Hydraulic–mechanical coupling modeling by bond graph for impact system of a high frequency rock drill drifter with sleeve distributor

• Impact system of high frequency rock drill drifter with sleeve distributor is proposed.
• Performance test was performed on the arm of excavator.
• Nonlinear hydraulic–mechanical coupling model for impact system is built using bond graph.

The impact system of a high frequency rock drill drifter was modeled. The structure and working principle of the impact system are presented. A performance test system was built using the arm and the hydraulic source of excavator. A mathematical model was developed to analyze the nonlinear hydraulic–mechanical coupling performance for the impact system using bond graph. The simulation was done using the mathematical model and relative parameters in the test. The simulation results satisfied the test, which verified the accuracy of the model. The influences of inlet oil flow, pre-charge pressure for accumulator with high pressure and system setting pressure to impact system performance were determined, which provide the theoretical basis to set operation parameters.