Development of Hybrid Vibration Isolator by Inertial-Type Actuator and Wire Mesh Mount

Abstract

Hybrid-type mounts have been frequently developed as combining active vibration control techniques to predesigned passive mounts in order to increase equipment precision and to provide sufficient performance in extreme environments. Among various passive vibration isolation materials, wire mesh is regarded as a good candidate for reducing vibration due to its moderate material price, ease of machining, and long life cycle, without significant deterioration induced by aging or environmental effects. However, research on design, including wire mesh material, as a mount material, and the application of active control technology to its performance have rarely been conducted. In this paper, the method and procedure of an active hybrid mount design using a wire mesh material and inertial mass type actuator are proposed. Prior to designing a passive wire mesh isolator, the static and dynamic elastic modulus of wire mesh materials were experimentally extracted using simple shaped cylindrical specimens, and their characteristics relating to vibration isolator design were examined. From the experimental results of the simple shape specimens, density was determined to be the most important design factor, and the procedure for designing the passive component of the hybrid mount was proposed with density as the design factor. In addition, a procedure for designing an inertial mass type active vibration reduction device using a piezo actuator is also proposed with the goal of vibration reduction in equipment with periodic operation frequency, such as motors and pumps, and the vibration reduction effectiveness of the hybrid mount system was examined by simple two- and three-degree-of-freedom systems.