Research On Experimental Method Of Simulation Test Of Recoil Force

Aerogun recoil force is one of the important parameters used to evaluate the strength of recoil movement. It has very important significance to guide weapon’s structural parts strength analysis and performance optimization and to assess the flight safety of carrier aircrafts. Currently, the ground test bench is commonly applied to aerogun recoil force test. However, it is difficult to achieve a reasonable and effective assessment for aerogun recoil, because the research on dynamic characteristics of force-measuring platform is deep enough. In order to obtain static or dynamic characteristics of aerogun recoil test system, the paper carried out experimental method research on simulation test of aerogun recoil force.According to the specificity of aerogun recoil test, the excitation signal type and excitation location in system calibration were discussed and determined. By means of theoretical analysis and experiment research, two types of negative step force calibration method which applied to weapon system were comparatively studied on their applicability and feasibility.The paper focuses on analyzing the key technologies of brittle material fracture method which include accurate measurement of negative step force and carrying capacity control method of brittle sample, which decrease the influence of additional parts and reduce the dispersibility of fracture force value. The in-situ calibration device applying the above research results was designed. The functions of this device include loading, eliminating gaps, straight line feed, negative step forec generation and measuremnent, weapon interface etc. And its uncertainty of measurement was analyzed.To carry out study on dynamic characteristics of recoil measuring platform by experimental means. The system model was built by parameter identification method and the properties of recoil measuring platform sufficiently fulfill aerogun recoil test requirement. The static sensitivity was gained by in-situ static calibration. Besides, by means of dynamic calibration and system identification, two types of "aerogun-carrier" system models were gotten. Based on this, the alternative model was built and its conversion accuracy is superior to 2.34%. Thus, this method provided a technological means to analyze the recoil measuring platforms and build transformation relation between each test system.