Vibration analysis of vertical shaft tower structures of Muduchaideng Coal Mine

Abstract

There is a hoisting system in 68.37 m floor of vertical shaft tower of Muduchaideng Coal Mine. When vertical shaft hoisters were in full speed of 13 m/s ,the middle floor structure of the seventh floor's west side and the sixth floor's north side and south side would occur an enormous vibration. In view of above problems, a vibration dynamic test method was used to measure and analyze time domain signal and frequency domain signal of different location of the hoister and the vertical shaft tower, the results show that the natural vibration frequency of the sixth and the seventh floor are close to the natural vibration frequency of the motor of hoisters which is 22.1 Hz，it should adjust power system of the hoister equipments or the stiffness of the sixth and the seventh floor system to avoid resonance of coupling system of hoister-tower strectures; with increasing of hoisting speed, vibration intensity of the sixth and the seventh floor are gradueully becoming bigger, it should improve assembly accuracy between base and base beam of the hoister equipments to reduce vibration displacement of the floors.

Keywords

• vertical shaft tower
• hoisters
• hoister-tower structures
• vibration testing
• vibration frequency
• vibration displacement
• natural frequency