Research on predictive sliding mode control strategy for horizontal vibration of ultra-high-speed elevator car system based on adaptive fuzzy

Abstract

In order to effectively suppress horizontal vibration of the ultra-high-speed elevator car system. Firstly, considering the nonlinearity of guide shoe, parameter uncertainties, and uncertain external disturbances of the elevator car system, a more practical active control model for horizontal vibration of the 4-DOF ultra-high-speed elevator car system is constructed and the rationality of the established model is verified by real elevator experiment. Secondly, a predictive sliding mode controller based on adaptive fuzzy (PSMC-AF) is proposed to reduce the horizontal vibration of the car system, the predictive sliding mode control law is achieved by optimizing the predictive sliding mode performance index. Simultaneously, in order to decrease the influence of uncertainty of the car system, a fuzzy logic system (FLS) is designed to approximate the compound uncertain disturbance term (CUDT) on-line. Furthermore, the continuous smooth hyperbolic tangent function (HTF) is introduced into the sliding mode switching term to compensate the fuzzy approximation error. The adaptive laws are designed to estimate the error gain and slope parameter, so as to increase the robustness of the system. Finally, numerical simulations are conducted on some representative guide rail excitations and the results are compared to the existing solution and passive system. The analysis has confirmed the effectiveness and robustness of the proposed control method.

Suppression of horizontal vibrations in high-speed elevators using active shock absorber to assist traditional damping systems

“…For high-speed elevators, safety and ride comfort are important considerations for modern, high-quality elevators. However, increasing the lifting speed can bring about serious vibration problems, making passengers feel uncomfortable and physiologically fatigued, thus reducing the comfort of passengers and even affecting the service life of the lift as well as the safety of passengers travelling on the lift (Wang et al, 2021;Yang et al, 2014). Previous research results show that when the lift speed exceeds 3 m/s, the transverse vibration acceleration of the lift car will be significantly greater than that of the low-speed lift (Zhang et al, 2019b).…”

Model Predictive Sliding Mode Control of Direct Current Motors

“…By utilizing a sliding mode observer-based stator current and disturbance observer, the system's robustness is further improved, as evidenced by successful experimental results. Wang et al [16] delved into predictive SMC for horizontal motion systems. While the details are not directly related to cascade control, they provide insights into MPC strategies and applications.…”

Active Control System Applied to Vibration Level Control in High-Speed Elevators

“…In [24], an adaptive sliding-mode controller with diffuse switching gain (FGASMC) is proposed to reduce the severe horizontal vibration of the high-speed elevator car system that is caused by the excitation of the guide rail. In [25], an adaptive fuzzy-based sliding-mode predictive controller (PSMC-AF) is presented to reduce the horizontal vibration of the ultra-high-speed elevator car system. Numerical simulations are presented considering some representative excitations of the guide rail and demonstrated that the proposed active control is more effective than the passive system.…”