The paper describes a multi-domain simulation approach to model the operation of a flow generation unit for high pressure hydraulic tools (p_(max) > 700 bar). The system consists of two pumps connected with a specifically designed valve block that automatically varies the delivered flow on the basis of the load. At low pressure, all the flow is provided by an external gear pump, while at high pressure, the flow is provided by a radial piston pump with rotating cam design. The radial piston pump is the main subject of authors' research. After showing the features of operation of the entire system, the paper details out the simulation tool developed for the radial piston pump. This model is based on an interaction between a fluid dynamic model that calculates instantaneous pressure and flow rates in displacement chambers and a geometric model that calculates kinematic parameters. As shown by the results provided in the paper, the model is suitable to describe the main features of the flow through the unit, including displacement chamber pressure and delivery flow ripples. The model presented in this study aims to initiate research on formulating design principles for high pressure radial piston pumps with reduced fluid borne noise and better efficiency.
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