Multi-mode Active Vibration Control Using H_∞ Optimization MIMO Positive Position Feedback Based Genetic Algorithm

Author: Zhonghui Wu

Wu, Zhonghui, 2015 Multi-mode Active Vibration Control Using H_∞ Optimization MIMO Positive Position Feedback Based Genetic Algorithm, Flinders University, School of Computer Science, Engineering and Mathematics

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Abstract

In this thesis, experimental, analytical and numerical analysis three kinds of methods are used for distributed parameter plate structure modeling, an infinite-dimensional and a very high-order plate mathematical transfer function model is derived based on modal analysis and numerical analysis results. A feed-through truncated plate model which minimizing the effect of truncated modes on spatial low-frequency dynamics of the system by adding a spatial zero frequency term to the truncated model is provided and numerical software MATLAB is used to compare the feed-through truncated plate model with traditional balanced reduction plate model which is used to decrease the dimensions and orders of the infinite-dimensional and very high-order plate model. Active vibration control strategy is presented for a flexible plate structure with bonded three self-sensing magnetic transducers which guarantee unconditional stability of the closed-loop system similar as collocated control system. Both multi-mode SISO and MIMO control laws based upon positive position feedback is developed for plate structure vibration suppression. The proposed multi-mode PPF controllers can be tuned to a chosen number of modes and increase the damping of the plate structure so as to minimize the chosen number of resonant responses. Stability conditions for multi-mode SISO and MIMO PPF controllers are derived to allow for a feed-through term in the model of the plate structure which is needed to ensure little perturbation in the in-bandwidth zeros of the model. A minimization criterion based on the H_∞ norm of the closed-loop system is solved by a genetic algorithm to derive optimal parameters of the controllers. Numerical simulation and experimental implementation are performed to verify the effectiveness of multi-mode SISO and MIMO PPF controllers vibration suppression for the feed-through truncated plate structure.

Keywords: multi-mode vibration control, multi-input-multi-output vibration control, plate vibration control, multi-mode MIMO vibration control, multi-mode PPF controller, GA H_∞ optimizaion
Subject: Engineering thesis

Thesis type: Doctor of Philosophy
Completed: 2015
School: School of Computer Science, Engineering and Mathematics
Supervisor: fangpo he