Research On Shock Wave Based Double T-Shaped Array Impact Point Detection Technology

The detection of the impact point is an important technical indicator in the shooting training process.Environmental factors or sensor factors can have a significant impact on the detection accuracy of the impact point.In the process of detecting the impact point,if a sensor malfunctions,it will cause the entire system to be paralyzed,wasting a lot of time and reducing training efficiency.In the principle of acoustic localization detection,there is a certain error in the detection of oblique firing.Therefore,this paper proposes a new sensor array method based on the shock wave effect of supersonic projectiles.We have conducted research on the fault-tolerant ability of impact point detection and the technology of oblique shooting,with specific research contents as follows.Firstly,by conducting experiments on the existing impact point detection equipment in a certain range,the advantages and disadvantages of the existing equipment were analyzed.Summarize the areas that need improvement and upgrading,and propose new sensor deployment methods and corresponding solution methods.Secondly,in order to improve the stability of the impact point detection equipment,a dual T-shaped shock pressure sensor array model with fault tolerance is proposed based on the shock wave effect of supersonic projectiles.Analyzed the working modes of dual T-shaped,I-shaped,single T-shaped,and L-shaped under different fault tolerance forms.Thirdly,in order to determine the range of shock wave pressure signals and design a reasonable target aircraft size,based on empirical formulas such as theoretical sound pressure,theoretical pressure,and time of theoretical shock wave signals during supersonic flight of projectiles,the laws of shock wave pressure signals generated by different projectiles in different flight states were analyzed.And select the sensor based on these shock wave pressure signals.Then,based on these shock pressure signals,a reasonable target size was determined.Thirdly,in order to further investigate the influence of impact point detection accuracy.Established 2D and 3D time difference calculation models for impact point detection.The prerequisite for precise detection of the impact point is that shock pressure sensors at different positions detect accurate time data.Analyze the time difference data patterns in different situations through the established mathematical model of time difference,and use MATLAB to analyze the influence of different factors in the mathematical model on the time difference data of impact point detection,and analyze the magnitude of time error in different states.By simulating the shock wave state of a projectile in supersonic flight using FLUENT,the time difference data of shock wave pressure signals at different positions are obtained and compared with the results of the established mathematical model to ensure the correctness of the model.Fourthly,based on the proposed impact point calculation model,an upper computer software for automatic detection of impact points has been developed using virtual instruments.Completed the development of the software for automatic detection of the impact point on the upper computer,and selected the hardware.The upper computer software has the function of automatically switching the calculation model of the impact point to achieve fault tolerance,displaying the location of the impact point,storing the information of the impact point,calibrating the impact point,and alarming the abnormal working conditions of the sensor.And completed the verification of shooting detection at a certain range.