Improvements to a Hybrid Algorithm for Rapid Generation of 3-D Optimal Launch Vehicle Ascent Trajectories

Idioma: inglés

Editorial: Diplom.De, 1998

3838619730 / 9783838619736

  • Tapa blanda
  • Nuevo
Ver todos los detalles

Librería: AHA-BUCH GmbH, Einbeck, AlemaniaAHA-BUCH GmbH

Vendedor de 5 estrellas

Vendedor de IberLibro desde 14 de agosto de 2006

Tapa blanda

Condición: Nuevo

EUR 38,00

Envío por EUR 60,82 
Se envía de Alemania a Estados Unidos de America

Cantidad disponible: 1 disponible

Añadir al carrito
Devoluciones gratuitas de 30 días

Descripción del artículo del vendedor

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 .…

N° de ref. del artículo 9783838619736

Título
Improvements to a Hybrid Algorithm for Rapid Generation of 3-D Optimal Launch Vehicle Ascent Trajectories
Autor
Peter F. Gath
Editorial
Diplom.De
Año de publicación
1998
Estado
Neu
Encuadernación
Taschenbuch
Idioma
inglés
ISBN 10
3838619730
ISBN 13
9783838619736
Peso del artículo
163 gramos
Dimensiones
210x148x8 mm

AHA-BUCH GmbH

Einbeck, Alemania

Vendedor de 5 estrellas

Vendedor de IberLibro desde 14 de agosto de 2006

Tarifas de envío de Alemania a Estados Unidos de America

ArtículoDe 30 a 40 días hábilesDe 7 a 14 días hábiles
Primer artículoEUR 60,82EUR 70,82
Los plazos de entrega los establecen los vendedores y varían según el transportista y la ubicación. Los pedidos que pasan por la aduana pueden sufrir retrasos y los compradores son responsables de los aranceles o tarifas asociadas. Los vendedores pueden ponerse en contacto con usted en relación con cargos adicionales para cubrir cualquier aumento en los costes de envío de los artículos.

Métodos de pago

  • Visa
  • Mastercard
  • American Express
  • Carte Bleue
  • Apple Pay
  • Google Pay
  • Cheque
  • Giro bancario
  • PayPal

Descripción de la tienda

Das Unternehmen AHA-BUCH GmbH: Seit der Gründung von AHA-BUCH im Juli 2005 ist unser Hauptziel, zufriedenen Kunden so schnell und so preisgünstig wie möglich ihren Bücherwunsch zu erfüllen. Unsere Firma beschäftigt 16 Mitarbeiter, die nur ein Ziel kennen: den Kunden und seine Wünsche! Auf über 3700 m2 Fläche haben wir über 100.000 Bücher, Modernes Antiquariat und Spiele auf Lager.

Especialidad

Kinderbücher & Kinderhör Casetten, German Books, Software, Natur & Tiere, Ratgeber, Sachbücher, Englische Bücher, Medizin & Gesundheit, Universität & Studium

Información empresarial del vendedor

AHA-BUCH GmbH

Garlebsen 48
Einbeck, Alemania 37574