# Simulation and Experimental Analysis of Pressure Pulsation Characteristics of Pump Source Fluid
###### Abstract  
The output flow pulsation characteristics of the hydraulic pump due to the structural characteristics may cause pump source fluid pressure pulsation and even cause the equipment to vibrate, which will affect the life and working reliability of the equipment. Scholars have done a lot of theoretical and simulation analysis on the characteristics of fluid flow and pressure pulsation caused by the specific structure and structure of the plunger pump, but there are few comparisons and analyses of the simplified model of the plunger pump and the pressure pulsation characteristics with experiments. In this paper, AMESim software is utilized to establish a simplified model of one seven-plunger hydraulic pump, and simulate and analyze the pump source fluid pressure pulsation characteristics of different system load pressures at a constant speed. An experimental platform for testing pump fluid pressure pulsation was designed and built, and the actual measurement and simulation results of pump fluid pressure pulsation were compared and analyzed. The results show that the system simulation data is in good agreement with the measured data, which verifies the correctness of the simplified model of the plunger pump. At the same time, it is found that the fluid pressure pulsation of the pump source exhibits broadband and multi-harmonic characteristics. At a constant speed, as the load pressure of the hydraulic system increases, the pump source fluid pressure pulsation amplitude increases, the pressure pulsation rate decreases, and the impact on the fundamental frequency amplitude is the most significant. The research results can provide a theoretical basis for suppressing the pressure pulsation of the pump source fluid and reducing the vibration response of a hydraulic pipeline under the action of the pulsating harmonic excitation. piston pump source; pressure fluctuation characteristics; AMESim simulation; experiment 11 October 2021 1  
optimization (MDO) program, which is applied to the vibroacoustic finite element method (FEM) model of an aircraft fuselage model. Through ground experiment testing on aircraft components, it was found that the blade channel frequency is a key parameter for the acoustic and vibration generated by the rotating engine rotor. A large number of theoretical and simulation analyses have also been carried out for the modeling of the flow and pressure pulsation of the hydraulic pump. [PERSON] et al. [7] of Italy established a plunger pump calculation model that considers damping tank oil inertia and cavitation. The flow pulsation of a single plunger was calculated by calculation, and then the overall outlet flow pulsation of the plunger pump was calculated, and it was verified through experiments. [PERSON] et al. [8] considered the fluid pulsation caused by the pumping mechanism and fluid compressibility and established a mathematical model of the flow pulsation of the plunger pump. Through experimental verification, it was obtained that the flow pulsation of the plunger pump was mainly due to the fluid compressibility caused by the higher load pressure, and the influence of the pumping mechanism on the flow pulsation is almost negligible. [PERSON] et al. [9] established the theoretical mathematical model of the plunger pump, analyzed its mathematical model using MATLAB software, and obtained the change curve of plunger pressure and flow pulsation. The results showed that as the engine speed and throttle lever angle increase, the flow rate and pressure pulsation amplitude of the plunger pump increase. When the throttle lever angle continues to increase, the average fuel supply of the plunger pump decreases. [PERSON] et al. [10] mathematically modeled the instantaneous pressure change process of the plunger cavity and deduced the low-noise valve plate orifice and triangular groove calculation formula, but because the inertia factor was not considered in the modeling process, there is a certain error.