Structural-acoustic measurements of pipes with ninety-degree elbows, under water loading

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

The structural effects of an elbow, along with the fluid-loading effects of internal and external water on a thin and thick-walled pipe were experimentally examined. The important vibroacoustic behavior of test structures consisting of thin-walled (Schedule 10) and thick-walled (Schedule 40) steel pipe with ninety-degree elbows was measured in ARL/Penn State's reverberant water tank. To characterize coupling between the vibrating structures and the surrounding acoustic fluid, several transfer functions between structural vibration and acoustic sound radiation were measured using force hammer impulse excitation. The sound power transfer functions show that the pipes behave generally like dipole sound sources when excited with structural transverse drives, and amplify sound at the cut-on frequencies of shell wall lobar modes. The radiation efficiencies of the thick-walled pipe are higher than those of the thinwalled pipe above the cut-on frequencies of lobar modes, and the radiation efficiencies of both elbowed pipes are lower than those given by simple statistical estimates for beams and shells.

Original languageEnglish (US)
Title of host publication19th National Conference on Noise Control Engineering 2005, Noise-Con 05
Pages644-652
Number of pages9
StatePublished - Dec 1 2005
Event19th National Conference on Noise Control Engineering 2005, Noise-Con 2005 - Minneapolis, MN, United States
Duration: Oct 15 2005Oct 17 2005

Publication series

Name19th National Conference on Noise Control Engineering 2005, Noise-Con 05
Volume1

Other

Other19th National Conference on Noise Control Engineering 2005, Noise-Con 2005
CountryUnited States
CityMinneapolis, MN
Period10/15/0510/17/05

All Science Journal Classification (ASJC) codes

  • Acoustics and Ultrasonics

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  • Cite this

    Doty, B., Hambric, S., Conlon, S., & Fahnline, J. (2005). Structural-acoustic measurements of pipes with ninety-degree elbows, under water loading. In 19th National Conference on Noise Control Engineering 2005, Noise-Con 05 (pp. 644-652). (19th National Conference on Noise Control Engineering 2005, Noise-Con 05; Vol. 1).