DTIC ADA140743 pdf

DTIC ADA140743

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The loss factor contribution provided to a vibrating structure by an attached energy-absorbing system is analyzed in terms of the mechanical impedances of the structure and attached system. The driving-point impedance of an exponentially tapered semi-infinite beam is derived and is used to determine the parameters that govern the energy-absorption characteristics of flexural waveguide absorbers. Impedances measured on several preliminary candidate absorber configurations are reported, together with the loss factor contributions they provided for an experimental plate. Although these configurations were found not to exhibit the desired waveguide behavior, their measured loss factor contributions were found to be in good agreement with those predicted from their measured impedances. It is concluded that flexural waveguide absorbers indeed have the potential for providing significant damping, but in order to achieve this effect, they must be impedance-matched to the structure that is to be damped, and absorber configurations need to be developed that exhibit the desired waveguide behavior in the frequency range of concern

• Creator/s: Defense Technical Information Center
• Date: 1/1/1984
• Year: 1984
• Book Topics/Themes: DTIC Archive, Ungar, Eric E, BOLT BERANEK AND NEWMAN INC CAMBRIDGE MA, *VIBRATION ISOLATORS, BEAMS(STRUCTURAL), DAMPING, DYNAMIC RESPONSE, ENERGY ABSORBERS, ENERGY TRANSFER, FLAT PLATE MODELS, RESONANCE ABSORPTION, STRUCTURAL COMPONENTS

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