（2022年1月～2022年12月の期間で集計）

論文アクセスランキングは、J-STAGEが毎月作成するアクセス統計データを集計し、作成したランキングで、集計の対象は書誌事項へのアクセスです。書誌事項とはタイトル、著者名、キーワード、アブストラクトなどが記載されている、デジタルオブジェクト識別子（DOI:Digital Object Identifier）が指定するURLになります。

1位

タイミングベルトのジャンピング現象とジャンピングトルク予測

大倉 清, 大﨑 侑, 水本 匠, 西田 周平, 丸山 雄司

日本機械学会論文集　（2022）　DOI:10.1299/transjsme.21-00250

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.

2位

温度と湿度による樹脂材料の強度低下の予測

澤田 祐子, 越前谷 大介

日本機械学会論文集　（2019）　DOI:10.1299/transjsme.18-00505

A large quantity of engineering plastics are used in electric industrial products. It is necessary to estimate the life of the product made of engineering plastics because of its shorter life and lower strength than some of ceramics or metals. Polybutylene terephthalate is one of the hydrolyzed engineering plastics. Their test pieces were submitted to accelerated stress test of elevated temperature and humidity. Their strength was evaluated by three-point bending test. It was found that the strength degradation was related to water vapor pressure, temperature and retention time. It was possible to estimate the time required for strength degradation in service environment.

3位

内燃機関自動車，ハイブリッド自動車，電気自動車，燃料電池自動車における車内空調を考慮した量産車両LCCO₂排出量の比較分析

石崎 啓太, 中野 冠

日本機械学会論文集　（2018）　DOI:10.1299/transjsme.18-00050

This study systematically analyzed life cycle CO₂ (LCCO₂) emissions of a comprehensive set of mass-produced 2,000 cc class sedan-type vehicles, using a hybrid life cycle inventory approach. Gasoline and diesel internal combustion engine vehicles (ICEVs), hybrid electric vehicle (HEV) as well as battery electric vehicle (BEV) and fuel cell vehicle (FCV) were investigated, considering (i) the current BEV market trends, (ii) Japan’s energy mix (the average for 2012–2014), and (iii) the use of the HVAC system. The results show that the annual average increment of CO₂ emissions in use phase by HVAC system in Japan (assumed annual mean temperature of 15°C) was presumed to be evenly 9% regardless of vehicle types, although further detail analysis is required. The CO₂ emissions in use phase of BEV were higher than those of HEV and FCV (applied hydrogen produced by steam reforming of LPG (on-site)) due to thermal power dominant electricity generation mix in Japan in recent years. As a consequence of high CO₂ emissions from power supply and battery production, the LCCO₂ emissions of BEV equipped with 75 kWh battery were higher than those of HEV, FCV (on-site), and conventional ICEV (diesel). By reducing the battery capacity to 40 kWh or less, the LCCO₂ emissions of BEV become lower than those of ICEVs and FCV (on-site), making BEV a competitive alternative. However, it is difficult that BEV mitigates both LCCO₂ emissions and driver’s range anxiety. In conclusion, HEV shows the competitive performance in terms of LCCO₂ emissions with long driving range in Japan.

4位	ヘルツ接触理論の高速収束計算手法 大場 一輝 日本機械学会論文集　（2014）　DOI:10.1299/transjsme.2014cm0105
5位	乱流境界層への気泡注入による摩擦抵抗低減効果：長尺模型船実験と実スケール性能の推定 田中 泰爾, 大石 義彦, 朴 炫珍, 田坂 裕司, 村井 祐一, 川北 千春 日本機械学会論文集　（2022）　DOI:10.1299/transjsme.21-00297
6位	デジタル画像相関法を用いたボルト軸力計測 井上 剛志, 澤田 貴彦, 田中 行平, 倉敷 哲生 日本機械学会論文集　（2022）　DOI:10.1299/transjsme.22-00094
7位	Excelに対応した3重対角行列アルゴリズムを用いた汎用1次元熱伝導解析（平板・円筒・球の陰解法非定常熱伝導の統一解析） 圓山 重直 日本機械学会論文集　（2022）　DOI:10.1299/transjsme.22-00105
8位	ワイヤ干渉駆動型超長尺多関節アームSuper Dragonの開発 遠藤 玄, 髙田 敦, 堀米 篤史 日本機械学会論文集　（2019）　DOI:10.1299/transjsme.19-00075
9位	分子気体潤滑方程式の壁面粗さに対する適用限界について（せん断流れにおける潤滑膜断面方向流れの特性とその影響） 市原 順一 日本機械学会論文集　（2022）　DOI:10.1299/transjsme.21-00326
10位	低速走行時のレール振動を基にした車輪偏摩耗を有する新幹線列車高速走行時の構造物音の推定 末木 健之, 関根 健司 日本機械学会論文集　（2022）　DOI:10.1299/transjsme.22-00130