NDLI: Improved equivalent linearization implementations using nonlinear stiffness evaluation

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Improved equivalent linearization implementations using nonlinear stiffness evaluation

Content Provider	NASA Technical Reports Server (NTRS)
Author	Rizzi, Stephen A. Muravyov, Alexander A.
Copyright Year	2001
Description	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.
File Size	2423973
Page Count	66
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_20010037617
Archival Resource Key	ark:/13960/t7pp4201n
Language	English
Publisher Date	2001-03-01
Access Restriction	Open
Subject Keyword	Structural Mechanics Rectangular Plates Finite Element Method Stiffness Applications Programs Computers Nastran Random Vibration Linearization Fortran Structural Analysis Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Engineering Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Technical Report

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