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Improved Equivalent Linearization Implementations Using Nonlinear Stiffness Evaluation
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Book Synopsis Improved Equivalent Linearization Implementations Using Nonlinear Stiffness Evaluation by : Stephen A. Rizzi
Download or read book Improved Equivalent Linearization Implementations Using Nonlinear Stiffness Evaluation written by Stephen A. Rizzi and published by DIANE Publishing. This book was released on 2001 with total page 66 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report documents two new implementations of equivalent linearization for solving geometrically nonlinear random vibration problems of complicated structures. The implementations are given the acronym ELSTEP, for "Equivalent Linearization using a Stiffness Evaluation Procedure." Both implementations of ELSTEP are fundamentally the same in that they use a novel nonlinear stiffness evaluation procedure to numerically compute otherwise inaccessible nonlinear stiffness terms from commercial finite element programs. The commercial finite element program MSC/NASTRAN (NASTRAN) was chosen as the core of ELSTEP. The FORTRAN implementation calculates the nonlinear stiffness terms and performs the equivalent linearization analysis outside of NASTRAN.
Author :National Aeronautics and Space Adm Nasa Publisher :Independently Published ISBN 13 :9781723851346 Total Pages :68 pages Book Rating :4.8/5 (513 download)
Book Synopsis Improved Equivalent Linearization Implementations Using Nonlinear Stiffness Evaluation by : National Aeronautics and Space Adm Nasa
Download or read book Improved Equivalent Linearization Implementations Using Nonlinear Stiffness Evaluation written by National Aeronautics and Space Adm Nasa and published by Independently Published. This book was released on 2018-09-20 with total page 68 pages. Available in PDF, EPUB and Kindle. Book excerpt: This report documents two new implementations of equivalent linearization for solving geometrically nonlinear random vibration problems of complicated structures. The implementations are given the acronym ELSTEP, for "Equivalent Linearization using a STiffness Evaluation Procedure." Both implementations of ELSTEP are fundamentally the same in that they use a novel nonlinear stiffness evaluation procedure to numerically compute otherwise inaccessible nonlinear stiffness terms from commercial finite element programs. The commercial finite element program MSC/NASTRAN (NASTRAN) was chosen as the core of ELSTEP. The FORTRAN implementation calculates the nonlinear stiffness terms and performs the equivalent linearization analysis outside of NASTRAN. The Direct Matrix Abstraction Program (DMAP) implementation performs these operations within NASTRAN. Both provide nearly identical results. Within each implementation, two error minimization approaches for the equivalent linearization procedure are available - force and strain energy error minimization. Sample results for a simply supported rectangular plate are included to illustrate the analysis procedure.Rizzi, Stephen A. and Muravyov, Alexander A.Langley Research CenterLINEARIZATION; RANDOM VIBRATION; APPLICATIONS PROGRAMS (COMPUTERS); STIFFNESS; STRUCTURAL ANALYSIS; FORTRAN; NASTRAN; RECTANGULAR PLATES; FINITE ELEMENT METHOD
Book Synopsis IMPROVED EQUIVALENT LINEARIZATION IMPLEMENTATIONS USING NONLINEAR STIFFNESS EVALUATION... NASA/TM-2001-210838... JUN. 20, 2001 by :
Download or read book IMPROVED EQUIVALENT LINEARIZATION IMPLEMENTATIONS USING NONLINEAR STIFFNESS EVALUATION... NASA/TM-2001-210838... JUN. 20, 2001 written by and published by . This book was released on 2002 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Book Synopsis Equivalent Linearization Analysis of Geometrically Nonlinear Random Vibrations Using Commercial Finite Element Codes by : Stephen Anthony Rizzi
Download or read book Equivalent Linearization Analysis of Geometrically Nonlinear Random Vibrations Using Commercial Finite Element Codes written by Stephen Anthony Rizzi and published by DIANE Publishing. This book was released on 2002 with total page 39 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :National Aeronautics and Space Administration (NASA) Publisher :Createspace Independent Publishing Platform ISBN 13 :9781720508106 Total Pages :40 pages Book Rating :4.5/5 (81 download)
Book Synopsis Equivalent Linearization Analysis of Geometrically Nonlinear Random Vibrations Using Commercial Finite Element Codes by : National Aeronautics and Space Administration (NASA)
Download or read book Equivalent Linearization Analysis of Geometrically Nonlinear Random Vibrations Using Commercial Finite Element Codes written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-08-20 with total page 40 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two new equivalent linearization implementations for geometrically nonlinear random vibrations are presented. Both implementations are based upon a novel approach for evaluating the nonlinear stiffness within commercial finite element codes and are suitable for use with any finite element code having geometrically nonlinear static analysis capabilities. The formulation includes a traditional force-error minimization approach and a relatively new version of a potential energy-error minimization approach, which has been generalized for multiple degree-of-freedom systems. Results for a simply supported plate under random acoustic excitation are presented and comparisons of the displacement root-mean-square values and power spectral densities are made with results from a nonlinear time domain numerical simulation.Rizzi, Stephen A. and Muravyov, Alexander A.Langley Research CenterLINEARIZATION; ACOUSTIC EXCITATION; FINITE ELEMENT METHOD; RANDOM VIBRATION; OPTIMIZATION; MATHEMATICAL MODELS; POTENTIAL ENERGY; COMPUTERIZED SIMULATION; LOAD DISTRIBUTION (FORCES); SPECTRAL BANDS; ROOT-MEAN-SQUARE ERRORS; ACOUSTIC FATIGUE; DEGREES OF FREEDOM
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Book Synopsis NASA Langley Scientific and Technical Information Output-2001 by :
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Book Synopsis The Bio-inspired X-Structure/Mechanism Approach for Exploring Nonlinear Benefits in Engineering by : Xingjian Jing
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