CN109002642A - The quick design optimization method of vehicle body of railway vehicle chassis front end endergonic structure - Google Patents
The quick design optimization method of vehicle body of railway vehicle chassis front end endergonic structure Download PDFInfo
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Abstract
A kind of quick design optimization method of vehicle body of railway vehicle chassis front end endergonic structure, by establishing trolley finite element model, vehicle body bottom frame front end endergonic structure finite element model, vehicle body bottom frame front end endergonic structure finite element model is connect with trolley finite element model, as analysis and calculation model；Cell type, attribute and the material property of defined analysis computation model；Rigid wall and load cell finite element model, track finite element model are established, arranges acceleration transducer on trolley finite element model；Define contact relation, acceleration of gravity and primary collision speed；Output information is defined, output calculation document submits LS-DYNA platform to calculate；It is analyzed and determined according to calculated result, is met the requirements, analysis terminates, on the contrary then modify structural parameters and recalculate.The present invention fast implements the analysis optimization of vehicle body bottom frame front end endergonic structure, structural modification, model structure modification is completed in 4 hours, 1 calculating is completed within 1 hour, theoretical and experimental technique is provided for the design of vehicle body of railway vehicle chassis front end endergonic structure crash-worthiness and supports.
Description
Technical field
The present invention relates to rail vehicle collision passive security analyses and test field, specially a kind of vehicle body of railway vehicle bottom
Frame front end endergonic structure quickly analyzes design optimization method.
Technical background
With the raising of train speed and running efficiency, the collision passive safety of train is increasingly by the weight of people
Depending on collision passive security design has become an important link of train design.The generation of train collision accident not only threatens
The life security of passenger also will cause huge economic loss and social influence.Therefore, the passive security of train how is improved,
The life security and property safety of passenger are protected, reducing economic loss is worth being furtherd investigate.
The superiority and inferiority key of rail vehicle crash-worthiness is the design of chassis endergonic structure, and the country is frequently with bicycle Vehicular impact
Rigid wall simulation analysis carries out the research and design of chassis endergonic structure.The product completely new for one, in conceptual design rank
Section, it usually needs carry out up to a hundred analytical calculations to carry out the research and development of chassis endergonic structure, due to computer hardware condition
Limitation, is analyzed using complete bicycle vehicle finite element model, and analytical calculation needs more than ten hour (to use 60 cores every time
HPC computing platform), the entire design cycle is too long, and design cost is too high, is unable to satisfy fast-developing market rhythm.
Summary of the invention
The purpose of the present invention is to propose to a kind of quick design optimization methods of vehicle body of railway vehicle chassis front end endergonic structure, fastly
Speed realizes analysis optimization, the structural modification of vehicle body bottom frame front end endergonic structure, finally determines organization plan, reduces the design cycle.
For achieving the above object, the present invention provides a kind of vehicle body of railway vehicle chassis front end endergonic structure and quickly designs
Optimization method, it is characterised in that: include the following steps:
(101) trolley finite element model is established, and to trolley model counterweight, guarantees the gross weight of trolley and the visitor of practical car body
Room moiety by weight is identical；
(102) vehicle body bottom frame front end endergonic structure finite element model is established, guarantees finite element model and vehicle body bottom frame front end
Endergonic structure geometrical model is completely the same；
(103) vehicle body bottom frame front end endergonic structure finite element model is connect with trolley finite element model, entire finite element
Analysis and calculation model of the model as the quick analysis optimization of collision energy-absorbing；
(104) cell type of defined analysis computation model, attribute and material property；
(105) rigid wall and load cell finite element model are established, and be arranged in vehicle body bottom frame front end endergonic structure to have
Meta-model front end is limited, arranges acceleration transducer on trolley finite element model；
(106) track finite element model is established, track finite element model material is defined as body material；
(107) it defines and is contacted between contact relation, including analysis and calculation model interior contact and wheel track；
(108) acceleration of gravity and analysis and calculation model primary collision speed are defined；
(109) output information is defined, including calculates collision and terminates the time, time step is calculated, opens every output information
It is defeated to define every energy by control card for switch, each section force-time curve of defined analysis computation model, power-stroke curve
Out；
(110) output calculation document submits LS-DYNA platform to calculate；
(111) calculated result information is read, is analyzed and determined according to calculated result, checks vehicle body bottom frame front end energy-absorbing knot
Whether structure deformation is stable, controllable, and whether distorted pattern is consistent with design concept, and whether impact force and absorption energy meet vehicle and adopt
It is required specified in purchase contract, checks whether vehicle body bottom frame front end endergonic structure computational plasticity strain result has exceeded material used
Expect elongation, if vehicle body bottom frame front end endergonic structure stabilization, controllable, distorted pattern is consistent with design concept, impact force
And it absorbs energy and meets requirement specified in purchase of vehicle contract, while the strain of endergonic structure computational plasticity is without departing from material used
Expect elongation, then analysis terminate, on the contrary it is then return (101) step modify structural parameters recalculate；
The unit grid size Control of the vehicle body bottom frame front end endergonic structure finite element model 5mm~10mm it
Between；Structure of all thickness greater than 6mm is simulated using body unit grid, and structure of the thickness less than 6mm uses shell unit net
Lattice are simulated.
The software for being related to modeling in the analysis optimization design process is HYPERMESH pre-processing software.
The quick analysis optimization method of vehicle body bottom frame front end proposed by the present invention endergonic structure, major advantage are as follows:
(1) analysis optimization, the structural modification for fast implementing vehicle body bottom frame front end endergonic structure complete model knot in 4 hours
Structure modification completes 1 time for 1 hour and calculates and (use 60 core HPC computing platforms)；
(2) deformation, the compression travel of vehicle body bottom frame front end endergonic structure are realized；
(3) energy absorption, the compressed platform power of vehicle body bottom frame front end endergonic structure are realized；
(4) it modified, adjusted to scenario-frame according to calculated result；
(5) theoretical and experimental technique is provided for the design of vehicle body of railway vehicle chassis front end endergonic structure crash-worthiness to support.
Detailed description of the invention
The quick analysis optimization method flow diagram of Fig. 1 vehicle body of railway vehicle chassis front end endergonic structure；
The quick analysis optimization FEM model schematic diagram of Fig. 2 vehicle body of railway vehicle chassis front end endergonic structure；
It is bent that force-displacement curve, energy-absorbing-displacement are collided in the endergonic structure collision process of Fig. 3 vehicle body of railway vehicle chassis front end
Line schematic diagram；
Fig. 4 vehicle body of railway vehicle chassis front end endergonic structure tests high-speed camera location arrangements schematic diagram；
Fig. 5 vehicle body of railway vehicle chassis front end endergonic structure tests acceleration transducer location arrangements schematic diagram；
Fig. 6 vehicle body of railway vehicle chassis front end endergonic structure energy-absorbing-time graph analysis result is shown with comparison of test results
It is intended to；
Fig. 7 vehicle body of railway vehicle chassis front end endergonic structure displacement-time curve analysis result is shown with comparison of test results
It is intended to；
Fig. 8 vehicle body of railway vehicle chassis front end endergonic structure collides mean force-time analysis result and comparison of test results
Schematic diagram.
Specific embodiment
1) analysis and calculation model creates, and sees attached drawing 1, attached drawing 2
A, trolley finite element model is established using HYPERMESH pre-processing software, rapid Optimum finite element model includes: vehicle
Body chassis front end endergonic structure 1, trolley 2, clump weight 3, load cell 4, track 5；Trolley finite element model and actual tests
Trolley structure it is completely the same, and counterweight carried out to trolley model with clump weight, clump weight and trolley model pass through bolt progress
Connection, the gross weight for guaranteeing trolley are identical as the guest room moiety by weight of practical car body；
B, vehicle body bottom frame front end endergonic structure finite element model is established using HYPERMESH pre-processing software, guaranteed
Finite element model and vehicle body bottom frame front end endergonic structure geometrical model are completely the same, and unit grid size Control is in 5mm~10mm
Between, structure of all thickness greater than 6mm is simulated using body unit grid, and structure of the thickness less than 6mm uses shell unit
Grid is simulated；
C, vehicle body bottom frame front end endergonic structure finite element model is bolted with trolley finite element model, is entirely had
Limit analysis and calculation model of the meta-model as the quick analysis optimization of collision energy-absorbing.
2) defined analysis computation model cell type, attribute and material property
To unit definition unit type different in analysis and calculation model, plate is carried out to computation model according to practical structures
The setting of the attributes such as thickness, the diameter of bolt, calls material curves database to carry out material definition to computation model, material curves are true
Load-deformation curve is tested to obtain by carrying out dynamic tensile to material.
3) rigid wall and load cell, acceleration transducer model are established, sees attached drawing 2, attached drawing 5
Rigid wall is defined in HYPERMESH pre-processing software, collision wall when calculating as crash analysis；Establish dynamometry
4 model of sensor, and it is arranged in vehicle body bottom frame front end endergonic structure front end, for vehicle body bottom frame front end endergonic structure impact force
Measurement.6 diamond shapes represent acceleration transducer 9 in attached drawing 5, and the back side of rapid Optimum finite element model is arranged in.
4) model trajectory is established
Model trajectory is established in HYPERMESH pre-processing software, it is ensured that model trajectory structure and actual track structure one
It causes, track finite element model material is defined as body material, and trolley model is placed in orbit.
5) contact relation is defined
Every contact relation in analysis and calculation model collision process is established in HYPERMESH pre-processing software, including is divided
Contact relation when analysing interior contact and the operation of computation model between wheel track, coefficient of friction are set as 0.15.
6) acceleration of gravity and computation model primary collision speed are defined
By accelerating curve in HYPERMESH pre-processing software, apply vertical acceleration of gravity, keeps computation model
During the motion always with the presence of self weight；The original state of computation model is defined, primary collision speed is applied.
7) output information is defined
Definition calculates collision and terminates the time in HYPERMESH pre-processing software, calculates time step, opens every output
Message switching, defines speed, acceleration output information by node set on vehicle, and it is each to define computation model by unit set
Section force-time curve, power-stroke curve define every energy output by control card.
8) it submits and calculates
Analysis and calculation model file is exported in HYPERMESH pre-processing software, usually .k file, submit LS-DYNA
Software platform carries out collision simulation calculating using 60 core HPC computing platforms.
9) calculated result information is read, sees attached drawing 3
Abscissa represents shift value in figure, and ordinate (left side) represents collision force value, and ordinate (right side) represents energy-absorbing value, in figure
A is collision force-displacement curve, and b is energy-absorbing-displacement curve；Vehicle body bottom frame front end energy-absorbing is read by calculated result output file
Structure deforms in collision process, is displaced, stress, strain, force-time curve and power-stroke curve, determines vehicle body bottom frame front end
Whether the deformation of endergonic structure result is reasonable, if consistent with design concept, whether structural strain is within allowed band, structure
Whether can produce fracture, whether vehicle body bottom frame front end endergonic structure is whole in the form of controllable, gradual change carries out deformation energy-absorbing, touches
It hits power and absorbs whether energy meets requirement specified in purchase of vehicle contract.If endergonic structure deformation in vehicle body bottom frame front end is steady
Fixed, controllable, distorted pattern is consistent with design concept, and impact force and absorption energy meet requirement specified in purchase of vehicle contract,
Vehicle body bottom frame front end endergonic structure computational plasticity strain simultaneously is without departing from material therefor elongation, then analysis terminates, it is on the contrary then
1) modification structural parameters are returned to recalculate.
Entire analysis optimization design process is a closed loop control process, is only needed for the first time in analysis optimization design process
Foundation setting is carried out to all submodels (including trolley, vehicle body bottom frame front end endergonic structure, track etc.) and parameter, from second
Secondary beginning then only needs to modify vehicle body bottom frame front end endergonic structure model, other submodels and parameter in later analysis optimization
It does not need to re-establish setting.
Test example
1) attached drawing 1, attached drawing 2 are shown in the manufacture of vehicle body bottom frame front end endergonic structure tests exemplar
Vehicle body bottom frame front end endergonic structure final scheme is determined according to analysis optimization design process, before vehicle body bottom frame
Endergonic structure final scheme design drawing is held to produce vehicle body bottom frame front end endergonic structure exemplar, it is ensured that tests exemplar structure and analysis
Determining vehicle body bottom frame front end endergonic structure final scheme is consistent；
2) tests exemplar is mounted on test trolley, according to the boundary condition of analysis and calculation model, before vehicle body bottom frame
End endergonic structure part is bolted to connection with general test trolley；
3) counterweight is carried out to test trolley
According to the quality of analysis and calculation model, counterweight is carried out using steel plate on test trolley, it is ensured that test weight and point
It is consistent to analyse computation model weight, steel plate is bolted with test trolley；
4) it arranges test equipment, sees attached drawing 4, attached drawing 5
Two high-speed cameras 7 are arranged on collision 6 top of wall, realize and the vertical view of vehicle body bottom frame front end endergonic structure is clapped
It takes the photograph, is respectively arranged a high-speed camera in collision wall two sides, realizes and the side of vehicle body bottom frame front end endergonic structure is shot.?
Load cell is arranged on collision wall, arrange acceleration transducer on test trolley, load cell, acceleration transducer
Arrangement is completely the same with analysis and calculation model position, referring to attached drawing 5, collides arrangement infrared laser within wall 5m in distance and surveys
Fast instrument 8；
5) it tests
Power device pushes test trolley to be accelerated, and power device is taken off with test trolley after accelerator
From final trolley of testing hits collision wall at a predetermined velocity (error is within ± 0.5km/h), completes impact test；
6) attached drawing 6, attached drawing 7, attached drawing 8 are shown in experimental data processing and assessment
Experimental data processing and assessment are simultaneously compared with analysis data, mainly include that vehicle body bottom frame front end endergonic structure becomes
The comparison of shape form, impact force, energy-absorbing and deformation displacement.
Abscissa represents time value in Fig. 6, and ordinate represents energy-absorbing value, and c is analysis result and comparison of test results in figure
The error upper limit (+10%), d are that vehicle body bottom frame front end endergonic structure energy-absorbing-time graph (includes 3 test result curves and 1
Analyze result curve), e is analysis result and comparison of test results error floor (- 10%).
Abscissa represents time value in Fig. 7, and ordinate represents shift value, and f is analysis result and comparison of test results in figure
The error upper limit (+10%), g are that vehicle body bottom frame front end endergonic structure displacement-time curve (includes 3 test result curves and 1
Analyze result curve), h is analysis result and comparison of test results error floor (- 10%).
Abscissa represents time value in Fig. 8, and ordinate generation collides average force value, and i is analysis result and test result in figure
To the ratio error upper limit (+10%), j is that vehicle body bottom frame front end endergonic structure collides average force-time curve (comprising 3 test knots
Fruit curve and 1 analysis result curve), k is analysis result and comparison of test results error floor (- 10%).
By Experimental Comparison, vehicle body bottom frame front end endergonic structure analyzes result, test result curve on to ratio error
It limits in (+10%) and comparison error floor (- 10%) section, illustrates vehicle body bottom frame front end endergonic structure analysis result and test knot
Fruit relative error within ± 10% (including energy-absorbing, displacement, collision mean force), meets and wants specified in purchase of vehicle contract
It asks.
Claims (3)
1. a kind of quick design optimization method of vehicle body of railway vehicle chassis front end endergonic structure, it is characterised in that: including following step
It is rapid:
(101) trolley finite element model is established, and to trolley model counterweight, guarantees the gross weight of trolley and the guest room portion of practical car body
Divide weight identical；
(102) vehicle body bottom frame front end endergonic structure finite element model is established, guarantees finite element model and vehicle body bottom frame front end energy-absorbing
Construction geometry model is completely the same；
(103) vehicle body bottom frame front end endergonic structure finite element model is connect with trolley finite element model, entire finite element model
Analysis and calculation model as the quick analysis optimization of collision energy-absorbing；
(104) cell type of defined analysis computation model, attribute and material property；
(105) rigid wall and load cell finite element model are established, and is arranged in vehicle body bottom frame front end endergonic structure finite element
Acceleration transducer is arranged on trolley finite element model in model front end；
(106) track finite element model is established, track finite element model material is defined as body material；
(107) it defines and is contacted between contact relation, including analysis and calculation model interior contact and wheel track；
(108) acceleration of gravity and analysis and calculation model primary collision speed are defined；
(109) output information is defined, including calculates collision and terminates the time, time step is calculated, opens every output information switch,
Each section force-time curve of defined analysis computation model, power-stroke curve define every energy output by control card；
(110) output calculation document submits LS-DYNA platform to calculate；
(111) calculated result information is read, is analyzed and determined according to calculated result, checks that vehicle body bottom frame front end endergonic structure becomes
Whether shape is stable, controllable, and whether distorted pattern is consistent with design concept, and whether impact force and absorption energy meet purchase of vehicle conjunction
It is required with specified in, checks whether vehicle body bottom frame front end endergonic structure computational plasticity strain result has prolonged beyond material therefor
Exhibition rate, if vehicle body bottom frame front end endergonic structure stabilization, controllable, distorted pattern is consistent with design concept, impact force and suction
It receives energy and meets requirement specified in purchase of vehicle contract, while the strain of endergonic structure computational plasticity is prolonged without departing from material therefor
Exhibition rate, then analysis terminate, on the contrary it is then return (101) step modify structural parameters recalculate.
2. the quick design optimization method of vehicle body of railway vehicle chassis according to claim 1 front end endergonic structure, feature
Be: the unit grid size Control of the vehicle body bottom frame front end endergonic structure finite element model is thick between 5mm~10mm
Structure of the degree greater than 6mm is simulated using body unit grid, and structure of the thickness less than 6mm carries out mould using shell unit grid
It is quasi-.
3. the quick design optimization method of vehicle body of railway vehicle chassis according to claim 1 front end endergonic structure, feature
Be: the software for being related to modeling in the analysis optimization design process is HYPERMESH pre-processing software.
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| CN110781559A (en) * | 2019-10-30 | 2020-02-11 | 中车长春轨道客车股份有限公司 | Optimized design method for collision resistance of railway vehicle body |
| CN111680406A (en) * | 2020-05-27 | 2020-09-18 | 中国汽车技术研究中心有限公司 | Method for characterizing vehicle collision data and method for determining vehicle collision tolerance channel |
| CN114088430A (en) * | 2021-11-18 | 2022-02-25 | 中车长春轨道客车股份有限公司 | Method, device and equipment for testing crushing of rail vehicle and storage medium |
| CN114088430B (en) * | 2021-11-18 | 2023-05-23 | 中车长春轨道客车股份有限公司 | Method, device, equipment and storage medium for testing crushing of railway vehicle |
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