Improvements to a Hybrid Algorithm for Rapid Generation of 3-D Optimal Launch Vehicle Ascent Trajectories
Language: English
Published by Diplom.De, 1998
- Softcover
- New
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nach der Bestellung gedruckt Neuware - Printed after ordering - Diploma Thesis from the year 1998 in the subject Engineering - Aerospace Technology, grade: 1,0, University of Stuttgart (Luft- und Raumfahrttechnik, Flugmechanik und Flugregelung), language: English, abstract: 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:SummaryiAcknowledgementsiiContentsiiiNomenclaturevFiguresviiiIntroduction11.Problem description31.1Describing the final orbit31.2Coordinate frame51.3Dynamic system61.4Initial conditions71.5Path constraints71.6Performance index71.7Terminal constraints81.8Solution method81.9Non-dimensionalization of the variables92.Solving the two-point boundary value problem102.1Vacuumsolution102.1.1Simplified model equations102.1.2Optimal control for vacuum solution112.1.3Thrust integrals and closed form solution for ascent in vacuum122.2Atmospheric solution132.2.1Dynamic system and collocation variables132.2.2Optimality condition to solve for 1b142.2.3Differential equations for the costate variables162.3Terminal constraints162.3.1Attaching at perigee172.3.2Free attachment point172.4Transversality conditions182.4.1Final costates for attaching at perigee182.4.2Final costates for free attachment point192.4.3Equatorial orbits222.5Adjusting final time222.6Computation procedure232.7Numerical results243.Low thrust upper stages273.1Typical low thrust case273.2Problems with low thrust upper stages283.3Upper stage modification303.4Advantage of free attachment point for low thrust upper stage vehicles324.Path constraints334.1Axial acceleration constraint334.2Normal force constraint344.3Angle of attack constraint354.4Additional homotopy phase to introduce constraints375Coast arcs385.1Propagating states385.2Propagating costates435.3Adjusting coast arc position and duration455.3.1Optimizing coast arc duration465.3.2Optimizing start and end time of coast arc485.3.3Optimizing n optimal burn arcs495.3.4Inserting additional coast arcs516.Numerical results with coast arc and suggestions for future improvements536.1Ascent to equatorial orbit536.2Behavior of Hamiltonian606.3Comparison to OTIS results616.4Suggestions to improve convergence627.Conclusions and recommendations for future work67References70Appendix A - Obtaining the derivatives for the free attachment point constraint72Appendix B - Obtaining the derivatives for the inclination constraint75Appendix C - Calculation of the .…
Seller Inventory # 9783838619736
- Title
- Improvements to a Hybrid Algorithm for Rapid Generation of 3-D Optimal Launch Vehicle Ascent Trajectories
- Author
- Peter F. Gath
- Publisher
- Diplom.De
- Publication year
- 1998
- Condition
- Neu
- Binding
- Taschenbuch
- Language
- English
- ISBN 10
- 3838619730
- ISBN 13
- 9783838619736
- Item weight
- 163 grams
- Dimensions
- 210x148x8 mm
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