Accession Number : AD0289370

Title :   AN EARTH TRAJECTORY MODEL FOR SUBSURFACE BALLISTIC AND THRUSTED VEHICLES

Corporate Author : AIR FORCE SPECIAL WEAPONS CENTER KIRTLAND AFB N MEX

Personal Author(s) : CHISHOLM,PHYLLIS B. ; PUGH,FRANCIS L. ; PELZL,ROBERT M.

Report Date : SEP 1962

Pagination or Media Count : 1

Abstract : A preliminary digital computer model is developed to describe the straight line motion of a body of revolution t rough the earth's subsurface. Drag forces resulting from soil isplacement, time r te of soil strain, and kinetic friction are estimated. The following major assumptions are included: (1) The vehicle is a rigid undistorted body, (2) Major drag contribution is from the vehicle nose, (3) Homogeneous soil is subjected to plastic deformation, (4) Total soil pressure due to soil displacement and velocity acts normal to the vehicle surface, and (5) Any wave motion imparted to the soil is neglected. Drag components of normal pressure are integrated over the vehicle nose at each time instant and the resulting motion integrated with time to obtain trajectory predictions. (Au hor)

Descriptors :   *BALLISTICS, *EARTH MODELS, *SOILS, DENSITY, DIGITAL COMPUTERS, DRAG, MATHEMATICAL ANALYSIS, PLASTIC PROPERTIES, PRESSURE, SOIL MECHANICS

Distribution Statement : APPROVED FOR PUBLIC RELEASE