Effect of Structural Anisotropy on Anchor Loss Mismatch and Predicted Case Drift in Future Micro-Hemispherical Resonator Gyros

L. Sorenson and F. Ayazi

Abstract: The effect of structural anisotropy leading to anchor loss mismatch in micro-Hemispherical Resonator Gyros (micro-HRGs) is investigated by developing an anchor loss model based on finite element analysis. Worst-case lower bound estimates for the anchor loss component of the quality factor (Q) are found based on the computed frequency difference between a clamped support and a free support interface. The Young’s modulus of the finite element model is varied in a 4th-harmonic pattern in the circumferential direction of the micro-HRG, resulting in splitting of the Q and resonance frequency of the otherwise degenerate gyro wineglass mode pair, allowing prediction of the case drift performance.
Published in: Proceedings of IEEE/ION PLANS 2014
May 5 - 8, 2014
Hyatt Regency Hotel
Monterey, CA
Pages: 493 - 498
Cite this article: Sorenson, L., Ayazi, F., "Effect of Structural Anisotropy on Anchor Loss Mismatch and Predicted Case Drift in Future Micro-Hemispherical Resonator Gyros," Proceedings of IEEE/ION PLANS 2014, Monterey, CA, May 2014, pp. 493-498.
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