Read Books Online and Download eBooks, EPub, PDF, Mobi, Kindle, Text Full Free.
Analysis And Design Of Propulsive Guidance For Atmospheric Skip Entry Trajectories
Download Analysis And Design Of Propulsive Guidance For Atmospheric Skip Entry Trajectories full books in PDF, epub, and Kindle. Read online Analysis And Design Of Propulsive Guidance For Atmospheric Skip Entry Trajectories ebook anywhere anytime directly on your device. Fast Download speed and no annoying ads. We cannot guarantee that every ebooks is available!
Book Synopsis Analysis and Design of Propulsive Guidance for Atmospheric Skip Entry Trajectories by : Garrett Oliver Teahan
Download or read book Analysis and Design of Propulsive Guidance for Atmospheric Skip Entry Trajectories written by Garrett Oliver Teahan and published by . This book was released on 2006 with total page 164 pages. Available in PDF, EPUB and Kindle. Book excerpt: A study of the ability to use propulsive guidance for atmospheric skip entry trajectories was completed. The analysis centered itself around the proposed design of NASA's Crew Exploration Vehicle. The primary aerodynamic guidance system must execute an atmospheric skip maneuver when attempting to reach distant landing sites. These maneuvers result in the loss of aerodynamic control authority during the skip phase. The physics of the problem were studied through an analysis of the minimum impulsive AV. This analysis was completed for a number of different trajectories with varying energies. The framework of the propulsive guidance algorithm, derived from the Powered Explicit Guidance law of the Space Shuttle, was presented and the augmented design was explained. The sensitivity of the propulsive guidance solution to a given trajectory was explored as well as its response to altitude constrained maneuverability. The robustness of the algorithm is measured using Monte Carlo techniques. The results showed that the current design of the Crew Exploration Vehicle and the current implementation of the primary aerodynamic guidance system are inadequate for a precise, long range, crewed return from the Moon. It was also shown that the lower energy trajectories are more favorable given the altitude reorientation constraint. It was recommended that the skip phase be redefined such that it does not begin until the altitude reorientation constraint is met. It was shown that a combination of increasing the total amount of thrust available, AV allowance, and the entry guidance precision are necessary to bring the success rate to acceptable levels for a precise, long range, crewed return from the Moon.
Book Synopsis Development and Simulation of an Analytical Earth Skip Re-entry Guidance Algorithm by : Sarah D'Souza
Download or read book Development and Simulation of an Analytical Earth Skip Re-entry Guidance Algorithm written by Sarah D'Souza and published by ProQuest. This book was released on 2008 with total page 92 pages. Available in PDF, EPUB and Kindle. Book excerpt: In the field of Guidance development for spacecraft there are many algorithms that utilize different techniques depending on the mission requirements and type of spacecraft. In this thesis, high L/D and low L/D guidance schemes were considered in order to determine a feasible and robust scheme for a skip entry of a low L/D spacecraft. It was concluded from a comprehensive literature review that there was a lack of viable analytical schemes for a low L/D spacecraft performing a skip entry. Thus, this thesis attempts to make a contribution to the field of low L/D guidance through the adaptation of the Shuttle Entry Guidance equations to perform a skip entry. The primary advantage to the shuttle algorithm is that the equations derived from the re-entry equations of motion are in general form. This means that these expressions could be applied to any type of vehicle (low or high L/D) with the same general assumptions. This research yielded viable analytic expressions for the drag profile and other trajectory variables. In addition, it was found that assuming the flight path angle is equal to zero is invalid and one must maintain the flight path angle term in the longitudinal equations of motion. A baseline algorithm was developed and integrated into the SORT Simulation. The Analytical Skip Entry Guidance algorithm flew a baseline trajectory that was nearly equal to the nominal trajectory and performed a skip trajectory. A ranging technique was integrated into the baseline algorithm, which showed an improvement of the altitude profile as compared to the baseline simulation from Chapter 5. However, the ranging technique does not pull the range error within the 2% threshold of nominal. The resulting 3.2% error from the nominal range is a manageable error because in time the error accumulations can be resolved. The ASEG algorithm has met all three of our objectives. First, we successfully implemented an analytical algorithm and have built a foundation by which we can make many improvements. Second, the ASEG algorithm applies dynamic reference trajectories in order to guide the vehicle to the correct position. Finally, the ASEG algorithm successfully flew a skip trajectory such that the vehicle skipped out of the atmosphere and descended for a 2nd entry.
Book Synopsis Advances in Spacecraft Atmospheric Entry Guidance by : Joel Benito Manrique
Download or read book Advances in Spacecraft Atmospheric Entry Guidance written by Joel Benito Manrique and published by . This book was released on 2010 with total page 197 pages. Available in PDF, EPUB and Kindle. Book excerpt: In order to advance entry guidance technology two different research areas have been explored with the objective of increasing the reachable landing area and the landing accuracy for future Mars missions. Currently only the northern hemisphere of Mars is available for landing due to its low elevation. Only low elevation landing sites have the necessary atmospheric density to allow landing using current Entry, Descent and Landing (EDL) technology. In order to reach most of the Ancient Highlands, the majority of the southern hemisphere, advanced EDL technology is needed in multiple fields, including entry guidance. The first research area is the definition and applications of reachable and controllable sets for entry. The definition of the reachable and controllable sets provides a framework for the study of the capabilities of an entry vehicle in a given planet. Reachable and controllable sets can be used to comprehensively characterize the envelope of trajectories that a vehicle can fly, the sites it can reach and the entry states that can be accommodated. The sets can also be used for the evaluation of trajectory planning algorithms and to assist in the selection of the entry or landing sites. In essence, the reachable and controllable sets offer a powerful vehicle and trajectory analysis and design framework that allows for better mission design choices. In order to illustrate the use of the sets, they are computed for a representative Mars mission using two different vehicle configurations. The sets characterize the impact of the vehicle configuration on the entry capability. Furthermore, the sets are used to find the best skip-entry trajectory for a return from the Moon mission, highlighting the utility of the sets in atmospheric maneuvers other than entry. The second research area is the development of the components of an entry guidance algorithm that allow high elevation landing and provide as well high landing accuracy. The approach taken follows the acceleration guidance approach successfully used in missions like the Space Shuttle. Based on this approach, a new planner has been developed that is computationally fast and provides trajectories with both high final altitude and high control authority. A new tracking law based on nonlinear predictive control has been developed to track the reference trajectory. The new tracking law accounts for control saturation, which is a common feature of trajectories in the thin Martian atmosphere with a low lift vehicle. Finally, a final position guidance algorithm that aligns the vehicle's heading towards the target and provides altitude and range control, has been developed. The new guidance algorithm provides increased accuracy as well as higher final altitude compared to an entry guidance algorithm representative of the current capabilities.
Book Synopsis Study of a Guidance Scheme Using Approximate Solutions of Trajectory Equations to Control the Aerodynamic Skip Flight of a Reentry Vehicle by : Robert Scott Dunning
Download or read book Study of a Guidance Scheme Using Approximate Solutions of Trajectory Equations to Control the Aerodynamic Skip Flight of a Reentry Vehicle written by Robert Scott Dunning and published by . This book was released on 1963 with total page 48 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Design of Trajectory Optimization Approach for Space Maneuver Vehicle Skip Entry Problems by : Runqi Chai
Download or read book Design of Trajectory Optimization Approach for Space Maneuver Vehicle Skip Entry Problems written by Runqi Chai and published by Springer. This book was released on 2019-07-30 with total page 207 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book explores the design of optimal trajectories for space maneuver vehicles (SMVs) using optimal control-based techniques. It begins with a comprehensive introduction to and overview of three main approaches to trajectory optimization, and subsequently focuses on the design of a novel hybrid optimization strategy that combines an initial guess generator with an improved gradient-based inner optimizer. Further, it highlights the development of multi-objective spacecraft trajectory optimization problems, with a particular focus on multi-objective transcription methods and multi-objective evolutionary algorithms. In its final sections, the book studies spacecraft flight scenarios with noise-perturbed dynamics and probabilistic constraints, and designs and validates new chance-constrained optimal control frameworks. The comprehensive and systematic treatment of practical issues in spacecraft trajectory optimization is one of the book’s major features, making it particularly suited for readers who are seeking practical solutions in spacecraft trajectory optimization. It offers a valuable asset for researchers, engineers, and graduate students in GNC systems, engineering optimization, applied optimal control theory, etc.
Book Synopsis Dynamics of Atmospheric Re-Entry by : Frank J. Regan
Download or read book Dynamics of Atmospheric Re-Entry written by Frank J. Regan and published by AIAA. This book was released on 1993 with total page 616 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 1964 with total page 834 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Managing Energy and Mode Transitions in Skip Entry Guidance for Lunar Return Trajectories by : Melanie Ann Miller (S. M.)
Download or read book Managing Energy and Mode Transitions in Skip Entry Guidance for Lunar Return Trajectories written by Melanie Ann Miller (S. M.) and published by . This book was released on 2007 with total page 231 pages. Available in PDF, EPUB and Kindle. Book excerpt: Skip entry trajectories provide a technique for returning an astronaut crew from the Moon to a continental United States landing site at any time during the lunar month. This approach to atmospheric entry requires that the guidance system be capable of precisely targeting a vast array of downrange distances. To meet this objective, Draper Laboratory has developed a baseline skip entry guidance algorithm which is a blend of the original Apollo guidance logic and a numeric targeting algorithm, PredGuid, that is used for the skip portion of the entry. The addition of PredGuid greatly improved the algorithm's performance for skip trajectories, but numerous simplifications and Apollo-based empirical relationships still limit the capability of the algorithm and may be unsuitable for other vehicle configurations. This thesis presents enhancements to the Draper baseline which redesign the energy management system and phase transition logic. A model-based predictor has been developed to determine the type of trajectory that is necessary to cover the target range and the appropriate time to transition to the next flight mode, based on the trajectory type. The direct entry capability has been improved and expanded by incorporating a variable constant drag policy to manage energy, and by designing specific direct entry reference trajectories which are used by the path-following controller in the final descent phase. In addition, an intermediate loft regime is introduced to bridge the range capability between direct and skip entries. These upgrades to the baseline algorithm greatly improve its robustness to uncertainties encountered through the entry, as demonstrated via Monte Carlo simulations, using the Crew Exploration Vehicle capsule concept. This algorithm design also offers the ability to optimize a skip trajectory to meet a particular set of objectives by modifying the reference skip bank angle.
Book Synopsis Unified Guidance Analysis in Design of Space Trajectories by : T. T. Soong
Download or read book Unified Guidance Analysis in Design of Space Trajectories written by T. T. Soong and published by . This book was released on 1964 with total page 19 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 1980 with total page 830 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Aerocapture Guidance Methods for High Energy Trajectories by : Jennifer Lee DiCarlo
Download or read book Aerocapture Guidance Methods for High Energy Trajectories written by Jennifer Lee DiCarlo and published by . This book was released on 2003-05-01 with total page 149 pages. Available in PDF, EPUB and Kindle. Book excerpt: This thesis investigates enhancements of an existing numerical predictor-corrector aerocapture guidance algorithm (PredGuid). The study includes implementation of an energy management phase prior to targeting with a generic method of transition and replacement of heuristic features with more generic features. The vehicle response during energy management was modeled as a second-order spring/mass/damper system. Phase change occurred when two conditions were met: First, the vehicle could fly a constant bank angle of 1100 for the remainder of the trajectory and have the resulting apogee below or within a given tolerance above the target apogee. Second, the predicted final energy indicated that the vehicle would be on an elliptical, not hyperbolic, trajectory. So as to incorporate generic features, modeling of a separate lift down phase was replaced by using a lift-down condition to determine phase change and biasing to the same lift- down condition during targeting. Also, use of a heuristic sensitivity to calculate the first corrected bank angle was replaced by a simple smart guessing' algorithm. Finally, heuristic lateral corridor boundaries were replaced by boundaries based on percentage of forward velocity.
Book Synopsis A Study of Guidance to Reference Trajectories for Lifting Reentry at Supercircular Velocity by : Rodney C. Wingrove
Download or read book A Study of Guidance to Reference Trajectories for Lifting Reentry at Supercircular Velocity written by Rodney C. Wingrove and published by . This book was released on 1963 with total page 64 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Manned Spacecraft Design Principles by : Pasquale M. Sforza
Download or read book Manned Spacecraft Design Principles written by Pasquale M. Sforza and published by Elsevier. This book was released on 2015-11-13 with total page 649 pages. Available in PDF, EPUB and Kindle. Book excerpt: Manned Spacecraft Design Principles presents readers with a brief, to-the-point primer that includes a detailed introduction to the information required at the preliminary design stage of a manned space transportation system. In the process of developing the preliminary design, the book covers content not often discussed in a standard aerospace curriculum, including atmospheric entry dynamics, space launch dynamics, hypersonic flow fields, hypersonic heat transfer, and skin friction, along with the economic aspects of space flight. Key concepts relating to human factors and crew support systems are also included, providing users with a comprehensive guide on how to make informed choices from an array of competing options. The text can be used in conjunction with Pasquale Sforza's, Commercial Aircraft Design Principles to form a complete course in Aircraft/Spacecraft Design. Presents a brief, to-the-point primer that includes a detailed introduction to the information required at the preliminary design stage of a manned space transportation system Involves the reader in the preliminary design of a modern manned spacecraft and associated launch vehicle Includes key concepts relating to human factors and crew support systems Contains standard, empirical, and classical methods in support of the design process Culminates in the preparation of a professional quality design report
Book Synopsis Optimal Trajectories in Atmospheric Flight by : Nguyen Vinh
Download or read book Optimal Trajectories in Atmospheric Flight written by Nguyen Vinh and published by Elsevier. This book was released on 2012-12-02 with total page 421 pages. Available in PDF, EPUB and Kindle. Book excerpt: Optimal Trajectories in Atmospheric Flight deals with the optimization of trajectories in atmospheric flight. The book begins with a simple treatment of functional optimization followed by a discussion of switching theory. It then presents the derivation of the general equations of motion along with the basic knowledge in aerodynamics and propulsion necessary for the analysis of atmospheric flight trajectories. It goes on to the study of optimal trajectories by providing the general properties of the optimal aerodynamic controls and the integrals of motion. This is followed by discussions of high subsonic and supersonic flight, and approximation techniques to reduce the order of the problem for a fast computation of the optimal trajectory. The final chapters present analyses of optimal reentry trajectories and orbital maneuvers. This book is intended as a reference text for scientists and engineers wanting to get into the subject of optimal trajectories in atmospheric flight. If used for teaching purposes, the book is written in a self-contained way so that a selective use of the material is at the discretion of the lecturer. The first 11 chapters are sufficient for a one-semester course with emphasis on optimal maneuvers of high performance aircraft.
Book Synopsis Re-entry Vehicle Dynamics by : Frank J. Regan
Download or read book Re-entry Vehicle Dynamics written by Frank J. Regan and published by . This book was released on 1984 with total page 442 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Design Guide to Orbital Flight by : Martin Company
Download or read book Design Guide to Orbital Flight written by Martin Company and published by . This book was released on 1962 with total page 960 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Atmospheric Re-Entry Vehicle Mechanics by : Patrick Gallais
Download or read book Atmospheric Re-Entry Vehicle Mechanics written by Patrick Gallais and published by Springer Science & Business Media. This book was released on 2007-09-23 with total page 365 pages. Available in PDF, EPUB and Kindle. Book excerpt: Based on a long engineering experience, this book offers a comprehensive and state-of-the-art analysis of aerodynamic and flight mechanic entry topics. This updated edition had new chapters on Re-entry on Mars mission, flight quality, rarefied aerodynamics and re-entry accuracy. In addition, it provides a large set of application exercises and solutions.
