• Journal of the Korean Institute of Gas
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• v.18 no.1
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• pp.41-45
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• 2014

This paper presents an analytical study on the displacement behavior safety of cylindrical hollow rollers. Using the finite element method, the hollow roller with Y-shaped column structures between three tubes has been developed to analyze the displacement behavior safety. For the same dimension and weight of two hollow roller models, the displacement behavior safety of a typical hollow roller is lower 4~6.6% than that of the newly designed hollow roller with Y-shaped column structures between three tubes. Thus, this paper recommends Y-shaped hollow roller for increasing the roller strength safety and decreasing a total roller weight, which may save a consuming electrical energy.

• 대한공업교육학회지
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• v.36 no.1
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• pp.115-130
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• 2011

When the hollow cylinder structure moves in underwater with high speed structural can be propagated from the end of the structure to the front side. This noise can reduce the sensitivity of the conformal array which installed in the surface of the cylinder. To reduce this noise propagation it is suggested to install two self-reduction rings at the surrounding of the cylinder which is 500mm in diameter and 840mm in length. The places of the two noise reduction rings are 120mm and 240mm point from the end of the structure. Two noise reduction rings reduced 10.1 % of maximum stress. When outside noise frequency applied to the structure from the 4kZ to 6kHz, 20dB noise reduction was calculated using 6 order polynomial equation. When outside noise frequency also applied to the structure with 200Hz, 500Hz, 900Hz, maximum sound pressure level point moved to the end of the structure. Most conformal sensors are fabricated at the front side of the structure. Based on the simulation results proposed two rings can be reduced noise propagation from the tail of the structure effectively.