Research and Device Design of Coal Mine Mechanical Impact Behaviors Based on Energy Distribution Principle
To study the impact damage behaviors of coal mining machinery during service,the horizontal impact of a spherical projectile on a metallic rectangular plate was used as a case study to derive the energy distribution relationship during impact processes.In line with the actual impact con-ditions,a pneumatic horizontal impact testing system was designed and constructed to capture the im-pact response of plates under varying air pressures.Through simulations and experiments,the theo-retically calculated deformation and acceleration were validated,and a polynomial fitting approach was used to optimize the acceleration of output parameters.The computations,experiments,and simula-tions were compared.Results show that the kinetic energy of the projectile is primarily expended on plastic deformation of material,kinetic energy of motion,and collision loss during impact.When the central region of impacted plate fractures,the energy dissipates through plastic deformation and colli-sion loss decreases.The refined theoretical,experimental,and simulation results for energy distribu-tion relationship show good agreement during the impact processes,with a maximum deviation of less than 9.39％.
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