ISSN 0021-3454 (print version)
ISSN 2500-0381 (online version)
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10
Issue
vol 60 / OCTOBER, 2017
Article

DOI 10.17586/0021-3454-2017-60-8-697-703

UDC 621.38, 531.768

EFFECT OF NONLINEAR CONTROL ON RESONANCE IN A SELF-OSCILLATING ACCELEROMETER

S. R. Karpikov
Avangard JSC, Power Electronics and Special Systems Plant; engineer-programmer of 1st category


A. I. Skalon
St. Petersburg State University of Aerospace Instrumentation, Department of Advanced Mathematics and Mechanics; Professor


Abstract. 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.
Keywords: accelerometer, bandwidth, resonance, frequency response, simulation, selfoscillations, nonlinear systems

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