Abstract:  In order to carry out the high acceleration impact detection of the internal electronic equipment of the ship and to improve the detection capability of the impact testing machine, the traditional impact testing machine was structurally improved, and a new type of hedge type impact testing machine was designed, and the design parameters and its dynamic characteristics were studied. Firstly, the mechanical structure and control principle of the hedge impact testing machine were introduced, the kinematic model of the equipment was established, and the test action was divided into four processes, which were energy storage, release, collision and braking stages. The mathematical modeling analyses of each stage were carried out, and the maximum energy collision point was determined. Then, solid models were developed and computer simulations were performed using ANSYS software to assess structural stability and impact acceleration predictions. Finally, the dynamic characteristics of the device were examined through several tests, and the location of the collision point and the size of the impact acceleration generated by the device were repeatedly tested at different positions. The acceleration and displacement signals were collected, and the signals were processed by noise reduction filtering and differential calculation to verify the reliability of the device performance. The results of the study show that the structure of the testing machine is simple, easy to operate, and can be tested repeatedly. The dispersion of the distribution data of the collision point from the ideal position in each test is within 30 mm, the data is stable and reliable, which meets the design requirements, and the control method is reasonable. By adjusting the release position of the test bench and the impact table, the size of the acceleration generated by the impact can be changed, and the maximum impact acceleration of about 2 000 g can be generated when releasing at the limit position, which can satisfy the test requirements of various components for impact resistance testing.
Key words: impact testing machine; impact test; reliability; kinematic model; motion process analysis; ANSYS; structural stability; impact acceleration