Download or read book Trajectory Optimization with Earth Orbit Prediction and Re entry Considerations written by M. A. Connor and published by . This book was released on 1966 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Sensitivity and Prediction Analysis of an Apollo type Earth Orbital Reentry Trajectory written by John Thomas Cox and published by . This book was released on 1970 with total page 190 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Low Earth Orbit Trajectory Optimization in the Presence of Atmospheric Uncertainty written by Aaron Jay Brown and published by . This book was released on 2022 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: The previous 20 to 25 years have seen a tremendous increase in space exploration, and with that an increase in the level of logistics planning needed to ensure mission success. For spacecraft that are designed to be periodically re-supplied, a key logistics consumable is propellant, as it constitutes the greatest up-mass on re-supply vehicles. A trajectory design strategy is therefore desired that minimizes propellant usage in order to ease the demand for propellant re-supply missions. This thesis develops such a strategy in three stages, and uses the International Space Station (ISS) as its testbed, as no other LEO spacecraft is more challenging from a space logistics standpoint. First, the ISS trajectory planning problem is formulated as a constrained burn optimization problem assuming a deterministic atmosphere. The cost function is total ∆v, with constraints imposed on longitude of ascending node (LAN) and semi-major axis (SMA) altitude. Analytic derivatives are constructed for both the cost and constraints, which are necessary given the 6-week to 2-year time frames being considered. A gradient-based optimizer is then utilized to find locally-optimal solutions to real-world ISS trajectory planning problems. Second, atmospheric uncertainty is addressed by constructing a probabilistic model of space weather data using Gaussian Processes (GPs). Bayesian inference is performed using the GP model to generate mean and covariance estimates for space weather predictions, whose pedigree is assessed against test data. The predictions are then mapped into atmospheric density via the analytic Jacchia-Roberts density model, and the effect of space weather uncertainty on orbital lifetime is examined. Third, an ISS burn execution uncertainty model is developed. This model, along with the space weather uncertainty model, are deployed in a linear covariance analysis to ascertain their combined effect on LAN and SMA altitude dispersions. The deterministic constraints from the original problem are re-formulated as stochastic constraints, where now the constraint uncertainty interval is required to fall within specified bounds. An updated optimization framework is constructed using the original ∆v cost function along with the stochastic constraints to solve the trajectory optimization problem under atmospheric uncertainty. Finally, the complete architecture is summarized for deployment in an operational setting
Download or read book Trajectory Optimization for an Apollo type Vehicle Under Entry Conditions Encountered During Lunar Return written by John W. Young and published by . This book was released on 1967 with total page 50 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 704 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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.
Download or read book ARS Journal written by American Rocket Society and published by . This book was released on 1962 with total page 2022 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Theses and Dissertations Accepted for Higher Degrees written by University of London and published by . This book was released on 1965 with total page 434 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Spacecraft Trajectory Optimization written by Bruce A. Conway and published by Cambridge University Press. This book was released on 2010-08-23 with total page 313 pages. Available in PDF, EPUB and Kindle. Book excerpt: This is a long-overdue volume dedicated to space trajectory optimization. Interest in the subject has grown, as space missions of increasing levels of sophistication, complexity, and scientific return - hardly imaginable in the 1960s - have been designed and flown. Although the basic tools of optimization theory remain an accepted canon, there has been a revolution in the manner in which they are applied and in the development of numerical optimization. This volume purposely includes a variety of both analytical and numerical approaches to trajectory optimization. The choice of authors has been guided by the editor's intention to assemble the most expert and active researchers in the various specialities presented. The authors were given considerable freedom to choose their subjects, and although this may yield a somewhat eclectic volume, it also yields chapters written with palpable enthusiasm and relevance to contemporary problems.
Download or read book Trajectory Optimization for Apollo type Vehicle Under Entry Conditions Encountered During Lunar Return with List of References written by and published by . This book was released on 1967 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Orbital Relative Motion and Terminal Rendezvous written by Jean Albert Kéchichian and published by Springer Nature. This book was released on 2021-04-12 with total page 417 pages. Available in PDF, EPUB and Kindle. Book excerpt: This book provides a comprehensive analysis of time-fixed terminal rendezvous around the Earth using chemical propulsion. The book has two main objectives. The first is to derive the mathematics of relative motion in near-circular orbit when subjected to perturbations emanating from the oblateness of the Earth, third-body gravity, and atmospheric drag. The mathematics are suitable for quick trajectory prediction and the creation of computer codes and efficient software to solve impulsive maneuvers and fly rendezvous missions. The second objective of this book is to show how the relative motion theory is applied to the exact precision-integrated, long-duration, time-fixed terminal rendezvous problem around the oblate Earth for the general elliptic orbit case. The contents are both theoretical and applied, with long-lasting value for aerospace engineers, trajectory designers, professors of orbital mechanics, and students at the graduate level and above.
Download or read book Index to Theses Accepted for Higher Degrees in the Universities of Great Britain and Ireland written by and published by . This book was released on 1966 with total page 872 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Multiple Gravity Assist Interplanetary Trajectories written by A V Labunsky and published by CRC Press. This book was released on 1998-11-26 with total page 296 pages. Available in PDF, EPUB and Kindle. Book excerpt: Reflecting the results of twenty years; experience in the field of multipurpose flights, this monograph includes the complex routes of the trajectories of a number of bodies (e.g., space vehicles, comets) in the solar system. A general methodological approach to the research of flight schemes and the choice of optimal performances is developed. Additionally, a number of interconnected methods and algorithms used at sequential stages of such development are introduced, which allow the selection of a rational multipurpose route for a space vehicle, the design of multipurpose orbits, the determination of optimal space vehicle design, and ballistic performances for carrying out the routes chosen. Other topics include the practical results obtained from using these methods, navigation problems, near-to-planet orbits, and an overview of proven and new flight schemes.
Download or read book Application of the Steepest Ascent Optimization Method to a Reentry Trajectory Problem written by and published by . This book was released on 1971 with total page 122 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Simulation and Optimization of Spacecraft Re entry Trajectories written by Derrick G. Tetzman and published by . This book was released on 2010 with total page 113 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book The Re entry Trajectory and a Re entry Optimization Problem Analysis written by Rudolf Henry Schorsch and published by . This book was released on 1964 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Reduced order Atmospheric Density Modeling for LEO Satellite Orbital Reentry Prediction written by Nicolette LeAnn Clark and published by . This book was released on 2023 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Atmospheric density modeling and uncertainty quantification for fast and accurate orbit propagation are vital to drag force estimation for satellite reentry prediction and conjunction assessment in today's increasingly cluttered Low Earth Orbit (LEO) environment. Current density models can be computationally expensive, and often contain large errors, which make density modeling a leading cause of uncertainty in drag estimation. Reduced-order atmospheric density Models (ROMs) have shown potential to provide good predictive performance at a significantly lower computational cost, by propagating a low-dimensional representation of the atmospheric density state instead of the entire density state. In this thesis, ROMs were implemented in a high-fidelity orbital propagator and tested on the problem of reentry modeling for LEO objects. First, uncertainty quantification was performed on a test case for three significant sources of uncertainty in reentry modeling to compare the impact of uncertainty from initial state, ballistic coefficient, and space weather indices on residual lifetime estimation. These results highlighted features of interest in ROM behavior relative to empirical models. Second, ROMs were used to predict reentry of three LEO object test cases. ROMs were found to provide residual lifetime estimation performance comparable to current empirical models such as JB2008 and NRLMSISE-00, with a run time reduction of up to 70\% compared to the empirical models. ROMs were especially effective for longer predictions starting two or more days prior to LEO object reentry, where in some cases ROMs outperformed both empirical models while saving hours of run time. These findings validate the utility of ROMs for orbit propagation applications such as reentry prediction.
