Missile

About: Missile is a research topic. Over the lifetime, 12829 publications have been published within this topic receiving 94307 citations. The topic is also known as: guided missile & missiles.

Assessment of Empirical Concrete Impact Formulas

Abstract: Data from 145 recent impact tests of reinforced concrete walls with solid and pipe missiles are used to assess the accuracy of several empirical formulas. For solid missiles, penetration depths greater than six-tenths the missile diameter are predicted by the NDRC formula to within —25%, scabbing is predicted equally well by the NDRC, Bechtel, and Stone and Webster formulas, and perforation is predicted best by the CEA-EDF formula. For pipe missiles, the best overall agreement with data is obtained with the NDRC formulas, using the outside diameter in the penetration equation and the equivalent solid diameter in the equations for scabbing and perforation. The limitations of all of the formulas for impact conditions outside their range of applicability are pointed out. For example, the formulas are inapplicable for highly deformable missiles such as wooden poles and autos and give only approximate results for rotating or irregularly shaped missiles such as fragments from rotating machinery.

Guidance Strategies Against Defended Aerial Targets

Abstract: The three-body engagement scenario is considered where an aerial missile, homing onto a target aircraft, encounters a defender missile launched by the aircraft. A given set of defender-missile guidance laws, namely, proportional navigation and line-of-sight guidance, are considered, and analysis is carried out for proportional navigation and pure pursuit attacking missile strategies. Analytic launch envelopes and lateral accelerations ratios for the four resulting scenarios are derived. Closed-form expressions for attackingmissile initial position and launch angles are derived for a successful evasion from the defender. Numerical simulations are carried out which comply with the analytical findings. The resulting launch envelopes are highly sensitive to the adversary’s guidance strategy, and thus, concerning practical implementation, a game theoretic analysis is carried out. Game solutions are obtained in pure and mixed strategies, resulting in the missile’s evasion probability envelope, that is, based on the four individual launch envelopes.

Biophysical mechanisms and scaling procedures applicable in assessing responses of the thorax energized by air-blast overpressures or by nonpenetrating missiles.

Abstract: : A mathematical model was devised to study the dynamic response of the thorax of mammals to rapid changes in environmental pressure and to non- penetrating missiles impacting the rib cage near the mid-lateral point of the right or left thorax. Scaling procedures are presented for similar animals relating, for a given degree of damage, the body mass of the animal to various parameters describing the exposure 'dose'. Internal pressures computed with the model for a dog exposed at the end plate of a shock-tube are compared to those measured with a pressure transducer inserted in the esophagus down to the level of the heart. Computed time-displacement histories of missiles following impact with the right side of the thorax are compared to those obtained experimentally by means of high-speed motion picture photography. High internal pressures predicted with the model for non-penetrating impact are compared to those obtained experimentally and theoretically for exposure to air blast. Experimental data are presented arbitrarily assessing lung damage in animals struck by non-penetrating missiles (constant impact area) as a function of missile mass and impact velocity. These data are compared for several missile mass-velocity combinations with those computed using the mathematical model. Similarities in the dynamic responses of the thorax to air blast and to non- penetrating missiles are discussed.