动力总成--悬置系统振动解耦设计方法

动力总成-悬置系统获得良好隔振性能的主要方法是最大限度地解除其多自由度振动耦合.在论述动力总成关于曲轴坐标系、转矩轴坐标系和主惯性轴坐标系的振动解耦原理的基础上,进行了动力总成-悬置系统的弹性解耦特性分析,探讨了对于前、后悬置均采用V形悬置组的振动系统易于达到的弹性解耦程度;提出了V形悬置组布置设计的最小刚度比约束条件和悬置倾角的选择范围,完善了V形悬置组的设计方法.这些概念和设计方法拓展了动力总成-悬置系统的弹性解耦设计理论.

DESIGN METHOD FOR VIBRATION UNCOUPLING OF POWERPLANTMOUNTING SYSTEM

The most effective way for powerplant-mounting system to obtain excellent vibration isolation performance is to uncouple the multi-degree-of-freedom vibrations as much as possible. Based on the discussion of three uncoupling schemes for powerplant-mounting system under three different coordinates, i.e., crankshaft coordinate, torque-roll-axis coordinate and principal-mass-moment-of-inertia coordinate, the elastic uncoupling characteristics of the system are analyzed, and the best elastically uncoupling performance of the system with V-formed mounting pairs at the front and rear ends of the powerplant is predicted, which is that only two nonzero coupling stiffness are left. Then the lower limit for the principal stiffness ratio and the range of possible V-angle of V-formed mounting pair are revealed for elastic uncoupling between lateral and roll directions. Thus the design method for V-formed mounting pairs is further perfected. The concepts and methods presented here for design of elastically uncoupling mounting systems represent a significant progress in powerplant vibration isolation theory.