Torsional Vibration Analysis of a Rotor-shaft System Using its Scale Model and Scaling Laws

• Main Authors: Yung-His Liu, 劉永習
• Other Authors: Jia-Jang Wu
• Format: Others
• Language: zh-TW
• Published: 2009
• Online Access: http://ndltd.ncl.edu.tw/handle/33752847318711700667

碩士 === 國立高雄海洋科技大學 === 輪機工程研究所 === 98 === This paper presents the scaling laws that provide the criteria of geometry and dynamic similitude between the full-size rotor-shaft system and its scale model, and can be used to predict the dynamic behaviour of the full-size rotor-shaft system by manipulating the corresponding data of its scale model. The scaling factors, which play fundamental roles in predicting the geometry and dynamic relationships between the full-size rotor-shaft system and its scale model, for torsional free vibration problems between scale and full-size rotor-shaft systems are firstly obtained from the equations of motion of torsional free vibration. Then, the scaling factor of external force (i.e., torque) required for the torsional forced vibration problems is determined based on the Newton’s second law. Numerical results show that one may accurately predict the torsional free and forced vibration characteristics of a full-size rotor-shaft system from those of its scale models by using the foregoing scaling factors. For this reason, it is believed that the presented approach will be significant for investigating the relevant phenomenon in the scale model tests.