CN107748812A - A kind of honeycomb fashion anti-creep energy absorber collision simulation method and system - Google Patents

Abstract

The invention discloses a collision simulation method and system for a honeycomb anti-climbing energy absorber, which is applied to the collision test of energy-absorbing parts of rail transit vehicles, and uses a computer to control the trolley and the honeycomb anti-climbing energy-absorbing device installed on the trolley The simulation modeling is carried out respectively for the rail transit vehicle collision, and the simulation modeling process includes the following steps: S1, establishing and processing a geometric model, respectively establishing a geometric model for the trolley and the honeycomb anti-climbing energy absorber; S2 . Grid division, performing grid division for the geometric model; S3, performing feature configuration on the geometric model; S4, setting a control card, setting control parameters for the modeling process. The collision simulation method of the honeycomb anti-climbing energy absorber can replace part of the repetitive test, saving design cost and period; the analysis results are obtained through calculation, which are used to guide related tests and conduct comparative analysis with test data; and provide guidance for subsequent structural optimization Finite element analysis lays the foundation.

Description

A collision simulation method and system for a cellular anti-climbing energy absorber

technical field

The invention belongs to the field of locomotives and vehicles, and in particular relates to a collision simulation method and system for a cellular anti-climbing energy absorber.

Background technique

In recent years, my country's high-speed rail, subway and other rail transit construction has achieved leapfrog development, bringing great convenience to the national economy and life. At the same time, due to the large capacity and high speed of rail transit vehicles, once a collision safety accident occurs, it will cause great harm.

The honeycomb anti-climbing energy absorber adopts metal honeycomb material, which has the advantages of low density, low rigidity, strong impact resistance and controllable compression deformation, and is an ideal energy-absorbing material for cushioning. As a typical passive safety energy-absorbing component of rail transit vehicles, it can effectively absorb the energy during train collision, protect the personal safety of passengers and reduce property losses, and is an important part of passive safety protection technology for high-speed trains. The honeycomb anti-climbing energy absorber is mainly installed on the head of the train or between the trains, and is an important component for passive safety protection of the train and passengers in case of accidental collision of the train.

In order to improve the structural performance of the honeycomb anti-climbing energy absorber, a large number of collision tests need to be carried out to test the energy absorption effect of the honeycomb anti-climbing energy absorber. Such an experimental process will consume a lot of manpower and material resources, resulting in a long research and development cycle and high research and development costs. Therefore, in order to meet the design requirements of the cellular anti-climbing energy absorber, computer simulation methods can be used to carry out relevant simulation experiments, that is, the simulation modeling method is used to establish the geometric model of the cellular anti-climbing energy absorber, and the finite element The simulation calculation can replace part of the repetitive test, which can effectively save the cost of the design, thereby improving the passive safety performance of the rail transit vehicle.

In view of this, the present invention is proposed.

Contents of the invention

The technical problem to be solved by the present invention is to overcome the deficiencies of the prior art and provide a method and system for the collision simulation of the cellular anti-climbing energy absorber. The analysis results are used to guide relevant tests and conduct comparative analysis with test data; and lay the foundation for subsequent structural optimization finite element analysis.

In order to achieve this object, the present invention adopts following technical scheme:

A collision simulation method for a honeycomb anti-climbing energy absorber, which is applied to the collision test of energy-absorbing components of rail transit vehicles, using a computer to simulate and model the trolley and the honeycomb anti-climbing energy absorber installed on the trolley respectively , which is used to simulate the collision of rail transit vehicles. The simulation modeling process includes the following steps:

S1. Establish and process a geometric model, and establish a geometric model for the trolley and the honeycomb anti-climbing energy absorber respectively;

S2. Grid division, performing grid division for the geometric model;

S3. Perform feature configuration on the geometric model;

S4, setting a control card, and setting control parameters for the modeling process.

Further, the step S1 also includes performing geometric cleaning on the geometric model; the geometric cleaning is to delete features in the geometric model that contribute little to the simulation calculation results.

Further, in the step S2, the mesh division of the geometric model is based on knowledge of collision finite element modeling and experimental experience;

Preferably, the element types of each grid are divided into shell elements and hexahedral elements.

Further, in the step S2, the connection relationship of each part in the geometric model is also defined;

Preferably, the connection relationship includes common nodes, rigid connections, rotational hinges and bound contacts.

Further, the step S3 also includes the following steps:

S31, assigning materials and defining attributes; respectively assigning specific materials to the geometric models, and defining attributes used to characterize whether the geometric models are entities;

S32. Setting a contact relationship, which is used to represent the contact relationship of each part after the rail transit vehicle collides;

S33 , setting the working condition load.

Further, in the step S31, a rigid material and/or an elastic-plastic material is assigned to the geometric model of the trolley, and an elastic-plastic material and/or honeycomb material is assigned to the geometric model of the honeycomb anti-climbing energy absorber.

Further, the attributes in the step S31 include two types of shells and entities.

Further, in the step S4, the control card includes a time step, and/or a deadline, and/or an hourglass, and/or a shell, and/or an entity, and/or a contact and/or an output.

Further, when performing simulation modeling on the trolley, after step S32 is completed, step S32' needs to be performed, and the step S32' is to adjust the mass and center of mass of the trolley.

A kind of cellular anti-climbing energy absorber collision simulation system, applying any one of the above-mentioned cellular anti-climbing energy absorber collision simulation methods, the cellular anti-climbing energy absorber collision simulation system includes a trolley simulation model and a cellular Anti-climbing energy absorber simulation model, the honeycomb anti-climbing energy absorber simulation model includes: mounting plate, and/or reinforcement plate, and/or guide beam, and/or anti-climbing teeth, and/or outer cover plate, And/or decorative boards, and/or anti-climbing teeth installation boards, and/or lining boards and/or honeycomb aluminum simulation models.

After adopting the above technical solution, the present invention has the following beneficial effects compared with the prior art.

A kind of honeycomb type anti-climbing energy absorber collision simulation method and system of the present invention, use computer to establish geometric model respectively to trolley and and honeycomb type anti-climbing energy absorber, can according to the bogie and cellular anti-climbing energy absorber Different performance requirements are used to establish different geometric models through different modeling steps and methods, so that the established geometric models are closer to the actual application, more accurately simulate realistic collision situations, and achieve the expected collision simulation effect. In the process of building the geometric model, the grid is accurately divided according to the knowledge of collision finite element modeling and experimental experience, so as to make full preparations for the subsequent finite element analysis, and accurately configure the features according to the specific requirements and characteristics of different equipment , so as to establish an accurate and complete simulation model of the trolley and the honeycomb anti-climbing energy absorber.

The invention also clearly defines the connection relationship, material, contact relationship and working condition load of each part in the geometric model of the trolley and the honeycomb anti-climbing energy absorber, so as to achieve the effect of accurate simulation. For the modeling process, specific control cards are set to ensure the accuracy of the modeling process. For the special requirements of the trolley, a step of adjusting the mass and center of mass of the trolley is added in the modeling process. As for the simulation model of the honeycomb anti-climbing energy absorber, the simulation model is established separately according to the specific structure of each component.

The present invention can replace part of repeated tests, save design cost and period; obtain analysis results through calculation, which can be used to guide related tests and conduct comparative analysis with test data; and lay the foundation for subsequent structural optimization finite element analysis.

The specific implementation manners of the present invention will be further described in detail below in conjunction with the accompanying drawings.

Description of drawings

The accompanying drawings, as a part of the present invention, are used to provide a further understanding of the present invention, and the schematic embodiments of the present invention and their descriptions are used to explain the present invention, but do not constitute improper limitations to the present invention. Apparently, the drawings in the following description are only some embodiments, and those skilled in the art can also obtain other drawings according to these drawings without creative efforts. In the attached picture:

Fig. 1 is a kind of honeycomb type anti-climbing energy absorber collision simulation method of the present invention and the step schematic diagram that system carries out simulation to trolley;

Fig. 2 is a schematic diagram of the steps of simulating the honeycomb anti-climbing energy absorber by a method and system for simulating the collision of the cellular anti-climbing energy absorber according to the present invention.

It should be noted that these drawings and text descriptions are not intended to limit the concept scope of the present invention in any way, but illustrate the concept of the present invention for those skilled in the art by referring to specific embodiments.

Detailed ways

In order to make the purpose, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. The following embodiments are used to illustrate the present invention , but not to limit the scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "lower", "front", "rear", "left", "right", "vertical", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, or in a specific orientation. construction and operation, therefore, should not be construed as limiting the invention.

In the description of the present invention, it should be noted that unless otherwise specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection. Connected, or integrally connected; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention in specific situations.

As shown in Figures 1 and 2, the present invention discloses a collision simulation method and system for a cellular anti-climbing energy absorber, which is applied to the collision test of energy-absorbing components of rail transit vehicles, and uses a computer to control the trolley and install it on the trolley. The honeycomb anti-climbing energy absorbers on the platform are respectively simulated and modeled for simulating the collision of rail transit vehicles. The simulation modeling process includes the following steps: S1, establishing and processing the geometric model, and providing the energy absorber for the trolley and the honeycomb anti-climbing energy absorber. S2, meshing, meshing the geometric model; S3, performing feature configuration on the geometric model; S4, setting a control card, setting control parameters for the modeling process. The collision simulation method of the honeycomb anti-climbing energy absorber can replace part of the repetitive test, saving design cost and period; the analysis results are obtained through calculation, which are used to guide relevant tests and conduct comparative analysis with test data; and provide a basis for subsequent structural optimization Finite element analysis lays the foundation.

Example 1

As shown in Fig. 1 and Fig. 2, this embodiment discloses a collision simulation method for a cellular anti-climbing energy absorber. The method is applied to the collision test of the energy-absorbing parts of rail transit vehicles, and a computer is used to simulate and model the trolley and the honeycomb anti-climbing energy absorber installed on the trolley, so as to simulate the collision of rail transit vehicles. The honeycomb anti-climbing energy absorber includes a mounting plate, a rib plate, a guide beam, an anti-climbing tooth, an outer cover plate, a decorative plate, an anti-climbing tooth installation plate, a lining plate and honeycomb aluminum. The cellular anti-climber collision simulation modeling method, through the finite element simulation calculation, realizes the acquisition of data such as structural deformation mode, collision force and energy absorption during the collision process of the anti-climber of rail transit vehicles, and provides a basis for the structural performance of the subsequent anti-climber. Optimization lays the groundwork.

In this embodiment, the simulation modeling process for the two different devices of the trolley and the cellular anti-climbing energy absorber generally includes the following steps:

S1. Establish and process a geometric model, and establish a geometric model for the trolley and the honeycomb anti-climbing energy absorber respectively;

S2. Grid division, performing grid division for the geometric model;

S3. Perform feature configuration on the geometric model;

S4, setting a control card, and setting control parameters for the modeling process.

In the step S1, geometric cleaning is also performed for the geometric model. In this process, the three-dimensional geometric model of the trolley or the honeycomb anti-climbing energy absorber established in step S1 is imported into the finite element preprocessing software Hypermesh, and the necessary geometric cleaning is performed to facilitate subsequent mesh division. During the geometric cleaning process, the features in the geometric model that contribute little to the simulation calculation results are deleted. That is to delete some unnecessary features, such as some unnecessary faces, some small chamfers and other small features that are not easy to draw when drawing a grid, and close some unclosed faces, and press down some free edges ,and many more. The model after geometry cleaning can avoid the problem of large number of meshes and poor quality when performing automatic division in the subsequent mesh division.

In the step S2, the mesh division of the geometric model is based on the collision finite element modeling knowledge and experimental experience, and the connection relationship of each part in the geometric model is defined. In this embodiment, the element types of each grid of the trolley or the anti-climbing energy absorber are divided into shell elements and hexahedron elements. And according to its actual situation, the connection relationship is designed to include common nodes, rigid connections, rotating hinges, and binding contacts.

For step S3, there are some differences between the trolley model and the honeycomb anti-climbing energy absorber, as follows:

As shown in Figure 2, for the cellular anti-climbing energy absorber, step S3 also includes the following steps:

S31, assigning materials and defining attributes; respectively assigning specific materials to the geometric models, and defining attributes used to characterize whether the geometric models are entities;

S32. Setting a contact relationship, which is used to represent the contact relationship of each part after the rail transit vehicle collides;

S33 , setting the working condition load.

Since the honeycomb anti-climbing energy absorber has various parts, and in order to achieve the best energy absorption effect, the materials of each part are strictly regulated and differentiated, and different material combinations will obtain different simulation effects, so the said In step S31, an elastoplastic material and/or honeycomb material is assigned to the geometric model of the honeycomb anti-climbing energy absorber. The anti-climber model mainly uses elastic-plastic materials Q235, Q345, Q450, SUS304 and the honeycomb material uses Hypermesh's MATL26 material model. The attributes described in step S31 include both shell and entity

In the step S32, the contact relationship is set, and the contact relationship is used to characterize the contact relationship of each part after the rail transit vehicle collides, including self-contact, surface-to-surface contact, surface-to-surface binding contact, point-to-surface binding contact, and rigid contact. wall contact.

For the trolley, as shown in Figure 1, in the modeling process of the trolley, step S3 includes the following steps:

S31, assigning materials and defining attributes; respectively assigning specific materials to the geometric models, and defining attributes used to characterize whether the geometric models are entities;

S32. Setting a contact relationship, which is used to represent the contact relationship of each part after the rail transit vehicle collides;

S32', adjusting the quality and the center of mass of the trolley;

S33 , setting the working condition load.

In the step S31, a rigid material and/or an elastoplastic material is assigned to the geometric model of the trolley. The trolley model mainly adopts the MATL26 material model using the rigid material Hypermesh, and the elastic-plastic material Q450. The attributes in step S31 include shell and entity. Similar to the anti-climbing energy absorber, the contact relationship is set in the step S32, and the contact relationship is used to characterize the contact relationship of each part after the collision of the rail transit vehicle, including self-contact, surface-to-surface contact, and surface-to-surface binding. Contact, point-to-surface bound contact, and rigid wall contact. However, since the size and load of the trolley have a great influence on the analysis results, when the trolley is simulated and modeled, after step S32 is completed, step S32' is required, and the step S32' is to adjust the trolley. mass and centroid.

In the step S4, a control card is set, and the control card includes time step, and/or deadline, and/or hourglass, and/or shell, and/or entity, and/or contact and/or output.

In this embodiment, the track is also simulated and modeled at the same time. Since the structure of the track is relatively simple, the same steps as the above trolley are used for modeling, which will not be repeated here.

After completing the above modeling steps in this embodiment, after checking and modifying the model, the calculation file can be exported for simulation calculation. The design and optimization of the honeycomb anti-climbing energy absorber model can be carried out according to the simulation calculation results, and the follow-up crash test and simulation experiment comparison can also be known.

Example 2

This embodiment discloses a collision simulation system for a cellular anti-climbing energy absorber. The collision simulation method for a cellular anti-climbing energy absorber described in any of the above embodiments is applied. The collision simulation system for a cellular anti-climbing energy absorber Including the simulation model of the trolley and the simulation model of the honeycomb anti-climbing energy absorber.

The simulation model of the honeycomb anti-climbing energy absorber includes: a mounting plate, and/or a rib, and/or a guide beam, and/or an anti-climbing tooth, and/or an outer cover plate, and/or a decorative plate, and/or Anti-climbing tooth mounting plate, and/or lining plate and/or honeycomb aluminum simulation model. .

The above description is only a preferred embodiment of the present invention, and does not limit the present invention in any form. Although the present invention has been disclosed as above with preferred embodiments, it is not intended to limit the present invention. Anyone familiar with the technology of this patent Without departing from the scope of the technical solution of the present invention, personnel can use the technical content of the above prompts to make some changes or modify them into equivalent embodiments with equivalent changes. In essence, any simple modifications, equivalent changes and modifications made to the above embodiments still fall within the scope of the solutions of the present invention.

Claims (10)

1. A kind of honeycomb type anti-climbing energy absorber collision simulation method, is applied in rail transit vehicle energy-absorbing parts collision test, it is characterized in that, use computer to chassis and be installed on the honeycomb type anti-climbing energy absorption on the trolley The simulation modeling is carried out separately for the simulation modeling of rail transit vehicles. The simulation modeling process includes the following steps: S1. Establish and process a geometric model, and establish a geometric model for the trolley and the honeycomb anti-climbing energy absorber respectively; S2. Grid division, performing grid division for the geometric model; S3. Perform feature configuration on the geometric model; S4, setting a control card, and setting control parameters for the modeling process. 2. The collision simulation method of the honeycomb type anti-climbing energy absorber according to claim 1, characterized in that, said step S1 also includes performing geometric cleaning for said geometric model; said geometric cleaning is to make said geometric model The features that have a small contribution to the simulation calculation results are deleted. 3. the cellular anti-climbing energy absorber collision simulation method according to claim 1, is characterized in that, in described step S2, the described grid division that geometric model is carried out is based on collision finite element modeling knowledge and experiment division by experience; Preferably, the element types of each grid are divided into shell elements and hexahedral elements. 4. The collision simulation method of the cellular anti-climbing energy absorber according to claim 3, characterized in that, in the step S2, the connection relationship of each part in the geometric model is also defined; Preferably, the connection relationship includes common nodes, rigid connections, rotational hinges and bound contacts. 5. The collision simulation method of the cellular anti-climbing energy absorber according to claim 1, wherein said step S3 also includes the following steps: S31, assigning materials and defining attributes; respectively assigning specific materials to the geometric models, and defining attributes used to characterize whether the geometric models are entities; S32. Setting a contact relationship, which is used to represent the contact relationship of each part after the rail transit vehicle collides; S33 , setting the working condition load. 6. The collision simulation method of the honeycomb anti-climbing energy absorber according to claim 5, characterized in that, in the step S31, rigid materials and/or elastoplastic materials are given to the geometric model of the trolley, and the honeycomb anti-climbing energy absorber is The geometrical model of the crawler absorber is endowed with elastoplastic and/or cellular materials. 7. The collision simulation method of the cellular anti-climbing energy absorber according to claim 5, characterized in that, the attributes in the step S31 include two types of shell and entity. 8. The collision simulation method of the cellular anti-climbing energy absorber according to claim 1, characterized in that, in the step S4, the control card includes a time step, and/or a cut-off time, and/or an hourglass, and/or housing, and/or entity, and/or contact and/or output. 9. The collision simulation method of the honeycomb anti-climbing energy absorber according to claim 5, characterized in that, when the trolley is simulated and modeled, after step S32 is completed, step S32' is required, and the step S32' It is to adjust the mass and center of mass of the trolley. 10. A collision simulation system for a cellular anti-climbing energy absorber, applying the collision simulation method for a cellular anti-climbing energy absorber according to any one of claims 1 to 9, characterized in that the cellular anti-climbing energy absorber The collision simulation system includes a trolley simulation model and a honeycomb anti-climbing energy absorber simulation model, and the honeycomb anti-climbing energy absorber simulation model includes: a mounting plate, and/or ribs, and/or a guide beam, and/or Anti-climbing teeth, and/or outer cover panels, and/or decorative panels, and/or anti-climbing teeth installation plates, and/or lining boards and/or honeycomb aluminum simulation models.