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Sensors 2017, 17(9), 2011;

Investigation on Eigenfrequency of a Cylindrical Shell Resonator under Resonator-Top Trimming Methods

State Key Laboratory of High Performance and Complex Manufacturing, College of Mechanical and Electrical Engineering, Central South University, Changsha 410083, China
Author to whom correspondence should be addressed.
Received: 31 July 2017 / Revised: 22 August 2017 / Accepted: 31 August 2017 / Published: 2 September 2017
(This article belongs to the Special Issue Inertial Sensors for Positioning and Navigation)
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The eigenfrequency of a resonator plays a significant role in the operation of a cylindrical shell vibrating gyroscope, and trimming is aimed at eliminating the frequency split that is the difference of eigenfrequency between two work modes. In this paper, the effects on eigenfrequency under resonator-top trimming methods that trim the top of the resonator wall are investigated by simulation and experiments. Simulation results show that the eigenfrequency of the trimmed mode increases in the holes-trimming method, whereas it decreases in the grooves-trimming method. At the same time, the untrimmed modes decrease in both holes-trimming and grooves-trimming methods. Moreover, grooves-trimming is more efficient than holes-trimming, which indicates that grooves-trimming can be a primary trimming method, and holes-trimming can be a precision trimming method. The rigidity condition after grooves-trimming is also studied to explain the variation of eigenfrequency. A femtosecond laser is employed in the resonator trimming experiment by the precise ablation of the material. Experimental results are in agreement with the simulation results. View Full-Text
Keywords: eigenfrequency; cylindrical resonator; trimming methods; femtosecond laser eigenfrequency; cylindrical resonator; trimming methods; femtosecond laser

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Zeng, K.; Hu, Y.; Deng, G.; Sun, X.; Su, W.; Lu, Y.; Duan, J. Investigation on Eigenfrequency of a Cylindrical Shell Resonator under Resonator-Top Trimming Methods. Sensors 2017, 17, 2011.

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