start-ver=1.4 cd-journal=joma no-vol=91 cd-vols= no-issue=946 article-no= start-page=24-00128 end-page= dt-received= dt-revised= dt-accepted= dt-pub-year=2025 dt-pub=2025 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Development of a guideline proposal system for correcting cutting conditions based on the overhang length of ball end-mills kn-title=ボールエンドミルの突き出し長さに応じた切削条件補正システムの開発 en-subtitle= kn-subtitle= en-abstract= kn-abstract=In the field of die and mold machining, determining appropriate cutting conditions is crucial. Factors such as tool geometry, machining path, work material characteristics, machining efficiency, and finishing accuracy must be taken into consideration. However, the current method of determining cutting conditions relies heavily on the intuition and experience of skilled engineers, and there is a need for a system to replace such knowledge. One of the critical factors affecting machining accuracy and efficiency is the tool overhang length, which is directly related to tool geometry. Unfortunately, there is no clear guideline for its determination. In a previous study, researchers developed a system to quickly derive cutting conditions using a data mining method and Random Forest Regression (RFR) applied to a tool catalog database. In this study, we constructed a new cutting condition compensation system based on the existing model, which accounts for the tool overhang length. The results of cutting experiments under high aspect ratio overhang lengths confirm that the correction coefficients proposed by the system are significant. en-copyright= kn-copyright= en-aut-name=KODAMAHiroyuki en-aut-sei=KODAMA en-aut-mei=Hiroyuki kn-aut-name=児玉紘幸 kn-aut-sei=児玉 kn-aut-mei=紘幸 aut-affil-num=1 ORCID= en-aut-name=MORIYAYuki en-aut-sei=MORIYA en-aut-mei=Yuki kn-aut-name=守屋祐輝 kn-aut-sei=守屋 kn-aut-mei=祐輝 aut-affil-num=2 ORCID= en-aut-name=MORIMOTOTatsuo en-aut-sei=MORIMOTO en-aut-mei=Tatsuo kn-aut-name=盛元達雄 kn-aut-sei=盛元 kn-aut-mei=達雄 aut-affil-num=3 ORCID= en-aut-name=OHASHIKazuhito en-aut-sei=OHASHI en-aut-mei=Kazuhito kn-aut-name=大橋一仁 kn-aut-sei=大橋 kn-aut-mei=一仁 aut-affil-num=4 ORCID= affil-num=1 en-affil=Faculty of Environmental, Life, Natural Science and Technology, Okayama University kn-affil=岡山大学 学術研究院環境生命自然科学学域 affil-num=2 en-affil=Graduate school of Environmental, Life, Natural Science and Technology, Okayama University kn-affil=岡山大学 大学院環境生命自然科学研究科 affil-num=3 en-affil=Graduate school of Environmental, Life, Natural Science and Technology, Okayama University kn-affil=岡山大学 大学院環境生命自然科学研究科 affil-num=4 en-affil=Faculty of Environmental, Life, Natural Science and Technology, Okayama University kn-affil=岡山大学 学術研究院環境生命自然科学学域 en-keyword=Data mining kn-keyword=Data mining en-keyword=Cutting conditions kn-keyword=Cutting conditions en-keyword=Machine learning kn-keyword=Machine learning en-keyword=Random Forest Regression kn-keyword=Random Forest Regression en-keyword=Ball end-mill kn-keyword=Ball end-mill en-keyword=Tool overhang length kn-keyword=Tool overhang length END start-ver=1.4 cd-journal=joma no-vol=83 cd-vols= no-issue=845 article-no= start-page=16-00441 end-page= dt-received= dt-revised= dt-accepted= dt-pub-year=2017 dt-pub=2017 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Large-scale vortical structure detection using microphone array in a semiconductor single wafer spin cleaner kn-title=マイクロフォンアレイを用いた枚葉式半導体洗浄装置内に形成される大規模渦構造の検出 en-subtitle= kn-subtitle= en-abstract= kn-abstract= Fluctuating pressure (p’ ) of a large-scale vortical structure generated in a semiconductor single wafer spin cleaner was detected by using microphone array. Twelve microphones were installed on the exhaust cover under the rotating disk of the cleaner with their interval of 7.5° or 15°. Power spectrum densities (PSD) of p’ were compared with those of fluctuating velocity measured by PIV for various rotation angular velocities to identify fluctuations due to convection of the large-scale vortical structure. Good agreement of PSDs indicates that the large-scale structure could be detected by using microphone. Cross-correlation of p’ measured at different positions revealed that the large-scale structure convected to the downstream in the rotational direction of the disk. The convection speed was about 12 % of the angular velocity of the rotating disk. Number of the vortex in the large-scale structure was also evaluated from the time-series p’ data. Time-space contour map was made for p’ based on the data measured at the different angular position, and showed periodical swept strip patterns. Presences of the strip patterns indicate the pressure disturbances were stably convected to the downstream. From this time-space map, two-dimensional Fourier transform efficiently extracted the number of vortices in the large-scale structure. en-copyright= kn-copyright= en-aut-name=KOUCHIToshinori en-aut-sei=KOUCHI en-aut-mei=Toshinori kn-aut-name=河内俊憲 kn-aut-sei=河内 kn-aut-mei=俊憲 aut-affil-num=1 ORCID= en-aut-name=MIYOSHIYuki en-aut-sei=MIYOSHI en-aut-mei=Yuki kn-aut-name=三好勇輝 kn-aut-sei=三好 kn-aut-mei=勇輝 aut-affil-num=2 ORCID= en-aut-name=NAKANOYusuke en-aut-sei=NAKANO en-aut-mei=Yusuke kn-aut-name=中野裕介 kn-aut-sei=中野 kn-aut-mei=裕介 aut-affil-num=3 ORCID= en-aut-name=NAGATAYasunori en-aut-sei=NAGATA en-aut-mei=Yasunori kn-aut-name=永田靖典 kn-aut-sei=永田 kn-aut-mei=靖典 aut-affil-num=4 ORCID= en-aut-name=YANASEShinichiro en-aut-sei=YANASE en-aut-mei=Shinichiro kn-aut-name=柳瀬眞一郎 kn-aut-sei=柳瀬 kn-aut-mei=眞一郎 aut-affil-num=5 ORCID= affil-num=1 en-affil=Mechanical and System Engineering of Okayama University kn-affil=岡山大学大学院 自然科学研究科 affil-num=2 en-affil=Mechanical and System Engineering of Okayama University kn-affil=岡山大学大学院 自然科学研究科 affil-num=3 en-affil=Mechanical and System Engineering of Okayama University kn-affil=岡山大学大学院 自然科学研究科 affil-num=4 en-affil=Mechanical and System Engineering of Okayama University kn-affil=岡山大学大学院 自然科学研究科 affil-num=5 en-affil=Mechanical and System Engineering of Okayama University kn-affil=岡山大学大学院 自然科学研究科 en-keyword=Rotating disk kn-keyword=Rotating disk en-keyword=Flow stability kn-keyword=Flow stability en-keyword=Coherent structure kn-keyword=Coherent structure en-keyword=Differential pressure measurement kn-keyword=Differential pressure measurement END start-ver=1.4 cd-journal=joma no-vol=81 cd-vols= no-issue=829 article-no= start-page=15-00273 end-page= dt-received= dt-revised= dt-accepted= dt-pub-year=2015 dt-pub=2015 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Periodical structure of vortices in a semiconductor single wafer spin cleaner kn-title=枚葉式半導体洗浄装置内に形成される渦の周期構造 en-subtitle= kn-subtitle= en-abstract= kn-abstract= We experimentally and numerically investigated large-scale structures formed by vortices in a single wafer spin cleaner. The Q-criterion identified the vortices developed in the cleaner as the flow regions with positive second invariant of the velocity gradient tensor obtained by both the PIV and LES. The time-series two-components PIV data shows that small-vortices were clustered near and under the edge of the rotating disk and were periodically emanated from there to the housing wall of the cleaner. The emanation frequency was increased with increasing in the angular velocity of the rotating disk. Three-dimensional LES reveal that six longitudinal vortices were spirally developed from under the edge of the rotating disk to the housing wall. This structure stably rotated slower than the disk speed. Fourier analysis of the LES data agreed with that of the PIV data. This supports that the passages of the stable spiral vortices on the PIV measurement region resulted in the periodical emanation of the clustered small-vortices observed in the PIV. Such a very large-scale spiral structure will induce reattachment of contaminants on the wafer surface, and should be destructed for development of much higher efficient cleaner. en-copyright= kn-copyright= en-aut-name=KOUCHIToshinori en-aut-sei=KOUCHI en-aut-mei=Toshinori kn-aut-name=河内俊憲 kn-aut-sei=河内 kn-aut-mei=俊憲 aut-affil-num=1 ORCID= en-aut-name=FUKUDANaoya en-aut-sei=FUKUDA en-aut-mei=Naoya kn-aut-name=福田修也 kn-aut-sei=福田 kn-aut-mei=修也 aut-affil-num=2 ORCID= en-aut-name=NAKANOYusuke en-aut-sei=NAKANO en-aut-mei=Yusuke kn-aut-name=中野裕介 kn-aut-sei=中野 kn-aut-mei=裕介 aut-affil-num=3 ORCID= en-aut-name=SHIMIZUYoshiya en-aut-sei=SHIMIZU en-aut-mei=Yoshiya kn-aut-name=清水義也 kn-aut-sei=清水 kn-aut-mei=義也 aut-affil-num=4 ORCID= en-aut-name=NAGATAYasunori en-aut-sei=NAGATA en-aut-mei=Yasunori kn-aut-name=永田靖典 kn-aut-sei=永田 kn-aut-mei=靖典 aut-affil-num=5 ORCID= en-aut-name=YANASEShinichiro en-aut-sei=YANASE en-aut-mei=Shinichiro kn-aut-name=柳瀬眞一郎 kn-aut-sei=柳瀬 kn-aut-mei=眞一郎 aut-affil-num=6 ORCID= affil-num=1 en-affil=Mechanical and System Engineering of Okayama University kn-affil=岡山大学大学院 自然科学研究科 affil-num=2 en-affil=Mechanical and System Engineering of Okayama University kn-affil=岡山大学大学院 自然科学研究科 affil-num=3 en-affil=Mechanical and System Engineering of Okayama University kn-affil=岡山大学大学院 自然科学研究科 affil-num=4 en-affil=Mechanical and System Engineering of Okayama University kn-affil=岡山大学大学院 自然科学研究科 affil-num=5 en-affil=Mechanical and System Engineering of Okayama University kn-affil=岡山大学大学院 自然科学研究科 affil-num=6 en-affil=Mechanical and System Engineering of Okayama University kn-affil=岡山大学大学院 自然科学研究科 en-keyword=Rotating disk kn-keyword=Rotating disk en-keyword=Flow stability kn-keyword=Flow stability en-keyword=Large-scale structure kn-keyword=Large-scale structure en-keyword=PIV kn-keyword=PIV en-keyword=LES kn-keyword=LES END start-ver=1.4 cd-journal=joma no-vol=83 cd-vols= no-issue=853 article-no= start-page=17-00181 end-page= dt-received= dt-revised= dt-accepted= dt-pub-year=2017 dt-pub=2017 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=OpenFOAM analysis of air-entraining and submerged vortices in pump sump kn-title=OpenFOAMを用いたポンプ水槽内に発生する空気吸込渦と水中渦の解析 en-subtitle= kn-subtitle= en-abstract= kn-abstract= en-copyright= kn-copyright= en-aut-name=YAMASAKIRyo en-aut-sei=YAMASAKI en-aut-mei=Ryo kn-aut-name=山崎諒 kn-aut-sei=山崎 kn-aut-mei=諒 aut-affil-num=1 ORCID= en-aut-name=KOUCHIToshinori en-aut-sei=KOUCHI en-aut-mei=Toshinori kn-aut-name=河内俊憲 kn-aut-sei=河内 kn-aut-mei=俊憲 aut-affil-num=2 ORCID= en-aut-name=NAGATAYasunori en-aut-sei=NAGATA en-aut-mei=Yasunori kn-aut-name=永田靖典 kn-aut-sei=永田 kn-aut-mei=靖典 aut-affil-num=3 ORCID= en-aut-name=YANASEShinichiro en-aut-sei=YANASE en-aut-mei=Shinichiro kn-aut-name=柳瀬眞一郎 kn-aut-sei=柳瀬 kn-aut-mei=眞一郎 aut-affil-num=4 ORCID= affil-num=1 en-affil=Mechanical and System Engineering of Okayama University kn-affil=岡山大学大学院 自然科学研究科 affil-num=2 en-affil=Mechanical and System Engineering of Okayama University kn-affil=岡山大学大学院 自然科学研究科 affil-num=3 en-affil=Mechanical and System Engineering of Okayama University kn-affil=岡山大学大学院 自然科学研究科 affil-num=4 en-affil=Mechanical and System Engineering of Okayama University kn-affil=岡山大学大学院 自然科学研究科 en-keyword=CFD kn-keyword=CFD en-keyword=VOF kn-keyword=VOF en-keyword=Turbulance model kn-keyword=Turbulance model en-keyword=Grid convergence kn-keyword=Grid convergence en-keyword=Vortex detection scheme kn-keyword=Vortex detection scheme END start-ver=1.4 cd-journal=joma no-vol=77 cd-vols= no-issue=778 article-no= start-page=2323 end-page=2335 dt-received= dt-revised= dt-accepted= dt-pub-year=2011 dt-pub=201106 dt-online= en-article= kn-article= en-subject= kn-subject= en-title=Analysis and Control of Model to Develop Support Device Using Biarticular Muscle with Rubber Artificial Muscles kn-title=二関節筋型ゴム人工筋を用いた支援装置モデルの解析と制御 en-subtitle= kn-subtitle= en-abstract= kn-abstract=In this paper, the authors aim at developing a wearable power assist wear for lower limb The system requires compact size and lightweight to achieve a practical application, therefore we discuss its effective structure using biarticular muscle. At first, two model of targeting at support device for human lower limb is described, followed by showing each alignment of rubber artificial muscles. Next, construction force generated by rubber artificial muscles to achieve static balance is calculated. At the end, Experiment apparatus is designed from calculation and experimental results is showed. en-copyright= kn-copyright= en-aut-name=InabaTomoya en-aut-sei=Inaba en-aut-mei=Tomoya kn-aut-name=稲葉智也 kn-aut-sei=稲葉 kn-aut-mei=智也 aut-affil-num=1 ORCID= en-aut-name=NoritsuguToshiro en-aut-sei=Noritsugu en-aut-mei=Toshiro kn-aut-name=則次俊郎 kn-aut-sei=則次 kn-aut-mei=俊郎 aut-affil-num=2 ORCID= affil-num=1 en-affil= kn-affil=Okayama Univ. Dept. of System Engineering affil-num=2 en-affil= kn-affil=Okayama Univ. Dept. of System Engineering en-keyword=Biarticular Muscle kn-keyword=Biarticular Muscle en-keyword=Rubber Artificial Muscles kn-keyword=Rubber Artificial Muscles en-keyword=Pneumatic Actuator kn-keyword=Pneumatic Actuator END