Abstract
Dynamically substructured system (DSS) is one of the hybrid testing techniques, which decompose an entire system into numerical and physical substructures. Substructurability theory is proposed to analyze the feasibility and fidelity of testing methods, and substructurability quantifies the implementation efficiency of DSS tests. Successful tests require a robust controller to compensate for unwanted dynamics which produce by actuator systems to achieve synchronized responses of the numerical and physical outputs in real time and, most importantly, to predicts correct dynamic. However, it is noted that the dynamic properties of the substructures sometimes influence the synchronization stability and fidelity. For example, low damping coefficient might cause system unstable or testing inefficiency. Therefore, based on norm theory, the synchronization index and fidelity index are proposed, in order to evaluate the efficiency and robustness of DSS test in advance. We offer some embryo simulation in support of the indices. Accordingly, we could judge the behaviors of a system by substructureability index. When the index is unsatisfactory, this means the corresponding real-time dynamic test is not robust and inefficient. By contrast, when the index is ideal, the dynamic test is relatively stable and accuracy. The substructurability theory is contributive to interpret the dynamic limits of DSS and is helpful to search for reasonable solutions.