# Simulation and Experimental Analysis of Pressure Pulsation Characteristics of Pump Source Fluid
## 6 Simulation and Experimental Analysis  
### Analysis of the Test Results of the Fluid Pressure Pulsation Experiment  
The motor speed was set to \(n=1800\) r/min and the size of the throttle valve was adjusted to make the load pressure of the hydraulic system \(p_{1}=4.375\) MPa, \(p_{2}=8.38\) MPa, and \(p_{3}=12.87\) MPa, respectively. The SC-XS12-A data acquisition instrument was used to collect dynamic fluid pressure pulsation signals and obtain the time-frequency domain waveform diagrams of fluid pressure pulsations under different pressures, as shown in Figures 12-14. It can be seen that the fluid pressure pulsation curve measured at the outlet of the pump showed periodic changes during a constant motor speed. The fluid pressure pulsation curve contained multiple harmonic components in a wide frequency range, and as the load pressure of the hydraulic system increased, the amplitude of the fluid pressure pulsation at the outlet of the pump source increased, which had the most significant impact on the amplitude of the fundamental frequency. The conclusions drawn from the experiment were basically consistent with the simulation results. \begin{table}
\begin{tabular}{c c c c} \hline \hline
**System** & **Name** & **Model** & **Performance** \\ \hline \multirow{4}{*}{Hydraulic system} & Electric motor & YX3-180M & rated power 18.5 kW \\  & Plunger pump & MCY14-1B & maximum pressure 31.5 MPa, nominal displacement \\  & Frequency converter & SD100-4T-18.5 & 25 mL/r \\  & Throttle valve & DVP16-1-10B & maximum pressure 35 MPa, maximum flow 100 L/min \\  & Relief valve & ZDB10 VP-1-40B & maximum pressure 31.5 MPa, maximum 60 L/min \\ \hline \multirow{4}{*}{Test system} & Pressure Sensor & CY-YD-205 & reference sensitivity 12.09 Pc/105 Pa, pressure \\  & Impedance converter & YE5857A-1 & sensitivity coefficient 0.990, output range 5 Vpp \\  & Data collector & SC-XS12-A & 8 channels, the sampling frequency of a single channel \\  & Straight & \(12\times 2.0\) & the outer diameter is 12 mm, the inner diameter is \\  & & 10 mm, the length is 530 mm, and the weight is 163.7 g \\ \multirow{2}{*}{Piping system} & Clamp & S10.9.3816/S10.9.3817 & inner diameter 12 mm, crotch distance 21 mm, bolt hole \\  & Hose & 5-10 FDLX & greatest pressure 21 MPa \\  & Sensor tee & 10 MDL-10 FM-10 MDL & Thread M10 \(\times\) 1 \\ \hline \hline \end{tabular}
\end{table} 
Table 4: Main components of the pump source fluid pressure fluctuation test platform. Figure 11: Installation and layout of the fluid pressure sensor at the inlet of the measured pipeline. Figure 14: Load pressure (\(p_{3}\) = 12.87 MPa) waveform. (**a**) Time domain diagram; (**b**) frequency domain map. Figure 12: Load pressure (\(p_{1}\) = 4.375 MPa) waveform. (**a**) Time domain diagram; (**b**) frequency domain map. Figure 13: Load pressure (\(p_{2}\) = 8.38 MPa) waveform. (**a**) Time domain diagram; (**b**) frequency domain map. Figure 16b extracted the first three frequencies of fluid pressure pulsation, as shown in Table 8.  
Under the same load pressure level \(p_{3}\) = 12.87 MPa, the pump source fluid pressure pulsation was simulated and experimentally tested, and the fluid pressure pulsation waveform curves were compared and analyzed, as shown in Figure 17.  
Through Figure 17a, the simulated and measured pump fluid pressure pulsation value and pressure pulsation rate were obtained, as shown in Table 9. \begin{table}
\begin{tabular}{c c c c} \hline \hline  & **Greates Pressure** & **Minimum Pressure** & **Pressure Pulsation** \\  & **(MPa)** & **(MPa)** & **Rate (\%)** \\ \hline experiment & 8.556 & 8.241 & 3.8 \\ simulation & 8.578 & 8.182 & 4.7 \\ \hline \hline \end{tabular}
\end{table} 
Table 7: Comparative analysis of the fluid pressure fluctuation value and pressure fluctuation rate. Figure 16: Comparison of simulation and experiment results. (**a**) Time domain comparative analysis chart; (**b**) frequency domain comparative analysis chart.