Extended Damping Models for Vibration Data Analysis,
MARYLAND UNIV COLLEGE PARK CENTER FOR ROTORCRAFT EDUCATION AND RESEARCH
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A simple 3 degree of freedom spring-mass-damper systems has been used to investigate the response of structural systems when the damping mechanisms are more general than viscous or hysteretic damping. A formulation of the modal series expression for the mobilities for such generally damped structures was also presented. This formulation allows the modelling of general damping behavior by means of a frequency dependent function, the form of which is indicative of the velocity power laws prevailing in the damping mechanism. A numerical simulation of mobility testing of this simple structural model revealed trends in the mobility functions which are similar to those reported in the testing practice of damped complicated structures such as helicopters and the like.