On the Transient Contact Behaviors of Automatic Ball Balancers

• Main Authors: Li-Cheng Chang, 張立成
• Other Authors: 傅增棣
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/34743309526845993948

碩士 === 臺灣大學 === 機械工程學研究所 === 95 === Being capable of balancing vibration at speeds higher than the natural frequency, automatic ball balancers have been widely used in rotary machinery with uncertain imbalance. However, it suffers from inconsistent performance in real operations. The purpose of this research is to analyze transient contact behaviors of two-ball balancers. Using Hertz contact theory and finite element analysis, contact models are established for collisions between balls and those between balls and the race. Consistency of system performance is investigated by observing the variation of convergent time and the largest vibration amplitude by transient simulation under changing initial conditions of balls. Based on the results, the effects of system parameters on transient behaviors are realized. It is found that mass of the stator and race damping have significant influence on convergent time, whereas system damping and mass of the stator have strong effect on the largest amplitude of system vibration. Changing race damping are influential on the number of collision. The results are expected to facilitate the settings of system parameters design improvement.