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編修理事会
（2025年1月～ 2025年12月の期間で集計）

The history of optical microscope

Tsutomu ARAKI
Mechanical Engineering Reviews　（2017）　DOI:10.1299/mer.16-00242

年間アクセス数 5233

 

In order to prevent timing belt jumping, which often occurs under high loads, a practical jumping torque prediction formula was studied and the following results were obtained. (1) Jumping occurs when the amount of belt elongation on the tight side span due to the increase in load after the slack side tension becomes zero is equal to the amount of belt elongation due to the belt lifting on the pulley when the lifting reaches the belt tooth height in the whole wrapping area. A jumping torque prediction formula was derived based on this mechanism. The prediction formula includes parameters such as pulley diameter, span length, wrapping angle, belt tooth height, belt extensional rigidity, initial tension, and belt speed. (2) To compensate for the difference between the basic theory of frictional transmission applied in the prediction formula and the actual phenomenon, four correction factors were introduced for the amount of belt elongation caused by the belt lifting, etc., and physical properties of belt teeth. This makes it possible to predict the jumping torque of not only the driven pulley but also the driving pulley, and to expand the application range and improve the prediction accuracy. (3) The four correction factors were obtained by running tests using curvilinear profile S8M type belt, but it was shown that they are also applicable to a trapezoidal profile L type belt. (4) Jumping tests at rest with the driven pulley shaft fixed were conducted, and it was confirmed that the jumping torque of the driving pulley at running was about twice that of the driven pulley, and almost equal to that of the driving and driven pulleys at rest.

 

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

Johan LARSSON, Soshi KAWAI, Julien BODART, Ivan BERMEJO-MORENO
Mechanical Engineering Reviews　（2016）　DOI:10.1299/mer.15-00418

年間アクセス数 4498

The heat generation density of electronic components has increased as they have become smaller and more powerful. Various types of heat pipes have been used as thermal control devices, utilizing heat transport by the gas-liquid phase change of refrigerant. Pulsating Heat Pipe (PHP) has attracted much attention because of its compactness and high heat transport performance. This study is on Low Filling Ratio Pulsating Heat Pipe (LFR-PHP), which can realize more efficient heat transport than conventional PHP. The appearance and experimental outline are the same as those of the conventional PHP, but the amount of working fluid filled is extremely low (10 vol.%), which is considered to cause dry-out in the conventional system. Although the LFR-PHP achieves highly efficient heat transport, the details of the heat transport characteristics, such as the operating principle, have not yet been clarified. In this report, the effects of the installation posture of LFR-PHP (bottom-heat, horizontal-heat, and top-heat posture) on the heat transport performance were investigated. As a result, In the bottom-heat position, the minimum thermal resistance of LFR-PHP was 0.18 K/W, which was about 1/5 times higher than that of conventional PHP and it was confirmed to operate at filling ratios of 3 to 10 vol.%. Experiments with different heat exchange section ratios in the bottom-heat and horizontal positions showed that the heat transport distance was increased and the heat transport performance was improved by adding 60 area.% of adiabatic section area. in the horizontal position, the LFR-PHP was cooled efficiently by placing the heating section in the center of the LFR-PHP, and heat transport performance of it was approximately the same as that of bottom-heat position. In the top-heat posture, it operated when the heating section was 50 area.%, with a minimum thermal resistance of 0.22 K/W.

NO formation/reduction mechanisms of ammonia/air premixed flames at various equivalence ratios and pressures

Akihiro HAYAKAWA, Takashi GOTO, Rentaro MIMOTO, Taku KUDO, Hideaki KOBAYASHI
Mechanical Engineering Journal　（2015）　DOI:10.1299/mej.14-00402

年間アクセス数 3270

Considering in design by analysis, four types of tests, slow-strain-rate tensile (SSRT), fatigue life, fatigue crack-growth (FCG), and elasto-plastic fracture toughness (J_IC) tests, were conducted with low-alloy steels, JIS-SCM435 and JIS-SNCM439, in 115 MPa hydrogen gas and air at room temperature (RT). In addition to above tests at RT, the SSRT tests were also conducted in 115 MPa hydrogen gas and air at 120℃ and in 106 MPa hydrogen gas and 0.1 MPa nitrogen gas at -45℃. The low-alloy steels used in this study had tensile strengths (σ_B) ranging from 824 to 1201 MPa with fine and coarse tempered-martensitic microstructures. In the SSRT and fatigue life tests, the tensile strength and fatigue limit were not degraded in hydrogen gas. The FCG tests revealed that the FCG rate (da/dN) was accelerated in hydrogen gas; however, there existed an upper bound of the FCG acceleration, showing the FCG rate in hydrogen gas was about 30 times larger than that in air, whenσ_B was lower than 900 MPa. The J_ICtests demonstrated that the fracture toughness (K_IC) in air was 207 MPa·m^1/2 atσ_B = 900 MPa, whereas the hydrogen-induced crack-growth threshold (K_I,H) was 57 MPa·m^1/2 atσ_B = 900 MPa. Based on these results, we proposed advanced guidelines on the use and design for SCM435 and SNCM439 on design by analysis in 115 MPa hydrogen gas, which enable to design the storage cylinders used in 70 MPa hydrogen station with lower cost without compromising safety.

4位	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 年間アクセス数 3266
5位	Cable-driven parallel mechanisms: state of the art and perspectives Clément GOSSELIN Mechanical Engineering Reviews　（2014）　DOI:10.1299/mer.2014dsm0004 年間アクセス数 2795
6位	A Review on High-Speed Machining of Titanium Alloys Mustafizur RAHMAN, Zhi-Gang WANG, Yoke-San WONG JSME International Journal Series C Mechanical Systems, Machine Elements and Manufacturing　（2006）　DOI:10.1299/jsmec.49.11 年間アクセス数 2781
7位	Ni-GDC and Ni-YSZ electrodes operated in solid oxide electrolysis and fuel cell modes Anna SCIAZKO, Takaaki SHIMURA, Yosuke KOMATSU, Naoki SHIKAZONO Journal of Thermal Science and Technology　（2021）　DOI:10.1299/jtst.2021jtst0013 年間アクセス数 2277
8位	A Modified Wheeler Model to Improve Predictions of Crack Growth Following a Single Overload Pey-Shiuan SONG, Bor-Chiou SHEU, Li CHANG JSME International Journal Series A Solid Mechanics and Material Engineering　（2001） DOI:10.1299/jsmea.44.117 年間アクセス数1800
9位	Analysis of Processing Mechanism in Stealth Dicing of Ultra Thin Silicon Wafer Etsuji OHMURA, Masayoshi KUMAGAI, Makoto NAKANO, Koji KUNO, Kenshi FUKUMITSU, Hideki MORITA Journal of Advanced Mechanical Design, Systems, and Manufacturing　（2008） DOI:10.1299/jamdsm.2.540 年間アクセス数 1761
10位	The cosα method for X-ray residual stress measurement using two-dimensional detector Keisuke TANAKA Mechanical Engineering Reviews　（2019）　DOI:10.1299/mer.18-00378 年間アクセス数 1745