Parametric Model And Power Field Analysis Of Typical Blast-fragmentation Warhead

In order to accurately establish a typical blast-fragmentation warhead model and analyze the influence of altitude on its power field,this paper combines the structural characteristics of the prefabricated fragment blast-fragmentation warhead to give a modeling method for the blast-fragmentation warhead,combining it on the basis of existing theory The finite element analysis software completed the research on the power field of the blast-fragmentation warhead,combined with the visual simulation technology,carried out the parameterized modeling of the blast-fragmentation warhead,the power field analysis and the research of the visual simulation technology.1)The structure of the prefabricated fragment killing warhead was studied,and the prefabricated fragment blast-fragmentation warhead model was established by the method of segmentation and layering,and the fragment arrangement algorithm of different shapes,different spacings and different layers was given.The calculation of the characteristic values of the blast-fragmentation warhead,combined with the database,completes the call,modification and storage of the model information of the blast-fragmentation warhead,and realizes the parameterized modeling of the blast-fragmentation warhead and the visual display of the two-dimensional and three-dimensional models.2)By summarizing the existing theoretical formulas,a certain range of fragments(mass distribution and quantity distribution,initial velocity of fragments at different positions,direction angles of fragments at different positions,and speed of fragments after the explosion of the prefabricated fragment killing warhead are formed Attenuation)and shock wave(peak overpressure,specific impulse,positive pressure action time)power field calculation model,combed the calculation model of the power field of the blast-fragmentation warhead under some complex conditions,and gave the process of the fragments flying of the explosive warhead and Visual display method of shock wave propagation process.3)This article uses ANSYS/LS-DYNA software to numerically simulate the power field of the anti-explosive warhead at different altitudes by changing the initial state parameters of the air model,and compare and analyze the numerical simulation data,experimental data,and theoretical data.Completed the study of the influence mechanism of altitude on the velocity attenuation of spherical tungsten steel fragments and the peak of shock wave overpressure,and corrected the velocity attenuation coefficients of 6.2mm diameter tungsten steel spherical fragments at different altitudes;verified by comparative analysis of numerical simulation and theoretical formula data The existing altitude correction formula can better predict the change law of overpressure peaks at different altitudes within the range of 0.8m/kg^(1/3)～1.5m/kg^(1/3).4)Based on QT software and OpenGL graphics library using C++programming language,a simulation analysis system for the power field of the anti-explosive warhead including a parametric modeling module,a power field analysis module,and a power field visualization module was developed.Example calculations show the whole process of the anti-explosive warhead from parametric design to power field analysis,and finally to realize the visualization of fragment power field and shock wave power field.