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Structural-Acoustic Coupling Effects on the Non-Vacuum Packaging Vibratory Cylinder Gyroscope
College of Mechatronics Engineering and Automation, National University of Defense Technology, Changsha 410073, China
Beijing Special Vehicle Institute, Beijing 100073, China
State key Laboratory of High performance Complex Manufacturing, Central South University, Changsha 410083, China
* Author to whom correspondence should be addressed.
Received: 6 November 2013; in revised form: 21 November 2013 / Accepted: 22 November 2013 / Published: 13 December 2013
Abstract: The resonant shells of vibratory cylinder gyroscopes are commonly packaged in metallic caps. In order to lower the production cost, a portion of vibratory cylinder gyroscopes do not employ vacuum packaging. However, under non-vacuum packaging conditions there can be internal acoustic noise leading to considerable acoustic pressure which is exerted on the resonant shell. Based on the theory of the structural-acoustic coupling, the dynamical behavior of the resonant shell under acoustic pressure is presented in this paper. A finite element (FE) model is introduced to quantitatively analyze the effect of the structural-acoustic coupling. Several main factors, such as sealing cap sizes and degree of vacuum which directly affect the vibration of the resonant shell, are studied. The results indicate that the vibration amplitude and the operating frequency of the resonant shell will be changed when the effect of structural-acoustic coupling is taken into account. In addition, an experiment was set up to study the effect of structural-acoustic coupling on the sensitivity of the gyroscope. A 32.4 mV/°/s increase of the scale factor and a 6.2 Hz variation of the operating frequency were observed when the radial gap size between the resonant shell and the sealing cap was changed from 0.5 mm to 20 mm.
Keywords: vibratory cylinder gyroscope; structural-acoustic coupling; resonant shell
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MDPI and ACS Style
Xi, X.; Wu, X.; Wu, Y.; Zhang, Y.; Tao, Y.; Zheng, Y.; Xiao, D. Structural-Acoustic Coupling Effects on the Non-Vacuum Packaging Vibratory Cylinder Gyroscope. Sensors 2013, 13, 17176-17192.
Xi X, Wu X, Wu Y, Zhang Y, Tao Y, Zheng Y, Xiao D. Structural-Acoustic Coupling Effects on the Non-Vacuum Packaging Vibratory Cylinder Gyroscope. Sensors. 2013; 13(12):17176-17192.
Xi, Xiang; Wu, Xuezhong; Wu, Yulie; Zhang, Yongmeng; Tao, Yi; Zheng, Yu; Xiao, Dingbang. 2013. "Structural-Acoustic Coupling Effects on the Non-Vacuum Packaging Vibratory Cylinder Gyroscope." Sensors 13, no. 12: 17176-17192.