Abstract

The complicating effects of an elbow, along with internal and external fluid loading on a thick-walled pipe were experimentally examined. The important vibroacoustic behavior of a test structure consisting of a Schedule 40 pipe with a ninety-degree elbow was measured in ARL/Penn State’s reverberant water tank. To characterize coupling between the vibrating structure and the surrounding acoustic fluid, several transfer functions between structural vibration and acoustic radiation were measured using force hammer impulse excitation of the structure as well excitation by an acoustic source. A reciprocal measurement method was validated and used to quantify the sound power radiated by an acoustic source inside the pipe. Results provide a rigorous characterization of the vibroacoustic behavior a test structure with simple geometry and are suitable for validation of analytical and numerical models.

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