Accession Number : AD0430384


Title :   MECHANISMS AND MEASUREMENT OF STRUCTURAL DAMPING,


Corporate Author : BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA


Personal Author(s) : Kerwin, Edward M , Jr


Report Date : Oct 1963


Pagination or Media Count : 1


Abstract : A brief review of some common mechanisms of structural damping in beams and plates is presented. The mechanisms reviewed involve dissipation in viscoelastic materials, specifically in the so-called free and constrained viscoelastic layers, and the thickness-resonant viscoelastic layer. In each case, the parameters governing damping effectiveness are defined, and the dependence of damping on these parameters is discussed. In the second part of the paper, some of the problems encountered in determining the damping of complex systems are discussed. Such problems are found where the damping is moderate or high, or where the system is extensive or involves coupled subsystems. Important considerations here are the distribution of vibrating energy throughout the system, the degree of coupling among subsystems, the type of vibratory excitation, and variations in modal damping. Some damping measurements in complex structures are discussed. Preliminary guides for performing damping measurements in complex structures are discussed. Preliminary guides for performing damping measurements in complex systems are given. (Author)


Descriptors :   *BEAMS(STRUCTURAL) , *METAL PLATES , DAMPING , DAMPING , STRUCTURAL COMPONENTS , RESONANCE , VISCOELASTICITY , VIBRATION


Distribution Statement : APPROVED FOR PUBLIC RELEASE