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简要介绍了封闭式汽车驱动桥总成可靠性试验台的试验原理,并分析了动力布置与功率流的方向、系统功率损失的关系,从而得出最优动力装置的布置方案。 相似文献
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In this paper, a numerical procedure to estimate the performance of the high power pretensioner used in the seatbelt of a
passenger vehicle is presented. The data on the gas explosion pressure in a 10-cc volume and the data on the displacement
of the rack according to time were applied to the numerical procedure. The procedure was implemented using MATLAB. The testing
device, which met the automobile industry standards, was created. Experiments were carried out seven times under the same
conditions, and the mean values of the web retraction and belt load were used as the representative data. By comparing the
simulation results to the test results, the numerical procedure presented in this paper was verified. 相似文献
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本文探讨FR式汽车动力传动系扭振的局部模态及其主导子结构和半轴子结构对称分支的模态对称性与模型简化问题,在这两方面取得了一些新的认识,有助于对这类汽车动力传动系扭振分析模型的合理简化和对扭振特性的深入认识。 相似文献
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为了解决纯电动汽车动力性和操控性难以同时兼顾的问题,将驾驶员意图分为稳态意图和动态意图,稳态意图用于保证车辆的操控性,动态意图用于保证车辆的动力性,在此基础上提出了一种基于驾驶员意图识别的纯电动汽车动力性驱动控制策略,该策略首先分别采用“典型工作点+分段插值”和模糊推理方法来识别驾驶员的稳态和动态意图;接着采用“动态补偿转矩保持”和“动态补偿转矩归零”等算法计算动态补偿转矩;最后通过“增量式”动态补偿转矩跟踪算法和电机过载管理算法给出最终的转矩指令。仿真与试验结果表明,该策略既可以根据驾驶员稳态意图保证车辆的操控性,也可根据驾驶员动态意图提高车辆的动力性。 相似文献
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在某轿车原扭力梁后桥的基础上,建立了扭力梁式后桥的结构力学模型,具体分析了原车后桥的模态及在静止、制动或启动及侧翻工况下的强度。在此基础上进行原车后桥的拓扑结构轻量化设计,通过在原后桥的基础上获得后桥空间设计域及非设计域,定义设计目标、设计函数、加载条件及响应,迭代计算获得了最佳的结构拓扑方案。根据结构拓扑优化的最终结果,通过CAD重构获得了拓扑结构轻量化的后桥设计。模态及强度计算结果显示,优化后的后桥前三阶模态频率较原后桥有大幅减小,不同工况下后桥的应力分布更趋合理,在设计域内及安装位置不变的条件下,新后桥的质量由原后桥的19.06 kg减少到17.67 kg,减重7.29%。 相似文献
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在比较PG等级三种算法的基础上,推荐使用长期路用性能计划(LTPP)的计算公式进行结合料的PG等级确定。结合内蒙古各地区的气象资料,给出各主要地区的沥青结合料等级,指出在结合料选择过程中应注意的主要问题。 相似文献
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本文综合应用结构有限元分析,疲劳寿命估算和室内道路模拟试验技术对某型汽车后桥壳的垂直弯曲疲劳强度进行了分析,评价。 相似文献
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本文叙述了50t平板车中桥桥壳弯曲载荷、半轴扭矩工作载荷谱测定方法及其试验程序载荷谱的编制方法。运用“浮动零线法”解决了测试时载荷的“直流分量”和“交流分量”的比例问题。并对8级程序载荷谱中如何计算每级的循环次数提出了近似的计算方法。 相似文献
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分别采用矩阵法和实体模型仿真法对DY90型发动机的曲柄连杆总成进行动力学仿真,并将结果与传统的惯性力激振理论作对比,通过对进一步实验所得数据进行分析以验证各仿真方法的合理性. 相似文献
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(上接2007年第4期) 通过matlab编程,求解以上方程组的simulink框图如图3所示.图中所有长度单位均为m,质量单位均为kg,Omega代表ω,Theta代表θ, -dot代表上标黑点,即求导. 相似文献
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H. S. Heo S. J. Bae H. K. Lee K. S. Park 《International Journal of Automotive Technology》2012,13(2):167-173
In a conventional MPI engine, a pulsation damper is usually mounted on the fuel rail to diminish undesirable noise in the
vehicle cabin room; however, pulsation dampers are quite expensive. Therefore, several studies have focused on reducing fuel
pressure pulsation by increasing the self-damping characteristics of the fuel rail. This paper details the development of
a fuel rail that reduces pulsation using a self-damping effect. Using an oil hammer simulation technique, pressure pulsation
characteristics were investigated with respect to the aspect ratio of the cross-section, wall thickness, and fuel rail material.
Increasing the aspect ratio and decreasing the wall thickness efficiently reduced the pressure pulsation. In addition, the
pressure pulsation characteristics were investigated with respect to the resonant engine speed and injection period. These
simulated data can be used to reduce the pressure pulsation peak and to avoid the resonant point in the design stage during
the development of a fuel rail. 相似文献
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低载强化特性在轿车后桥耐久性试验载荷谱处理中的应用 总被引:1,自引:0,他引:1
主要研究用于轿车后桥耐久性试验载荷谱的优化处理方法.根据材料的低载强化特性,综合考虑了无效载荷的评价原则,既有效地保存了具有损伤效果的大载荷,又保存了具有强化效果的小载荷,避免了以律只要是小载荷就全部删除的误区,使得台架模拟更加实际的疲劳寿命. 相似文献
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L. F. P. Etman R. C. N. Vermeulen J. G. A. M. Van Heck A. J. G. Schoofs D. H. Van Campen 《Vehicle System Dynamics: International Journal of Vehicle Mechanics and Mobility》2003,38(2):85-101
Summary A stroke dependent damper is designed for the front axle suspension of a truck. The damper supplies extra damping for inward deflections rising above 4 cm. In this way the damper should reduce extreme suspension deflections without deteriorating the comfort of the truck. But the question is which stroke dependent damping curve yields the best compromise between suspension deflection working space and comfort. Therefore an optimization problem is defined to minimize the maximum inward suspension deflection subject to constraints on the chassis acceleration for three typical road undulations. The optimization problem is solved using sequential linear programming (SLP) and multibody dynamics simulation software. Several optimization runs have been carried out for a small two degree of freedom vehicle model and a large full-scale model of the truck semi-trailer combination. The results show that the stroke dependent damping can reduce large deflections at incidental road disturbances, but that the optimum stroke dependent damping curve is related to the acceleration bound. By means of vehicle model simulation and numerical optimization we have been able to quantify this trade-off between suspension deflection working space and truck comfort. 相似文献