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

Abstract

In order to study the dynamic characteristics of the elevator, the response characteristics of the elevator under normal operation and emergency braking conditions are analyzed. In this paper, the centralized mass discretization model is used to study the vibration characteristics of the elevator traction system under the external excitation. Firstly, the vibration equation of the elevator multi-degrees-of-freedom (abbreviated as DOF) system is established. en, the vibration characteristics of the three DOF system are analyzed, and the natural frequencies and modes are obtained. e free vibration equation and forced vibration equation are obtained, and the theoretical solutions are obtained. Finally, the test method proposed in this paper is used to test the normal operation and emergency braking of the elevator. e test results show that, under normal operation conditions, the measured speed and distance errors are not more than 4.2%, the up running distance measured by the elevator is larger than the actual value, while the down running distance is smaller than the actual value; under emergency braking condition, because the steel wire rope can only bear the pulling force, the peak acceleration fluctuation in the up emergency braking process is large, while the down emergency braking acceleration fluctuation is small. erefore, the elevator vibration analysis model and the vibration test method proposed in this paper can be used for the analysis of elevator dynamic performance, which has great reference value for the safety performance research of the elevator traction system.

Energy-Based Vibration Modeling and Solution of High-Speed Elevators Considering the Multi-Direction Coupling Property

“…Vibrational acceleration curve obtained from PMT EVA-625 is shown in Figure 10, in which the four curves from top to bottom are (I) variation curve of the absolute velocity during the height lifting process, (II) variation curve of the vibrational acceleration along X axis, (III) variation curve of the vibrational acceleration along Y axis, (IV) variation curve of the vibrational acceleration along Z axis. Max(P k )/P k along X, Y, Z axis are 0.384 m/s 2 Vibrational acceleration curve obtained from PMT EVA-625 is shown in Figure 10, in which the four curves from top to bottom are (I) variation curve of the absolute velocity during the height lifting process, (II) variation curve of the vibrational acceleration along X axis, (III) variation curve of the vibrational acceleration along Y axis, (IV) variation curve of the vibrational acceleration along Z axis. A comparison between the obtained indicators through DVM method, prototype experiments, and the proposed EVM method is shown in Table 2.…”

“…Through analysis on the non-linear vibration property of a moving elevator string with a weighted end, a time-varying differential equation set was constructed in [1], and further approximately solved by Hamilton's principle. The natural frequency and modes of the elevator traction system were analyzed in [2] after applying external excitation. The free vibration equation is constructed based on the obtained response characteristics, and were applied in normal 2 of 21 operation and emergency braking tests.…”

“…There are six steel traction ropes in KLK2 high-speed elevation system. The linear density of the steel ropes is ρ = 0.575 kg/m 2 , and the elastic modulus is E = 8 × 10 10 N/m2 . The nominal diameter of the traction rope and tension rope is d = 13 mm.…”

Experimental study on damping characteristics of elevator traction system

“…This model can be used to analyze the braking performance of elevator and has important reference value for the research on the safety performance of elevator traction system. 8 Wolszczak et al studied the nonlinear mechanical problems of elevator braking system under the action of uncertainty. Based on the condition of mechanical balance, the deterministic model between braking force and uncertain parameters is derived.…”

Prediction Model and Experimental Study on Braking Distance under Emergency Braking with Heavy Load of Escalator

“…erefore, how to prevent accidents and reduce the loss and social impact brought by accidents has been the research direction of scholars in the industry [10,[12][13][14].…”