动力系统悬置传递特性分析与应用

Analysis and Application of Transfer Characteristics of Power System Mounts

车辆行驶时,各结构运动件的振动相互影响,合理判断结构彼此影响的关系,是分析悬置隔振特性的前提。分析和总结以加速度为激励计算的传递特性规律,推导车辆实际运行时悬置传递特性,结合试验设计悬置件隔振特性计算流程,以独立动力系统激励试验、独立路面激励试验、实际稳态车速试验获得振源间的干涉成分、共频成分和相应比例;最后,通过实车试验测试与数据处理,获得动力系统悬置时域隔振特性。提出的方法能够有效地提高悬置隔振率和传递特性的评价精度,具有一定工程应用价值。

The vibrations of different kinematic components interact mutually in car traveling. Reasonably judging the interaction among the components is a necessary preliminary work for analyzing the characteristics of the suspension isolation system. In this paper, the vibration transfer characteristics with the acceleration as the excitation were analyzed and summarized. The mount transfer characteristic of the car in traveling was derived. Combining with experiment, the flow chart for the mount isolation characteristic computation was designed. The experiment scheme including independent power system excitation test, independent road excitation test, driving test at a constant speed was proposed to obtain the interference components, common frequency components and the corresponding proportions of the vibration sources. Finally, by the actual driving testing and data processing, the time-domain isolation characteristics of the power system mounts were obtained. The proposed method can effectively improve the evaluation precision of the mount system isolation and the transfer characteristics, and has a certain engineering application value.