Modal disturbance investigation of rod-shaped ultrasonic motor using bending vibrations |
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Authors: | Jiantao ZHANG Hua ZHU Chunsheng ZHAO |
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Affiliation: | (1) Precision Driving Laboratory, Nanjing University of Aeronautics & Astronautics, Nanjing, 210016, China |
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Abstract: | Modal disturbance of a rod-shaped ultrasonic motor using bending vibrations can cause problems such as low motor efficiency,
instability, and poor control. In this paper, a dynamic analysis model of a stator is created on the basis of the finite element
method (FEM) and Hamilton principle. The modal frequency sensitivities of the stator to the structure parameters are investigated
by modal analysis. Accordingly, the structure parameters of the stator are modified to separate working modes from disturbance
modes. A rod-shaped ultrasonic motor stator is fabricated, and the experimental results of its amplitude frequency response
characteristics show that the purpose of modal separation is achieved. The frequency separation between working modes and
disturbance modes is more than 2 kHz. The validity of the method is verified.
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Translated from Piezoelectrics & Acoustooptics, 2008, 30(6) 译自: 压电与声光] |
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Keywords: | ultrasonic motor finite element modal analysis sensitivity analysis |
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