车载供氢系统振动优化有限元分析
首发时间:2020-02-27
摘要:根据自主开发的三瓶组车载高压氢系统模型,对比定频振动试验和有限元谱分析的位移幅值,反向确定了仿真模型中的系统阻尼比参数。通过有限元分析方法对结构进行随机振动分析,针对原有结构顶部振动剧烈,容易发生结构失效的薄弱点,在新开发产品中进行针对性的优化,对优化模型进行了仿真预测和样品试验验证。结果表明:车载高压氢系统的壳单元模型,能够满足模态分析和随机振动分析的要求;此类结构阻尼比适合确定为0.05;利用本文中的分析优化策略,在不增加车载高压氢系统重量的情况下,提高强度和刚度20%左右。
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FEM Analysis of Vibration Optimization for on-borad hydrogen supply system
Abstract:According to the self-developed On board hydrogen system, damping ratio of the structure is determined by comparing displacement amplitudes between the vibration test under particular frequency and the harmonic analysis of FEA (finite element analysis).Then FEA method is used to analyze the random vibration of the hydrogen system. The vibration of the top of the original structure is severe, and the weak points of structural failure are easy to occur. A new system is developed to solve a problem that the vibration of the original structure is severe. Finally, Finite Element Analysis of Vibration Optimization for on-borad hydrogen supply systemthe new system results of FEA method and the vibration test are compared. The results show that the shell element model of the vehicle high-pressure hydrogen system can meet the requirements of modal analysis and random vibration analysis. Damping ratio of the structure is determined as 0.05. The strength and stiffness of vehicle high-pressure hydrogen system can be increase by 20% without the weight increment, when the FEA optimization strategy is applied.
Keywords: On board hydrogen system finite element method random vibration damping ratio
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