Intelligent control of active shock absorber for high-speed elevator car

Abstract

Due to the influencing factors, such as irregularity of guide, piston wind excitation in the hoistway, and uncertain swinging of hoisting rope during the operation of high-speed traction elevator, car will produce dramatic horizontal vibration. With the purpose of suppressing this vibration effectively, the active car shock absorber is designed with linear motor, and a five-degrees-of-freedom space vibration model of the car is established and, subsequently, its state space equation is derived. For the uncertainty external excitation in the car system, the back propagation neural network proportional–integral–derivative controller with linear prediction model is designed for the intelligent active control of the vibration of the car, and simulation analysis is carried out with MATLAB/Simulink. The result shows that the active shock absorber designed in this study can effectively suppress the horizontal vibration of high-speed elevator car, better than traditional proportional–integral–derivative controller. This study has opened up a new idea of high-speed elevator vibration damping method, and is of important referential significance for the field of active control of car vibration.

A Vibration-Related Design Parameter Optimization Method for High-Speed Elevator Horizontal Vibration Reduction

“…For the KLK2 high-speed elevator, the design parameters were substituted to obtain the optimization model of horizontal vibration reduction, as shown in equation (23). e expression of the objective function f(x) is unknown, and the expressions of g(x) and h(x) are known.…”

“…Step 3: according to equations (23) and (26), an approximate response surface model of the optimization objective function of horizontal vibration reduction d 1 � f(x) is built.…”

“…Knezevic et al [22] proposed the synergistic solution based on the jerk control and upgrade of the speed controller with a band-stop filter to restore lost ride comfort and speed control caused by vibration. Zhang et al [23] designed the active car shock absorber with a linear motor to effectively suppress high-speed traction elevator vibration. Nakano et al [24] presented a new control device to suppress horizontal vibration in the elevator cabin.…”

Study on Theoretical Model and Test Method of Vertical Vibration of Elevator Traction System

“…Similarly, the second and third modal vectors of the undamped system are u (2) and u (3) , respectively. e modal matrix of the system is obtained as…”

“…With the development of modernization, people's life rhythm is faster and faster, the use range of elevator is gradually expanded, and the use frequency is also higher and higher [2]. Subsequently, the requirements of elevator safety, comfort, and running speed are constantly improved [3,4]. How to balance the elevator performance among these three requirements is a problem that elevator workers all over the world have been thinking about.…”