Experimental verification of damping mechanisms in a composite beamA method of estimating the distributed damping parameters based on the measured modal parameters (frequency and damping ratios) was derived. Three different mathematical models were used to model the damping mechanism of a quasi-isotropic pultruded cantilevered beam. These three models were (1) viscous (air) damping, (2) strain rate damping, and (3) both viscous and strain rate damping. The eigenvalues of the partial differential equation model were found to be uninfluenced by any of the three assumed damping models. Values were obtained for each of the damping models as well as the modulus of elasticity of the beam. It was found that the two-parameter damping model provided the best fit to measured modal data. However, the two-parameter damping model could only reproduce the measured damping ratios to within 85 percent.
Document ID
19900029943
Acquisition Source
Legacy CDMS
Document Type
Conference Paper
Authors
Cudney, Harley H. (State Univ. of New York Buffalo, NY, United States)
Inman, Daniel J. (New York, State University Buffalo, United States)