Accession Number : ADA133736

Title :   Wave Attenuation in Damped Periodic Structures.

Descriptive Note : Interim technical rept.,

Corporate Author : MINNESOTA UNIV MINNEAPOLIS DEPT OF AEROSPACE ENGINEERING AND MECHANICS

Personal Author(s) : Plunkett,Robert ; Roy,Ajit K

PDF Url : ADA133736

Report Date : 12 Jul 1983

Pagination or Media Count : 32

Abstract : It is known that periodic structures will act as filters for bending waves. The equations for an infinite ribbed bar have been published. The objective of this study is to get extensive quantitative results, both analytical and experimental, for a finite number of tuned ribs and to extend the work to plates and possibly shells. In the process, we intend also to investigate the differences between symmetric (two-sided) and asymmetric (one-sided) cantilever ribs. This first technical report gives analytical and experimental results for the uniform bar (unribbed) and for the same bar with fifteen pairs of tuned cantilevers which approximates the infinite ribbed bar.

Descriptors :   *Elastic waves, *Acoustic attenuation, *Beams(Structural), *Damping, Structural analysis, Structural properties, Wave propagation, Cantilever beams, Plates, Shells(Structural forms), Traveling waves, Equations, Quantitative analysis, Test methods, Mathematical analysis

Subject Categories : Structural Engineering and Building Technology
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE