NDLI: An evaluation of higher-order model methods for calculating transient structural response

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An evaluation of higher-order model methods for calculating transient structural response

Content Provider	NASA Technical Reports Server (NTRS)
Author	Camarda, Charles J. Haftka, Raphael T. Riley, Michael F.
Copyright Year	1987
Description	A higher-order modal method proposed by Leung for transient structural analysis entitled the force-derivative method is evaluated. This method repeatedly integrates by parts with respect to time the convolution-integral form of the structural response to produce successively better approximations to the contribution of the higher modes which are neglected in the modal summation. Comparisons are made of the force-derivative, the mode-displacement, and the mode-acceleration methods for several numerical example problems for various times, levels of damping, and forcing functions. The example problems include a tip-loaded cantilevered beam and a simply-supported multispan beam. The force-derivative method is shown to converge to an accurate solution in fewer modes than either the mode-displacement or the mode-acceleration methods. In addition, for problems in which there are a large number of closely-spaced frequencies whose mode shapes have a negligible contribution to the response, the force-derivative method is very effective in representing the effect of the important, but otherwise neglected, higher modes.
File Size	1266811
Page Count	38
File Format	PDF
Alternate Webpage(s)	http://archive.org/details/NASA_NTRS_Archive_19870012838
Archival Resource Key	ark:/13960/t2v45mj00
Language	English
Publisher Date	1987-04-01
Access Restriction	Open
Subject Keyword	Structural Mechanics Dynamic Structural Analysis Stiffness Matrix Transient Response Degrees of Freedom Approximation Vibration Beams Supports Equations of Motion Loads Forces 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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