
Accession Number : ADA303109
Title : Full Lyapunov Exponent Placement In Reentry Trajectories.
Descriptive Note : Master's thesis,
Corporate Author : AIR FORCE INST OF TECH WRIGHTPATTERSON AFB OH SCHOOL OF ENGINEERING
Personal Author(s) : Platt, Michael H.
PDF Url : ADA303109
Report Date : DEC 1995
Pagination or Media Count : 103
Abstract : This study investigated the ability to control the chaotic reentry of a DeltaClipper like vehicle by setting the values of initial arid final principal dynamical directions as well as the Lyapunov exponents. A model of the original controlled reentry vehicle was created through the use of the equations of motion in conjunction with an atmospheric model. A modified linear quadratic regulator allowed the set up of a boundary value problem which specified the Lyapunov exponents and determined the gain matrix as a function of time. The gain matrix can eventually be used in the control system of the vehicle. (AN)
Descriptors : *ALGORITHMS, *ATMOSPHERE ENTRY, STABILIZATION, VELOCITY, MATHEMATICAL MODELS, REENTRY VEHICLES, LINEAR SYSTEMS, OPTIMIZATION, EQUATIONS OF MOTION, TIME DEPENDENCE, ACCELERATION, CHAOS, MATRICES(MATHEMATICS), ORIENTATION(DIRECTION), THESES, ANGLE OF ATTACK, BOUNDARY VALUE PROBLEMS, AERODYNAMIC DRAG, CONVERGENCE, CONTROL THEORY, DYNAMIC PROGRAMMING, ALTITUDE, FLIGHT PATHS, TRAJECTORIES, OPEN LOOP SYSTEMS, AERODYNAMIC LIFT, ATMOSPHERE MODELS, CLOSED LOOP SYSTEMS, LAUNCH VEHICLES, LYAPUNOV FUNCTIONS.
Subject Categories : Spacecraft Trajectories and Reentry
Distribution Statement : APPROVED FOR PUBLIC RELEASE