Research on vibration reduction of direct-drive piston pump based on porous variable diameter Helmholtz pulsation attenuator

摘要

Aiming at the vibration suppression and noise reduction of a direct-drive piston pump system, a novel porous variable diameter Helmholtz pulsation attenuator (abbr. PVDHPA) was developed. The vibration suppression mechanism of PVDHPA was analyzed, and the pressure and flow mathematical model was established. The fluid vibration energy absorption characteristics of PVDHPA with different structural parameters in the direct-drive pump system were analyzed by computational fluid dynamics simulation. The optimized damping hole and maximum diameter of the resonant cavity of the PVDHPA are 6.5 mm and 110 mm, respectively. Based on the custom-manufactured testing apparatus, the vibration absorption effect of the PVDHPA was verified. The test results show that the vibration response amplitude of the direct-drive pump is significantly reduced after the installation of PVDHPA, in which the vibration signals in the 200-400 Hz and 1000 Hz frequency bands are significantly suppressed, and the vibration impact in the vertical direction is most significantly weakened. Meanwhile, the foot vibration acceleration of the direct-drive pump system decreases by 7.4 dB(A). These researches provide an effective method for vibration and noise reduction of the direct-drive pump systems.