Research On Mach Angle Measurement Technology Based On Warhead Shock Wave

Mach horn is one of the parameters used to describe the conical wave array of supersonic flying warheads.Existing projectile shock Mach angle measurement methods face problems such as high measurement cost or low measurement accuracy.This paper mainly studies the warhead shock Wave Mach angle test technology based on acoustic precision targets,and the research work is as follows for the shortcomings of existing measurement methods:1)A technical scheme of warhead shock Mach angle test based on five-dot acoustic precision target is proposed.Using the principle of double-zone intercept velocity measurement and arrival time difference positioning theory,the mathematical model of the five-dot acoustic precision target under vertical incidence is established.2)Warhead shock Mach angle measurement theory and simulation.The mathematical model of the conical surface of the projectile shock wave is studied and the spatial variation characteristics of the shock wave front are analyzed by simulation.The mathematical model of the five-dot acoustic precision target was simulated and analyzed in Matlab.The simulation verified the influence of the multi-channel shock signal cross-correlation timing algorithm on the timing accuracy,and verified the correctness of the model and the timing method.3)The design of the five-dot acoustic precision target test platform.A test platform is built according to the requirements of the overall scheme of the system.The platform mainly includes two parts: the shock wave signal processing circuit and the timing module.The timing part adopts two schemes.The first scheme is the design of the five-dot matrix multi-channel pulse detection timing module based on FPGA,and the second scheme is the design of the high-speed data acquisition equipment combined with the multi-channel shock signal fast crosscorrelation timing algorithm design.The range test uses a 30 mm howitzer for live-fire testing,and the range is arranged with4m×4m targets and 3m between the front and rear targets and multiple tests.According to the experimental data calculated by the measurement parameters,the measurement results under the two schemes are basically the same,and can meet the requirements of technical indicators.