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


文件中的檔案:

  1. 000290015100002.pdf