Hybrid active and passive control of vibratory power flow in flexible isolation system

A hybrid active and passive vibration control strategy is developed to redu ce the total power Rows from machines, subject to multiple excitations, to supporting flexible structures. The dynamic interactions between machines, controllers, and receiving structures are studied. A force feedback control process governed by a proportional control law is adopted to produce activ e control forces to cancel the transmitted forces in the mounts. Computatio nal simulations of a simple and a multiple dimensional hybrid vibration iso lation system are performed to study the force transmissibility and the tot al power flows from vibration sources through active and passive isolators to the supporting structures. The investigation focuses on the effects of a hybrid control approach to the reduction of power Row transmissions and th e influence of the dynamic characteristics of the control on power Row spec tra. The hybrid control mechanism is synthesised from the power Row analysi s. Conclusions and control strategies, well supported by numerical simulati ons, are deduced providing very useful guidelines for hybrid vibration isol ation design.