Noise identification of hydraulic source cart based on sound-vibration fusion diagnosis

In response to the challenges of identifying and reducing noise from multiple sources in construction machinery, this study focuses on a hydraulic source cart as the research subject and employs a sound-vibration fusion diagnostic method for noise identification. Firstly, by analyzing the noise distribution of hydraulic source car under different speed, the main source of noise is deduced. Then, by analyzing the vibration spectrum of each part and comparing with the noise test results, the frequency and location of the main noise are determined. The results show that this method can accurately identify the main noise source frequencies and locations under different gear positions. At 800 r/min, 1500 r/min, and 2600 r/min, the maximum sound pressure levels of the hydraulic source cart are 73.08 dB at the valve side, 75.89 dB at the reducer side, and 78.67 dB at the pump side, with the main source frequencies being 602 Hz, 450 Hz, and 390 Hz, respectively. The main source frequencies are 602 Hz, 450 Hz and 390 Hz, all of which are integer multiple frequencies of the gear pump meshing frequency at this gear position, so the gear pump is the main noise source, and the main noise reduction object of the cart is the gear pump and its valve body.