Active Modal Control and Its Robustness Using Point Sensors and Point Actuators.

Abstract

This paper addresses the active modal control of a planar structure using point sensors/actuators designed to replace distributed sensors/actuators. It is the purpose of this paper to verify the capability of the modal control system experimentally. First, a modal control system for a general distributed structure based upon point sensors/actuators is designed. Then, the modal control of both an isolated mode and a degenerate mode is conducted, demonstrating a control effect for suppressing the targeted modal coordinate while exerting no influence on the others. It is found that even over-damping of the mode of interest is achieved without causing control instability. Moreover, by placing additional masses onto the planar structure, the robustness in modal filtering, modal actuation and modal control is investigated, showing a high degree of robustness.