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Author : Fred Teren,Omer F. Spurlock
Publisher : Unknown
Page : 58 pages
File Size : 52,6 Mb
Release : 1969
Category : Launch vehicles (Astronautics)
ISBN : UIUC:30112101603303
Author : Peter F. Gath
Publisher : diplom.de
Page : 99 pages
File Size : 40,8 Mb
Release : 1999-12-15
Category : Technology & Engineering
ISBN : 9783832419738
Inhaltsangabe:Abstract: This thesis presents improvements to FLOAT, a hybrid analytical/numerical algorithm for rapid generation of three dimensional, optimal launch vehicle ascent trajectories. Improvements have been made to the terminal constraints, which are now available in a more general form to allow for an optimal attachment point to the target orbit.The existing algorithm also has been extended with logic that allows for vehicles with low thrust to weight ratios in the upper stage and successful convergence of problems with path constraints for normal force and angle of attack Another major extension made to the code is the introduction of coasting arcs. Coasting arcs are implemented using a completely analytical solution for the prediction of states and costates as well as for the required sensitivity matrix. This allows for a very fast and accurate calculation even with long coasting arcs. Finally, an approach for the optimization of start and end time of coast arcs is presented.This approach was implemented and the results of a test case compare very well with results generated with OTIS for the same case. At the end, suggestions for future development are made. Inhaltsverzeichnis:Table of Contents: Summaryi Acknowledgementsii Contentsiii Nomenclaturev Figuresviii Introduction1 1.Problem description3 1.1Describing the final orbit3 1.2Coordinate frame5 1.3Dynamic system6 1.4Initial conditions7 1.5Path constraints7 1.6Performance index7 1.7Terminal constraints8 1.8Solution method8 1.9Non-dimensionalization of the variables9 2.Solving the two-point boundary value problem10 2.1Vacuumsolution10 2.1.1Simplified model equations10 2.1.2Optimal control for vacuum solution11 2.1.3Thrust integrals and closed form solution for ascent in vacuum12 2.2Atmospheric solution13 2.2.1Dynamic system and collocation variables13 2.2.2Optimality condition to solve for 1b14 2.2.3Differential equations for the costate variables16 2.3Terminal constraints16 2.3.1Attaching at perigee17 2.3.2Free attachment point17 2.4Transversality conditions18 2.4.1Final costates for attaching at perigee18 2.4.2Final costates for free attachment point19 2.4.3Equatorial orbits22 2.5Adjusting final time22 2.6Computation procedure23 2.7Numerical results24 3.Low thrust upper stages27 3.1Typical low thrust case27 3.2Problems with low thrust upper stages28 3.3Upper stage modification30 3.4Advantage of free attachment point for low thrust [...]
Author : Omer F. Spurlock
Publisher : Unknown
Page : 36 pages
File Size : 53,9 Mb
Release : 1970
Category : Calculus of variations
ISBN : UIUC:30112106691626
Analysis, procedure, and results are presented for maximizing payload capability for trajectories to circular synchronous equatorial orbit where thea pogee motor total impulse is much smaller than optimum. The trajectories begin at launch and are numerically integrated to insertion into the final orbit. Constraints on parking orbit perigee radius and duration are included. These trajectories, unlike conventional synchronous orbit trajectories, were found to require noncircular parking orbits and large amounts of inclination reduction before the apogee burn. The analysis and procedure were also applied to the conventional circular synchronous equatorial orbit problem where the burn and coast durations are optimum. Results are presented for the Applications Technology Satellite (ATS)-E missiod, which is an example of a problem where the apogee motor is small, and for the conventional case where the apogee motor is of optimum size.
Author : Anonim
Publisher : Unknown
Page : 540 pages
File Size : 52,9 Mb
Release : 1976
Category : Electronic
ISBN : MINN:31951000846561Z
Author : Milton D. McLaughlin
Publisher : Unknown
Page : 802 pages
File Size : 43,8 Mb
Release : 1970
Category : Airplanes
ISBN : UFL:31262083080548
Three displays were evaluated on a piloted simulator, each of which provided information which could be used in thrust management. The three displays were (1) rate of change of speed, (2) potential flight-path angle, and (3) potential rate of climb. Results are presented in the form of time histories, histograms, and pilot comments. The results include comparisons of flight-path and speed control and throttle activity with and without each display and pilot comments.
Author : United States. National Aeronautics and Space Administration Scientific and Technical Information Division
Publisher : Unknown
Page : 966 pages
File Size : 51,7 Mb
Release : 1970
Category : Aeronautics
ISBN : STANFORD:36105113793769
Author : United States. National Aeronautics and Space Administration. Scientific and Technical Information Division
Publisher : Unknown
Page : 470 pages
File Size : 53,5 Mb
Release : 1969
Category : Aeronautics
ISBN : CORNELL:31924057848859
Author : United States. National Aeronautics and Space Administration. Scientific and Technical Information Division
Publisher : Unknown
Page : 956 pages
File Size : 43,5 Mb
Release : 1970
Category : Science
ISBN : NASA:31769000659238
Author : Anonim
Publisher : Unknown
Page : 392 pages
File Size : 47,9 Mb
Release : 1994
Category : Aeronautics
ISBN : MINN:31951P00495611F
Author : Anonim
Publisher : Unknown
Page : 128 pages
File Size : 49,6 Mb
Release : 1969
Category : Government publications
ISBN : UCR:31210023919119
Author : United States. Superintendent of Documents
Publisher : Unknown
Page : 1320 pages
File Size : 44,7 Mb
Release : 1966
Category : Government publications
ISBN : WISC:89035089036
Author : United States. Superintendent of Documents
Publisher : Unknown
Page : 1348 pages
File Size : 51,6 Mb
Release : 1970
Category : United States
ISBN : STANFORD:36105019598304
Author : Janos Borsody
Publisher : Unknown
Page : 52 pages
File Size : 52,8 Mb
Release : 1976
Category : Orbital rendezvous (Space flight)
ISBN : UIUC:30112106915470
Author : Anonim
Publisher : Unknown
Page : 224 pages
File Size : 49,9 Mb
Release : 1969
Category : Science
ISBN : UIUC:30112101037965
Author : Anonim
Publisher : Unknown
Page : 568 pages
File Size : 48,8 Mb
Release : 1972
Category : Mechanics, Applied
ISBN : UCAL:C2682438