共查询到18条相似文献,搜索用时 906 毫秒
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基于对客车侧翻过程的分析,为某款全承载客车提出了一种新型的侧翻缓冲吸能结构,分别建立了其原结构与改进结构的车身段封闭环侧翻分析模型,并进行仿真.结果表明,改进后结构各侧翻安全性评价指标均较原结构有所改善,车身结构侧翻安全性得到加强,有效地保证了乘员的生命安全. 相似文献
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提出了一种客车侧翻一步碰撞快速算法,利用该算法对某款长12 m的公路客车典型车身段进行了侧翻碰撞模拟,并与LS-DYNA仿真及侧翻试验结果进行了对比,结果表明,侧翻一步碰撞快速算法可以较好的预测客车结构的侧翻安全性能,其模拟结果与其它两种方法之间的误差小于15%,模拟时长约为LS-DYNA仿真的1/10,在基本保证计算精度的同时使得计算效率大幅提升。 相似文献
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客车车辆重心高、轮距窄,在紧急避让或高速超车易发生侧翻事故。建立三自由度名义模型,联立TruckSim非线性整车模型设计了基于横向动态载荷转移率预警系统和防侧翻系统,利用角阶跃工况联合仿真对设计系统进行验证。仿真结果表明:基于模糊PID控制能够有效改善客车行驶稳定性,降低客车侧翻风险。 相似文献
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对客车倾翻试验出口认证法规进行介绍;结合丰富的出口认证检测经验,为客车厂家进行倾翻试验提供参考;提出客车倾翻试验仿真分析的必要性。 相似文献
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《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2012,50(5):608-636
Recent data show that 35% of fatal crashes in sport utility vehicles included vehicle rollover. At the same time, experimental testing to improve safety is expensive and dangerous. Therefore, multi-body simulation is used in this research to improve the understanding of rollover dynamics. The majority of previous work uses low-fidelity models. Here, a complex and highly nonlinear multi-body model with 165 degrees of freedom is correlated to vehicle kinematic and compliance (K&C) measurements. The Magic Formula tyre model is employed. Design of experiment methodology is used to identify tyre properties affecting vehicle rollover. A novel, statistical approach is used to link suspension K&C characteristics with rollover propensity. Research so far reveals that the tyre properties that have the greatest influence on vehicle rollover are friction coefficient, friction variation with load, camber stiffness and tyre vertical stiffness. Key K&C characteristics affecting rollover propensity are front and rear suspension rate, front roll stiffness, front camber gain, front and rear camber compliance and rear jacking force. 相似文献
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Mohammad Ghazali Hassan Salarieh 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2017,55(1):121-148
In this paper vehicle path-following in the presence of rollover risk is investigated. Vehicles with high centre of mass are prone to roll instability. Untripped rollover risk is increased in high centre of gravity vehicles and high-friction road condition. Researches introduce strategies to handle the short-duration rollover condition. In these researches, however, trajectory tracking is affected and not thoroughly investigated. This paper puts stress on tracking error from rollover prevention. A lower level model predictive front steering controller is adopted to deal with rollover and tracking error as a priority sequence. A brake control is included in lower level controller which directly obeys an upper level controller (ULC) command. The ULC manages vehicle speed regarding primarily tracking error. Simulation results show that the proposed control framework maintains roll stability while tracking error is confined to predefined error limit. 相似文献