基于振动功率流法的汽车悬架系统隔振性能分析

Analysis of Vibration Isolation Performances of Vehicle Suspension System Based on Vibrational Power Flow Method

为优化衬套和车身车架的结构,建立汽车悬架系统衬套和减振器上端支撑的隔振分析模型,推导了各子结构间连接点处力和位移向量的表达式;在路面不平度激励下,运用振动功率分析方法,介绍了经由悬架各个衬套传递到车身车架的功率计算方法;以一麦弗逊悬架为例,利用ADAMS软件建立了其多体动力学模型,计算分析了在路面激励下经悬架衬套和减振器上端支撑传递到车身车架的功率,从而识别出振动能量传递的最大路径;最后,基于该方法分析了衬套特性对功率传递的影响,并就一液压衬套对车辆侧向激励引起的车身振动的衰减作用进行了分析.

In order to optimize the bushing and structure of vehicle body, a vibration isolation analysis model for the bushing and the top mount of vehicle suspension system is established, and the expressions of force and dis-placement vector at each join point between two substructures are decuced. Then, by using the vibration power transmission analysis method, a method is presented to calculate the power transmitting to the vehicle body under the road excitation through each bushings. Moreover, by taking a typical Macpherson suspension as the example, a multi-body dynamic model of the suspension is established with ADAMS software, and the power transmitting to the vehicle body through each bushing and top mount is calculated and analyzed, which helps to identify the maximum power transmission path. Finally, the influence of bushing characteristics on the power transmission is analyzed, and the effect of a hydraulic bushing on the vibration damping of vehicle body caused by the lateral excitation is dis-cussed.