Low-noise hydraulic power unit design based on vibration modal and transfer function analysis

The hydraulic power unit is the power source of a hydraulic system, and also the source causing hydraulic system vibration and noise. In order to further reduce the vibration and noise level of hydraulic systems, this paper presents a low-noise hydraulic station design method based on modal analysis and Vibration Transfer Function(VTF) analysis. The finite element model of the hydraulic station is established, the mode of the oil station solved and the modal superposition method used to optimize the structure of the station and the installation position of the hydraulic pump. The optimal structure of the station and the improved installation location of the pump are obtained. The VTF is used to optimize the structure of the oil tank, and the influence of the pump vibration on the station is further reduced. The test results for vibration and noise show that the design method is effective in significantly reducing the vibration and noise of the hydraulic station. The vibration acceleration of the hydraulic station is reduced by 5.7 dB, and the air noise is reduced by 2 dB. In short, this paper provides a better way for reducing the vibration and noise of hydraulic systems.