MULTI-CHANNEL ACTIVE VIBRATION CONTROL IN ENGINE MOUNT ISOLATION SYSTEM
蘇富誠、吳建達
E-mail: 9126425@mail.dyu.edu.tw
ABSTRACT
THIS THESIS DESCRIBES AN ACTIVE VIBRATION CONTROL (AVC) SYSTEM FOR SINGLE-DEGREE-OF-FREE -DOM (SDOF) AND MULTIPLE-DEGREES-OF-FREEDOM (MDOF) ISOLATION PLATFORMS.THREE VARIOUS ACTIV -E VIBRATION CONTROL TECHNIQUES ARE COMPARED AND IMPLEMENTED IN TERMS OF CONTROL STRUCTURE -S AND CONTROL ALGORITHMS BY USING A FINITE-IMPULSE-RESPONSE (FIR) IN EXPERIMENTAL WORKS. THE ADAPTIVE FEEDFORWARD AND FEEDBACK CONTROL STRUCTURE USING FILTERED-X LEAST-MEAN-SQUARE (FXLMS) WITH SYNTHETIC REFERENCE IS EMPLOYED, THE LINEAR QUADRATIC GAUSSIAN (LQG) ALGORITHM WITH COMPENSATOR AND THE H-INFINITY ( ) OF ROBUST THEORY ARE APPLIED IN FEEDBACK CONTROL SYSTEM. A HYBRID CONTROLLER COMBINES THE
ADAPTIVE FEEDFORWARD WITH FEEDBACK ALGORITHMS OF LQG AND TO OBTAIN THE DESIRED ROBUST PERFORMANCE AND FAST CONVERGENCE IS PROPOSED. TWO CONTROL PLANT CONFIGURATIONS ARE IDENTIFIED BY A FREQUENCY-DOMAIN TECHNIQUE AND IMPLEMENTED BY USING A TMS320C32 DIGITAL SIGNAL PROCESSOR (DSP). EXPERIMENTS ARE CARRIED OUT TO EVALUATE THE PROPOSED SYSTEM FOR REDUCING THE VIBRATION OF ISOLATION PLATFORM AT VARIOUS CONTROL CONDITIONS. THE
COMPARISON OF THREE CONTROL STRUCTURES AND THREE ALGORITHMS FOR TWO ISOLATION PLATFORMS IS ALSO DESCRIBED IN THIS THESIS.
Keywords : ACTIVE VIBRATION CONTROL, ENGINE MOUNT SYSTEM, FINITE-IMPULSE-RESPONSE, DIGITAL SIGNAL PRO -CESSOR
Table of Contents
CHAPTER 1 INTRODUCTION 1.1 INTRODUCTION OF THIS STUDY--P1 1.2 LITERATURE REVIEW--P2 1.3
OVERVIEW OF THIS THESIS--P6 CHAPTER 2 THEORIES AND STRUCTURES OF ACTIVE VIBRATION CONTROL SYSTEM 2.1 ADAPTIVE FEEDFORWARD AND FEEDBACK CONTROL SYSTEM--P8 2.1.1 THE SDOF
FEEDFORWARD SYSTEM--P8 2.1.2 THE SDOF FEEDBACK SYSTEM--P10 2.1.3 THE MDOF FEEDFORWARD SYSTEM--P12 2.1.4 THE MDOF FEEDBACK SYSTEM--P15 2.2 LQG SYNTHESIS WITH COMPENSATOR--P17 2.3 ROBUST CONTROL THEORY--P21 2.4 HYBRID CONTROL SYSTEM--P25 CHAPTER 3 IMPLENENTATION OF CONTROLLERS AND EXPERIMENTAL VERIFICATION 3.1 EXPERIMENTAL VERIFICATION OF SDOF SYSTEM--P29 3.1.1 FXLMS ALGORITHM WITH SYNTHETIC REFERENCE--P32 3.1.2 LQG SYNTHESIS WITH COMPENSATOR--P35 3.1.3 CONTROL ALGORITHM--P38 3.1.4 HYBRID CONTROL--P41 3.2 EXPERIMENTAL VERIFICATION OF MDOF SYSTEM--P44 3.2.1 FXLMS ALGORITHM WITH SYNTHETIC REFERENCE--P47 3.2.2 LQG SYNTHESIS WITH COMPENSATOR--P53 3.2.3 CONTROL ALGORITHM--P57 3.2.4 HYBRID CONTROL--P61 CHAPTER 4 CONCLUSIONS--P66 REFERENCES--P69
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