動態次結構測試法為混合測試法其中一種，同時具有數值模擬的方便性與物理元件的真實性，將待測系統中欲測試部分以實際物理元件搭建，其餘部分建模於電腦中，能實際搭建待測系統中任一部分，且以系統原尺寸進行測試，真實貼近物理元件動態行為，同時數值模擬則降低了實驗所需空間與成本，使動態次結構測試成為有效率的工程結構測試法。成功的動態次結構測試需要達成數值與物理兩次結構之接觸面輸出響應一致，運行如未拆解前系統，但物理次結構中伴隨機械致動元件而來的不理想動態破壞了輸出響應間的同步，此時我們需要優良且強健的控制器來確保測試成功。本研究將從文獻中提出三種控制策略，包含(i)仿真系統基礎、(ii)數值次結構基礎與(iii)輸出基礎控制策略，分析其優缺點，找出最適合即時動態次結構測試法之控制策略。前兩種控制策略將搭配動態基礎設計出典型的相位補償控制器；而輸出基礎控制策略則是採用幾何基礎，依據前向預測與曲線配適概念設計出時間延遲補償控制器。
本論文將使用一組單輸入單輸出的質量彈簧阻尼系統做為實例，從控制器設計過程即開始控制策略之比較，並在常態與干擾條件下觀察三種控制策略之表現，分析其優缺點與強健性，最後從設計過程、實驗與模擬表現皆得出相同結果，典型相位補償控制器能提供較佳的控制表現與穩定性，而幾何基礎控制器因無考慮系統動態特性，並不適用於即時動態次結構測試法。

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