Accession Number : AD0715611

Title :   Numerical Solutions on the Astronautical Problem of Thrust Vector Control for Optimum Solar Sail Transfer,

Corporate Author : GENERAL ELECTRIC CO PHILADELPHIA PA MISSILE AND SPACE DIV

Personal Author(s) : Cavoti,C. R.

Report Date : MAR 1963

Pagination or Media Count : 62

Abstract : The problem of optimum orbital transfer by means of best control of a solar radiation pressure thrusting device is considered. The method of analysis is based on a general approach using the indirect variational techniques. The study presented is concerned with the problem of optimum solar sail orbital transfer, such that the vehicle departing from an initial circular orbit arrives with maximum orbit velocity (also called injection velocity) at a given distance from the Sun. For those cases where the maximum orbit velocity, at the given distance from the Sun, corresponds with elliptical orbit velocity, the variational problem considered is therefore equivalent to an orbital transfer with maximum 'visviva' or to the ellipse of maximum semi-major axis. In this work the boundary value problem associated with the natural and physical end-conditions is solved numerically and a generalized graphical construction solving for the initial values of the multipliers, for given final radius (or distance from the Sun), is presented. (Author)

Descriptors :   (*SOLAR SAILS, THRUST VECTOR CONTROL SYSTEMS), (*TRANSFER TRAJECTORIES, OPTIMIZATION), BOUNDARY VALUE PROBLEMS, CIRCULAR ORBITS, INTERPLANETARY TRAJECTORIES, EQUATIONS OF MOTION, SPACE NAVIGATION, NUMERICAL ANALYSIS

Subject Categories : Spacecraft Trajectories and Reentry

Distribution Statement : APPROVED FOR PUBLIC RELEASE