Identification of limiting damping mechanisms in a high quality factor hybrid resonator of space application gyroscope

Sharma, N. Gireesh; Sundararajan, T.; Gautam, Sachin S.

doi:10.1016/j.asr.2021.11.031

Cited by 8 publications

(2 citation statements)

References 31 publications

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“…where AQ and φQ are the amplitude and phase of 𝑦𝑦Q, respectively. Equation (9) demonstrates that, in the absence of considering the uncertain phase error introduced by the hardware circuitry, the phase φQ solely depends on the frequency ωQ of the ancillary signal, as well as the frequency ωy and quality factor Qy of the sense mode. Since the sense mode operates with forced vibration in the rate mode, its frequency ωy cannot be directly measured.…”

Section: Sense Mode Quality Factor Online Test Methodsmentioning

confidence: 99%

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An automatic damping-matching method for eliminating 87.64% damping asymmetry of MEMS vibratory gyroscope in rate mode

Zhou,

Ren,

Zhou

et al. 2023

Preprint

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The damping asymmetry error is a prominent factor influencing the static performance of fully symmetrical Micro-Electro-Mechanical Systems (MEMS) vibratory gyroscopes. To eliminate this error and enhance the gyroscope's static performance, this paper introduces a method for real-time identification and automatic matching of the damping asymmetry error in rate mode. By leveraging the vibration characteristics of the fully symmetrical MEMS vibratory gyroscope in rate mode, dedicated online test methods are devised to determine the quality factors for both the drive and sense modes, enabling online identification of the damping asymmetry error. Furthermore, an automatic damping-matching system is devised utilizing the mechanical-thermal dissipation mechanism of a resistive damper. The effectiveness of this proposed method is validated through simulations and experiments conducted on a MEMS disk resonator gyroscope (DRG). The experimental results show an accuracy within 4% for quality factor identification, while automatic damping matching effectively reduces the damping asymmetry error by 87.64%. Employing this automatic damping-matching method successfully diminishes the zero-input bias caused by damping asymmetry error in the MEMS DRG from 0.1067°/s to 0.0249°/s and improves bias instability from 0.3985°/s to 0.1878°/s.

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Section: Sense Mode Quality Factor Online Test Methodsmentioning

confidence: 99%

“…The asymmetry in stiffness gives rise to the coupling between the drive mode and the sense mode of the gyroscope 9,10 . This coupling results in quadrature error and frequency split, which detrimentally affect the sensitivity and the signal-to-noise ratio 11,12 .…”

Section: Introductionmentioning

confidence: 99%