本文主要目的為探討狀態變換壓電吸振器對於懸臂樑受到一外力後之減振特性分析。文中將壓電材料貼附樑表面上並且外接適當的電子電路，形成一對於系統具減振效果的狀態變換壓電吸振器。在電路部分以標準式被動壓電吸振器之電路並聯一個二極體電路，當樑受外力激振產生振動時，二極體電路會有導通與不導通互相變換的情況，即為狀態變換壓電吸振器。 首先假設外力，其頻率與樑振動頻率相等。分析狀態變換壓電吸振器(the state-switched piezoelectric dynamic absorbers)的基本特性，找出較佳的參數組合。其次再將此狀態變換壓電吸振器用於懸臂樑受到衝擊力時的減振分析，並與實驗結果比對。 This thesis attempts to explore the vibration reduction of a cantilever beam subject to the external force by using the state-switched piezoelectric absorbers. A state-switching piezoelectric absorber consists a piece of piezoelectric material and an appropriate electric circuit which includes a diode. When the beam is vibrating, the electric voltage on the diode can determine the on-off status of certain circuit. Thus, this specific type of absorbers is called the state-switching piezoelectric absorbers. First, an external harmonic force with its frequency same as the natural frequency of the beam is used. Numerical data show a good reduction effect can be achieved by using the state-switching absorbers. Then, an impact force is applied to the beam. The designed absorber can give satisfactory reduction to the beam vibration by observing both of numerical and experimental results.
