Research On Kinetic Energy Parameter Test Technology Of Warhead Fragment

The prefabricated fragment warhead is accompanied by a huge release of energy during the explosion process,generating strong shock waves and high-temperature and high-pressure detonation products that damage targets.The research on key technologies for testing the damage power of fragment warheads provides important support for evaluating the power of fragment warheads.The main damage elements of fragment warheads are fragments and shock waves.Fragments rely on their kinetic energy to penetrate and damage targets.When the mass of fragments is constant,their kinetic energy depends on speed.Therefore,fragment velocity is of great significance for calculating the killing radius and area of fragment warheads,improving the charge structure,and increasing the killing power,and is a very important combat technology assessment indicator.However,in the current measurement of fragment velocity,due to the varying directions,large quantities,and density of fragment velocity vectors,as well as the presence of fire,dust,and strong vibrations in the testing environment,accurate measurement of fragment velocity is of great significance for achieving kinetic energy damage to warheads.This article mainly adopts methods such as theoretical analysis,numerical simulation,and experimental research,focusing on the speed testing method of prefabricated fragment warheads and the related characteristics of prefabricated fragment kinetic energy.The main content of this article includes the following aspects:1.Build a laser projection precision target testing platform.Using a linear laser as the light source and a photosensitive array composed of photosensitive transistors as the receiving part,combined with relevant circuits,the fragment signal passing through the light curtain is collected to achieve the encoding and output of the photosensitive sensor.According to the system design indicators,the overall system scheme was designed,and the performance of the sensor was analyzed from the aspects of optical power,device frequency response,and sensitivity.A multi-channel signal light screen detection circuit and FPGA encoding algorithm were designed,which improved the efficiency of signal acquisition and conducted theoretical verification to meet the measurement of fragment speed and target coordinates.2.Propose a kinetic energy algorithm for prefabricated fragments.Based on the principle of laser projection precision target positioning,an algorithm for calculating the velocity and coordinates of fragments passing through the screen under vertical incidence is derived;According to the actual situation,most fragments pass through the light curtain under oblique incidence conditions.The fragment kinetic energy algorithm under oblique incidence is proposed,and the accuracy of the warhead kinetic energy algorithm is verified by utilizing the convenient calculation characteristics of prefabricated fragments.The experimental results verify its feasibility.3.Error analysis and simulation.Based on the kinetic energy algorithm of fragment motion,the transfer function of positioning error is derived,and the relationship between positioning error and parameters such as fragment penetration position,laser distance,and photosensitive transistor position is analyzed;Finally,based on the characteristics of fragment motion under oblique incidence,parameter errors such as volume and incidence angle during fragment penetration were analyzed,and MATLAB simulation was conducted.The results showed the feasibility and effectiveness of the designed laser projection testing platform and fragment penetration motion algorithm.Through experiments,it has been demonstrated that the overall structure of the testing platform proposed in this project is simple and convenient for rapid testing in the field of the shooting range;The error analysis of the mathematical model shows that the overall performance of the constructed laser projection precision target testing platform meets the testing accuracy requirements,and provides a new approach for the testing and research of kinetic energy parameters of the range warhead.