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Journal of Technology and Social Science (JTSS, J. Tech. Soc. Sci.)

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ISSN 2432-5686



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Home > Archives > Vol.6, No.3

Vol.6, No.3






Numerical Analysis of Sound Absorbing Properties for Multilayered Structures Including Perforated Plates, Plates with Slits, Porous Materials and Air Layers

Takao Yamaguchi, Katsunori Tsukui, Ryogo Saito, and Chihiro Kamio

Journal of Technology and Social Science, Vol.6, No.3, pp.1-10, 2022.

Abstract: In this paper, we proposed a multi-layered sound absorbing structure having a hard surface made of resin from middle frequency to high frequency range. This proposed structure includes perforated plates, a plate with slits, a porous material and air spaces. We investigate many kinds of multi-layered sound absorbing structures by experiment and numerical simulation using finite element method in consideration of damping in acoustic field. Further, we investigated and verified a computation method to obtain sound absorbing properties for structures including perforated plate and plates with slits. In this calculation we consider acoustic resistance for internal air in the pores and slits using increments in complex effective density.

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Proof of puncture resistance with non-penetration of medical 23G needles against protective materials for use in gloves - Verification by Pressure Sensors and Accelerometers

Seiji Tada, Masaaki Matsubara, Ryosuke Suzuki, Yu Goto, and Kenta Morishita

Journal of Technology and Social Science, Vol.6, No.3, pp.11-19, 2022.

Abstract: Medical needles, mainly 23G, have become an indispensable instrument in clinical medicine. The accelerometer enables the user to check the non-penetration to the protective material of the hand, which is one of the most exposed areas of personal protection. With accidental motion energy of 0.0557 kg m2/s2 and a tip penetration of 90, the microscopic atmosphere of the non-penetrating acceleration was verified.

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