Stability of Ring-Type MEMS Gyroscopes Subjected to Stochastic Angular Speed Fluctuation

[+] Author and Article Information
Samuel F. Asokanthan

ASME Member Professor Department of Mechanical and Materials Engineering Western University, London, Ontario N6A 5B9 Canada

Soroush Arghavan

General Motors of Canada Ltd 101 McNabb Street, Markham, Ontario L3R 4H8 Canada

Mohamed Bognash

Department of Mechanical and Materials Engineering Western University, London, Ontario N6A 5B9 Canada

1Corresponding author.

ASME doi:10.1115/1.4036452 History: Received December 01, 2016; Revised March 24, 2017


Effect of stochastic fluctuations in angular velocity on the stability of two-degree-of-freedom ring-type MEMS gyroscopes is investigated. The governing Stochastic Differential Equations are discretized using the higher-order Milstein scheme in order to numerically predict the system response assuming the fluctuations to be white noise. Simulations via Euler scheme as well as a measure of Largest Lyapunov Exponents are employed for validation purposes due to lack of similar analytical or experimental data. The response of the gyroscope under different noise fluctuation magnitudes have been computed to ascertain the stability behavior of the system. External noise that affect the gyroscope dynamic behavior typically results from environment factors and the nature of the system operation can be exerted on the system at any frequency range depending on the source. Hence, a parametric study is performed to assess the noise intensity stability threshold for a number of damping ratio values. The stability investigation predicts the form of threshold fluctuation intensity dependence on damping ratio. Under typical gyroscope operating conditions, nominal input angular velocity magnitude and mass mismatch appear to have minimal influence on system stability.

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