INFLUENCE OF FLEXIBLE FOUNDATION ON ISOLATOR WAVE EFFECTS

This article deals with the interaction between wave effects in mounts and resonances of foundations in flexible vibration isolation systems . A new model is proposed that is represented as a rigid mass supporte d by two linear unidirectional isolators on a flexible foundation beam , whose closed-form solutions for transmissibility and response ratio are then obtained, with which the influence of wave effects coupled wi th the flexibility of the foundation on the effectiveness of isolation is discussed. The wave effects an flexible isolation systems are anal yzed under various parametric conditions and compared with those in ri gid systems. In addition, several special cases are presented to show the transition between various limiting cases. Some approaches to cont rol wave effects are also proposed. (C) 1996 John Wiley & Sons, Inc.