Topic
Projectile
About: Projectile is a research topic. Over the lifetime, 13047 publications have been published within this topic receiving 115563 citations.
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43 citations
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28 Feb 1991
TL;DR: Aerodynamic air foil surface and subsurface expressions and/or impressions of varied geometrics, angles of attack, heights and depths comprising part of a projectile surface itself to create McClain effect molecular friction/pressure/temperature reaction flight control surfaces which automatically achieve in all fluids and velocities of flight self-stabilizing spin and rotation, increased height of trajectory with corresponding enhancement of range and distance, kinetic energies, inducing smooth laminar boundary layer flows, substantially decreasing drag effects, synergistically combined to constitute a major technological improvement in performance of all projectiles
Abstract: Aerodynamical air foil surface and subsurface expressions and/or impressions of varied geometrics, angles of attack, heights and depths, comprising part of a projectile surface itself to create McClain effect molecular friction/pressure/temperature reaction flight control surfaces which automatically achieve in all fluids and velocities of flight self-stabilizing spin and rotation, increased height of trajectory with corresponding enhancement of range and distance, kinetic energies, inducing smooth laminar boundary layer flows, substantially decreasing drag effects, synergistically combined to constitute a major technological improvement in performance of all projectiles. Projectile having plurality rotatable sections with aerodynamic air foil surfaces provides self-stabilized spin projectile with sections rotating in opposite directions.
43 citations
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TL;DR: In this paper, an experimental investigation of the forces produced by the penetration and perforation of thin aluminum and steel plates by cylindro-conical and hemispherically-tipped projectiles at 0, 15, 30 and 45° angles of incidence has been performed.
43 citations
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TL;DR: In this article, a model for the electromagnetic force in a parallel augmented railgun and a friction model for a brush projectile are presented, and the kinematics of the projectile in the gun are simulated with these models and are compared to the measured velocity.
Abstract: One of the main issues of railguns is the ablation of the rails due to the existence of a plasma arc occurring at high currents. To avoid the heat load on the rails, it is necessary to reduce the current intensities. The use of a parallel augmented railgun is one method of lowering the current without reducing the electromagnetic force on the projectile. One- and two-brush projectiles have been fired in a parallel augmented railgun with a 15 mm /spl times/ 15 mm caliber and with a barrel length of 1.5 m. These experiments have shown that the maximum kinetic energy at the muzzle-without the transition of the solid contact between the rails and the brush to a plasma contact-can be significantly increased in an augmented railgun. The maximum kinetic energy has increased by a factor of 5 for one-brush projectiles and by a factor of 9 for two-brush projectiles. A model for the electromagnetic force in the augmented railgun and a friction model for the brush projectile are presented. The kinematics of the projectile in the gun are simulated with these models and are compared to the measured velocity. A good agreement is obtained.
43 citations
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01 Jan 2007TL;DR: In this paper, a model is developed to investigate the dynamic response of an electromagnetic railgun structure induced by a moving magnetic pressure during launch of projectiles, and the results of numerical simulation of the bore deformation are presented in this paper under applied loads.
Abstract: A model is developed to investigate the dynamic response of an electromagnetic railgun structure, induced by a moving magnetic pressure during launch of projectiles. When railgun armature velocity achieves critical velocity, resonance in railgun can occur and cause high amplitude stress and strain in armatures passage and causes life decreasing and damaging in rails. Critical velocity can be considered as one of the railgun dynamic design parameters. In this study, governing equations for rails under dynamic loading conditions has been investigated. Armature critical velocity according to design parameters has also been studied. The results show that dynamic response of the EM barrel becomes critical for increased projectile velocity and lightweight barrel designs. Also, the results of numerical simulation of the bore deformation are presented in this paper under applied loads. The algorithm is used to study the dynamics of tensile stresses near the electrode surface. Accordingly, the model that accounts for projectile velocity and gun construction can be used to guide and improve barrel design
43 citations