动力总成悬置支架性能计算及试验研究

发布时间：2018-06-01 15:35

本文选题：悬置支架 + 有限元分析　；参考：《沈阳航空航天大学》2016年硕士论文

【摘要】：汽车动力总成的振动是汽车首要的振动源之一,发生的振动经由车架传递到驾驶室内,影响乘员乘坐的舒适性和汽车的NVH特征。悬置支架能最大量隔离发动机产生的振动传递至汽车本身,可以使驾驶室内乘员乘车时更加舒适。一方面,悬置支架是安全件和连接件,必须有足够的强度去保证动力总成安全地装配于车身上;另一方面,悬置支架必须有较高的模态,避免与动力总成或车身产生共振现象。因而,合理地设计与安装悬置支架是汽车动力总成悬置系统研发的主要组成部分。首先,本文针对某款轿车变速箱后拉杆安装支架在道路试验中失效的现象进行合理有效的分析,并分别对悬置系统进行数学模型与力学模型的建立,利用多体动力学仿真软件ADAMS分析得到悬置系统的载荷数据,进而借助仿真分析软件HyperMesh、MSC.Nastran和HyperView对支架的模态与应力进行分析,判断其是否满足产品要求。其次,使用仿真分析HyperWorks板块中Optistruct单元,采用拓扑优化技术将初步设计的支架结构进行优化分析,以获得强度最好的结构方案。依照研发的优化方案变动支架的布局,最终生产出性能最优的产品。最后,对优化后的支架通过MTS试验台进行疲劳和破坏试验来验证此优化方案对该悬置支架性能的提升是有效的。最终通过装车试验,对优化后的支架NVH各项性能及各个工况进行评测,试验结果符合要求,且支架完好无损。得出实验数据供整车厂开发新款悬置系统使用,有效地证明了此优化方法的正确性。本文的研究方法和设计思路也可用于汽车上的其他零件设计。
[Abstract]:The vibration of the automobile power assembly is one of the most important vibration sources of the car. The vibration is transmitted to the driving room through the frame, which affects the comfort of the passenger and the NVH characteristics of the car. The mounting bracket can transmit the vibration from the engine to the car itself, which can make the occupant more comfortable in the cab. On the one hand, The mounting bracket is a safety piece and a connector and must have enough strength to ensure that the power assembly is safely assembled on the body; on the other hand, the mounting bracket must have a high mode to avoid resonance with the power assembly or the body. Therefore, the rational design and installation of the mounting bracket is the main research and development of the automotive powertrain suspension system. In order to make up part. First of all, this paper makes a reasonable and effective analysis on the failure phenomenon in the road test of the rear pull rod installation support of a certain type of car transmission, and establishes the mathematical model and mechanical model of the suspension system respectively, and uses the multi body dynamics simulation software ADAMS to analyze the load data of the suspension system, and then with the aid of imitation. The true analysis software HyperMesh, MSC.Nastran and HyperView are used to analyze the modal and stress of the scaffold and determine whether it meets the requirements of the product. Secondly, the Optistruct unit in the HyperWorks plate is simulated and analyzed by using the topology optimization technique to optimize the preliminary design of the scaffold structure to obtain the best structural scheme. Finally, the optimized support through the MTS test bench fatigue and failure test to verify that the optimization scheme is effective to improve the performance of the suspension support. Finally, through loading test, the performance of the optimized support NVH and the various working conditions. The test results conform to the requirements and the support is in good condition. The experimental data is obtained for the use of the new suspension system for the development of the whole vehicle plant, which effectively proves the correctness of the optimization method. The research methods and design ideas of this paper can also be used in the design of other parts on the car.
【学位授予单位】：沈阳航空航天大学
【学位级别】：硕士
【学位授予年份】：2016
【分类号】：U464.13

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