CN104731990A - Car crash safety analysis method - Google Patents
Car crash safety analysis method Download PDFInfo
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- CN104731990A CN104731990A CN201310710871.8A CN201310710871A CN104731990A CN 104731990 A CN104731990 A CN 104731990A CN 201310710871 A CN201310710871 A CN 201310710871A CN 104731990 A CN104731990 A CN 104731990A
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Abstract
The invention discloses a car crash safety analysis method. The car crash safety analysis method includes creating three-dimensional finite element models for a cab A-pillar, a pendulum bob, a suspension device and chains connected with the pendulum bob and the suspension device, and simulating impact of the pendulum bob to the cab A-pillar, wherein the chain models refer to at least two rigid sheets, and the rigid sheets, namely rigid elements, are sequentially connected through spherical hinges. The car crash safety analysis method has the advantages that real chains are simulated by the rigid sheets which are connected through the spherical hinges, and thus, accuracy in simulation of actual working conditions in the process of car crash safety development is improved; moreover, convenience in use and high simulation accuracy are achieved, calculation resources are saved effectively, and calculation efficiency is improved.
Description
Technical field
The present invention relates to automotive crash safety analysis field, particularly relate to a kind of automotive crash safety analytical approach.
Background technology
At present, the security performance of people to automobile is more and more paid attention to, and the state of actual accidents generation is focused on all the more in the design simulation experiment of automotive crash safety.In truck cap collision safety experiment field, pilothouse A post can be clashed into by the cylinder of two chain suspensions, simulate overturn accident, investigate pilothouse intensity and whether meet occupant safety protection requirement.But above-mentioned experimental expenses costliness (about 60,000 yuans/time) and the vehicle that will await development completes trial-production, if the later stage rectification space of vehicle of pinpointing the problems is little, cost is high, and the construction cycle of the vehicle extended is long.
In today of finite element analysis technology widespread use, efficiently, simulated experiment operating mode accurately, a kind of convenient, efficient analysis mode is provided for solving engineering problem.Utilize finite element analysis technology to simulate this operating mode, assessment pilothouse security performance, proposes recommendation on improvement, is the most effective current engineering means.But each analysis software of the prior art not yet provides chain constraint element, cannot adopt the movement locus of Finite Element Method accurate simulation pendulum, cause the accuracy of experimental result lower.
Therefore, wish that a kind of automotive crash safety analytical approach can overcome or at least alleviate the above-mentioned defect of prior art.
Summary of the invention
The object of the present invention is to provide a kind of automotive crash safety analytical approach to overcome or alleviate the above-mentioned defect of prior art.
For achieving the above object, the invention provides a kind of automotive crash safety analytical approach, described method is the three-dimensional finite element model of the chain set up pilothouse A post, pendulum, suspender and connect described pendulum and described suspender, simulation pendulum is to the impact of pilothouse A post, wherein, the model of described chain is at least two tablets connected successively with ball pivot, and described tablet is rigid element.
Preferably, described tablet is in turn connected into a string along the length direction of described tablet by ball pivot.
Preferably, the situation of chain that the length of described tablet uses according to actual collision safety test is arranged.
Preferably, described tablet is solid or shell hollow body.
Preferably, the shape of described tablet be that column is rectangular, rugby shape or sheet.
Preferably, the quality of described tablet equals the quality of the actual chain of equal length.
Preferably, the mould shapes of described pendulum is right cylinder, and described right cylinder is suspended from suspender model by two chain models.
Preferably, in three-dimensional finite element model, the model of described chain is connected with pendulum model with ball pivot.
Preferably, the model of described chain is connected with suspender model with ball pivot.
The tablet chain that is virtually reality like reality that above-mentioned automotive crash safety analytical approach utilizes ball comparatively to connect, the accuracy of actual condition simulated by effective raising vehicle in collision safety performance history, and easy to use, simulation precision is high, effectively saves computational resource, improve counting yield.
Accompanying drawing explanation
Fig. 1 is the schematic diagram of the three-dimensional finite element model of the test structure of automotive crash safety analytical approach according to an embodiment of the invention.
Fig. 2 is the schematic diagram of the three-dimensional finite element model of the pendulum of the chain suspension of the automotive crash safety analytical approach shown in Fig. 1.
Reference numeral:
| 1 | Tablet | 4 | Pendulum |
| 2 | Suspender | 5 | Pilothouse |
| 3 | Ball pivot | 6 | Pilothouse A post |
Embodiment
For making object of the invention process, technical scheme and advantage clearly, below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is further described in more detail.In the accompanying drawings, same or similar label represents same or similar element or has element that is identical or similar functions from start to finish.Described embodiment is the present invention's part embodiment, instead of whole embodiments.Be exemplary below by the embodiment be described with reference to the drawings, be intended to for explaining the present invention, and can not limitation of the present invention be interpreted as.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.Below in conjunction with accompanying drawing, embodiments of the invention are described in detail.
In describing the invention; it will be appreciated that; term " " center ", " longitudinal direction ", " transverse direction ", "front", "rear", "left", "right", " vertically ", " level ", " top ", " end " " interior ", " outward " etc. instruction orientation or position relationship be based on orientation shown in the drawings or position relationship; be only the present invention for convenience of description and simplified characterization; instead of instruction or imply indication device or element must have specific orientation, with specific azimuth configuration and operation, therefore can not be interpreted as limiting the scope of the invention.
Fig. 1 is the schematic diagram of the three-dimensional finite element model of the test structure of automotive crash safety analytical approach according to an embodiment of the invention.Fig. 2 is the schematic diagram of the three-dimensional finite element model of the pendulum of the chain suspension of the automotive crash safety method of testing shown in Fig. 1.
The three-dimensional finite element model of the test structure of the analytical approach of automotive crash safety shown in Fig. 1 comprises: pilothouse 5, pendulum 4, suspender 2 and connect the chain of pendulum 4 and suspender 2.The three-dimensional finite element model of above-mentioned test structure, by the impact of pendulum 4 pairs of pilothouse A posts 6, simulates overturn accident.
Namely pilothouse A post is positioned at the vehicle frame column of shield glass both sides.
The model of described chain is at least two tablets 1 connected successively with ball pivot 3, tablet 1 is rigid element, do not have particular/special requirement to the material of tablet and attribute, tablet 1 removes hinged place, and other degree of freedom all discharge (tablet 1 is equivalent to the minimum component forming actual chain in actual chain).
Advantageously, tablet 1 is in turn connected into a string along the length direction of tablet 1 by ball pivot 3, the situation of the chain that the length of tablet 1 uses according to actual collision safety test is arranged, and makes the length of tablet 1 approximate the length of each unit of actual chain, maximum chain that is virtually reality like reality.
Tablet 1 can be solid or shell hollow body, can select according to actual conditions.The tablet 1 that it is pointed out that on same chain model also can be the combination of solid and shell hollow body, but considers the simplicity of modeling and analytical calculation, and the tablet be preferably on same chain model selects same unit form.
The shape of tablet 1 is that column is rectangular, rugby shape, sheet or other Reasonable Shape, according to actual needs and the simplicity of modeling select.It is pointed out that the shape of tablet 1 also can be that column is rectangular, rugby shape, sheet and the combination of other Reasonable Shape, but consider the simplicity of modeling and analytical calculation, the tablet be preferably on same chain model selects same shape.
The quality of tablet 1 equals the quality of the actual chain of equal length, reaches the object of the farthest actual chain of simulation.
See Fig. 2, in illustrated embodiment of the present invention, the mould shapes of pendulum 4 is right cylinder, and described right cylinder is by two chain suspensions to suspender 2, and described chain is connected with pendulum 4 with ball pivot, and described chain is connected with suspender 2 with ball pivot.
The length of the chain of suspended pendulum 4 sets according to the length of the chain of the pendulum hung in authentic testing, the length of tablet 1 sets according to the length-flexible of chain, maximum Reality simulation chain, such as, when chain is shorter, it is shorter that the length of tablet is also arranged, and enables chain have good flexibility (in actual chain, when chain is shorter, it is shorter that the length of the component units of chain is also arranged).
Be understandable that, the angle that the quality of pendulum 4 and pendulum 4 clash into pilothouse A post 6 all limits according to the regulation of automotive safety test.Different test events is selected to be clashed into by different angles, such as, be that can clash into pilothouse A post from the dead ahead of pilothouse also can from the side impact pilothouse A post of pilothouse at the impact strength of test drives room A post, or pilothouse A post is clashed in direction from being 45 degree with vehicle body.The impulsive force that namely quality of pendulum clashes into pilothouse is also selected according to different test requests.
It is pointed out that and the simulating impact mode given by the present invention also can be utilized to clash into other positions of pilothouse, select according to concrete test event.
The shape of pendulum 4 is also not limited to the right cylinder shown in figure, also can be other Reasonable Shape, such as spheroid etc.
Advantageously, rotary damping can be added to ball pivot 3, carry out the actual chain of real simulation more.But, owing to not providing applicable rotary damping constraint in existing finite element analysis software, add assigned direction by giving ball pivot 3 and add damping to simulate rotary damping.Such as, different dampings is added to simulate rotary damping to X, Y, Z tri-directions of ball pivot.
Consider actual conditions, when adding damping to ball pivot, the damping of close pendulum 4 and suspender 2 is set to the damping of the ball pivot being greater than center section, makes the movement locus of simulation chain more close to the movement locus of true chain.
After having set up the three-dimensional finite element model needed for analysis, the situation of being clashed into automobile cab A post in the modeling actual experimental established by the pendulum of chain suspension can be utilized, simulation overturn accident, adopts the movement locus of the method accurate simulation pendulum of finite element.
Automotive crash safety analytical approach provided by the present invention gives a kind of effectively simple, and simulation flexibly connects analog form accurately, has saved a large amount of computational resources and computing time.The described tablet chain that is virtually reality like reality flexibly connecting analog form and utilize ball comparatively to connect, modeling is simple, and simulation precision is high.
The pendulum of above-mentioned chain suspension is utilized to clash into pilothouse A post to simulate overturn accident, can effectively improve the accuracy simulating actual condition in automotive crash safety performance history, for the assessment of pilothouse security performance provides accurate data, be conducive to the recommendation on improvement better proposing vehicle safety performance.
Above-mentioned automotive crash safety analytical approach testing cost is low, and modeling is simple, and simulation accurately, can test in the automobile research stage, proposing recommendation on improvement as early as possible, without the need to waiting for that car load completes trial-production, avoiding causing the prolongation in automobile research cycle and the raising of automobile research cost.
Finally it is to be noted: above embodiment only in order to technical scheme of the present invention to be described, is not intended to limit.Although with reference to previous embodiment to invention has been detailed description, those of ordinary skill in the art is to be understood that: it still can be modified to the technical scheme described in foregoing embodiments, or carries out equivalent replacement to wherein portion of techniques feature; And these amendments or replacement, do not make the essence of appropriate technical solution depart from the spirit and scope of various embodiments of the present invention technical scheme.
Claims (9)
1. an automotive crash safety analytical approach, it is characterized in that, set up pilothouse A post, pendulum, suspender and connect the three-dimensional finite element model of chain of described pendulum and described suspender, simulation pendulum is to the impact of pilothouse A post, wherein, the model of described chain is at least two tablets connected successively with ball pivot, and described tablet is rigid element.
2. automotive crash safety analytical approach as claimed in claim 1, it is characterized in that, described tablet is in turn connected into a string along the length direction of described tablet by ball pivot.
3. automotive crash safety analytical approach as claimed in claim 1, is characterized in that, the situation of the chain that the length of described tablet uses according to actual collision safety test is arranged.
4. automotive crash safety analytical approach as claimed in claim 1, it is characterized in that, described tablet is solid or shell hollow body.
5. automotive crash safety analytical approach as claimed in claim 1, is characterized in that, the shape of described tablet is that column is rectangular, rugby shape or sheet.
6. the automotive crash safety analytical approach according to any one of claim 1-5, is characterized in that, the quality of described tablet equals the quality of the actual chain of equal length.
7. automotive crash safety analytical approach as claimed in claim 1, it is characterized in that, the mould shapes of described pendulum is right cylinder, and described right cylinder is suspended from suspender model by two chain models.
8. automotive crash safety analytical approach as claimed in claim 1, it is characterized in that, in three-dimensional finite element model, the model of described chain is connected with pendulum model with ball pivot.
9. automotive crash safety analytical approach as claimed in claim 1, it is characterized in that, the model of described chain is connected with suspender model with ball pivot.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310710871.8A CN104731990A (en) | 2013-12-19 | 2013-12-19 | Car crash safety analysis method |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310710871.8A CN104731990A (en) | 2013-12-19 | 2013-12-19 | Car crash safety analysis method |
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| CN104731990A true CN104731990A (en) | 2015-06-24 |
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| CN201310710871.8A Pending CN104731990A (en) | 2013-12-19 | 2013-12-19 | Car crash safety analysis method |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108073768A (en) * | 2017-12-15 | 2018-05-25 | 天津金岸重工有限公司 | A kind of finite element analysis of Roll-Over Protective Structure simplifies method |
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| US7299677B2 (en) * | 2005-12-07 | 2007-11-27 | Chrysler Llc | Vehicle occupant analysis model for vehicle impacts |
| CN101706373A (en) * | 2009-11-23 | 2010-05-12 | 吉林大学 | Method and system of dynamic rollover test of engineering vehicle |
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2013
- 2013-12-19 CN CN201310710871.8A patent/CN104731990A/en active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| US7299677B2 (en) * | 2005-12-07 | 2007-11-27 | Chrysler Llc | Vehicle occupant analysis model for vehicle impacts |
| CN101706373A (en) * | 2009-11-23 | 2010-05-12 | 吉林大学 | Method and system of dynamic rollover test of engineering vehicle |
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| 刘丽亚: "商用车驾驶室乘员安全性仿真分析与试验研究", 《中国博士学位论文全文数据库工程科技Ⅱ辑》 * |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108073768A (en) * | 2017-12-15 | 2018-05-25 | 天津金岸重工有限公司 | A kind of finite element analysis of Roll-Over Protective Structure simplifies method |
| CN108073768B (en) * | 2017-12-15 | 2021-05-18 | 天津金岸重工有限公司 | Finite element analysis simplification method of rollover protection structure |
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Application publication date: 20150624 |
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