Experiment and Simulation Research on Synchronization Control of Shaking Tables System Based on Adaptive Sliding Mode Controller

Background Electro-hydraulic shaking tables system is used in many vibration tests to replicate earthquake motion to evaluate structural performances and potential problems under actual vibrations. However, the synchronization and tracking control performance is unsatisfactory due to system uncertainty and external disturbance. Purpose An adaptive sliding mode control (ASMC) for electro-hydraulic shaking tables system is proposed to improve system control performance in this paper. Methods The system's hydraulic model, dynamic model and control model based on degree of freedom (DOF) control and cross-coupled control (CCC) are built and the main influence factors to the control performance are analyzed. The proposed ASMC adopts a novel adaptive reaching law to the sliding mode controller (SMC) to improve the system response performance and reduce the system chattering by estimating the unknown parameters. The proposed ASMC is then introduced to CCC to improve the synchronization control performance. Results The simulation model is built and the experimental system is designed applying xPC target rapid prototype control technology and then multiple simulation and experiment tests are performed. Conclusion The test results indicate that the proposed ASMC has an admirable dynamic performance, exact control accuracy and reliable robust stability.