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Abstract: In this paper, dynamic analyses of the swash plate vibration and pressure pulsation of an aircraft piston pump based on fluid-structure interactions (FSIs) are presented. Models of the swash plate piston pumps with three FSIs (named full FSIs and non FSI) are given. The simulation results of the discharge pressures at different rotation speeds in the synthesized pump model and experiments show good agreement. The numerical simulation results of the forces on the swash plate and the flow rate of the outlet chamber are presented and compared. The results of the two models show that the discharge pressure pulsation mostly depends on the kinematic relations of the piston slipper-shoe units (FSI-1), and is almost isolated from the swash plate vibration. The full FSIs simulation shows that the swash plate vibration is strongly influenced by the pressure pulsation through the control actuator mechanism (FSI-2) and the control valve mechanism (FSI-3), but the non FSI model does not show the same result. The full FSIs model is much more accurate in predicting the vibration of the swash plate and the pulsation of the discharge pressure than the non FSI model.

This paper models the full order dynamics of the swashplate type pump, used in aerospace applications. The contribution of the paper appears to be in the fact that a reduced order model (non-FSI) is compared to a full order model (full-FSI) and it is shown that the full order model compares more favorably with the experimental results in which various vibration characteristics have been measured. The message that I take from this paper is that, when seeking to understand the vibration characteristics of the machine it is important to consider the higher-order dynamics.

基于流构全耦合模型的柱塞泵斜盘振动和压力脉动的研究

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