CN106294939B - Finite element occupant restraint system model and its modeling method based on Modularization modeling - Google Patents
Finite element occupant restraint system model and its modeling method based on Modularization modeling Download PDFInfo
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- CN106294939B CN106294939B CN201610610190.8A CN201610610190A CN106294939B CN 106294939 B CN106294939 B CN 106294939B CN 201610610190 A CN201610610190 A CN 201610610190A CN 106294939 B CN106294939 B CN 106294939B
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- G06F30/20—Design optimisation, verification or simulation
- G06F30/23—Design optimisation, verification or simulation using finite element methods [FEM] or finite difference methods [FDM]
Abstract
The invention discloses a kind of finite element occupant restraint system model based on Modularization modeling, including safe band model, air bag model, seat model, instrument Slab, steering wheel model, finite element dummy model, vehicle ground Slab and windshield model；Its modeling method includes the following steps: 1) to obtain the relevant performance parameter of each components；2) performance parameter is carried out to mark to each constraint submodel；3) constraint submodel and finite element dummy model are saved as into standalone module；4) by each constraint submodel border mesh unit rigidization；5) creation dummy contact with submodule is constrained and relevant control card are to complete to model；6) appropriate adjustment and simulation analysis are carried out to the model that step 5) is established.The present invention can be realized the modularization calibration and management of restraint system simulation model, and can the submodel of restraint system be optimized and be replaced, to achieve the purpose that the simulation accuracy and matching efficiency that improve restraint system.
Description
Technical field
The present invention relates to a kind of occupant restraint system model and its modeling methods, more particularly to one kind to be based on Modularization modeling
Finite element occupant restraint system model and its modeling method.
Background technique
Occupant restraint system mainly includes safety belt, air bag, seat, steering column, instrument board, steering wheel, floor
Deng.It mainly avoids or mitigates passenger and interior component that secondary collision occurs, and is reduced to injury suffered by occupant
It is minimum.
Traditional occupant restraint system emulation analysis mainly utilizes the multi-rigid body of Dutch road car research institute research and development
Madymo software carries out modeling and optimization using the method for multi-rigid body, and this analysis method has computational efficiency height, dummy model
The abundant feature of database, but can not simulating crew and interior trim real collision contact condition, while can not compare
More actually reaction constraints system absorbs dummy's kinetic energy situation, so that the simulation accuracy of restraint system model is lower, and flexibly
Property is poor, and matching efficiency is low.It is ground in addition, part company carries out restraint system using vehicle finite element model on what occupant injury influenced
Study carefully, this method avoid the shortcomings using madymo software, but computational efficiency is very low, and it greatly improves and calculates the time, thus
Influence research progress.
Summary of the invention
In view of the above shortcomings of the prior art, the purpose of the present invention is to provide a kind of having based on Modularization modeling
First occupant restraint system model and its modeling method are limited, can be realized the modularization calibration and management of restraint system simulation model,
And the submodel of restraint system can be optimized and be replaced, to reach the simulation accuracy and matching efficiency for improving restraint system
Purpose.
In order to solve the above-mentioned technical problem, the technical solution adopted by the present invention is that such: one kind being based on Modularization modeling
Finite element occupant restraint system model, it is characterised in that: including following constraint submodel: safe band model, air bag mould
Type, seat model, instrument Slab, steering wheel model, finite element dummy model, vehicle ground Slab and windshield model,
In, to the model that occupant injury is affected, carry out relevant performance test to improve the credibility of each module.
Further, the performance test includes: safety belt tension test, the static expansion test of air bag, seat
It loads dynamic test, instrument board dynamic impact test, the test of steering wheel static rigidity, the conquassation of steering column static state and is dynamically crushed
Test, TANK test and drop weight test.
A kind of modeling method of above-mentioned finite element occupant restraint system model, includes the following steps:
1) according to vehicle occupant restraint system parts test specification, each components impact test in restraint system is carried out,
Obtain the relevant performance parameter of each components；
2) the corresponding constraint submodel of each components, and deletion constraint are extracted from finite element occupant restraint system model
Lesser structure is influenced on occupant injury in submodel or one-dimensional unit is used to replace to simplify, then according to step 1
The relevant performance parameter of each components obtained carries out performance parameter to mark to each constraint submodel；
3) by after mark constraint submodel and finite element dummy model save as standalone module；
4) by each constraint submodel border mesh unit rigidization in addition to finite element dummy model, and * is used
CONSTRAINED_RIGID_BODIES keyword come fix it is each constraint submodel and vehicle floor relative position, then create about
Contacting between beam submodel certainly；
5) it according to the position and posture of dummy H point in test and test data adjustment dummy, is then tried according to complete automobile collision
Input pulse of the acceleration for the B column lower end tested or emulated as dummy, the contact and correlation of creation dummy and constraint submodule
Control card is to complete to model；
6) appropriate adjustment and simulation analysis are carried out to the model that step 5) is established, obtains dummy's damage evaluation of simulation data
Index parameter, and the dummy's injury criteria obtained with complete automobile collision test compares, and observes the registration of the two, if weight
It is right up to 70% or more, then the simplified model be effective finite element occupant restraint system model.
Compared with prior art, the present invention has the advantage that
(1) based on the emulation mode of finite element, can accurate contact situation of the simulation passenger with automobile interior, together
When by modular modeling ideology be introduced into vehicle restraint system Optimized Matching emulation in, can once using submodule set up it is more
A restraint system simulation model, submodule number shorten the modeling time, improve according to update, multiple analysis model synchronized updates
The Optimized Matching efficiency of restraint system, the high efficiency, high-precision, submodel for having reached enterprise's restraint system matched design are replaceable
Purpose.
(2) its protective value to occupant can be predicted in vehicle occupant restraint system optimization matching stage, while it is imitative
True result can provide foundation and guidance in the design of the vehicle occupant restraint system of development phase to new car, it is often more important that,
Can accurate analogue constraints system protective value, there is widely engineering application value and good application prospect.
(3) this finite element model, in addition to floor and front windshield, each module all carried out the test of corresponding components and
Verify mark, to improve the accuracy of model to a certain extent.
(4) test of certain vehicle is completed to the simplified model after mark, and the basic model that can be used as the vehicle carries out later period research；
The simplified model can be by modification dummy position and posture, and it is new to carry out to individually adjust parameter and the position of restraint system module
The exploitation and research of the restraint system performance of vehicle.
(5) simplified model more can really react the injury situation and dynamic response of dummy relative to madymo model,
Occupant injury research is carried out more efficiently using vehicle finite element model relative to traditional, is substantially reduced and is calculated the time.
Detailed description of the invention
Fig. 1 is the flow chart of the modeling method of finite element occupant restraint system model in the present invention.
Specific embodiment
Present invention will be further explained below with reference to the attached drawings and examples.
Embodiment: a kind of finite element occupant restraint system model based on Modularization modeling, including following constraint submodel:
Safe band model, air bag model, seat model, instrument Slab, steering wheel model, finite element dummy model, vehicle floor
Model and windshield model, wherein to the model that occupant injury is affected, carried out relevant performance test to improve
The credibility of each module.The performance test includes: safety belt tension test, the static expansion of air bag is tested, seat adds
Dynamic test, instrument board dynamic impact test, the test of steering wheel static rigidity, the conquassation of steering column static state and dynamic conquassation is carried to try
It tests, TANK is tested and drop weight test.
Referring to Fig. 1, a kind of modeling method of above-mentioned finite element occupant restraint system model, it is characterised in that: including as follows
Step:
1) according to vehicle occupant restraint system parts test specification, each components impact test in restraint system is carried out,
Obtain the relevant performance parameter of each components；Wherein, restraint system components impact test includes: the examination of steering wheel static rigidity
It tests, the conquassation of steering column static state and dynamic crushing test, instrument board dynamic impact test, seat load dynamic test, safety belt
Tension test, the static expansion test of air bag, TANK is tested and drop weight test.
2) the corresponding constraint submodel of each components, and deletion constraint are extracted from finite element occupant restraint system model
Lesser structure is influenced on occupant injury in submodel or one-dimensional unit is used to replace being simplified model to simplify；
Then the relevant performance parameter of each components obtained according to step 1 carries out performance parameter to mark to each constraint submodel.
3) by after mark constraint submodel and finite element dummy model save as standalone module；So that the later period is individually right
Module updates, and calls convenient for master file.When it is implemented, being saved to the constraint submodel and finite element dummy model marked
For INLCUDE file；In operating process, using the * INCLUDE keyword under Ls_dyna template in hypermesh by submodel
Save as INCLUDE file.
4) being injured due to floor on dummy influences very little, can be by its rigidization, while by other modules (in addition to dummy)
Border mesh unit rigidization；When it is implemented, by each constraint submodel border mesh unit in addition to finite element dummy model
Rigidization, then, a newly-built INCLUDE file are set to currently, and with * CONSTRAINED_RIGID_BODIES keyword come
The relative position of fixed each constraint submodel and vehicle floor, then creation constrains contacting between submodel certainly.
5) it according to the position and posture of dummy H point in test and test data adjustment dummy, is then tried according to complete automobile collision
Input pulse of the acceleration for the B column lower end tested or emulated as dummy, and give dummy apply gravity acceleration fields, creation dummy with
It constrains the contact of submodule and sets relevant control card to complete to model；In specific implementation process, the file described in step 4)
Middle creation dummy with the contact of restraint system module and relevant control card to complete to model, or individually addition INCLUDE file
Control card is set, final-period management is convenient for.Wherein, the datum mark that dummy positions in dummy H point expression test, and control card
It indicates to carry out the keyword that stability, derivation algorithm and output data etc. are controlled to simulation model.
6) appropriate adjustment and simulation analysis are carried out to the model that step 5) is established, obtains dummy's damage evaluation of simulation data
Index parameter, and from manikin head's resultant acceleration, neck power and torque, chest resultant acceleration and breast compressions amount, pelvis
Dummy's injury criteria that resultant acceleration, big leg strength and belt force direction and complete automobile collision test obtain carries out pair
Than observing the registration of the two, if registration is up to 70% or more, which is effective finite element occupant restraint system
Model；If being lower than 70%, repeatedly step 1)-step 6).
It according to the test data of certain vehicle, is emulated in conjunction with above-mentioned restraint system model to mark, can be obtained, emulate number
According to substantially tendency, peak value moment, peak value size and test data it is almost the same, then illustrate the simulation model have it is certain can
Reliability.
Above-mentioned simplified model according to certain vehicle test data complete to mark to can be used as after mark the basic model of the vehicle into
The research of row later period.The simplified model can be used as basic model and carry out restraint system matching and optimization design, tool in new car model development
Body is as follows:
1) each module position is adjusted according to new model digital-to-analogue or replaces crucial digital-to-analogue；
2) according to dummy H point and occupant space adjustment dummy position and posture；
3) acceleration pulse is updated；
4) air bag and safety belt relevant configuration are updated.
After completing aforesaid operations, so that it may it carries out solution and calculates to instruct restraint system part in new car model development,
Relevant parameter is adjusted simultaneously to reduce occupant injury in emulation, to realize beam system matching and optimization design.
Introduced modularization modeling method in the present invention, core concept are by vehicle occupant restraint system according to physics
Characteristic is divided into multiple submodule, and each submodule builds up independent model file.One simplified trolley model is by multiple sons
Model file composition.Each submodule is called using the * INCLUDE keyword under LS_dyna template in hyeprmesh software,
The document location of disparate modules is corresponded to after i.e. each * INCLUDE keyword.It submits Ls_dyan to call directly when calculating to be related to
Submodule, be assembled into simplified trolley model and solved.
In modeling process, the impact test of each components of restraint system is carried out first, obtains its relevant performance parameter, together
The limit element artificial module that Shi Jianli restraint system submodule simplifies save be independent INCLUDE file respectively to mark.
Each submodule is called using the * INCLUDE keyword under the Ls_dyna template in hypermesh software, is assembled into simplified
Trolley finite element model is solved.This method is capable of the protective value of good assessment vehicle occupant restraint system, and can
The replacement for realizing each submodule block models of restraint system, greatly improves the Optimized Matching efficiency of restraint system.
Finally, it should be noted that technical side the above examples are only used to illustrate the technical scheme of the present invention and are not limiting
Case, those skilled in the art should understand that, modification or equivalent replacement of the technical solution of the present invention are made for those, and
The objective and range for not departing from the technical program, are intended to be within the scope of the claims of the invention.
Claims (1)
1. a kind of modeling method of finite element occupant restraint system model, characterized by the following steps:
1) according to vehicle occupant restraint system parts test specification, each components impact test in restraint system is carried out, is obtained
The performance parameter of each components；
2) the corresponding constraint submodel of each components is extracted from finite element occupant restraint system model, and uses one-dimensional unit
Instead of extracting the corresponding constraint submodel of each components from finite element occupant restraint system model to be simplified, then root
According to the performance parameter for each components that step 1 obtains, performance parameter is carried out to mark to each constraint submodel；
3) by after mark constraint submodel and finite element dummy model save as standalone module；
4) by each constraint submodel border mesh unit rigidization in addition to finite element dummy model, and with * CONSTRAINED_
RIGID_BODIES keyword come fix it is each constraint submodel and vehicle floor relative position, then creation constrain submodel between
From contact；
5) according to dummy H point in test and test data adjustment dummy position and posture, then according to complete automobile collision test or
Input pulse of the acceleration of the B column lower end of emulation as dummy, creation dummy contact with submodule is constrained and relevant control
Card is to complete to model；
6) model established to step 5) is adjusted and simulation analysis, the dummy's injury criteria for obtaining simulation data are joined
Number, and the dummy's injury criteria obtained with complete automobile collision test compares, and the registration of the two is observed, if registration reaches
70% or more, then the simplified model is effective finite element occupant restraint system model；
Wherein, which can carry out restraint system matching and optimization design in new car model development as basic model, specifically
It is as follows:
1) each module position is adjusted according to new model digital-to-analogue；
2) according to dummy H point and occupant space adjustment dummy position and posture；
3) acceleration pulse is updated；
4) air bag and safety belt relevant configuration are updated.
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Inventor after: Liu Xi Inventor after: Hu Yuanzhi Inventor after: Pan Hua Inventor after: Liao Gaojian Inventor after: Huang Jie Inventor after: Liang Rui Inventor before: Pan Hua Inventor before: Hu Yuanzhi Inventor before: Liu Xi Inventor before: Liao Gaojian Inventor before: Huang Jie Inventor before: Liang Rui |
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