Experimental Studies of Circular Viscoelastic Waveguide Absorbers for Passive Structural Damping
Abstract
The U.S. Navy continues to investigate and develop better methods for ship noise and vibration reduction. One such method is the introduction of waveguide absorbers. This research is a continuation with the use of viscoelastic waveguide absorbers as a means of reducing the vibrational energy developed within a plate like structure, such as a ship's hull between frames and longitudinals. The effects of temperature and size of circular viscoelastic waveguide absorbers, on the driving point impedance were studied and the test results were compared with a previously developed computer prediction model with very favorable agreement. A study for the development of the scheme for the selection of waveguide absorbers and for the decision of the attachment locations for the maximum vibration reduction based on the waveguide absorber loss factor equation was also performed. One, Two, and three waveguide absorbers were attached to a vibrating plate velocity, to confirm the use of the loss factor equation. Experimental results showed significant reduction of vibration at resonant frequencies. Theses.
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1989
- Accession Number
- ADA225409
Entities
People
- Stephen J. Watson
Organizations
- Naval Postgraduate School