title: Dynamic Characteristics of Vertically Coupled Structures and the Design of a Decoupled Micro Gyroscope.
abstract: 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.
authors.affiliation: Department of Mechanical Engineering Sogang University / #1 Shinsu-dong, Mapo-gu, Seoul 121-742, Korea. bkchoi@sogang.ac.kr.
authors.forename: Bumkyoo
authors.initials: B
authors.lastname: Choi
authors.affiliation: Department of Mechanical Engineering Sogang University / #1 Shinsu-dong, Mapo-gu, Seoul 121-742, Korea.
authors.forename: Seung-Yop
authors.initials: SY
authors.lastname: Lee
authors.affiliation: Department of Mechanical Engineering Sogang University / #1 Shinsu-dong, Mapo-gu, Seoul 121-742, Korea.
authors.forename: Taekhyun
authors.initials: T
authors.lastname: Kim
authors.affiliation: Department of Mechanical Engineering Sogang University / #1 Shinsu-dong, Mapo-gu, Seoul 121-742, Korea.
authors.forename: Seog Soon
authors.initials: SS
authors.lastname: Baek
keywords: coupled motion; vibration analysis.; vibratory gyroscope