動態次結構系統測試為複合測試中的一種方法，結合了數值法和全比例測試法之優點，將受測的工程系統拆解成數值模型和物理原型兩個子系統，受測系統中容易建模或是線性元件，在測試時利用數值模擬，而具非線性特性或是欲觀測其響應之元件，則實際搭建測試。次結構間藉由傳動系統作為連結，使其運作能與原先系統相同，然而，傳動系統之不理想動態會使得測試失真或是發散，因此需要透過設計控制器和濾波技術，避免訊號在數值次結構和物理次結構間傳遞失真，以確保測試的穩定性和可靠度。
動態次結構系統測試並非只有控制器設計的問題，許多文獻在實驗的過程中發現，若拆解後的數值或物理次結構之原生動態不理想，如系統中包含低阻尼或是極點靠近虛軸等，容易造成測試不穩定或是訊號同步性不佳，造成測試結果失真、不可靠、不易重複等問題。因此動態次結構系統測試前最關鍵的工作為「可次結構性」分析，目的為探討受測系統拆解後，實行動態次結構系統測試之可行性與性能表現，概念類似於控制系統中可控性與可觀測性。可次結構性內涵包括次結構間參數的配置、測試控制模態選定與傳動系統選擇的問題，本論文主要著重在多控制模態研究與分析。
控制模態主要可以分為「位移控制」和「力控制」兩種，兩者的差別取決於數值次結構是輸出位移或是輸出力以作用於物理次結構。本論文使用質量-彈簧-阻尼元件建構被仿真系統，在相同拆解情境但不同控制模態下，藉由動態分析、模擬和實驗方式，驗證兩種控制模態之測試可行性。經由一系列研究工作之比較與發現，在相同測試條件下，力控制模態可能提供更好的同步控制性與測試強健性，為動態次結構系統測試提供了一個不同的實踐方案，期望本研究之多控制模態分析理論，能使複合測試更廣泛應用於各式工程系統之動態測試。

Dynamically substructured system testing (DSS) is one of the hybrid testing techniques, which combines the advantages of numerical analysis testing and full-size testing method. The known linear parameters will be simulated in numerical substructured, while the critical unknown parameters may involve nonlinear behavior will be naturally tested in physical substructured. During the testing, the transfer system carries out the unwanted dynamic arises synchronization error and unsuccessful testing. Therefore, the controller design and filter techniques are crucial for successful testing in real-time.
However, the dynamic properties of the substructures sometimes influences the synchronization stability and its accuracy. For example, low damping coefficient might cause the system unstable or testing inefficiency. The purpose of substructurability is analyzing the feasibility of DSS implementation and its concept is similar to controllability and observability in control theory. The substructurability of DSS can be divided into the configuration of the parameters between two substructured, the control mode of testing and choose of transfer system. This thesis mainly focuses on the control mode of DSS research and analysis.
The control mode consists of displacement and force control, the main difference depends on whether the actuator is utilizing displacement or force imposed on physical substructured. We utilize MSD-D system to verify the feasibility of force control mode of DSS by simulation and experiment. Under the same test conditions, the force control mode has better synchronization and robustness to dynamic constraints and provides different selection for DSS testing. The DSS testing is expected to apply widely by its multiple control modes analysis theorem to different engineering system testing.

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