本研究旨在設計一簡易的週期扭振吸振器(TPVA)能輔助主結構抵抗週期扭力負荷。主結構在實務上經常承受週期負荷，在數學上週期扭力負荷可視為一倍頻負荷的組成，現今發展的吸振器皆以吸收單頻或寬頻振動為主，罕見針對倍頻振動的吸振器。吾人採用數個環形質塊與數個扭力彈簧結合成一可吸收週期扭力負荷的吸振器，並應用接納法推導TPVA之頻率方程式，繼而求解此方程式可獲得製作TPVA的參數。
文中將設計的TPVA裝置於一軸上，當軸承受一週期扭力負荷時，從數值結果可觀察出TPVA能有效地吸收扭力負荷的能量，進而減低負荷對軸的損害。文末製作TPVA的實體模型裝置於主系統上，期以實驗驗證其減振效應，並作為理論與模型修改之依據。上述研究的成果除提出一創新吸振器的設計外，亦可提供工程人員結構減振之重要資訊。

The purpose of this thesis is to design a simple system of Torsional Periodic Vibration Absorber (TPVA) which is mounted to a primary structure to resist external excitation. Machines are often subjected to periodic excitation in industrial applications. A periodic excitation has a peculiar feature that it is in terms of waves of multiple frequencies after Fourier series expansion. Traditional dynamic vibration absorber (DVA) is usually designed for a tonal frequency to either avoid structure resonance or absorb external forcing. It is obviously insufficient to attenuate multiple frequencies excitation. The designed TPVA consists of four ring-masses and eight torsional springs. The frequency equation of TPVA is derived from the receptance method. Solving the frequency equation which is derived via sensitivity analyses, and the absorber’s parameters can be calculated. Based on calculated details, first three natural frequencies of the TPVA are in integer multiples of the basic frequency. Finally, the periodic responses of the primary system with/without designed TPVA are examined numerically and experimentlly. A satisfactory and consistent accuracy between theory and experiment is arrived. The TPVA is believed to provide an efficient and effective tool for suppressing periodic vibration in primary structure. The developed absorber is helpful to the audience in vibration absorption.

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