標題: | Bi-dimensional finite element analysis for modal separation of a circular cylindrical WW-USM |
作者: | Yu, Tai-Ho Yang, Shin-Yueh Lee, Chen-Liang Yin, Ching-Chung 機械工程學系 Department of Mechanical Engineering |
關鍵字: | Wedge wave ultrasonic motor (WW-USM);Bi-dimensional finite element analysis (Bi-d FEA) method;Modal separation;Modal sensors |
公開日期: | 1-七月-2011 |
摘要: | This paper describes a modal separation model that improves the performance of wedge wave ultrasonic motors (WW-USMs) using the bi-dimensional finite element analysis (Bi-d FEA) method. Most USMs operate near the resonant frequency of a specific vibration mode, which must be well separated from the resonant frequencies of other modes. In the current prototype, unexpected disturbance induced at the instant of switching on/off or changing direction of the motor appeared in simulations and actual measurements. These fluctuations are due to vibration modes other than the driving mode occurring around the operating frequency. Bi-d FEA numerical simulation results indicate that selecting an appropriate height for the upper base under the piezoelectric tube achieves excellent modal separation. Measurements of the traveling wave taken by modal sensors show that the proposed motor performs better than traditional motors, offering a faster transient response in revolution speed and a more stable design. Suppressing the unexpected modes in excitation of the WW-USM increased the maximum output torque by 50% and the efficiency of mechanical/electrical transformation by 50%. (C) 2011 Elsevier B.V. All rights reserved. |
URI: | http://dx.doi.org/10.1016/j.finel.2011.01.006 http://hdl.handle.net/11536/22364 |
ISSN: | 0168-874X |
DOI: | 10.1016/j.finel.2011.01.006 |
期刊: | FINITE ELEMENTS IN ANALYSIS AND DESIGN |
Volume: | 47 |
Issue: | 7 |
起始頁: | 635 |
結束頁: | 642 |
顯示於類別: | 期刊論文 |