NDLI: Solving modal equations of motion with initial conditions using msc/nastran dmap. part 1: implementing exact mode superposition

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Solving modal equations of motion with initial conditions using msc/nastran dmap. part 1: implementing exact mode superposition

Content Provider	NASA Technical Reports Server (NTRS)
Author	Abdallah, Ayman A. Ibrahim, Omar M. Barnett, Alan R. Manella, Richard T.
Copyright Year	1993
Description	Within the MSC/NASTRAN DMAP (Direct Matrix Abstraction Program) module TRD1, solving physical (coupled) or modal (uncoupled) transient equations of motion is performed using the Newmark-Beta or mode superposition algorithms, respectively. For equations of motion with initial conditions, only the Newmark-Beta integration routine has been available in MSC/NASTRAN solution sequences for solving physical systems and in custom DMAP sequences or alters for solving modal systems. In some cases, one difficulty with using the Newmark-Beta method is that the process of selecting suitable integration time steps for obtaining acceptable results is lengthy. In addition, when very small step sizes are required, a large amount of time can be spent integrating the equations of motion. For certain aerospace applications, a significant time savings can be realized when the equations of motion are solved using an exact integration routine instead of the Newmark-Beta numerical algorithm. In order to solve modal equations of motion with initial conditions and take advantage of efficiencies gained when using uncoupled solution algorithms (like that within TRD1), an exact mode superposition method using MSC/NASTRAN DMAP has been developed and successfully implemented as an enhancement to an existing coupled loads methodology at the NASA Lewis Research Center.
File Size	585403
Page Count	16
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19930014550
Archival Resource Key	ark:/13960/t3421wd6z
Language	English
Publisher Date	1993-05-01
Access Restriction	Open
Subject Keyword	Structural Mechanics Transient Response Algorithms Modal Response Nastran Equations of Motion Matrix Methods Sequencing Aerospace Engineering Loads Forces Ntrs Nasa Technical Reports Server (ntrs) Nasa Technical Reports Server Aerodynamics Aircraft Aerospace Aeronautic Space Science
Content Type	Text
Resource Type	Article

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