Abstract
This paper considers an ultrasonic method for controlling the amount of undissolved gas in hydraulic systems for any size of gas bubbles and a varying size-consist. Also, the main reasons for the appearance of undissolved gas in the hydraulic fluid take into account. The paper is of great importance because known methods for measuring the amount of undissolved gas require complex testing benches consisting of a large number of elements. The proposed apparatus will simplify the control of the amount of undissolved gas in the hydraulic fluid used in the hydraulic drive while maintaining the accuracy of the measurement.
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