Composite disturbance-observer-based control and terminal sliding mode control for uncertain structural systems

A new type of composite control scheme of disturbance-observer-based control and terminal sliding mode control is proposed for uncertain structural systems. The disturbance are supposed to include two parts. One is generated by an exogenous system, which can represent the harmonic signals with modeling perturbations in structural system. The other part is external excitation in H2-norm context. By combining the disturbance observer with terminal sliding mode control law, the disturbance with the exogenous system can be estimated and compensated, and external excitation can be attenuated in finite time which can be computed by our approach. Especially,the design of disturbance observer and controller can be obtained separately. Finally, simulations for a four-degree-of-freedom building model excited by 1940 El Centro earthquake excitation are given to demonstrate the effectiveness of the approach and compare the proposed results with the previous schemes in accuracy.