Robust Control and Fidelity Assessment of Real-Time Hybrid Substructuring of Contact Problems

实时混合子结构(RTHS)是一种在真实条件下测试关键部件的方法，通常也称为机械层面的硬件在环(Hardware-in-Loop)。在试验台上对关键部件与之相互作用的动力系统进行了数值模拟，同时对部件本身进行了测试。力和位移信息在试验台上的部件和数值仿真中的其余系统之间实时交换。其目标是模拟整个动力系统的动态。该研究项目致力于RTHS的方法开发，以实现两个主要目标：第一，扩展现有的控制方法，使其能够测试具有接触的工程应用。当执行器运动时，RTHS容易失稳，实验部分引入了自身的动力学。现有的RTHS方法不能处理机械接触，因为被测动力系统的系统特性在接触瞬间发生快速变化。其次，需要评估RTHS测试的保真度。当执行RTHS测试时，全动态系统的参考动态行为不可用，因此不能直接确定RTHS测试复制真实动态行为的程度。使用耦合过程中的测量数据，将建立保真度评估。

Real-Time Hybrid Substructuring (RTHS, also often referred to as Hardware-in-the-Loop on mechanical level) is a method to test critical components under realistic conditions. The dynamical system with which the critical component interacts is simulated numerically while the component itself is tested on the test bench. Force and displacement information are exchanged between the component on the test bench and the remaining system in the numerical simulation in real-time. The goal is to emulate the dynamics of the overall dynamical system. This research project deals with method development for RTHS to achieve two main goals: Firstly, the existing control methods will be expanded such that engineering applications with contact can be tested. RTHS is prone to instability as the actuator moving the experimental part introduces its own dynamics. Existing methods in RTHS can not cope with mechanical contact, as the system properties of the dynamical system under test change rapidly at the moment of contact. Secondly, the fidelity of RTHS tests needs to be assessed. When performing RTHS tests, a reference dynamic behavior of the full dynamical system is not available and thus it is not straightforward to determine how well the RTHS test replicates the true dynamic behavior. Using the measurement data from the coupling procedure, a fidelity assessment will be set up.