Filtering Effects of Periodic Structure in Water Hammer

Minoru Nagai; Kazuaki Inaba; Kosuke Takahashi; Kikuo Kishimoto

doi:10.4028/www.scientific.net/AMM.566.50

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HomeApplied Mechanics and MaterialsApplied Mechanics and Materials Vol. 566Filtering Effects of Periodic Structure in Water...

Filtering Effects of Periodic Structure in Water Hammer

Abstract:

In this study, we conducted water hammer experiments in the tube which was periodically supported by various numbers of clamps, named periodic structure, initiated by a projectile impact. The parts of the polycarbonate (PC) tube supported by 1-7 steel clamps make the tube stiffer and heavier than the original PC tube and are expected to cause a filtering effect of the frontal frequency components in the water hammer. According to our experimental observations, we confirmed that higher frequency components more than 1 kHz in the wave front were attenuated and the peak strains in circumferential direction of the tube were decreased 20% from the original PC tube. Moreover, we conducted numerical simulations of the water hammer wave similar to the experimental setup. Numerical results also revealed that frontal peak is attenuated 22% through periodic structure.

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Periodical:

Applied Mechanics and Materials (Volume 566)

Pages:

50-55

DOI:

https://doi.org/10.4028/www.scientific.net/AMM.566.50

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Online since:

June 2014

Authors:

Minoru Nagai*, Kazuaki Inaba, Kosuke Takahashi, Kikuo Kishimoto

Keywords:

Fluid Structure Interaction (FSI), Impact Response, Periodic Structure

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