Tuned gyroscope with dynamic absorber

Dry tuned gyroscopes are subjected to random drift, noise, characteristically large transmissibility at structural resonance, bias shifts vs temperature, 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. The 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 less 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 g-squared 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.