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Book Scientific and Technical Aerospace Reports

Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1994 with total page 652 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book A Comparison of Steepest ascent and Second Variational Techniques in Solving a Restricted Class of Trajectory Optimization Problems

Download or read book A Comparison of Steepest ascent and Second Variational Techniques in Solving a Restricted Class of Trajectory Optimization Problems written by Ernest Celestino Luders and published by . This book was released on 1966 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Trajectory Optimization and Guidance Methods for Mars Entry

Download or read book Trajectory Optimization and Guidance Methods for Mars Entry written by Shuang Li and published by Springer Nature. This book was released on with total page 297 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book A Collection of Technical Papers

Download or read book A Collection of Technical Papers written by and published by . This book was released on 1978 with total page 360 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book ODIN System Technology Module Library 1972 1973

Download or read book ODIN System Technology Module Library 1972 1973 written by and published by . This book was released on 1978 with total page 862 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Application of Multivariable Search Techniques to Structural Design Optimization

Download or read book Application of Multivariable Search Techniques to Structural Design Optimization written by Robert Thomas Jones and published by . This book was released on 1972 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book TRAJECTORY OPTIMIZATION BY METHOD OF STEEPEST DESCENT VOLUME 1 FORMULATION

Download or read book TRAJECTORY OPTIMIZATION BY METHOD OF STEEPEST DESCENT VOLUME 1 FORMULATION written by and published by . This book was released on 1967 with total page 231 pages. Available in PDF, EPUB and Kindle. Book excerpt: Trajectory optimization by the method of steepest descent has been discussed in detail. The method has been generalized so that it has the ability to do the following: (1) Search for optimum initial values of the state variable; (2) Search for optimum time to stage; (3) Satisfy constraints which are functions of the state variable at the end of any stage; (4) Optimize functions of state variables at the end of any stage; (5) Search for optimum values of certain design parameters. A Generalized Steepest Descent computer program has been programmed for the CDC6000 Series Computer in the Fortran IV language. In its basic form the program is up to handle the three dimensional, point mass, vehicle flight path trajectory optimization problem. The program is capable of simultaneously handling up to fifteen state variables, six control variables and ten constraints. Most of the usual functions required in flight path studies are available within the program; others may be added as desired by simple program additions, providing the function or its derivative is defined analytically. The program may be readily extended to cover steepest descent optimization problems in other fields, by the replacement of the basic differential equation subroutine by any other set of equations of the same general type. Convergence to the optimal solution is obtained automatically by means of a control system which, by a series of logical decisions, obtains a reasonable perturbation magnitude at each iteration.

Book Optimization of a Corrugated Stiffened Composite Panel Under Uniaxial Compression

Download or read book Optimization of a Corrugated Stiffened Composite Panel Under Uniaxial Compression written by Banarsi Lal Agarwal and published by . This book was released on 1973 with total page 82 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Low Earth Orbit Trajectory Optimization in the Presence of Atmospheric Uncertainty

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

Book Branched Trajectory Optimization by the Method of Steepest Descent

Download or read book Branched Trajectory Optimization by the Method of Steepest Descent written by William J. Thurneck (Jr.) and published by . This book was released on 1971 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt:

Book Branched Trajectory Optimization by the Projected Gradient Technique

Download or read book Branched Trajectory Optimization by the Projected Gradient Technique written by Joseph Gera and published by . This book was released on 1969 with total page 10 pages. Available in PDF, EPUB and Kindle. Book excerpt: Branched trajectory optimization for split rocket vehicles using projected gradient or steepest descent method.

Book Steepest Descent Method and Its Application to Flight Path Optimization

Download or read book Steepest Descent Method and Its Application to Flight Path Optimization written by Subramonya A. R. Ayyar and published by . This book was released on 1967 with total page 168 pages. Available in PDF, EPUB and Kindle. Book excerpt: