Actuator with Built-In Viscous Damping for Isolation and Structural Control

摘要

The development and experimental application of an actuator with built-in viscous damping are described. A passive damper was modified to create a novel actuation device for two applications: isolation and structural control. The device uses the same fluid for damping and as a hydraulic lever for a voice coil actuator. For vibration suppression, active enhancement of the inherent passive damping can optimize broadband damping or target certain frequencies. For vibration isolation applications, the passive stiffness can be chosen for small gravity sag and the active control designed to provide reduced mount transmissibility over a broad- or narrow-frequency range. Lumped parameter models capturing structural and fluid effects are presented.