Comparative Study of Robust Controllers for Vibration Control of Flexible Structures by Combining Pre-Compressed Layer Damping and ACLD Treatment

. It is well known fact that system parameters of the flexible structures keep on changing due to several reasons. Ordinary controllers loose their effectiveness in changed situations and do not guarantee the stability of the closed loop system. However, controllers designed based on robust control theory, not only maintain the closed loop stability of the perturbed system with a large variation in system parameters but also maintain the best performance.  H Loop shaping controller is designed and implemented on a smart flexible structure treated with precompressed layer damping and ACLD treatment. It outperforms Linear Quadratic Gaussian and standard  H controller both in terms of robust stability and robust performance. Relative merits and demerits of the μ – synthesis based controller are also discussed.