Výsledky vyhledávání - "Sunao Tomita"

Akademický článek

Damping properties and optical observation of particles behavior in particle dampers with particle diameters of sub-mm or less (The case of gravity direction vibration)

Autor: Takashi MASUTANI, Sunao TOMITA, Haruki SATO, Sachito NAKANO

Publikováno v: Nihon Kikai Gakkai ronbunshu, Vol 90, Iss 935, Pp 23-00290-23-00290 (2024)

Particle dampers (PD) can be embedded in structures fabricated via selective laser melting (SLM) because the raw powder (particle diameter : several tens of micrometers) remains in closed spaces during SLM. However, most PD studies have focused on co

Externí odkaz: https://doaj.org/article/10f8564e8dc24f03902842fdee9f3777

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Akademický článek

Transition of deformation modes from bending to auxetic compression in origami-based metamaterials for head protection from impact

Autor: Sunao Tomita, Kento Shimanuki, Shin Oyama, Hidekazu Nishigaki, Toshiaki Nakagawa, Masakazu Tsutsui, Youhei Emura, Masahiko Chino, Hirokazu Tanaka, Yoshinobu Itou, Kazuhiko Umemoto

Publikováno v: Scientific Reports, Vol 13, Iss 1, Pp 1-12 (2023)

Abstract For the protection of the human head by energy absorption structures, a soft mechanical response upon contact with the head is required to mitigate the effect of impact, while a hard mechanical response for highly efficient energy absorption

Externí odkaz: https://doaj.org/article/a9815f13d54149b8abd1ebc8e34e2f3a

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Akademický článek

Operational modal analysis of under-determined system based on Bayesian CP decomposition (Translated)

Autor: Sunao TOMITA, Tomohiko JIMBO

Publikováno v: Mechanical Engineering Journal, Vol 11, Iss 1, Pp 23-00513-23-00513 (2024)

Modal parameters such as natural frequencies, modal shapes, and the damping ratio are useful to understand structural dynamics of mechanical systems. Modal parameters need to be estimated under operational conditions for use in structural health moni

Externí odkaz: https://doaj.org/article/77cb4b0fde2d4134888c2c9d107aeeb8

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Akademický článek

Origami-inspired metamaterials with switchable energy absorption based on bifurcated motions of a Tachi-Miura polyhedron

Autor: Sunao Tomita, Kento Shimanuki, Hidekazu Nishigaki, Shin Oyama, Takashi Sasagawa, Daisuke Murai, Kazuhiko Umemoto

Publikováno v: Materials & Design, Vol 225, Iss , Pp 111497- (2023)

This study involved the design of energy absorbing structures that have precisely tailored performances based on the differences between the bifurcated motions of a Tachi-Miura polyhedron (TMP) with flat-foldable and load-bearing motions. The tailore

Externí odkaz: https://doaj.org/article/6a35732dd2354dadb69c577f298ca2e8

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Akademický článek

Elastic metamaterial composite made of molded pulp and steel for suppression of low-frequency vibration in thin-plate structures

Autor: Sunao Tomita, Sachito Nakano, Makoto Segi, Takuya Nishimura

Publikováno v: Materials & Design, Vol 223, Iss , Pp 111200- (2022)

This study proposes EMMs made of molded pulp and steel composite structures; molded pulp can be used to manufacture periodic shapes with low cost and environmental burden, which can help in the application of EMMs to steel structures that are widely

Externí odkaz: https://doaj.org/article/c0cd238c31984456b50c878257320754

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Akademický článek

Reduction of ear-position sound pressure at low speed in electric vehicles by pulp mold

Autor: Sachito NAKANO, Sunao TOMITA, Makoto SEGI, Takuya NISHIMURA

Publikováno v: Nihon Kikai Gakkai ronbunshu, Vol 88, Iss 911, Pp 21-00395-21-00395 (2022)

Electric vehicles (EVs) generate different cabin noise from internal combustion engine vehicles (ICE) during low-speed driving. In order to identify the cause of the interior noise of EVs at low-speed (30km/h) and to reduce the noise, a Helmholtz res

Externí odkaz: https://doaj.org/article/fd79b5ca639f43b69f659cecf0e46fbc

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Akademický článek

Operational modal analysis of under-determined system based on Bayesian CP decomposition

Autor: Sunao TOMITA, Tomohiko JIMBO

Publikováno v: Nihon Kikai Gakkai ronbunshu, Vol 87, Iss 899, Pp 21-00134-21-00134 (2021)

Modal properties such as natural frequencies, modal shapes and damping ratio are useful to understand structural dynamics of mechanical systems. To use the modal properties for structural health monitoring, they need to be estimated under operational

Externí odkaz: https://doaj.org/article/0665bb101e4a4895b861b3d1b3cd83ab

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Akademický článek

Manufacture of multi-mass dynamic vibration absorber using particle dampers by selective laser melting and evaluation of vibration damping performance

Autor: Takashi MASUTANI, Sachito NAKANO, Sunao TOMITA, Masashi HARA, Haruki SATO

Publikováno v: Nihon Kikai Gakkai ronbunshu, Vol 87, Iss 895, Pp 20-00404-20-00404 (2021)

Selective laser melting (SLM) has been used to fabricate lightweight and complicated structures. Lightweight structures tend to suffer from noise and vibration problems. Hence, to overcome these problems, dynamic vibration absorber (DVA) are embedded

Externí odkaz: https://doaj.org/article/ebab8fcc5bc548a598f3fa85f1ba3c96

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Akademický článek

Nodal position control of bending mode of three- dimensional beam structures based on visualization of eigenmode formation

Autor: Sunao TOMITA, Sachito NAKANO, Hideki SUGIURA, Yuichi MATSUMURA

Publikováno v: Nihon Kikai Gakkai ronbunshu, Vol 84, Iss 864, Pp 18-00027-18-00027 (2018)

In a conceptual design phase of noise and vibration performance, CAE (Computer Aided Engineering) is frequently introduced to design appropriate properties of individual members. One of the most commonly used computational methods for conceptual desi

Externí odkaz: https://doaj.org/article/251f0315ad294d87a3b3ea88aebf4d52

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