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Structural-acoustic coupling effects on the non-vacuum packaging vibratory cylinder gyroscope
Xiang Xi, Xuezhong Wu, Yulie Wu
1College of Mechatronics Engineering and Automation, National University of Defense Technology, Changsha 410073, China. dingbangxiao@nudt.edu.cn.
Sensors (Basel, Switzerland)
|December 20, 2013
Summary
Non-vacuum packaging in vibratory cylinder gyroscopes creates acoustic noise, impacting resonant shell dynamics. Structural-acoustic coupling significantly alters vibration amplitude and operating frequency, affecting gyroscope sensitivity.
Area of Science:
- Mechanical Engineering
- Acoustics
- Vibrational Analysis
Background:
- Vibratory cylinder gyroscopes often use metallic caps for packaging.
- Non-vacuum packaging, implemented to reduce production costs, can introduce internal acoustic noise.
- This acoustic noise exerts pressure on the gyroscope's resonant shell.
Purpose of the Study:
- To investigate the dynamical behavior of resonant shells under acoustic pressure.
- To analyze the effects of structural-acoustic coupling in non-vacuum packaged gyroscopes.
- To quantify the impact of acoustic pressure on gyroscope performance.
Main Methods:
- Utilized the theory of structural-acoustic coupling.
- Developed and employed a finite element (FE) model for quantitative analysis.
- Conducted experimental studies to validate FE model predictions and assess gyroscope sensitivity.
Main Results:
- Structural-acoustic coupling was found to alter vibration amplitude and operating frequency of the resonant shell.
- Changes in sealing cap size and vacuum degree were shown to directly affect resonant shell vibration.
- Experimental results demonstrated a 32.4 mV/°/s scale factor increase and a 6.2 Hz operating frequency variation with altered radial gap size.
Conclusions:
- Structural-acoustic coupling is a critical factor influencing vibratory cylinder gyroscope performance.
- Non-vacuum packaging necessitates careful consideration of acoustic pressure effects.
- Optimizing packaging parameters is essential for maintaining gyroscope accuracy and stability.
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