Preliminary Evaluation of Waveguide Vibration Absorbers
Abstract
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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1984
- Accession Number
- ADA140743
Entities
People
- Eric E. Ungar
- Leonard G. Kurzweil
Organizations
- BBN Technologies