| Citation: | CHEN Ding, CHEN Tianxing, YE Shaogan, et al. Contact dynamic modelling and vibration response analysis of the spline pair between cylinder and shaft of a piston pump[J]. Journal of Aerospace Power, 2025, 40（10）：20230773 doi: 10.13224/j.cnki.jasp.20230773
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The contact of the spline pair between the cylinder and shaft of piston pumps affects their operation reliability. It is important to analyze the contact mechanism of the spline pair and the vibration responses of the cylinder and shaft. In this study, a finite element contact dynamic model of the cylinder and shaft was developed, and the vibration responses of the cylinder and shaft were analyzed. The finite element contact dynamic model was described. The forces acting on the cylinder were analyzed, and the excitation forces were obtained. The contact mechanism and the vibration responses at various outlet pressure conditions were simulated and analyzed. The results showed that: the contact dynamic model can simulate the contact mechanism of the spline pair and the vibration responses of the cylinder and shaft. Under the influence of time-varying piston chamber pressure, the tooth contact position of the spline changed with the varying rotational angle. The increase of the outlet pressure led to the increase in the tooth contact stress, vibration responses and shaft deflection. The deflection at the spline of the shaft was much larger than that at other positions, and the deflection decreased from the spline side to the two end sides.
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