OPTIMAL AEROASSISTED ORBITAL TRANSFER INVOLVING ELLIPTICAL ORBITS (BALLISTIC FLIGHT, PLANE CHANGE, DRAG MODULATION, COPLANAR, DEORBIT). PDF Download
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Author: JENNIE RAE FREELAND JOHANNESEN Publisher: ISBN: Category : Languages : en Pages : 168
Book Description
Minimum-fuel orbital transfer between elliptical orbits is studied by first analyzing separately the three phases of aeroassisted orbital transfer (deorbit, atmospheric fly-through and post atmospheric maneuvers).
Author: JENNIE RAE FREELAND JOHANNESEN Publisher: ISBN: Category : Languages : en Pages : 168
Book Description
Minimum-fuel orbital transfer between elliptical orbits is studied by first analyzing separately the three phases of aeroassisted orbital transfer (deorbit, atmospheric fly-through and post atmospheric maneuvers).
Author: National Aeronautics and Space Administration (NASA) Publisher: Createspace Independent Publishing Platform ISBN: 9781722410049 Category : Languages : en Pages : 64
Book Description
The problem of minimization of fuel consumption during the atmospheric portion of an aeroassisted, orbital transfer with plane change is addressed. The complete mission has required three characteristic velocities, a deorbit impulse at high earth orbit (HEO), a boost impulse at the atmospheric exit, and a reorbit impulse at low earth orbit (LEO). A performance index has been formulated as the sum of these three impulses. Application of optimal control principles has led to a nonlinear, two-point, boundary value problem which was solved by using a multiple shooting algorithm. The strategy for the atmospheric portion of the minimum-fuel transfer is to start initially with the maximum positive lift in order to recover from the downward plunge, and then to fly with a gradually decreasing lift such that the vehicle skips out of the atmosphere with a flight path angle near zero degrees. Naidu, Desineni Subbaramaiah and Hibey, Joseph L. Unspecified Center...
Author: National Aeronaut Administration (Nasa) Publisher: Createspace Independent Publishing Platform ISBN: 9781722681548 Category : Languages : en Pages : 68
Book Description
The atmospheric portion of the trajectories for the aeroassisted coplanar orbit transfer was investigated. The equations of motion for the problem are expressed using reduced order model and total vehicle energy, kinetic plus potential, as the independent variable rather than time. The order reduction is achieved analytically without an approximation of the vehicle dynamics. In this model, the problem of coplanar orbit transfer is seen as one in which a given amount of energy must be transferred from the vehicle to the atmosphere during the trajectory without overheating the vehicle. An optimal control problem is posed where a linear combination of the integrated square of the heating rate and the vehicle drag is the cost function to be minimized. The necessary conditions for optimality are obtained. These result in a 4th order two-point-boundary-value problem. A parametric study of the optimal guidance trajectory in which the proportion of the heating rate term versus the drag varies is made. Simulations of the guidance trajectories are presented. Halyo, Nesim and Taylor, Deborah B. Unspecified Center...
Author: Publisher: ISBN: Category : Aeronautics Languages : en Pages : 960
Book Description
Lists citations with abstracts for aerospace related reports obtained from world wide sources and announces documents that have recently been entered into the NASA Scientific and Technical Information Database.
Author: D.Subbaram Naidu Publisher: Springer ISBN: 9783662182536 Category : Technology & Engineering Languages : en Pages : 182
Book Description
The concept of aeroassisting for orbital transfer has been recognized as one of the critical technologies for pioneering the space frontier. In space transportation systems, aeroassisting (or aerobraking), defined as the deceleration resulting from the effects of atmospheric drag upon a vehicle during orbital operations, opens new mission opportunities, especially with regard to the establishment of the permanent Space Station Freedom and space explorations to other planets such as Mars. The main areas of research reported in this monograph are atmospheric entry problem by the method of matched asymptotic expansions, coplanar and non-coplanar orbital transfers with aeroassist technology, orbital plan change with aerocruise, and neighbouring optimal guidance. A special feature is the bibliography which will provide the reader with a literature status for further research.
Author: JENNIE RAE FREELAND JOHANNESEN
Author: JENNIE RAE FREELAND JOHANNESEN
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Author: Peter Alexander Bidian
Author: Ya-Wen Shih
Author: National Aeronautics and Space Administration (NASA)
Author: Jean Pierre Marec
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Author: National Aeronaut Administration (Nasa)
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Author: D.Subbaram Naidu