Space structure vibration modes: How many exist? Which ones are important?
- 1 February 1987
- journal article
- Published by Institute of Electrical and Electronics Engineers (IEEE) in IEEE Control Systems Magazine
- Vol. 7 (1) , 22-28
- https://doi.org/10.1109/mcs.1987.1105241
Abstract
This paper attempts to shed some light on the two issues raised in the title: How many vibration modes does a real structure have? and Which of these modes are important? The author argues that the "absurd subspace" (all but the first billion modes) is not a strength of continuum modeling, but, in fact, a weakness. Partial differential equations are not real structures, only mathematical models. This paper also contends that the partial differential equation model and the finite-element model are, in fact, the same model, the latter being a numerical method for dealing with the former. Modes should be selected on dynamical grounds other than frequency alone.Keywords
This publication has 4 references indexed in Scilit:
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