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Sensors 2008, 8(6), 3706-3718; doi:10.3390/s8063706

Dynamic Characteristics of Vertically Coupled Structures and the Design of a Decoupled Micro Gyroscope

* , ,  and
Department of Mechanical Engineering Sogang University / #1 Shinsu-dong, Mapo-gu, Seoul 121-742, Korea
* Author to whom correspondence should be addressed.
Received: 21 March 2008 / Revised: 24 May 2008 / Accepted: 2 June 2008 / Published: 3 June 2008
(This article belongs to the Special Issue Modeling, Testing and Reliability Issues in MEMS Engineering)
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In a vertical type, vibratory gyroscope, the coupled motion between reference (driving) and sensing vibrations causes the zero-point output, which is the unwanted sensing vibration without angular velocity. This structural coupling leads to an inherent discrepancy between the natural frequencies of the reference and the sensing oscillations, causing curve veering in frequency loci. The coupled motion deteriorates sensing performance and dynamic stability. In this paper, the dynamic characteristics associated with the coupling phenomenon are theoretically analyzed. The effects of reference frequency and coupling factor on the rotational direction and amplitude of elliptic oscillation are determined. Based on the analytical studies on the coupling effects, we propose and fabricate a vertically decoupled vibratory gyroscope with the frequency matching.
Keywords: vibratory gyroscope; coupled motion; vibration analysis. vibratory gyroscope; coupled motion; vibration analysis.
This is an open access article distributed under the Creative Commons Attribution License (CC BY) which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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Choi, B.; Lee, S.-Y.; Kim, T.; Baek, S.S. Dynamic Characteristics of Vertically Coupled Structures and the Design of a Decoupled Micro Gyroscope. Sensors 2008, 8, 3706-3718.

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