TECHNIQUES FOR VIBRATION RESISTANCE INCREASE OF QUARTZ PENDULUM ACCELEROMETER USING DIGITAL FEEDBACK AMPLIFIER

Subject of Research. The paper considers approaches of vibration resistance increasing for quartz pendulum accelerometer with digital feedback amplifier and without further development of measuring element design or application of damping measures. Method. The proposed methods are implemented algorithmically by means of the control program of the digital amplifier controller and are based on the extension of the device bandwidth, the correction of the regulating coefficients during the accelerometer operation, and the introduction of an additional control channel to the feedback loop. Main Results. The proposed methods were studied experimentally on a prototype quartz pendulum accelerometer with a digital feedback amplifier and a measuring range of ±50 g. The studies were carried out under the effects of vibration actions: broadband random vibration in the frequency range from 20 to 2000 Hz, (RMS deviation of the vibration acceleration amplitude of 8 g) and sinusoidal vibration in the frequency range from 20 to 2000 Hz (vibration acceleration amplitude of 10 g) along the sensitivity axis. The efficiency of the methods was estimated by the value of device vibration error — the difference between the averaged value of the device readings before vibration and the averaged value of the readings during the period of vibration. It was experimentally established that the best solution is to combine a wide bandwidth of the device with an additional control channel in the feedback loop, that reduces the accelerometer vibration error by an order of magnitude. Practical Relevance. The proposed methods increase the vibration resistance of a quartz pendulum accelerometer by applying original algorithms in the digital amplifier controller program, that makes it possible to put to use such accelerometers in objects susceptible to vibration while eliminating the need to introduce physical design modifications or additional damping measures.