汽车座椅聚合物泡沫座垫非线性弹性-阻尼特性建模研究  

A MODELING METHOD FOR NONLINEAR ELASTIC-DAMPING CHARACTERISTICS OF AUTOMOBILE SEAT CUSHION

作　　者：陈娜娜[1] 吕振华[1] 

机构地区：[1]清华大学汽车工程系,汽车安全与节能国家重点实验室,北京100084

出　　处：《工程力学》2013年第4期402-409,共8页Engineering Mechanics

基　　金：国家“863计划”基金项目(2006AA110104)

摘　　要：该文探讨了汽车座椅聚合物泡沫座垫的非线性弹性-阻尼特性的一种建模方法及过程。首先进行了泡沫座垫的动态力学特性实验测试,根据座垫的非线性动态特性特征选择了模型的表达式,再通过大量实验数据对其进行了参数辨识,建立了座垫的一种非线性弹性-阻尼特性数学模型,表达了座垫的动态载荷与变形位移、速度的关系。另一方面,进行了实际人体在座垫上的正常坐姿体压分布测试,参考体压分布状态进行了座垫的离散化,建立了泡沫座垫的垂向非线性弹性-阻尼特性的离散化模型,可更好地模拟座椅-乘员系统的人体角振动响应特性。最后进行了所建立的聚合物泡沫座垫动态特性模型在座椅-乘员系统多体动力学响应模拟分析中的应用验证。For polymer foam cushion of automobile chair,a modeling method and process of nonlinear elastic-damping characteristics are analyzed.Firstly,a dynamic characteristic test of the polymer foam cushion is carried out.A mathematic model expression is determined according to the nonlinear dynamic characteristics of the cushion,and the model parameters are identified based on a series of experimental data.Thus,a nonlinear elastic-damping model of chair cushion is created,and a relationship of dynamic load vs.deforming displacement and velocity of the cushion is acquired.Meanwhile,an experimental measurement of pressure distribution of human body to seat cushion is carried out.According to the body pressure distribution,a distributed model of vertical nonlinear elastic-damping characteristics of chair cushion is derived,in which the angular vibration response characteristics of human body can further be simulated.Finally,a simulation analysis on dynamic response of the seat-occupant multi-body system is evaluated by taking advantage of the proposed dynamic model of the polymer foam cushion.

关 键 词：汽车座椅 聚合物泡沫座垫 非线性弹性-阻尼特性 建模研究 实验 

分 类 号：U461[机械工程—车辆工程]