Failure modes for rotary ultrasonic motors under shock environment

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Journal of Vibration and Shock ›› 2018, Vol. 37 ›› Issue (9) : 32-36.

SUN Dong1, WANG Xin-jie1,WANG Jiong1,CHEN Chao2,TANG Yu-juan3

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Abstract

It is significant to study failure modes of ultrasonic motors applied in weapon systems under shock environment. The possible failure modes of key components in ultrasonic motors include fracture and delamination of piezoelectric ceramics, drift of working frequency due to plastic deformation of the stator, and reduction or disappearance of pre-pressure due to stator and rotor’ plastic deformation and bolt-loosening in pre-tightening force mechanisms. The stress states and stress wave transmission process of each component of the motors were analyzed with dynamic simulation. It was shown that the pre-tightening force mechanism is the part to be damaged most easily in the whole structure of a motor. An air gun was used to conduct the impact-overload tests for an ultrasonic motor. When the impact load reached 26546g, bolts loosened, the pre-tightening force mechanism became invalid, but other parts had no obvious damages or deformations. The results provided a theoretical basis and improvement measures for the application of ultrasonic motors in weapon systems under shock environment.

Key words

shock environment / ultrasonic motor / failure model

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SUN Dong1, WANG Xin-jie1,WANG Jiong1,CHEN Chao2,TANG Yu-juan3. Failure modes for rotary ultrasonic motors under shock environment[J]. Journal of Vibration and Shock, 2018, 37(9): 32-36

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