Yosuke Ichiyanagi, Y. Michitsuji, A. Matsumoto, Yasuhiro Sato, H. Ohno, S. Ogata, M. Tanimoto, T. Fukushima, Takuya Matsuda, D. Shinagawa
{"title":"Simulation-based estimation of wheel/rail friction coefficient and wear number considering results of full-scale roller-rig test","authors":"Yosuke Ichiyanagi, Y. Michitsuji, A. Matsumoto, Yasuhiro Sato, H. Ohno, S. Ogata, M. Tanimoto, T. Fukushima, Takuya Matsuda, D. Shinagawa","doi":"10.1299/mej.22-00299","DOIUrl":"https://doi.org/10.1299/mej.22-00299","url":null,"abstract":"","PeriodicalId":45233,"journal":{"name":"Mechanical Engineering Journal","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66400296","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
S. Okajima, Takero Mori, N. Kikuchi, Masaaki Tanaka, M. Miyazaki
{"title":"Application of a first-order method to estimate the failure probability of component subjected to thermal transients for optimization of design parameters","authors":"S. Okajima, Takero Mori, N. Kikuchi, Masaaki Tanaka, M. Miyazaki","doi":"10.1299/mej.23-00042","DOIUrl":"https://doi.org/10.1299/mej.23-00042","url":null,"abstract":"","PeriodicalId":45233,"journal":{"name":"Mechanical Engineering Journal","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66402173","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Effect of temperature conditions of a heated plate on the crystallization of CFRTP","authors":"Yasuhiro Tasaka, R. Matsuzaki","doi":"10.1299/mej.23-00049","DOIUrl":"https://doi.org/10.1299/mej.23-00049","url":null,"abstract":"","PeriodicalId":45233,"journal":{"name":"Mechanical Engineering Journal","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66402271","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Effect of the plasticity of pipe and support on the seismic response of piping systems","authors":"T. Okuda, Hideki Takahashi, Tomoyoshi Watakabe","doi":"10.1299/mej.23-00075","DOIUrl":"https://doi.org/10.1299/mej.23-00075","url":null,"abstract":"","PeriodicalId":45233,"journal":{"name":"Mechanical Engineering Journal","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66403162","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Diamagnetic suspension with variable compliance for force sensing devices","authors":"Kazuhiro Katayama, M. Kageshima","doi":"10.1299/mej.23-00126","DOIUrl":"https://doi.org/10.1299/mej.23-00126","url":null,"abstract":"","PeriodicalId":45233,"journal":{"name":"Mechanical Engineering Journal","volume":"51 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66403345","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Non-destructive estimation of three-dimensional inelastic strain via nonlinear inverse analysis using displacement","authors":"Satoshi Fujii, M. Ogawa, Dai Hirabayashi","doi":"10.1299/mej.23-00191","DOIUrl":"https://doi.org/10.1299/mej.23-00191","url":null,"abstract":"","PeriodicalId":45233,"journal":{"name":"Mechanical Engineering Journal","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66404028","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Takeru MISU, Hisashi ISHIHARA, So NAGASHIMA, Yusuke DOI, Akihiro NAKATANI
Human faces are mechanical systems that display emotional and linguistic information with motions of the deformable facial tissues. Since each facial action forms a different stress-strain field that characterizes the differentiated facial appearance, a detailed analysis of strain distributions for each facial action will contribute to analytical and synthetical studies on human faces. This study evaluated strain distributions of 44 facial actions of a Japanese adult male based on the three-dimensional displacements of 125 tracking markers attached to the facial surface. We investigated how much the facial skin surface is stretched and compressed in each facial region based on the evaluated area strains produced by each facial action. Then, we visualized the strain distributions and surface undulation to analyze the complexity of the deformations on a face. The results show that the positive and negative surface strains intermingled on a face even in simple facial actions, potentially reflecting the complex facial structure under the facial skin layers, where several tissues with different material properties, e.g., adipose tissues and retaining ligaments, are distributed heterogeneously. These results are beneficial for artificial face designers as a design target and evidence to consider the effective skin structure and locations of actuators for artificial faces.
{"title":"Visualization and analysis of skin strain distribution in various human facial actions","authors":"Takeru MISU, Hisashi ISHIHARA, So NAGASHIMA, Yusuke DOI, Akihiro NAKATANI","doi":"10.1299/mej.23-00189","DOIUrl":"https://doi.org/10.1299/mej.23-00189","url":null,"abstract":"Human faces are mechanical systems that display emotional and linguistic information with motions of the deformable facial tissues. Since each facial action forms a different stress-strain field that characterizes the differentiated facial appearance, a detailed analysis of strain distributions for each facial action will contribute to analytical and synthetical studies on human faces. This study evaluated strain distributions of 44 facial actions of a Japanese adult male based on the three-dimensional displacements of 125 tracking markers attached to the facial surface. We investigated how much the facial skin surface is stretched and compressed in each facial region based on the evaluated area strains produced by each facial action. Then, we visualized the strain distributions and surface undulation to analyze the complexity of the deformations on a face. The results show that the positive and negative surface strains intermingled on a face even in simple facial actions, potentially reflecting the complex facial structure under the facial skin layers, where several tissues with different material properties, e.g., adipose tissues and retaining ligaments, are distributed heterogeneously. These results are beneficial for artificial face designers as a design target and evidence to consider the effective skin structure and locations of actuators for artificial faces.","PeriodicalId":45233,"journal":{"name":"Mechanical Engineering Journal","volume":"116 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135318388","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
To improve the load characteristics of the transmission error for helical gears, a gear made of laminated materials is proposed. The gear has three layers in which metals with different rigidities are laminated in the tooth width direction. The layers on both sides are made from the same metal, and a different metal is used for the central layer. A theoretical analysis was performed to investigate the effects of arranging high- and low-rigidity layers and changing the width of the central layer. The laminated gear has load characteristics different from the transmission error for a conventional homogeneous material gear. The transmission error can be reduced with the combination of a high-rigidity central layer and a low-rigidity side layers, and a low transmission error can be maintained over a wide load range by adjusting the central layer width appropriately. The principle of the reduction in the transmission error is that, by changing the rigidity along one-pitch meshing progress with laminated materials, the elastic deformation of the teeth can largely cancel out the rotational fluctuations caused by the tooth flank shape over the wide load range. A pair of laminated gears was manufactured, and testing confirmed that the laminated gear has a transmission error lower than that for a gear made from a homogeneous material. The laminated gear has the potential to achieve the lower vibration/noise generation for the wider load range than the homogeneous gear.
{"title":"Basic study on transmission error for gear made from different metals laminated in width direction to provide rigidity distribution","authors":"Fumitaka YOSHIZUMI, Takayuki AOYAMA, Yoshikatsu SHIBATA","doi":"10.1299/mej.23-00163","DOIUrl":"https://doi.org/10.1299/mej.23-00163","url":null,"abstract":"To improve the load characteristics of the transmission error for helical gears, a gear made of laminated materials is proposed. The gear has three layers in which metals with different rigidities are laminated in the tooth width direction. The layers on both sides are made from the same metal, and a different metal is used for the central layer. A theoretical analysis was performed to investigate the effects of arranging high- and low-rigidity layers and changing the width of the central layer. The laminated gear has load characteristics different from the transmission error for a conventional homogeneous material gear. The transmission error can be reduced with the combination of a high-rigidity central layer and a low-rigidity side layers, and a low transmission error can be maintained over a wide load range by adjusting the central layer width appropriately. The principle of the reduction in the transmission error is that, by changing the rigidity along one-pitch meshing progress with laminated materials, the elastic deformation of the teeth can largely cancel out the rotational fluctuations caused by the tooth flank shape over the wide load range. A pair of laminated gears was manufactured, and testing confirmed that the laminated gear has a transmission error lower than that for a gear made from a homogeneous material. The laminated gear has the potential to achieve the lower vibration/noise generation for the wider load range than the homogeneous gear.","PeriodicalId":45233,"journal":{"name":"Mechanical Engineering Journal","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135498337","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Susumu YAMASHITA, Shinichiro UESAWA, Ayako ONO, Hiroyuki YOSHIDA
A detailed evaluation for air cooling of fuel debris in actual reactors will be essential in fuel debris retrieval under dry conditions. To understand the heat transfer in and around fuel debris, which is assumed as a porous medium in the primary containment vessel (PCV) mechanistically, we newly applied the porous medium model to the multiphase and multicomponent computational fluid dynamics code named JUPITER (JAEA Utility Program for Interdisciplinary Thermal-hydraulics Engineering and Research). We applied the Darcy–Brinkman model as for the porous medium model. This model has high compatibility with JUPITER because it can treat both a pure fluid and a porous medium phase simultaneously in the same manner as the one-fluid model in multiphase flow simulation. We addressed the case of natural convection with a high-velocity flow standing out nonlinear effects by implementing the Forchheimer model, including the term of the square of the velocity as a nonlinear effect to the momentum transport equation of JUPITER. We performed some simple verification and validation simulations, such as the natural convection simulation in a square cavity and the natural convective heat transfer experiment with the porous medium, to confirm the validity of the implemented model. We confirmed that the result of JUPITER agreed well with these simulations and experiments. In addition, as an application of the updated JUPITER, we performed the preliminary simulation of air cooling of fuel debris in the condition of the Fukushima Daiichi Nuclear Power Station unit 2 including the actual core materials. As a result, JUPITER calculated the temperature and velocity field stably in and around the fuel debris inside the PCV. Therefore, JUPITER has the potential to estimate the detailed and accurate thermal-hydraulics behaviors of fuel debris.
{"title":"Development of a numerical simulation method for air cooling of fuel debris by JUPITER","authors":"Susumu YAMASHITA, Shinichiro UESAWA, Ayako ONO, Hiroyuki YOSHIDA","doi":"10.1299/mej.22-00485","DOIUrl":"https://doi.org/10.1299/mej.22-00485","url":null,"abstract":"A detailed evaluation for air cooling of fuel debris in actual reactors will be essential in fuel debris retrieval under dry conditions. To understand the heat transfer in and around fuel debris, which is assumed as a porous medium in the primary containment vessel (PCV) mechanistically, we newly applied the porous medium model to the multiphase and multicomponent computational fluid dynamics code named JUPITER (JAEA Utility Program for Interdisciplinary Thermal-hydraulics Engineering and Research). We applied the Darcy–Brinkman model as for the porous medium model. This model has high compatibility with JUPITER because it can treat both a pure fluid and a porous medium phase simultaneously in the same manner as the one-fluid model in multiphase flow simulation. We addressed the case of natural convection with a high-velocity flow standing out nonlinear effects by implementing the Forchheimer model, including the term of the square of the velocity as a nonlinear effect to the momentum transport equation of JUPITER. We performed some simple verification and validation simulations, such as the natural convection simulation in a square cavity and the natural convective heat transfer experiment with the porous medium, to confirm the validity of the implemented model. We confirmed that the result of JUPITER agreed well with these simulations and experiments. In addition, as an application of the updated JUPITER, we performed the preliminary simulation of air cooling of fuel debris in the condition of the Fukushima Daiichi Nuclear Power Station unit 2 including the actual core materials. As a result, JUPITER calculated the temperature and velocity field stably in and around the fuel debris inside the PCV. Therefore, JUPITER has the potential to estimate the detailed and accurate thermal-hydraulics behaviors of fuel debris.","PeriodicalId":45233,"journal":{"name":"Mechanical Engineering Journal","volume":"231 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"135734307","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
{"title":"Substructure elimination method for vibration systems governed by a one-dimensional wave equation","authors":"Keisuke Yamada, J. Ji","doi":"10.1299/mej.23-00241","DOIUrl":"https://doi.org/10.1299/mej.23-00241","url":null,"abstract":"","PeriodicalId":45233,"journal":{"name":"Mechanical Engineering Journal","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66404086","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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