Tuned Gyroscope With Dynamic Absorber

Michael Strugach

Abstract: Dry tuned gyroscopes are subject to random drift, noise, characteristically large transmissibility at structural resonance, bias shifts vs temperture, etc. The dynamic model of a tuned gyro is represented by a coupled multiple degree of freedom system, where bearing induced vibrational outputs pass through structural resonances. This article describes the application of the rotating dynamic vibration absorber, as a method of controlling the level of gyro structural radial and axial vibrations. By providing damping to the dynamic absorber, a system becomes Jess sensitive to tuning the resonant frequencies of the absorber system to the corresponding radial and axial gyro resonance frequencies. It significantly reduces rotor transmissibilities, keeps bias from shifting when bearing noise passes through resonances vs temperature, improves g and g2 sensitivity, as well as the gyro's ability to withstand random vibration. Equations of motion of the gyro with the dynamic absorber, and the absorber separately from the gyro are derived. Theoretical and experimental data of the whole system and the absorber itself are discussed. Presented test data include relative transmissibility curves of two absorber designs with different elastomers under variety of temperature and vibrational conditions, gyro transmissibilities at resonance without and with the dynamic absorber, comparative destructive random vibration testing and results of improvements in gyro random drift and noise.
Published in: Proceedings of the 1985 National Technical Meeting of The Institute of Navigation
January 15 - 17, 1985
San Diego, CA
Pages: 53 - 59
Cite this article: Strugach, Michael, "Tuned Gyroscope With Dynamic Absorber," Proceedings of the 1985 National Technical Meeting of The Institute of Navigation, San Diego, CA, January 1985, pp. 53-59.
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