Study Of Swinging Vibration Control

All kinds of vibrations occurring in the procedure of production can be divided into linear and pendular vibration according to their modes of motion. As these vibrations are often harmful to production, they need to be restrained into a certain range to ensure equipment running safely. In order to improve the operating comfort and safety of equipment such as aerial tramway and reduce swinging vibration response, a new dynamic vibration absorber with a pendular motion to control swing vibrations was proposed in this paper and its fundamental principle was the mechanics theory of swing. The major studies of this paper can be described as follows:(1)A pendular dynamic vibration absorber was designed to control swinging vibrations which often occurred in the swinging structures when they suffered external excitations. According to the fixed-points theory, the natural frequency and the damping of the absorber were optimized. The accuracy of the optimal parameters and the effects of the absorber were verified by numerical simulations. The results showed that the forced pendular vibration response of a rolling structure can be reduced effectively by using this dynamic vibration absorber.(2)By using energy method and parametric vibration theory, the mechanism describing that the swing will be more higher as its sway was analyzed. The relationship between the varity law of the body’s center of gravity and pendular law of swing was obtained. According to the principle of swing, it can be deduced that the pendular amplitude will be reduced if the varity law of the body’s center of gravity is contrary to the change law in the procedure of swing sway.(3)Above deduction was used to control pendular vibration of swing structure in this paper and the dynamics model was established. The approximate theoretical amplitude of the swing was calculated by using obtained in the harmonic balance method and verified by numerical simulations. The results showed that it was effective to use the swing principle to restrain the pendular vibration amplitude for swing structure and the effect will be improved with increase of the changes of pendulum length.