Accession Number : AD0287881

Title :   OPTIMUM SOFT LANDING TRAJECTORIES. PART 2: NUMERICAL RESULTS

Corporate Author : MASSACHUSETTS INST OF TECH CAMBRIDGE

Personal Author(s) : BERMAN,LAWRENCE J.

Report Date : 30 MAR 1962

Pagination or Media Count : 1

Abstract : The optimum steering program for landing on an airless body is examined numerically with particular emphasis on the change in the form of the steering progam and the degradation of performance under the influence of a restraint on the ignition altitude. It is found that for ignition altitudes not far below the optimm, the perform-ANCE LOSS IS SMALL, AND THAT THE IGNITION ALTITUDE FOR WHICH THE OPTIMUM STEERING PROGRAM IS A CONSTANT ANGLE FALLS WITHIN THIS RANGE. Thus it is concluded that the constant-thrust-angle trajectory is optimum in an operational system. This conclusion is vaid only for relatively steep approach trajectories. (Author)

Descriptors :   *ORBITS, CALCULUS OF VARIATIONS, EQUATIONS, FLIGHT TESTING, LANDING IMPACT, LUNAR PROBES, MOON, MOTION, SPACE FLIGHT, SPACECRAFT, THEORY, VIBRATION ISOLATERS

Distribution Statement : APPROVED FOR PUBLIC RELEASE