Investigation of Nonlinear Dynamic Phenomena Applying Real-Time Hybrid Simulation

摘要

Real-time hybrid simulation techniques have developed significantly in the last decades, driven by scientific research and steady progress in simulation and modeling techniques together with powerful automatic code generation tools. In engineering applications, hybrid simulation is mainly used for physical testing of critical components, while the remaining rest of the system is incorporated as computer model and properly coupled to the elements being tested. The focus of this research is to connect virtual nonlinear components with arbitrary characteristics to an existing mechanical model. This approach allows experimental verification of almost any classical nonlinear dynamic phenomena. The methodology can be applied for both, the optimal design of nonlinear components as well as testing of complex elements or materials based on experimental data, respectively. The laboratory setup comprises of standard hardware components used in modal testing including electrodynamic shakers, force, displacement and acceleration sensors and furthermore a real-time processing unit with feedback control for proper system coupling. For periodic forcing, the efficiency of the proposed method is demonstrated in a laboratory setup consisting of a rigid mass attached to a virtual nonlinear spring-damper element. All tests performed confirm the efficiency of the proposed system because nonlinear oscillations are reproduced with a very high level of accuracy.