1. Tianjin Key Laboratory of Advanced Electromechanical System Design and Intelligent Control, Tianjin 300384, China;
2. National Experimental Teaching Demonstration Center of Mechanical and Electrical Engineering, Tianjin 300384, China;
3.Tianjin Key Laboratory of Nonlinear Dynamics and Control, Tianjin 300072, China
Abstract:The existence of stiffness nonlinearity leads to the typical nonlinear hardening characteristic of the amplitude-frequency curve, which affects the stability of double sense-mode micro gyroscope’s output signals and its sensitivity.To compare the influences of linear and nonlinear stiffnesses on gyroscope’s output signals, the steady-state response of the system with linear stiffness was solved firstly.Next, the multi-scale method was used to get the approximate periodic solution of the nonlinear dynamic equation, and the influence of Coriolis force on the outputs was considered.On this basis, the influence of driving cubic stiffness nonlinearity on the amplitude-frequency curve, resonance frequency and sensitivity under primary resonance was discussed.The results show that the driving mode resonance frequency is closely related to the stiffness nonlinearity and peak value of vibration, and the stronger stiffness nonlinearity is, the more sensitive variation of resonance frequency’s drift to the amplitude is.The weak driving stiffness nonlinearity could result in a significant decrease in two sense-mode’s amplitudes at driving mode frequency.Thus, the output signal of the gyroscope is greatly affected, which reduces the stability of the gyroscope’s detection signal and produces a great deviation from the sensitivity value based on linear design.
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