【摘要】 从研究的实用性和结构的可行性出发,建立较为精确的磁流变减振器动力学模型是设计控制策略和获得良好控制效果的关键因素之一。根据车辆悬架的各种要求,设计和分析磁流变减振器的各参数对阻尼特性的影响对于现代汽车设计来说是非常必要的。根据汽车减振的要求和磁路设计原则,设计出单输出杆阻尼孔式汽车磁流变减振器。基于流体力学理论和磁流变液流变特性,详细推导出磁流变减振器的阻尼力理论计算模型。对磁流变减振器的阻尼特性进行理论分析和计算,并探讨减振器各结构参数对减振器阻尼特性的影响。最后采用试验测试磁流变减振器的速度特性,得到不同电流输入时阻尼力与速度的关系曲线,试验测试的结果和理论计算基本吻合。采用流体力学理论推导出的磁流变减振器力学模型能为建立减振器控制模型提供可靠的理论指导。更多还原

【Abstract】 From the view point of practical research and feasible structure,the establishment of an accurate mechanical model for the magnetorheological damper is one of the key factors for designing control strategy to obtain good control effect.According to various requirements of the vehicle suspension,computation and analysis of the effects of all parameters of magnetorheological damper on the damping characteristic are necessary for the design of modern vehicles.According to the requirements of vehicle damper and the principle of magnetic circuit,a magnetorheological damper of single output bar and damping hole type is designed. Based on the fluid mechanics theory and the theological characteristics of magnetorheological fluid,a theoretical calculation model for the damping force of magnetorheological damper is deduced.The characteristics of the magnetorheological damper are analyzed and calculated,and the influence of the damper structural parameters on the damping characteristics is studied.The velocity characteristics of the magetorheological damper from the experiment are adopted and the damping force-velocity curves at different current outputs are obtained.The test results are in agreement with the theoretical calculation values.The mechanical model of magnetorheological damper deduced by adopting fluid mechanics theory can provide reliable theoretical direction for the establishment of the damper control model.更多还原