共查询到15条相似文献,搜索用时 250 毫秒
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本文研究了一种汽车座椅头枕性能测试冲击试验机弹射系统,应用热力学和空气动力学的基本理论,对该系统弹射过程建立了数学模型,并以MSC.ADAMS为仿真平台,对其进行了动态特性性能仿真分析,结果表明该配置能较好的满足冲击试验机的测试要求。这对了解该设备的性能和实际应用提供了重要依据。 相似文献
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为满足法规GB15083-2006要求,设计安全优质的后排座椅骨架结构。应用Hypermesh前处理器对某款车型建立座椅行李箱冲击试验的有限元模型,并利用Ls-dyna求解器对冲击过程进行仿真分析。分析结果表明该座椅在行李箱冲击试验中不满足法规要求。选取行李箱冲击后排座椅过程中变形量较大的靠背管并对其结构进行优化。提出了将靠背管横截面由圆形改进为椭圆形和将靠背管改进为钣金件两种方案。通过分析优化后座椅靠背管应力、应变最大值以及座椅头枕及靠背与评判面之间的距离,在轻量化的前提下选定方案2为最优。该方案提升了后排座椅的抗冲击能力,座椅头枕及靠背与评判面之间的距离曲线峰值明显降低,座椅结构满足法规要求。 相似文献
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针对某轿车座椅在动态冲击台架试验中出现结构断裂的现象,建立了该座椅的几何模型和有限元模型.基于该数字模型,结合理论分析和仿真分析,找出了在试验中出现失效问题的原因,并对其进行了改进设计,结果证明改进方法准确有效,并满足了试验要求. 相似文献
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Mingming Xing Xiaoguang Li Kaifeng Xue Chengmao Zhang Zongxiang Hou 《Journal of Mechanical Science and Technology》2020,34(4):1485-1493
The stability of a high clearance sprayer (HCS) can be considered in developing modern agriculture. We built a three-dimensional dynamics model of HCS with road excitation considering the influence of complex terrain on the whole vehicle vibration. The numerical simulation method was proposed to solve differential equations based on the Newmark-ß method. The response curves of whole vehicle in the time and frequency domain response were analyzed. The simulation results show that the vibration amplitude difference of left and right wheel is bigger than amplitude difference of right and rear wheel. The average amplitude of roll motion is bigger than pitching motion. The reason is that since the man-machine seat is set on the left of whole vehicle, an additional roll torque is brought. Besides, the displacement amplitude of whole vehicle is bigger than man-machine seat. The reason is that the vibration absorption system of seat can reduce vibration effectively. In amplitude-frequency response curves, the multiple resonance points occur with the road excitation given in this paper. The maximum response amplitude of angle velocity and acceleration of pitching motion is bigger than roll motion. This study has an important theoretical and practical value for structure dynamic optimization of HCS. 相似文献
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基于多体系统动力学的方法理论,应用ADAMS软件建立前起落架和主起落架的动力学仿真模型,并且以此为基础建立全机的动力学虚拟样机模型,对飞机弹射起飞过程进行仿真分析,并针对不同飞机起飞质量和弹射力,对比分析了其对起落架动力学响应及全机起飞性能的影响,结果表明:应用ADAMS对飞机起落架结构进行动力学仿真分析对起落架设计能提供必要的依据,减小飞机起飞质量以及增大弹射力,能够有效提高飞机弹射起飞性能。 相似文献
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根据联合国欧洲经济委员会制定的UN R129法规儿童约束系统(CRS)台车侧面碰撞条件,提出了2种台车侧面碰撞仿真试验方法,并验证了其可行性。基于该试验方法,采用Q3儿童假人,建立3种不同CRS(五点式-成人安全带固定(三点式CRS),五点式-ISOFIX固定,前护板型-成人安全带固定)的侧面碰撞数值分析模型。分析了儿童乘员的运动学响应和头、颈部及胸部的损伤物理参数。结果显示:儿童乘员在不同类型的CRS中的运动学响应不同。ISOFIX固定条件下儿童头部损伤风险较大,除三点式CRS约束条件下的儿童乘员损伤物理参数接近耐受极限值外,其他2种工况下的儿童乘员的胸部合成加速度(3ms)和上颈部弯矩值均超过儿童乘员耐受极限值,可见在侧面碰撞中儿童乘员的胸部和颈部损伤风险较大。 相似文献
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KEY TECHNIQUES OF MULTI-BODY MODELING OF OCCUPANT RESTRAINT SYSTEM OF VEHICLE SIDE IMPACT 总被引:1,自引:0,他引:1
ZHANG Junyuan ZHANG Min DING Rufang Automotive College Jilin University Changchun China QIU Shaobo ZHANG Yu LI Hongjian Research Design Center China First Automobile Group Corp. Changchun China 《机械工程学报(英文版)》2006,19(3):396-400
Based on multi-body dynamics, the simulation models of auto-side structures and occupant's dynamic responses are set up, using the occupant injury simulation software MADYMO3D. These models include auto-body structure, impact barrier, seat and dummy. Definitions of multi-body and joints and dynamics properties of joints based on FE combination models, of model setup are introduced. Kelvin element of MADYMO is introduced to show the force action between non-adjoining rigid bodies, too. Then all examples of the methods mentioned are given. By the comparison of simulation and real test, the contract curves between simulation and real test for main structures and biology mechanics properties of dummy are obtained. The result shows the accuracy and validity of the models. 相似文献