基于汽车座椅导轨试验模态的结合部刚度优化

摘要

Joint stiffness of the car seat rails determines the main dynamic characteristics of rails .Taking a certain type of car seat rails as the research object ,the finite element analysis and the modal test methods are used to optimize the joint stiffness .On the fi-nite element model ,several spring-damping elements are used to simulate the contact stiffness and damping between steel balls and guides .Taking the natural frequency of the test mode as the objective ,the spring stiffness as the design variables ,we set up an opti-mization model to optimize the contact stiffness with the software OptiStruct .The FEA model is rebuilt with optimized stiffness pa-rameters of guides ,the result shows that this method is reasonable and practical for building the joint model .%汽车座椅导轨结合部的刚度决定着导轨的主要动态特性.以某型号汽车座椅导轨为研究对象 ,运用有限元分析和模态试验方法对导轨结合部刚度进行优化.在导轨有限元模型中 ,用刚度阻尼单元模拟钢珠与导轨内外轨之间的接触.以试验模态固有频率作为目标 ,弹簧刚度作为设计变量 ,运用优化软件OptiStruct优化接触部的等效刚度.用优化后的等效刚度参数对导轨进行重新建模 ,结果表明该方法能够提高有限元动力学模型的建模精度 ,较好地解决了结合部建模时动力学参数的获取问题.