Modal Analysis of Mast Section of Hoist Based on the Vibration Theory

Abstract

Vibration is one of problems of mechanical structures, because structural resonance or fatigue will be caused by the vibration, thus it will be cause the damage of structure. In order to avoid the damage of structure, it is necessary to analyze the stiffness characteristics of the structure，which is the natural frequency and vibration mode figure, therefore unnecessary loss because of the resonance causes can be effectively avoided. By using modal analysis method which is in the structural dynamics, vibration pattern of structure system can be visually obtained from theoretical calculation and ANSYS simulation. The first 6 order natural frequencies of different working conditions have been calculated in this paper, dynamic displacement formula in external excitation have been shown when the cage move to a different location. Vibration mode figure of structure system can be drawn corresponding to the first 6 order natural frequencies, based on the finite element analysis software ANSYS, vibration image of structure system have been simulated corresponding to the first 6 order natural frequencies. The dynamic characteristics of structure system are affected when the cage to a different location. Through the cage to a different location, external excitation force have a great influence on the top of the free end, in the actual construction, the top free ends connected tie-in device stiffness should be strengthened, the system stability will be improved.