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Gamma Guidance Of Trajectories For Coplanar Aeroassisted Orbital Transfer
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Book Synopsis Gamma Guidance of Trajectories for Coplanar, Aeroassisted Orbital Transfer by : National Aeronautics and Space Adm Nasa
Download or read book Gamma Guidance of Trajectories for Coplanar, Aeroassisted Orbital Transfer written by National Aeronautics and Space Adm Nasa and published by . This book was released on 2018-11-07 with total page 98 pages. Available in PDF, EPUB and Kindle. Book excerpt: The optimization and guidance of trajectories for coplaner, aeroassisted orbital transfer (AOT) from high Earth orbit (HEO) to low Earth orbit (LEO) are examined. In particular, HEO can be a geosynchronous Earth orbit (GEO). It is assumed that the initial and final orbits are circular, that the gravitational field is central and is governed by the inverse square law, and that at most three impulses are employed: one at HEO exit, one at atmospheric exit, and one at LEO entry. It is also assumed that, during the atmospheric pass, the trajectory is controlled via the lift coefficient. The presence of upper and lower bounds on the lift coefficient is considered. First, optimal trajectories are computed by minimizing the total velocity impulse (hence, the propellant consumption) required for AOT transfer. The sequential gradient-restoration algorithm (SGRA) is used for optimal control problems. The optimal trajectory is shown to include two branches: a relatively short descending flight branch (branch 1) and a long ascending flight branch (branch 2). Next, attention is focused on guidance trajectories capable of approximating the optimal trajectories in real time, while retaining the essential characteristics of simplicity, ease of implementation, and reliability. For the atmospheric pass, a feedback control scheme is employed and the lift coefficient is adjusted according to a two-stage gamma guidance law. Further improvements are possible via a modified gamma guidance which is more stable with respect to dispersion effects arising from navigation errors, variations of the atmospheric density, and uncertainties in the aerodynamic coefficients than gamma guidance trajectory. A byproduct of the studies on dispersion effects is the following design concept. For coplaner aeroassisted orbital transfer, the lift-range-to-weight ratio appears to play a more important role than the lift-to-drag ratio. This is because the lift-range-to-weight ratio controls mainly the minimum al...
Book Synopsis Optimal Aeroassisted Coplanar Orbital Transfer Using an Energy Model by : National Aeronaut Administration (Nasa)
Download or read book Optimal Aeroassisted Coplanar Orbital Transfer Using an Energy Model written by National Aeronaut Administration (Nasa) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-10 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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...
Book Synopsis Optimal Aeroassisted Coplanar Orbital Transfer Using an Energy Model by :
Download or read book Optimal Aeroassisted Coplanar Orbital Transfer Using an Energy Model written by and published by . This book was released on 1989 with total page 72 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis A Survey of Optimization, Guidance and Control of Aeroassisted Coplanar Orbital Transfer Trajectories by : Moshe Guelman
Download or read book A Survey of Optimization, Guidance and Control of Aeroassisted Coplanar Orbital Transfer Trajectories written by Moshe Guelman and published by . This book was released on 1995 with total page 110 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Scientific and Technical Aerospace Reports by :
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1991 with total page 1460 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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.
Book Synopsis Numerical Computation of Optimal Trajectories for Coplanar, Aeroassisted Orbital Transfer by : Helge Baumann
Download or read book Numerical Computation of Optimal Trajectories for Coplanar, Aeroassisted Orbital Transfer written by Helge Baumann and published by . This book was released on 1999 with total page 23 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Piecewise Constant Guidance for Aeroassisted Orbit Transfer by : Peter Alexander Bidian
Download or read book Piecewise Constant Guidance for Aeroassisted Orbit Transfer written by Peter Alexander Bidian and published by . This book was released on 1994 with total page 310 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis The Journal of the Astronautical Sciences by :
Download or read book The Journal of the Astronautical Sciences written by and published by . This book was released on 1993 with total page 668 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Optimizing Fuel Consumption for Coplanar Orbital Transfer by : Glenn Bartkowski
Download or read book Optimizing Fuel Consumption for Coplanar Orbital Transfer written by Glenn Bartkowski and published by . This book was released on 1995 with total page 44 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book IAF91-321 - IAF91-370 written by and published by . This book was released on 1988 with total page 552 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Optimal Space Trajectories by : Jean-Pierre Marec
Download or read book Optimal Space Trajectories written by Jean-Pierre Marec and published by Elsevier. This book was released on 2012-12-02 with total page 356 pages. Available in PDF, EPUB and Kindle. Book excerpt: Studies in Astronautics, Volume 1: Optimal Space Trajectories focuses on the concept of optimal transfer and the problem of optimal space trajectories. It examines the relative performances of the various propulsion systems (classical and electrical propulsions) and their optimization (optimal mass breakdown), along with parametric and functional optimizations and optimal transfers in an arbitrary, uniform, and central gravitational field. Organized into 13 chapters, this volume begins with an overview of optimal transfer and the modeling of propulsion systems. It then discusses the Hohmann transfer, the Hoelker and Silber bi-elliptical transfer, and the deficiencies of parametric optimization. The book explains the canonical transformation, optimization of the thrust law using the Maximum Principle, and optimal orbit corrections. The time-free orbital transfers and time-fixed orbital transfers and rendezvous are also discussed. Moreover, this volume explains the classical high-thrust and electric low-thrust propulsion systems and rendezvous between two planets. This book is written primarily for engineers who specialize in aerospace mechanics and want to pursue a career in the space industry or space research. It also introduces students to the different aspects of the problem of optimal space trajectories.
Book Synopsis Fuel-optimal Trajectories of Aeroassisted Orbital Transfer with Plane Change by : Desineni S. Naidu
Download or read book Fuel-optimal Trajectories of Aeroassisted Orbital Transfer with Plane Change written by Desineni S. Naidu and published by . This book was released on 1989 with total page 120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Aeroassisted Orbit Transfer Vehicle Trajectory Analysis by :
Download or read book Aeroassisted Orbit Transfer Vehicle Trajectory Analysis written by and published by . This book was released on 1988 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Government reports annual index by :
Download or read book Government reports annual index written by and published by . This book was released on 199? with total page 1120 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722334192 Total Pages :68 pages Book Rating :4.3/5 (341 download)
Book Synopsis Decomposition Technique and Optimal Trajectories for the Aeroassisted Flight Experiment by : National Aeronautics and Space Administration (NASA)
Download or read book Decomposition Technique and Optimal Trajectories for the Aeroassisted Flight Experiment written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-06 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: An actual geosynchronous Earth orbit-to-low Earth orbit (GEO-to-LEO) transfer is considered with reference to the aeroassisted flight experiment (AFE) spacecraft, and optimal trajectories are determined by minimizing the total characteristic velocity. The optimization is performed with respect to the time history of the controls (angle of attack and angle of bank), the entry path inclination and the flight time being free. Two transfer maneuvers are considered: direct ascent (DA) to LEO and indirect ascent (IA) to LEO via parking Earth orbit (PEO). By taking into account certain assumptions, the complete system can be decoupled into two subsystems: one describing the longitudinal motion and one describing the lateral motion. The angle of attack history, the entry path inclination, and the flight time are determined via the longitudinal motion subsystem. In this subsystem, the difference between the instantaneous bank angle and a constant bank angle is minimized in the least square sense subject to the specified orbital inclination requirement. Both the angles of attack and the angle of bank are shown to be constant. This result has considerable importance in the design of nominal trajectories to be used in the guidance of AFE and aeroassisted orbital transfer (AOT) vehicles. Miele, A. and Wang, T. and Deaton, A. W. Unspecified Center...
Author :National Aeronautics and Space Adm Nasa Publisher :Independently Published ISBN 13 :9781730754807 Total Pages :68 pages Book Rating :4.7/5 (548 download)
Book Synopsis Decomposition Technique and Optimal Trajectories for the Aeroassisted Flight Experiment by : National Aeronautics and Space Adm Nasa
Download or read book Decomposition Technique and Optimal Trajectories for the Aeroassisted Flight Experiment written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-11-03 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: An actual geosynchronous Earth orbit-to-low Earth orbit (GEO-to-LEO) transfer is considered with reference to the aeroassisted flight experiment (AFE) spacecraft, and optimal trajectories are determined by minimizing the total characteristic velocity. The optimization is performed with respect to the time history of the controls (angle of attack and angle of bank), the entry path inclination and the flight time being free. Two transfer maneuvers are considered: direct ascent (DA) to LEO and indirect ascent (IA) to LEO via parking Earth orbit (PEO). By taking into account certain assumptions, the complete system can be decoupled into two subsystems: one describing the longitudinal motion and one describing the lateral motion. The angle of attack history, the entry path inclination, and the flight time are determined via the longitudinal motion subsystem. In this subsystem, the difference between the instantaneous bank angle and a constant bank angle is minimized in the least square sense subject to the specified orbital inclination requirement. Both the angles of attack and the angle of bank are shown to be constant. This result has considerable importance in the design of nominal trajectories to be used in the guidance of AFE and aeroassisted orbital transfer (AOT) vehicles. Miele, A. and Wang, T. and Deaton, A. W. Unspecified Center...
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781722410049 Total Pages :64 pages Book Rating :4.4/5 (1 download)
Book Synopsis Fuel-Optimal Trajectories of Aeroassisted Orbital Transfer with Plane Change by : National Aeronautics and Space Administration (NASA)
Download or read book Fuel-Optimal Trajectories of Aeroassisted Orbital Transfer with Plane Change written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-07-07 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt: 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...
