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. Then, the vibration characteristics of the three DOF system are analyzed, and the natural frequencies and modes are obtained. The 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. The 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. Therefore, 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.
Highlights
As a mean of vertical transportation in buildings, elevators bring great convenience to people’s life [1]
After a reasonable simplification of the model, a 3-DOF system is used to analyze the vibration response characteristics of the elevator traction system under emergency braking. is paper puts forward a test method for the characteristics of elevator emergency braking vibration and tests and analyzes the operation of an elevator with a lifting height of 7.51 meters in the laboratory under four different working conditions
The following conclusions are obtained: (1) From the comparison of the normal uplink and downlink test results, it can be seen that the speed and distance errors measured by the test method proposed in this paper are not more than 4.2%, no matter in the uplink or downlink stage, which shows that the test method adopted in this paper is correct and the instrument used has high precision
Summary
As a mean of vertical transportation in buildings, elevators bring great convenience to people’s life [1]. In this paper, based on the actual operation characteristics of the elevator, the vibration of the elevator traction system is studied by using the centralized parameter discrete model, and the influence of the rotation characteristics of the traction wheel is considered. In order to analyze the influence of braking moment on the lift car and counterweight, a 1 : 1 elevator model is studied in this paper, the centralized mass discretization model is used to analyze the vibration response of the elevator traction system under the action of external torque, and the influence of the relative slip between the wire rope and the traction wheel is considered.
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