Optimal vibration control of smart fiber reinforced composite shell structures using improved genetic algorithm

Published Date

9 January 2009, Vol.319(1):15–40, doi:10.1016/j.jsv.2008.05.037

Author 

• Tarapada Roy
• Debabrata Chakraborty ^,

• Department of Mechanical Engineering, Indian Institute of Technology Guwahati, Guwahati 781039, India

Received 18 February 2008. Revised 16 May 2008. Accepted 24 May 2008. Available online 17 July 2008. Handling Editor: J. Lam

Abstract

In the present article, an improved genetic algorithm (GA) based optimal vibration control of smart fiber reinforced polymer (FRP) composite shell structures has been presented. Layered shell finite elements have been formulated and the formulation has been validated for coupled electromechanical analysis of curved smart FRP composite structures having piezoelectric sensors and actuators patches. An integer-coded GA-based open-loop procedure has been used for optimal placement of actuators for maximizing controllability index and a real-coded GA-based linear quadratic regulator (LQR) control scheme has been implemented for optimal control of the smart shell structures in order to maximize the closed-loop damping ratio while keeping actuators voltages within the limit of breakdown voltage. Results obtained from the present work show that this combined GA-based optimal actuators placement and GA-based LQR control scheme is far superior to conventional active vibration control using LQR schemes and simple placement of actuators reported in literatures. Results also show that the present improved GA-based combined optimal placement and LQR control scheme not only leads to increased closed-loop damping ratio but also shows a drastic reduction in input/actuation voltage compared to the already published results.

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