Research On The Structural Emission Noise Of Axial Piston Pump

In engineering, almost all devices are formed by the drive and transmission systems, so the devices must be accompanied by a variety of specific frequency and amplitude of vibration when it is at work. And the vibration which is more than the standard allowable not only affects the equipment performance, but also undermines the operator's physical and mental health. For a hydraulic system, hydraulic pump is one of the most important noise sources. For axial piston pump, because of its high-pressure and high-speed performance, is widely used in high-end equipments, and its emission noise is one of the key study points. For the requirements of higher power density of the piston pump, designing a lightweight structure to reduce the emission noise has been a challenging job. Under the strength and stiffness constrains of the piston pump, how to design and optimize the housing structure is an important research point.The main contents of this paper are as follows:In chapter 1, the axial piston pump was introduced, including the case of vibration and noise. And then the application of the digital simulation technology in vibration and noise reduction work of the axial piston pump was described. The noise and vibration reduction work of the axial piston pump at home and abroad were summarized. The content of this study was determined, and the significance of this research was pointed out.In chapter 2, a virtual prototype simulation model of the axial piston pump was built, including its dynamic model and hydraulic model. The internal vibration transfer path and the excitation force of the piston pump were studied. Based on the virtual prototype simulation model, the excitation force of the outer surface of the pump structure was calculated.In chapter 3, the finite element model of the outer surface structure of the axial piston pump was built. The modal analysis and vibration response analysis were done with the finite element model. The boundary element model of the outer surface structure of the axial piston pump was built, and the noise emission analysis was done with this model.In chapter 4, the simulation results got from the first few chapters were summarized, and the outer surface structure was optimized. Noise emission, vibration and strength of the outer surface structure before and after optimization were compared.In chapter 5, the theory of sound intensity was summarized. The noise distribution in the structural system with the motor, bell housing and piston pump was studied and the main noise source was fixed. In chapter 6, all the research contents were summarized, and some new views were put forward in the future.