時變梁結構振動控制之研究

Abstract

本論文旨在探討梁結構受到移動質量塊動態擾動時的振動控制，懸臂在受到質量擾動時為時變系統。由於壓電材料具有機械能與電能互換性質，故非常適合作為感測器與致動器。為了使質量塊在懸臂上往復運動，本實驗使用曲柄滑塊往復運動機構，藉著滑塊往復運動，連結懸臂上的質量塊，使質量塊達到運動效果。 實驗中將使用電荷放大電路作為控制器，分析控制器抑制振動之可行性，並比較控制器在使用相移器修正與否對振動抑制的優劣。在懸臂的擾動上，以時域響應討論質量塊在不同行程與不同速度的情況下對懸臂造成之影響。 論文部分，首先針對各個電路作分析，透過頻譜分析，瞭解電路響應是否為預期響應，確保控制器抑制振動之可行性。完成分析後，進行質量塊往復運動控制，驗證控制器在動態情況下是否可確實抑制振動。

This thesis aims at the dynamic response for the cantilever beam under a moving mass and use the piezoelectric material to be a sensor and a actuator. The beam under a moving mass is a time-varying system. Because the piezoelectric have the ability to transform electrical energy to mechanical energy and vice versa. For the purpose of putting a mass on the cantilever beam and can be reciprocating motion , the slider-crank mechanism was used. The control system will use a charge amplifier circuit to be a controller. And the analysis between use phase shifter to correct the signal or not will also be presented. Experiment results show the moving load velocity variation and it route variation will have an effect on the flexible beam. In this thesis, spectrum analysis will first be conducted to check the viability of the circuit. Eventually, use the circuit to control the dynamic system and verify the circuits whether or not suppress the vibration.