EFFECT OF NONLINEAR CONTROL ON RESONANCE IN A SELF-OSCILLATING ACCELEROMETER
Annotation
Approaches to the problem of increasing accelerometer bandwidth is considered as one of the main characteristics of the device defining the area of its application. A method for increasing the bandwidth together with an increase in the resonance frequency of the accelerometer sensing element using non-linear self-oscillating control law is proposed. The bandwidth assessment is based on computer simulation of the frequency response characteristics of eleven variants of linear acceleration sensor designs, with three of them operating in the forced oscillation mode and five in the self-oscillation mode. The applied model uses two- and three-point relay control laws with hysteresis. For the design variants under consideration, replacement of linear control loop by a non-linear one, enables the bandwidth expansion up to eight times by increasing the oscillation frequency without changing the mechanical properties of the sensor.
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