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Numerical investigation of dynamic interaction with projectile and harmonic behaviour for T-finned machine gun barrels

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Defence Technology（防务技术） 2020年第2期16卷 460-469页

作者： Ekansh Chaturvedi Maulana Azad National Institute of Technology Bhopal 462003India

Machine gun barrels differ from their rifle counterparts in terms of *** support high rates of sustained fire,machine gun barrels are made thicker in order to dissipate more heat and maintain their flexural rigidity and thus accuracy,but on other hand they also contribute in weight addition to *** investigation deals with comparison between a conventional machine gun barrel and an improved innovative design having T-fins,both having same weight and chambered in 5.56×45 NATO ammunition,to compare their structural and harmonic characteristics which were parameterized by factors such as modal spectrum,directional deformation at muzzle ends during a single shot fire and harmonic behaviour at corresponding range of exciting *** solid models of both the barrels having same weight,were created using *** continuous input data functions were generated by MATLAB using the field tested discreet data *** generated velocity-distance functions were converted into time dependent functions using integration algorithms to calculate transient parameters such as time steps,excitation frequency range,angle of rotation of projectile and its angular *** dynamic condition simulated the varying nature of forces due to eccentricity in projectile and this data was fed to a time step study using ANSYS transient structural work bench followed by modal and harmonic *** results showed a significant reduction in muzzle end deformation which thus proved that the T-finned barrel,although had same weight as that of the conventional one,but had better structural and harmonic characteristics,and hence it would inherit better firing accuracy.

关键词： fshp Machine guns Pseudo-I section Second order mesh Transient behaviour

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