Modified Sliding Mode Control Research Articles

Experiments on a Full-Scale Building Model using Modified Sliding Mode Control

This paper presents a modified sliding mode control (MSMC) method using acceleration feedback to reduce the response of seismic-excited civil buildings. A pre-filter is introduced prior to the control command so that a systematic trade-off between control and structural responses can be achieved. To demonstrate practical implementation of MSMC controllers, extensive shake table experimental tests have been conducted on a full-scale three-story building equipped with active bracing systems at the National Center for Research on Earthquake Engineering, Taiwan. To improve the effectiveness of active control, a nominal system that incorporates the control–structure interaction effect is used in the MSMC controller design. In addition, existing system uncertainties in the nominal system resulting from system identification are considered in the process of controller design and the robustness of control performance and stability is demonstrated through shake table experiments. Experimental results indicate that the MSMC strategy using acceleration feedback for the full-scale building is robust and its performance is quite remarkable. Furthermore, the numerical simulation based on an analytical model that was identified previously by taking into account the control–structure interaction effect was conducted and comparisons are made with the experimental results. It is shown that the correlation between numerical simulation results and experimental data is quite excellent.

Sliding Mode Control for Ride Control System of SES

The Surface Effect Ship (SES) has very good speed performance and ride quality in the calm sea. However, in case of rough seas, it may deteriorate its performance due to the air leak from the gap between the hull and water surface. The ship is equipped with louvers and fins to control the ship motion.In previous papers by present authors, linear and Pseudo-Bang-Bang controllers and Fuzzy controller ware introduced for Ride Control System (RCS) of SES. But switching algorithm included in the control law was not clearly defined, which left ambiguity in the design of the control system. In this paper, the Sliding Mode Control (SMC) for RCS of SES is examined since SMC would provide the switching algorithm theoretically.As a result that, the original SMC may not give good controller because the controller cannot keep the state in the switching hyperplane due to relatively big disturbance. The modification which eliminates the equivalent control term is named Modified Sliding Mode Control (MSMC). The controller provides the control to bring the state toward the switching hyperplane.Comparison based on the simulation shows that MSMC can achieve the good control performance for the SES among waves.