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An Automated Procedure For The Optimization Of Practical Aerospace Structures
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Book Synopsis An Automated Procedure for the Optimization of Practical Aerospace Structures by : Walter J. Dwyer
Download or read book An Automated Procedure for the Optimization of Practical Aerospace Structures written by Walter J. Dwyer and published by . This book was released on 1971 with total page 210 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report documents the development of a new structural optimization algorithm, which is a combination of a modified fully stressed design technique and a redesign procedure based on gradients to deflection constraint surfaces. The algorithm is incorporated into a large finite element program based on the displacement method of structural analysis. Using an IBM 360/75 computer, the program is capable of obtaining near optimum distributions of material for structural idealizations consisting of up to three thousand elements and six thousand degrees of freedom, and subjected to a maximum of twenty loading conditions. Constraints may be placed on the maximum and minimum size of any of the elements, on the stresses in the elements, and on the displacements of the nodal points of the structure. Several examples of structures that were optimized are included to demonstrate the various features of the program, and to compare results with previously obtained solutions. To help make the program useful in the design of major aircraft structures, care has been taken to simplify the input and to present the program output in a form that is meaningful to the aircraft stress engineer. Results of an exploratory investigation into the optimization of dynamically loaded structures are presented, and the conversion of two existing blast-response shell codes into a unified synthesis program is documented.
Book Synopsis An Automated Procedure for the Optimization of Practical Aerospace Structures. Volume II. Technical Programmer's Manual by : Walter J. Dwyer
Download or read book An Automated Procedure for the Optimization of Practical Aerospace Structures. Volume II. Technical Programmer's Manual written by Walter J. Dwyer and published by . This book was released on 1971 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report documents the computer programs described in Volume I of this report entitled 'An Automated Procedure for the Optimization of Practical Aerospace Structures' (AD-726 112). Both the main structural optimization program and the shell dynamics program are written in Fortran 4 language. This manual contains a description of the overlay structure, data set arrangement, and subroutines of both programs. (Author).
Book Synopsis An Automated Procedure for the Optimization of Practical Aerospace Structures by : Walter J. Dwyer
Download or read book An Automated Procedure for the Optimization of Practical Aerospace Structures written by Walter J. Dwyer and published by . This book was released on 1971 with total page 207 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report documents the development of a new structural optimization algorithm, which is a combination of a modified fully stressed design technique and a redesign procedure based on gradients to deflection constraint surfaces. The algorithm is incorporated into a large finite element program based on the displacement method of structural analysis. Using an IBM 360/75 computer, the program is capable of obtaining near optimum distributions of material for structural idealizations consisting of up to three thousand elements and six thousand degrees of freedom, and subjected to a maximum of twenty loading conditions. Constraints may be placed on the maximum and minimum size of any of the elements, on the stresses in the elements, and on the displacements of the nodal points of the structure. Several examples of structures that were optimized are included to demonstrate the various features of the program, and to compare results with previously obtained solutions. To help make the program useful in the design of major aircraft structures, care has been taken to simplify the input and to present the program output in a form that is meaningful to the aircraft stress engineer. Results of an exploratory investigation into the optimization of dynamically loaded structures are presented, and the conversion of two existing blast-response shell codes into a unified synthesis program is documented. (Author).
Book Synopsis An Automated Procedure for the Optimization of Practical Aerospace Structures by : Walter J. Dwyer
Download or read book An Automated Procedure for the Optimization of Practical Aerospace Structures written by Walter J. Dwyer and published by . This book was released on 1971 with total page 104 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report documents the computer programs described in Volume I of this report entitled 'An Automated Procedure for the Optimization of Practical Aerospace Structures' (AD-726 112). Both the main structural optimization program and the shell dynamics program are written in Fortran 4 language. This manual contains a description of the overlay structure, data set arrangement, and subroutines of both programs.
Book Synopsis An Automated Procedure for the Optimization of Aerospace Structures by : Walter Joseph Dwyer
Download or read book An Automated Procedure for the Optimization of Aerospace Structures written by Walter Joseph Dwyer and published by . This book was released on 1972 with total page 334 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Aerospace Structures Design on Computers by : V. B. Venkayya
Download or read book Aerospace Structures Design on Computers written by V. B. Venkayya and published by . This book was released on 1989 with total page 226 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report, prepared for training, is intended to bring out the elements of structural design optimization on modern computers. The first section gives a cursory description of the requirements and essential disciplines involved in aircraft structural design. The second section is an optimization paper that provides the basis for optimization using large finite element assemblies. The third section provides a summary of design sensitivity analysis which is an essential element of optimization. The two appendices are the descriptions of two training programs for analysis and optimization. Each of these sections has their own references. This is an informal report intended for training and is a collection material entirely from the open literature.
Book Synopsis Force Method Optimization by : R. A. Gellatly
Download or read book Force Method Optimization written by R. A. Gellatly and published by . This book was released on 1980 with total page 102 pages. Available in PDF, EPUB and Kindle. Book excerpt: To overcome problems arising from the rigorous representation of stress constraints in structural optimization, the use of the force method is demonstrated. The force method of finite element analysis is used to transform a stress-constrained redundant structure into a stress and displacement constrained determinate structure for the purposes of optimization. The resulting problem is non-linear, but the use of a linear programming stage is effective in providing a rapid convergence on the optimum design in many cases. Problems which hitherto required many iterations to converge are now solvable in only one or two steps. The rate of constraint numbers versus numbers of variables is investigated analytically using a 22-bar truss problem as an example. The vital key in optimization technology is identified as the identification of active constraints. The incorporation of displacement constraints into the optimization program is also presented. Examples of problems solved by this approach are included. Discussion of difficulties encountered in the development work also provides indicators for future areas of research. (Author).
Book Synopsis Recent Advances in Multidisciplinary Analysis and Optimization by :
Download or read book Recent Advances in Multidisciplinary Analysis and Optimization written by and published by . This book was released on 1989 with total page 1084 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Use of Optimality Criteria Methods for Large Scale Systems by : L. Berke
Download or read book Use of Optimality Criteria Methods for Large Scale Systems written by L. Berke and published by . This book was released on 1974 with total page 60 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Proceedings written by and published by . This book was released on 1971 with total page 1074 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Development of Procedures for Large Scale Automated Minimum Weight Structural Design by : Ronald A. Gellatly
Download or read book Development of Procedures for Large Scale Automated Minimum Weight Structural Design written by Ronald A. Gellatly and published by . This book was released on 1966 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: The report documents the development of new computer programs for the automated minimum weight design of aerospace structures. Two programs are discussed in detail, an intermediate capacity linear merit function program, and a large scale nonlinear program. The intermediate capacity program can be used for the optimization of major structural components of up to approximately 170 degrees of freedom with fixed configuration. The large scale program is capable of handling structures with up to 450 degrees of freedom and includes geometric variables. Detailed descriptions of the preparation of input data are included. Examples are given of the application of the program to a wide variety of structures including major airframe components, indicating the weight savings possible through application of the optimization techniques.
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 1994 with total page 728 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Proceedings of the Third Conference on Matrix Methods in Structural Mechanics by :
Download or read book Proceedings of the Third Conference on Matrix Methods in Structural Mechanics written by and published by . This book was released on 1973 with total page 496 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Structural Optimization by : William R. Spillers
Download or read book Structural Optimization written by William R. Spillers and published by Springer Science & Business Media. This book was released on 2009-06-10 with total page 304 pages. Available in PDF, EPUB and Kindle. Book excerpt: Structural Optimization is intended to supplement the engineer’s box of analysis and design tools making optimization as commonplace as the finite element method in the engineering workplace. It begins with an introduction to structural optimization and the methods of nonlinear programming such as Lagrange multipliers, Kuhn-Tucker conditions, and calculus of variations. It then discusses solution methods for optimization problems such as the classic method of linear programming which leads to the method of sequential linear programming. It then proposes using sequential linear programming together with the incremental equations of structures as a general method for structural optimization. It is furthermore intended to give the engineer an overview of the field of structural optimization.
Download or read book Paper written by and published by . This book was released on 1981 with total page 710 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Computer Oriented Analysis of Shell Structures by : Richard F. Hartung
Download or read book Computer Oriented Analysis of Shell Structures written by Richard F. Hartung and published by . This book was released on 1971 with total page 1316 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Download or read book Applied Mechanics Reviews written by and published by . This book was released on 1971 with total page 804 pages. Available in PDF, EPUB and Kindle. Book excerpt:
