard to be measured apart from different frequency after reason device unit reception wirerope low-mid-frequency ultrasonic wave similar pulse time signal
The attenuation degree tables of data of ultrasonic signal compares, using the standard deviation estimate side in mathematical statistics theory in comparison process
Method, using standard deviation estimate in the method for low frequency ultrasound wave measurement length is that the signal data that will be acquired deviates the distance of average
The square root of quadratic sum average is calculated and is compared, for reflecting the dispersion degree in data between pulse signal.Set arteries and veins
Rush signal amplitude x1,x2,x3... ... averaged amplitude value be μ, the standard deviation of the umber of pulse amplitude is according to standard deviation definition are as follows:
Carrying out estimation using standard deviation is to low-frequency ultrasonic waves signal in wirerope communication process
A kind of middle prediction for generating decaying, effectively identifies the low-frequency ultrasonic waves signal of different frequency.If standard deviation is larger,
It is serious to represent frequency signal propagation attenuation in such wirerope；And lesser standard deviation, the frequency ultrasonic wave is represented at this
Wirerope is stablized in transmitting, can be used in rope capacity test, meanwhile, it is one that the signal that energy converter measures is received in test
Various dimensions signal, the pulse frequency including signal, the beginning and ending time that signal is sent, signal response intensity value.Consider that a is super for low frequency
The transmitting signal of acoustic signals, b are the reception signal of low-frequency ultrasonic waves signal, and the response of a group data is strong in two groups of test signals
Degree value sequence is (a1,a2,a3……an)；The response intensity sequence of values of b group data is (b1,b2,b3……bn), then it can be with
Obtain a, the standard deviation of two groups of low-frequency ultrasonic waves response intensities of b are as follows:It is big according to the standard deviation
It is small to may determine that frequency low-frequency ultrasonic waves signal attenuation degree in testing, to judge the adaptability of test signal.With
The principle of standard deviation estimate method identification low-frequency ultrasonic waves signal are as follows: set a test signal strength threshold first, work as measurement
When the standard deviation of strength signal and mean value strength signal difference signal is greater than this threshold value, it is believed that measuring signal be with it is lower can
Reliability, i.e. measurement data cannot function as test result and provide；It is on the contrary, then it is assumed that the frequency of test low-frequency ultrasonic waves is suitble to the steel
Silk measurement of length, signal stabilization are preferable.Wirerope low-mid-frequency ultrasonic wave similar pulse time number acquired in another aspect
It is convenient for according to referring to wirerope different length same frequency ultrasonic signal passing time tables of data to be measured by Hilbert transform
Obtain the correct time interval data that low-frequency ultrasonic waves signal is propagated in wirerope.Ultrasonic signal obtained uses uncommon
Your Bert converts analysis and comparison in order to received low-frequency ultrasonic waves signal, analyzes the frequecy characteristic of signal to obtain signal
Metrical information.Since common Fourier transformation can only obtain the frequency domain information of signal, in the time domain without resolution ratio, thus
It can only illustrate that signal has certain specific frequency components, and can not illustrate the component and appear in which moment.Therefore it needs
The time frequency analysis that signal is carried out by Hilbert transform, time-domain information is mapped in another time domain by Mathematical treatment, such as
This shows the transmitting of low-frequency ultrasonic waves signal and received interval time characteristic information protrusion.Specific implementation process are as follows: assuming that
The one low frequency signal function of time is u (t), is v (t) by Hilbert transform, has:
It can be used by way of mathematics convolution to original signal simultaneously
Between relationship be described, v (t)=u (t)/π t, actually to measuring signal carry out Hilbert transform be equivalent to measurement institute
The frequency spectrum for reading signal does one 90 ° of phase shift, that is, the measuring signal of transformation front and back can make up the orthogonal right of phase, benefit
It is orthogonal right with these, the analytical function of measuring signal can be reconstructed.In the measuring signal analysis to real number field, reconstruct is utilized
One real signal is mapped in plural domain space by signal resolution function.According to this from the real space to complex space mapping (because
The Hilbert transform of real part is also corresponded to for imaginary part) 90 ° of phase shift properties of mode and Hilbert transform it can be concluded that, parsing
The real part of signal and imaginary part are mutually orthogonal.Therefore, analytic signal can be interpreted as to another expression-form of real signal itself.
Using Euler's formula as, analytic signal is write to the form of rotating vector.One transducing signal propagated in helical structure it is uncommon
When your Bert transformation results can accurately be propagated in wirerope by extracting the signal peak corresponding time to obtain it
Between it is poor.
Finally, the present invention repairing in rope capacity measurement is exactly based on sampling test, it is long to types of steel cord to be measured
Major parameter in degree and the transmitting of low-frequency ultrasonic waves signal, reflection frequency variation function program is adjusted, and is reduced because of wirerope
The difference of oneself state and cause the influence different to signal attenuation degree, while avoid with wirerope using wire broken rate increase institute
Lead to the decaying of wire rope transfers low frequency hypervelocity wave signal capabilities, while considering to transmit energy caused by steel cord structure parameter is different
Power variation, test data complete the amendment to test result with the parameter input program of testing setup, measure correlation curve relationship
It compares and is calculated according to sampling and obtain length and signal strength correlation curve relationship, so as to according to rope capacity and receiving
The non-linear relation of signal strength determine the physical length of wirerope.It can be mended according to wirerope sampling situations and canonical measure
The corresponding relationship for repaying coefficient determines the penalty coefficient in the measurement of Practical Project rope capacity, measures rope capacity and carry out
Amendment, thus the further computational accuracy and accuracy in boom hoist cable linear measure longimetry.
As shown in figure 3, Fig. 3 is 311 linear measure longimetry of the wirerope dress provided in an embodiment of the present invention based on low-frequency ultrasonic waves
Set structure chart.311 length-measuring appliance of wirerope in the present embodiment based on low-frequency ultrasonic waves specifically includes low-frequency ultrasonic waves hair
Penetrate end 301, low-frequency ultrasonic waves receiving end 302, micro-control unit 303, oscillatory excitation circuit 304, time reference circuit 305, function
Rate amplifying circuit 306, signal amplification circuit 307, temperature measuring circuit 308, data correction circuit 309, display terminal 310；Institute
It states low-frequency ultrasonic waves transmitting terminal 301 and closely knit contact PZT (piezoelectric transducer) for emitting low-frequency ultrasonic waves is installed；The low frequency is super
Sound wave receiving end 302 installs the closely knit contact PZT (piezoelectric transducer) for receiving low-frequency ultrasonic waves；The micro-control unit 303,
Oscillatory excitation circuit 304, time reference circuit 305, power amplification circuit 306 are sequentially connected；The power amplification circuit 306
The closely knit contact PZT (piezoelectric transducer) of output end connection low-frequency ultrasonic waves transmitting terminal 301；The low-frequency ultrasonic waves receiving end 302 connects
The input terminal of signal amplification circuit 307 is connect, the output end of the signal amplification circuit 307 connects micro-control unit 303；It is described micro-
Control unit 303 connects temperature measuring circuit 308, display terminal 310；The display terminal 310 connects data correction circuit
309。
When work, the additional hours under the conciliation of time reference circuit 305 by oscillatory excitation circuit 304 of micro-control unit 303
Between reference information pass to power amplification circuit 306, and drive low frequency to surpass by the higher-order of oscillation electric signal of power amplification circuit 306
The closely knit contact PZT (piezoelectric transducer) of sound wave transmitting terminal 301 forms low-frequency ultrasonic waves signal, and signal is after the transmitting of wirerope 311
Again by the closely knit contact PZT (piezoelectric transducer) in 311 other ends of wirerope to be measured, that is, low-frequency ultrasonic waves receiving end 302 by ultrasonic wave
Signal is converted to electric signal, passes to the signal fusing program in micro-control unit 303, temperature by signal amplification circuit 307
Measuring circuit 308 is that micro-control unit 303 provides the temperature data of test environment, is provided by data correction circuit 309 to be measured
The transmission speed of different low-frequency ultrasonic waves in wirerope 311, is computed the actual measured results for finally providing 311 length of wirerope
It is shown on display terminal 310.
As shown in figure 4, Fig. 4 is closely knit contact PZT (piezoelectric transducer) cross section structure schematic diagram provided in an embodiment of the present invention.
401 represent closely knit contact PZT (piezoelectric transducer) in figure；402 be wirerope to be measured, and specific work process is as follows:
Since the measurement range of ultrasonic wave exponentially declines with the increase of ultrasonic wave tranmitting frequency, existed using frequency
20KHz~2.5MHz range low-frequency ultrasonic waves cooperate closely knit contact PZT (piezoelectric transducer) can be preferably in coarse grain, long range
It carries out stablizing propagation in steel wire, although ultrasound intensity can weaken gradually energy and gradually use up, institute with the increase of propagation distance
The signal of transmitting can still be received by closely knit contact PZT (piezoelectric transducer), this has ensured low-frequency ultrasonic waves for length of steel rope
Application in degree measurement.
Closely knit contact PZT (piezoelectric transducer) is to be arranged to energy converter and wirerope contact position and wirerope steel wire to be measured
Similar groove structure, while cooperating diameter that can realize measurement low frequency according to the function that wirerope diameter to be measured is adjusted
It is in close contact between the transmitting of hypervelocity wave and the energy converter and wirerope to be measured that receive.
The higher-order of oscillation electric signal that ultrasonic generator produces is converted into the mechanical oscillation of high frequency by energy converter, travels to steel wire
It in rope, realizes and propagates in workpiece, acted at double by pulse amplifying or more than ten improve propagation distance with selling.When closely knit contact
Formula PZT (piezoelectric transducer) is mounted on wirerope one end, and couplant is added, and applies ultrasonic wave, since ultrasonic wave is a kind of in wirerope
Density interphase, the high frequency waves of radiation propagation, so as in the ultrasonic signal of wirerope the other end measurement transmitting.Ultrasonic wave
Parameter setting: frequency: 20KHz≤F≤2.5MHz；Power density: p=transmission power (W)/emission area (cm2)；It is set in
0.3w/cm2≤p≤0.5w/cm2；It is exported rectangular using high power transistor work in switch saturated in work
Wave.After square wave enters resonance circuit, after the filtering of inductance and capacitor, just become sine wave, sine wave passes through amplification
On the transducer, the time shaft of separated exciting time reference circuit configuration transmitting signal, and tracking and current limliting are carried out to frequency.
The low-frequency ultrasonic waves that technical solution of the present invention is obtained according to sampling pulse translation sequence in wirerope, according to low
Corresponding relationship between frequency hypervelocity pulse sequence and length of steel rope angle value calculates the measurement length of wirerope, and accuracy is high, surely
It is fixed reliable and practical；Meanwhile full-length sampling situations are carried out to Practical Project wirerope according to type wirerope to be measured
Linear measure longimetry is compensated and is corrected, computational accuracy and accuracy that can further in boom hoist cable linear measure longimetry.
Those of ordinary skill in the art will appreciate that realizing all or part of the process in above-described embodiment method, being can be with
Relevant hardware is instructed to complete by computer program, the program can be stored in a computer-readable storage medium
In, the program is when being executed, it may include such as the process of the embodiment of above-mentioned each method.Wherein, the storage medium can be magnetic
Dish, CD, read-only memory (Read-Only Memory, ROM) or random access memory (Random Access
Memory, RAM) etc..
Note that the above is only a better embodiment of the present invention and the applied technical principle.It will be appreciated by those skilled in the art that
The invention is not limited to the specific embodiments described herein, be able to carry out for a person skilled in the art it is various it is apparent variation,
It readjusts and substitutes without departing from protection scope of the present invention.Therefore, although being carried out by above embodiments to the present invention
It is described in further detail, but the present invention is not limited to the above embodiments only, without departing from the inventive concept, also
It may include more other equivalent embodiments, and the scope of the invention is determined by the scope of the appended claims.
Claims (3)
1. a kind of rope capacity measurement method based on low-frequency ultrasonic waves, which is characterized in that this method comprises the following steps:
S101, low-frequency ultrasonic waves pulse translation sequence in wirerope is obtained；It is controlled by adjusting the frequencies of low-frequency ultrasonic waves
Transmission intensity and propagation distance of the single mode ultrasonic wave in wirerope, measurement low-frequency ultrasonic waves are propagated in wirerope to be measured
Pulse, propagation time of the low-frequency ultrasonic waves in wirerope to be measured is calculated by adjusting tranmitting frequency, according to such fashioned iron
The spread speed of measurement frequency ultrasonic wave in cord, calculates the length of wirerope to be measured；Wherein, using closely knit contact piezoelectricity
Ultrasonic wave occurs and receives for energy converter, and low-pass filter controls ultrasonic frequency to realize biography of the low-frequency ultrasonic waves in wirerope
Intensity and propagation distance are broadcast, and emits the low-frequency ultrasonic waves for being used to identify the different frequency of ultrasonic signal；
S102, according to the corresponding relationship between the pulse translation sequence and length of steel rope angle value of low-frequency ultrasonic waves, calculate tapping
The measurement length of cord, and calibration measurement result is sampled based on full-length；Wherein, calibration measurement knot is sampled based on full-length
Fruit specifically includes: selection standard length wirerope to be measured carries out the passing time measurement of low-frequency ultrasonic waves difference measurement frequency, and
Spread speed of the specific frequency low-frequency ultrasonic waves in wirerope to be measured is obtained according to the length of selection, calculates and amendment measures steel
The length of cord.
2. the rope capacity measurement method according to claim 1 based on low-frequency ultrasonic waves, which is characterized in that the step
Rapid S102 further include: emitted using different frequency low-frequency ultrasonic waves, measurement data obtained is got the bid using data statistics
Quasi- difference estimation carries out similarity differentiation, and single mode low frequency ultrasound wave pulse signal is extracted using Hilbert transform, with
The loss that elimination low-frequency ultrasonic waves transmit generation in wirerope is influenced to measurement result bring, and is based on time counting circuit
Provide effective passing time of the low-frequency ultrasonic waves in wirerope to be measured, the physical length for the wirerope that converts.
3. the rope capacity measurement method according to claim 2 based on low-frequency ultrasonic waves, which is characterized in that will be described
The contact position of closely knit contact PZT (piezoelectric transducer) and wirerope steel wire to be measured is arranged to the groove structure similar with wirerope, together
Shi Peihe diameter can be adjusted to realize that closely knit contact PZT (piezoelectric transducer) and wirerope are completely attached to according to wirerope diameter.
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| CN108225226A (en) * | 2018-01-17 | 2018-06-29 | 河南中烟工业有限责任公司 | A kind of ultrasonic pulse-echo formula cigarette filter lengths measuring method |
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