Abstract: This paper provides a method about fuzzy multi-objects optimization (FMO) in parameters of engine-mountings. In order to get better characteristics of engine-mounting system, three ways are considered as follows. The first way is assigning poles of the system to suit frequency characteristics of vehicle. The second way is making the system discoupling. The last way is reducing response at the mountings. Generally, every one of the sub-object functions which is constituted according to these ways is in conflict with others. Their optimal solution can not be found. In fact, FMO is the method by using which these conflicts can be coordinated and a satisfied solution having synthetic effects can be found. It has been verified through the practice of optimizing engine-mounting parameters of the DD-680 coach.

Key words: 发动机支承, 模糊集, 优化