Control Strategy Design of Magnetic-Air Active-Passive Hybrid Floating Raft Vibration Isolation System: Optimized Type-2 Fuzzy Control System

Magnetic-air active-passive hybrid floating raft vibration isolation system is one of the most effective systems of vibration isolation in submarine stealth. The system is featured by complex system, strong coupling and nonlinearity, which makes it difficult to establish a system model and is hard to control. Therefore, it is very necessary to design a feasible control strategy. Type-2 fuzzy control is not only independent of the accurate model of the controlled system, but also able to control the highly coupled and complex nonlinear systems, which has outstanding performance in dealing with fuzzy language uncertainty, expert knowledge extraction uncertainty and external interference of system. However, Type-2 fuzzy control has the disadvantages of complex structure and heavy computation etc., which makes it not widely used in practice. In this paper, an approximate Gauss fitting method is proposed to simplify the expression of membership function, and the N-T type-reduction algorithm and centroid defuzzification method are used to optimize Type-2 fuzzy control. The dual-input/single-output feedback fuzzy control system is established by optimized Type-2 fuzzy control, and a large amount of learning and simulation analysis is carried out on the control system. The purpose is to provide a theoretical and technological foundation for the application of Type-2 fuzzy control in magnetic-air active-passive hybrid floating raft vibration isolation system.