Variable Universe Fuzzy Sliding Mode Variable Structure Control Based on Maglev Ball System

摘要

The magnetic levitation ball is a typical nonlinear and unstable system. To weaken the chattering phenomenon of traditional sliding mode control (SMC) and improve the control accuracy of the system, a variable universe fuzzy sliding mode variable structure control was proposed. The algorithm uses an equivalent SMC to accurately track the position of the maglev ball, and switching control forces the system state to slide on the sliding mode surface, the variable universe fuzzy control is used to soften the switching control output signal where the variable universe is equivalent to adding control rules, therefore, chattering is weakened. The simulation test of the system showed that the designed variable universe fuzzy sliding mode controller (VUFSMC) could effectively improve the accuracy of the control system and weaken chattering, and could accurately track the position of the maglev ball which had practical application value.