Characterization of folded beam waveguide absorbers for damping of flexural vibrations in a thick plate

C. M. Pray, S. A. Hambric, T. E. McDevitt, C. B. Burroughs

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Effective techniques for providing low frequency damping of thick-walled vibrating structures are limited. Waveguide absorbers have been introduced as a technique to provide low frequency damping and have been shown to be effective. However, only limited research has been done to characterize their behavior. Folded beam waveguide absorbers simulate infinite beams that carry flexural waves away from a structure when sufficient damping is applied to the folded beam to minimize reflection of the waves back into the vibrating structure. In this study, damped folded beam waveguide absorbers are characterized by measuring the increase in damping produced by attaching the absorbers to a large thick plate in air with free boundary conditions. The added damping is determined by performing modal analyses of the structure. The measured values are compared with values predicted using current methods. When attached at strategic locations on the plate, the damping contribution of the absorbers increases. The measured increases in damping loss factors are generally higher than those predicted using methods that consider only translational motion, indicating that additional damping is produced by rotational motion.

Original languageEnglish (US)
Pages (from-to)185-192
Number of pages8
JournalNoise Control Engineering Journal
Issue number6
StatePublished - 2000

All Science Journal Classification (ASJC) codes

  • Building and Construction
  • Automotive Engineering
  • Aerospace Engineering
  • Acoustics and Ultrasonics
  • Mechanical Engineering
  • Public Health, Environmental and Occupational Health
  • Industrial and Manufacturing Engineering


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