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SUV车侧面碰撞安全性仿真研究 总被引:6,自引:0,他引:6
在我国汽车碰撞交通事故中,侧面碰撞事故占30%左右,是发生频率最高和造成人员伤亡最多的事故类型,为此开展汽车的侧面耐撞性能研究是十分重要的。针对国内某SUV车型,建立整车有限元模型,在模型验证的基础上,然后按照欧洲侧面碰撞法规ECER95对该车型进行侧面碰撞模拟仿真。从碰撞变形、碰撞吸能、碰撞力以及关键点的加速度值对仿真结果进行分析、评价,并提出了提高整车侧面碰撞安全性能的一些合理化建议,为今后开展汽车的侧面碰撞研究及提高轿车侧面耐撞性能提供了可借鉴的方法。 相似文献
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矩形薄壁空心直梁是汽车纵梁经常采用的结构形式,并且是承受正面碰撞的主要部件,其结构的耐撞性及碰撞吸能优化是现代汽车研究的重要内容.以矩形薄壁梁为研究对象,基于动态有限元分析模型,利用LS-DYNA软件中的OPT模块技术,研究矩形薄壁梁横截面的边长比变化对其耐撞性能的影响,对薄壁直梁在轴向冲击载荷下的耐撞性能进行了优化仿真.优化结果表明,当矩形两个边长的比值为0.6时,结构的碰撞力峰值最小,吸收的塑性变形能最大,具有最好的耐撞性能. 相似文献
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利用显有限元方法对4种典型车用薄壁结构进行正碰碰撞仿真,得到其的变形模式、吸能规律、冲击力、速度等一系列参数,分析了不同结构耐碰撞性能的优劣,为车辆耐碰撞性能的设计和构件截面形状的优化奠定了基础。 相似文献
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基于逐步回归模型的汽车碰撞安全性多目标优化 总被引:11,自引:2,他引:9
汽车结构的耐撞性及碰撞吸能优化是现代汽车工业的重要研究内容。面对传统优化方法难以找到汽车结构耐撞性问题多目标参数最优解的难题,在汽车结构碰撞安全性问题的研究中,结合试验设计、响应表面模型和有限元仿真程序提出一种基于逐步回归模型的多目标优化设计方法。利用该方法对以汽车前端结构的加强件作为设计变量,以整车质量、脚踏板在碰撞过程中的侵入量和整车碰撞加速度积分值作为目标函数的汽车100%正面碰撞以及40%正面偏置碰撞的多目标优化问题进行仿真优化研究,结果表明该方法对于汽车结构碰撞安全性的优化具有明显的效果。 相似文献
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针对汽车前纵梁耐撞部件吸能盒结构形式,研究了功能密度梯度泡沫铝填充铝合金锥管在低速冲击下的耐撞性模型优化。通过对泡沫铝填充锥管的轴向低速压溃仿真分析,获得仿真变形状态、载荷及比吸能量对位移的曲线,并对比分析仿真和实验数据,证明仿真模型的有效性。以泡沫铝内核与锥管的接触强度为研究对象,研究其对泡沫铝填充锥管吸能性能的影响。最后提出基于强粘结接触模型的含有诱导槽的功能密度梯度泡沫铝填充模型,并研究其耐撞性。研究表明,具有诱导槽的强粘结泡沫铝填充锥管在碰撞中的峰值载荷更低,载荷变化更平稳,比吸能更大,是一种在汽车制造工程应用中可以考虑的新型吸能结构。 相似文献
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借助于CAE前后处理软件HyperMesh HyperView及LS-DYNA,建立了国产某轿车的整车有限元模型,对其进行侧面碰撞仿真分析,得到了碰撞过程中的相关数据;通过改善前地板横梁零件结构和强度,改善侧面碰撞性能,满足侧撞法规要求。 相似文献
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为了对全框式副车架侧边纵梁结构进行耐撞性优化设计,以副车架侧边纵梁结构参数为变量,建立了该结构耐撞性和轻量化优化问题的数学模型。运用方差分析法(ANOVA)选择对副车架侧边纵梁耐撞性和轻量化影响显著的结构因子作为主要设计变量,采用正交试验设计方法进行试验设计;运用LS-dyna软件进行碰撞模拟;根据有限元仿真结果建立了响应面近似模型,并对该近似模型解决该问题的可靠性进行了验证,结果表明,所建立的响应面近似模型适合解决组合优化问题。优化设计后的副车架侧边纵梁能在提高耐撞性能的同时,保持较好的轻量化水平。 相似文献
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Lightweight structure is an important method to increase vehicle fuel efficiency.High strength steel is applied for replacing mild steel in automotive structures to decrease thickness of parts for lightweight.However,the lightweight structures must show the improved capability for structural rigidity and crash energy absorption.Advanced high strength steels are attractive materials to achieve higher strength for energy absorption and reduce weight of vehicles.Currently,many research works focus on component level axial crash testing and simulation of high strength steels.However,the effects of high strength steel pans to the impact of auto body are not considered.The goal of this research is to study the application of hot forming high strength steeI(HFHSS)in order to evaluate the potential using in vehicle design for lightweight and passive safety.The performance of HFHSS is investigated by using both experimental and analytical techniques.In particular,the focus is on HFHSS which may have potential to enhance the passive safety for lightweight auto body.Automotive components made of HFHSS and general high strength steel(GHSS)are considered in this study.The material characterization of HFHSS is carried out through material experiments.The finite element method,in conjunction with the validated model is used to simulate the side impact of a car with GHSS and HFHSS parts according to China New Car Assessment Programme(C-NCAP)crash test.The deformation and acceleration characteristics of car body are analyzed and the injuries of an occupant are calculated.The results from the simulation analyses of HFHSS are compared with those of GHSS.The comparison indicates that the HFHSS parts on car body enhance the passive safety for the lightweight car body in side impact.Parts of HFHSS reduce weight of vehicle through thinner thickness offering higher strength of parts.Passive safety of lightweight car body is improved through reduction of crash deformation on car body by the application of HFHSS parts.The experiments and simulation are conducted to the HFHSS parts on auto body.The results demonstrate the feasibility of the application of HFHSS materials on automotive components for improved capability of passive safety and lightweight. 相似文献
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高床大客车侧翻结构安全性仿真研究 总被引:4,自引:0,他引:4
建立全承载高床大客车车身的有限元模型,并通过仿真试验初步验证其有效性。在此基础上研究大客车在翻滚过程中的耐撞性及其上部结构对侧翻安全性的影响,并参照相关法规对高床客车结构安全性进行了评估。最后根据仿真分析结果,提出上部结构的合理改进方法,进一步的仿真分析验证了结构改进能有效地提高高床客车的侧翻安全性。 相似文献
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Crashworthiness assessment of front side members in an auto-body considering the fabrication histories 总被引:2,自引:0,他引:2
H. Huh K. P. Kim S. H. Kim J. H. Song H. S. Kim S. K. Hong 《International Journal of Mechanical Sciences》2003,45(10):1645-1660
This paper is concerned with crash analysis of a front side member in an auto-body considering the effect of fabrication. The front side member is fabricated with sheet metal forming processes that induce forming histories such as plastic work hardening and non-uniform thickness distribution. Numerical simulation is carried out with LS-DYNA3D in order to identify the forming effect on the crashworthiness. The result shows that the crash analysis of the front side member with considering the forming history leads to a different result from that without considering the forming effect. The analysis calculated crash mode, the reaction force and the energy absorption for crashworthiness assessment with the forming effect. The analysis results demonstrate that the design of auto-body members should be carried out considering the forming history for accurate assessment of crashworthiness. 相似文献
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侧面碰撞中,汽车与假人接触的关键区域的变形历程对于研究侧面碰撞中假人的保护很重要但基本上难以通过测量得到。提出用仿真验证的方法反求侧面碰撞关键区域的变形时间历程。根据中国新车星级评价规程(CNCAP)侧面碰撞试验测量得到假人各部位的响应、侧面碰撞关键区域最终的变形以及碰撞动画,通过调整建立的侧面碰撞仿真模型中关键区域的变形时间历程,最终使仿真计算结果与试验结果接近一致。 相似文献