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Sensors 2016, 16(5), 613;

Optimal Design of a Center Support Quadruple Mass Gyroscope (CSQMG)

Engineering Research Center for Navigation Technology, Department of Precision Instruments, Tsinghua University, Beijing 100084, China
This paper is an extended version of our paper entitled “Innovation of Flat Gyro: Center Support Quadruple Mass Gyroscope”. In Proceedings of the 2016 IEEE International Symposium on Inertial Sensors and Systems, Laguna Beach, CA, USA, 22–25 February 2016.
Authors to whom correspondence should be addressed.
Academic Editor: Jörg Wagner
Received: 24 March 2016 / Revised: 18 April 2016 / Accepted: 20 April 2016 / Published: 28 April 2016
(This article belongs to the Special Issue Inertial Sensors and Systems 2016)
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This paper reports a more complete description of the design process of the Center Support Quadruple Mass Gyroscope (CSQMG), a gyro expected to provide breakthrough performance for flat structures. The operation of the CSQMG is based on four lumped masses in a circumferential symmetric distribution, oscillating in anti-phase motion, and providing differential signal extraction. With its 4-fold symmetrical axes pattern, the CSQMG achieves a similar operation mode to Hemispherical Resonant Gyroscopes (HRGs). Compared to the conventional flat design, four Y-shaped coupling beams are used in this new pattern in order to adjust mode distribution and enhance the synchronization mechanism of operation modes. For the purpose of obtaining the optimal design of the CSQMG, a kind of applicative optimization flow is developed with a comprehensive derivation of the operation mode coordination, the pseudo mode inhibition, and the lumped mass twisting motion elimination. The experimental characterization of the CSQMG was performed at room temperature, and the center operation frequency is 6.8 kHz after tuning. Experiments show an Allan variance stability 0.12°/h (@100 s) and a white noise level about 0.72°/h/√Hz, which means that the CSQMG possesses great potential to achieve navigation grade performance. View Full-Text
Keywords: rate MEMS gyroscope; symmetric structure; quadruple mass; center support; coupling beam; optimal design rate MEMS gyroscope; symmetric structure; quadruple mass; center support; coupling beam; optimal design

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Zhang, T.; Zhou, B.; Yin, P.; Chen, Z.; Zhang, R. Optimal Design of a Center Support Quadruple Mass Gyroscope (CSQMG). Sensors 2016, 16, 613.

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