日本機械学会サイト

目次に戻る

2021/1 Vol.124

工部大学校の「機械学」教育機器(機械遺産第 100号)
機構模型 ねじ

年代未詳/真鍮、鉄、木製台座/ H270, Dia.130(mm)/東京大学総合研究博物館所蔵
ねじは基本的な機構の一つ。機構模型は近代化の進められた機械学教育に用いられた。本模型の年代は未詳であるが、東京大学総合研究博物館には工部大学校を示すプレート付きのものを含め、近代的な機械学教育のために明治期以降に導入された機構模型が現存する。
上野則宏撮影/東京大学総合研究博物館写真提供/インターメディアテク展示・収蔵

バックナンバー

論文アクセスランキング

日本機械学会学術誌(英文) 年間アクセス数トップ10

(2019年7月~2020年6月の期間で集計) *順位の変動は2019年4月~2020年3月の期間との比較


Large eddy simulation with modeled wall-stress: recent progress and future directions

Johan LARSSON, Soshi KAWAI, Julien BODART, Ivan BERMEJO-MORENO

Mechanical Engineering Reviews(2016) DOI:10.1299/mer.15-00418
The paper provides a brief introduction to the near-wall problem of LES and how it can be solved through modeling of the near-wall turbulence. The distinctions and key differences between different approaches are emphasized, both in terms of fidelity (LES, wall-modeled LES, and DES) and in terms of different wall-modeled LES approaches (hybrid LES/RANS and wall-stress-models). The focus is on approaches that model the wall-stress directly, i.e., methods for which the LES equations are formally solved all the way down to the wall. Progress over the last decade is reviewed, and the most important and promising directions for future research are discussed.

Three-dimensional deformation mode of multicellular epithelial tube under tension and compression tests

Satoru OKUDA, Katsuyuki UNOKI, Mototsugu EIRAKU, Ken-ichi TSUBOTA

Journal of Biomechanical Science and Engineering (2018) DOI:10.1299/jbse.17-00507
Deformability of epithelial tissues plays a crucial role in embryogenesis, homeostasis, wound healing, and disease. The deformability is determined by the mechanical balance between active force generation and passive response of cells. However, little is known about how multiple cells in epithelial tissues passively respond to external forces. Using a 3D vertex model, we performed computational simulations of longitudinal tension and compression tests of an epithelial tube. Under tension, the tube extended with necking as exhibiting cell rearrangements that play a role in reducing local stiffness of the tube. On the other hand, under compression, the tube buckled with kinking without cell rearrangements. The cell rearrangements occurred when apical and basal cell surfaces stored elastic deformation energies. These results illustrate the variance of deformation modes of epithelial tissues in the single cell level as well as the importance of cell rearrangements in regulating epithelial deformability.

Relationship between solidification time and porosity with directed energy deposition of Inconel 718

Tatsuhiko KURIYA, Ryo KOIKE, Takanori MORI, Yasuhiro KAKINUMA

Journal of Advanced Mechanical Design, Systems, and Manufacturing (2018) DOI:10.1299/jamdsm.2018jamdsm0104
Directed Energy Deposition (DED) of metal materials has been widely studied with Inconel 718 using in aerospace industry. Void generation in a deposited part causes deterioration of the mechanical strength. Hence, void should be avoided in the DED process. In this study, a mechanism of void generation was investigated through the dynamic observation by high-speed camera, the thermal observation and the evaluation of the porosity. The experimental result shows that solidification time has an influence on the void generation.

4位

[NEW]

A review of metal additive manufacturing technologies: Mechanism of defects formation and simulation of melting and solidification phenomena in laser powder bed fusion process

Hideki KYOGOKU, Toshi-Taka IKESHOJI
Mechanical Engineering Reviews (2020) DOI:10.1299/mer.19-00182

5位

[NEW]

Scale model experiments for evaluation of liquid water transport in the gas diffusion layer of PEFCs

Yutaka TABE, Satoshi SAKAIDA, Takemi CHIKAHISA
Journal of Thermal Science and Technology (2018) DOI:10.1299/jtst.2018jtst0025

6位

[↓]

Development of flow-accelerated corrosion prediction method (2) Modeling and validation with thinning rate profile data

Kimitoshi YONEDA, Kazutoshi FUJIWARA, Ryo MORITA, Fumio INADA
Mechanical Engineering Journal (2018) DOI:10.1299/mej.17-00415

7位

[↑]

Elastic buckling of cylindrical shell under pressure load evaluated on surface

Takeki YAMAMOTO, Takahiro YAMADA
Mechanical Engineering Journal (2019) DOI:10.1299/mej.19-00113

8位

[NEW]

Aerodynamic drag change of simplified automobile models influenced by a passing vehicle

Keigo SHIMIZU, Takuji NAKASHIMA, Takenori HIRAOKA, Yusuke NAKAMURA, Takahide NOUZAWA, Yasuaki DOI
Mechanical Engineering Journal (2020) DOI:10.1299/mej.19-00366

9位

[↓]

Track geometry estimation of a conventional railway from car-body acceleration measurement

Mai ODASHIMA, Shohei AZAMI, Yasukumi NAGANUMA, Hirotaka MORI, Hitoshi TSUNASHIMA
Mechanical Engineering Journal (2017) DOI:10.1299/mej.16-00498

10位

[NEW]

Numerical simulation of droplet behavior on an inclined plate using the Moving Particle Semi-implicit method

Tsuyoshi HATTORI, Seiichi KOSHIZUKA
Mechanical Engineering Journal (2019) DOI:10.1299/mej.19-00204

キーワード: