Methods for Determining Modal Parameters and Mass, Stiffness and Damping Matrices.
Interim rept. Apr 77-Mar 78,
AIR FORCE FLIGHT DYNAMICS LAB WRIGHT-PATTERSON AFB OHIO
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Methods for determining modal parameters and mass, damping and stiffness matrices from vibration tests are described mathematically. The emphasis is on methods which, at least in principle, are capable of determining the desired quantities from excitations at a single point. A method which determines the modal parameters and the mass, damping and stiffness matrices from the steady state response to sinusoidal excitations is proposed. A computer program of this method and the results of two numerical experiments are given. The first experiment is for the case of simple characteristic values. In the second experiment, one characteristic value is of multiplicity two. The other methods examined usually determine the desired quantities from the transient response. The mathematical back-ground for all the methods is given.
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