ACTIVE CONTROL OF ENERGY FLOW FROM SOURCE TO EQUIPMENT ON A SANDWICH PANEL

摘要

The dynamical behaviour of a complex active / passive / hybrid vibration control system is investigated. This consists of a vibration source and sensitive equipment mounted on a flexible sandwich panel with sky-hook controllers attached. A power flow progressive approach is used to model and analyse this system. Three active feedback control strategies are investigated taking into account the dynamics of the sandwich base structure. The kinetic energy and time averaged power flow transmissions on all the interfaces between substructures of the system are evaluated and control efficiencies are compared for different control schemes. Numerical simulations demonstrate that active sky-hook controllers mounted on the sandwich panel efficiently dissipate the vibration energy and reduce power transmissions from the machine via the sandwich panel and onwards to the equipment. As a passive control measure, increasing the damping ratio of the core material of the sandwich panel reduces the resonant peaks of power flow spectra, especially to the equipment. This study provides a theoretical basis for vibration control design of lightweight structures.