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 the point sensors / actuators designed to replace the distributed sensors / actuators regarded as an ideal sensor / actuator.It is the purpose of this paper to verify the capability of the active 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 an isolated mode as well as a degenerate mode is conducted, demonstrating the control effect for suppressing the targeted structural mode while exerting no influence on the the others.It is found that even an over-damping state of the mode of interest is possible without inducing control instability.Moreover, by placing additional"lead"masses onto the planar structure with a view to varying modal parameters of the structure, the robustness in modal filtering, modal actuation and modal control is investigated, demonstrating a significant robustness of the active modal control system.