Analysis and application of a new noise test system for the hydraulic motor

Abstract

The loading system of the existing hydraulic motor performance test platform is complicated, the interference is too much, and it is not suitable to measure the hydraulic motor noise level. In this paper, a new platform for measuring the sound pressure level of the hydraulic motor noise is designed. It satisfies the requirement of simplification and less interference in other parts of the noise test except for the test object and ensures the accuracy of test results. This paper firstly introduces the hydraulic system and its principle, calculates the relations of the flow, pressure and power theoretically and verifies them with AMEsim. Then the control part, mechanical structure and semi-anechoic room of the hydraulic system are introduced and the method in the noise experiment is also explained. Finally, the noise level of a bent-axis type hydraulic piston motor is measured in the semi-anechoic room. The background noise and hydraulic motor noise under different conditions are tested by the Danish BK acoustic test system to verify the functionality and stability of the test platform and the noise spectrum, the efficiency of hydraulic system and the effect of the power recovery are analyzed.

High precision localisation of the sources of noise of a bent-axis motor

“…The distance of each part is close, and the vibration frequencies of components are the same or have multiplicative relationships. 5,6,7 Noise source location based on the acoustic array is a common and effective method. 8 Zeng 9 proposed the microphone array based on the SRC-phat algorithm, and Wang 10 put forward the Michelson fiber interferometer array.…”

“…The distance of each part is close, and the vibration frequencies of components are the same or have multiplicative relationships. 5,6,7…”