Power Flow and Mechanical Intensity Calculations in Structural Finite Element Analysis

[+] Author and Article Information
S. A. Hambric

Applied Mathematics Division (184), David Taylor Research Center, Bethesda, MD 20084-5000

J. Vib. Acoust 112(4), 542-549 (Oct 01, 1990) (8 pages) doi:10.1115/1.2930140 History: Received April 01, 1989; Online June 17, 2008


The identification of power flow paths in dynamically loaded structures is an important, but currently unavailable, capability for the finite element analyst. For this reason, methods for calculating power flows and mechanical intensities in finite element models are developed here. Formulations for calculating input and output powers, power flows, and mechanical intensities for beam and plate/shell element types are derived. NASTRAN is used to calculate the required velocity, force, and stress results of an analysis, which a post-processor then uses to calculate power flow quantities. Test models include a simple truss and a beam-stiffened cantilever plate. Both test cases showed reasonable power flow fields over low to medium frequencies.

Copyright © 1990 by The American Society of Mechanical Engineers
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