High-speed elevator car horizontal vibration fluid–solid interaction modeling method

Abstract

High-speed elevator horizontal vibration seriously affects passenger comfort. To reach the smooth operation of the high-speed elevators, it is extremely important to study the horizontal vibration of the elevator car. There are two main factors that cause the horizontal vibration of the high-speed elevator car, namely, the guidance system excitations and the car aerodynamic characteristics running in the hoistway. Under the coupling action of these two factors, the horizontal vibration of the high-speed elevator car system is aggravated. To accurately obtain the horizontal vibration information of the high-speed elevator, we developed the high-speed elevator car horizontal vibration fluid–solid interaction model. It is decoupled by the proposed fluid–solid interaction decoupling solution. The influence of the high-speed elevator running speed, the guide rail profile deviation, and the rolling guide shoe dynamic parameters on the car horizontal vibration is analyzed. To verify the feasibility of the proposed method, the 5 m/s, 7 m/s, 8 m/s, and 10 m/s high-speed elevators are applied in a 288 m test tower. The simulation accuracy using the proposed method reaches the minimum of 0.93% in 5 m/s case of the peak-to-peak value, reaches the minimum of 3.11% in 10 m/s case of the A95 value, and reaches the minimum of 0.13% in 10 m/s case of the main frequency value. In general, the compared results of the peak-to peak vibration acceleration, the A95 value, and the main frequency are all closed in both 5 m/s, 7 m/s, 8 m/s, and 10 m/s cases.

Research on aerodynamic characteristics and energy consumption of elevator deflectors under different speed conditions

“…In the formula, 𝜌 is the air density; u is the velocity vector, 𝑥 (𝑗 = 1,2,3) is the flow rate in three directions, 𝜇 is the hydrodynamic viscosity; turbulent viscosity coefficient 𝜇 = . In the formula: 𝐶 is the turbulence constant, normally taken as 0.09; 𝐺 is the generation term for the turbulent kinetic energy k generated by the average velocity gradient;𝐺 is the term for the generation of turbulent kinetic energy k produced by the effect of buoyancy;𝑌 represents the effect of pulsation expansion on the total dissipation rate in compressible turbulent flows;𝐺 = 1.44、𝐺 = 1.92、𝐺 = 0 are empirical constants；𝛼 = 1.0 and 𝛼 = 1.3 are the Prandt1 numbers corresponding to the turbulent kinetic energy k and dissipation rate 𝜀 , respectively;𝑆 = 0 and 𝑆 = 0 are user-defined source terms [11].…”

Experimental study on damping characteristics of elevator traction system

“…When the damping is small, the test method has the advantages of high accuracy and less equipment. In order to improve the operation performance of elevator, reference [3][4][5][6] studies the relationship between elevator operation parameters (such as guide rail contact friction, guide rail structure parameters, building shaking, and other factors) and elevator dynamic characteristics. However, few scholars have studied the influence of the inherent properties of the traction system (car load, stiffness, and damping) on the vibration of elevator system.…”

“…3 For high-speed elevators, the car aerodynamic characteristics have an obvious effect on the running stability of the elevator. Qiu et al 4 studied the influence of aerodynamic parameters on the horizontal vibration of high-speed elevator which can improve the ride comfort of elevator. Zhang et al studied the influence of the three parameters such as the length, weight per unit length, and the bending stiffness on the dynamic characteristics of the guide rail.…”

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

“…The alternative movements of the elevator up and down the shaft during operation generate vibrations, causing discomfort to passengers [1][2][3][4][5]. In some cases, however, lateral vibration levels in the elevator cabin are so high that they can result in low comfort and reduced ride quality for the passengers, which are the main problems in high-speed elevator systems [6][7][8][9][10].…”