Pub Date : 2021-10-06DOI: 10.1299/transjsme.21-00228
K. Nagase, Kunio Taniuchi
{"title":"Wave analysis and control of two-dimensionally connected damped mass-spring systems (Analysis based on analytic properties of secondary constants)","authors":"K. Nagase, Kunio Taniuchi","doi":"10.1299/transjsme.21-00228","DOIUrl":"https://doi.org/10.1299/transjsme.21-00228","url":null,"abstract":"","PeriodicalId":341040,"journal":{"name":"Transactions of the JSME (in Japanese)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132825540","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}
Pub Date : 2021-09-30DOI: 10.1299/transjsme.21-00237
Chikako Natsumeda, K. Matsui, Junichi Tatami, Takahiro Yamada
{"title":"Simulation of sintering ceramics based on Master Sintering Curve","authors":"Chikako Natsumeda, K. Matsui, Junichi Tatami, Takahiro Yamada","doi":"10.1299/transjsme.21-00237","DOIUrl":"https://doi.org/10.1299/transjsme.21-00237","url":null,"abstract":"","PeriodicalId":341040,"journal":{"name":"Transactions of the JSME (in Japanese)","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-09-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115502235","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}
Pub Date : 2021-06-01DOI: 10.1299/TRANSJSME.21-00010
Hiroto Tanaka, T. Misaka, Koji Fujita, H. Nagai
Thermal analysis of spacecraft is one of the most important processes to ensure the safety of spacecraft systems. However, the thermal mathematical model has uncertainty such as thermal contact conductance or thermal optical properties. These uncertain parameters in the model are non-negligible for long-term missions because these parameters can change during operation on orbit. Despite the uncertainties, the spacecraft system has only a few onboard temperature sensors compared to large and complex systems. In this study, an advanced thermal analysis method based on data assimilation is proposed to estimate the thermal state of a complex system with limited temperature data. Firstly, this paper describes a new state estimation algorithm called Assisted Ensemble Kalman Filter, which is an advanced state estimation algorithm based on Ensemble Kalman Filter (EnKF). Here, an external estimation algorithm by calculating the heat balance equation was applied to the conventional method to improve the estimation performance of the EnKF. Secondly, we propose a new parameter that indicates observability based on heat flux and temperature sensitivity, and the influence of temperature sensor location on estimation performance was discussed. These proposed approaches were applied to a simple thermal mathematical model, and numerical experiments have confirmed their availability.
{"title":"Thermal state estimation based on Assisted Ensemble Kalman Filter","authors":"Hiroto Tanaka, T. Misaka, Koji Fujita, H. Nagai","doi":"10.1299/TRANSJSME.21-00010","DOIUrl":"https://doi.org/10.1299/TRANSJSME.21-00010","url":null,"abstract":"Thermal analysis of spacecraft is one of the most important processes to ensure the safety of spacecraft systems. However, the thermal mathematical model has uncertainty such as thermal contact conductance or thermal optical properties. These uncertain parameters in the model are non-negligible for long-term missions because these parameters can change during operation on orbit. Despite the uncertainties, the spacecraft system has only a few onboard temperature sensors compared to large and complex systems. In this study, an advanced thermal analysis method based on data assimilation is proposed to estimate the thermal state of a complex system with limited temperature data. Firstly, this paper describes a new state estimation algorithm called Assisted Ensemble Kalman Filter, which is an advanced state estimation algorithm based on Ensemble Kalman Filter (EnKF). Here, an external estimation algorithm by calculating the heat balance equation was applied to the conventional method to improve the estimation performance of the EnKF. Secondly, we propose a new parameter that indicates observability based on heat flux and temperature sensitivity, and the influence of temperature sensor location on estimation performance was discussed. These proposed approaches were applied to a simple thermal mathematical model, and numerical experiments have confirmed their availability.","PeriodicalId":341040,"journal":{"name":"Transactions of the JSME (in Japanese)","volume":"136 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134320296","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}
Pub Date : 2021-02-22DOI: 10.1299/TRANSJSME.20-00288
R. Fukui, Tetsuyou Watanabe
This paper reports the launching and organizing procedures of Robomech 2020, the first online conference in the history of Robomech series. We discuss the required functions of an online academic conference and show an implementation example. Analysis of the conference results and responses from the participants reveals the advantages and disadvantages of Facebook that is used as a platform of the online conference. The analysis also indicates the constitutive problems of the online conference. Consequently, this paper provides multiple clues for constructing a new platform suitable for more active and efficient online academic conferences.
{"title":"A trial of a poster-based online academic conference using Facebook as a platform (Validation of Robomech 2020)","authors":"R. Fukui, Tetsuyou Watanabe","doi":"10.1299/TRANSJSME.20-00288","DOIUrl":"https://doi.org/10.1299/TRANSJSME.20-00288","url":null,"abstract":"This paper reports the launching and organizing procedures of Robomech 2020, the first online conference in the history of Robomech series. We discuss the required functions of an online academic conference and show an implementation example. Analysis of the conference results and responses from the participants reveals the advantages and disadvantages of Facebook that is used as a platform of the online conference. The analysis also indicates the constitutive problems of the online conference. Consequently, this paper provides multiple clues for constructing a new platform suitable for more active and efficient online academic conferences.","PeriodicalId":341040,"journal":{"name":"Transactions of the JSME (in Japanese)","volume":"60 1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-02-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121537408","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}
Pub Date : 2021-02-09DOI: 10.1299/TRANSJSME.20-00438
M. Yamane, Shota Nakakubo, Koutarou Koizumi, H. Uematsu, S. Tanoue
The effect of layer thickness of prepreg on the static and dynamic flexural properties of quasi-isotropic carbon fiber reinforced polyamide 6 laminates were investigated. The layer thickness of each ply was set to 40, 80 and 120 µm by using thin-ply prepreg with a thickness of about 40 µm made by tow-spreading technology. Four-point flexural tests were carried out to evaluate the static flexural properties of the laminated materials. The results showed that the flexural strength and modulus did not change much as the layer thickness change. The delamination at interlaminar was interestingly inhibited with decrease of layer thickness. Charpy impact strength evaluated as the dynamic flexural properties was affected by the layer thickness depending on the impact direction. In the impact test where the applied load was parallel to the laminates (edgewise test), the Charpy impact strength was almost unaffected by the layer thickness change. In contrast, Charpy impact strength increased with increasing layer thickness where the applied load was normal to the laminates (flatwise test). In the observation of the fracture appearance after edgewise test, the fiber fractures were observed independent of the layer thickness. Meanwhile, the occurrence of the cracking and delamination at interlaminar were effectively suppressed with decrease of layer thickness in the specimen after flatwise test. The delamination at interlaminar progressed in the in-plane direction with increasing layer thickness, resulting in large-scale delamination. As a result, a large amount of fracture energy could be absorbed. In conclusion, the layer thickness of the laminate is an important material design factor for controlling the impact properties of the composite materials.
{"title":"Effect of layer thickness of prepreg on static and dynamic flexural properties of continuous carbon fiber reinforced polyamide 6","authors":"M. Yamane, Shota Nakakubo, Koutarou Koizumi, H. Uematsu, S. Tanoue","doi":"10.1299/TRANSJSME.20-00438","DOIUrl":"https://doi.org/10.1299/TRANSJSME.20-00438","url":null,"abstract":"The effect of layer thickness of prepreg on the static and dynamic flexural properties of quasi-isotropic carbon fiber reinforced polyamide 6 laminates were investigated. The layer thickness of each ply was set to 40, 80 and 120 µm by using thin-ply prepreg with a thickness of about 40 µm made by tow-spreading technology. Four-point flexural tests were carried out to evaluate the static flexural properties of the laminated materials. The results showed that the flexural strength and modulus did not change much as the layer thickness change. The delamination at interlaminar was interestingly inhibited with decrease of layer thickness. Charpy impact strength evaluated as the dynamic flexural properties was affected by the layer thickness depending on the impact direction. In the impact test where the applied load was parallel to the laminates (edgewise test), the Charpy impact strength was almost unaffected by the layer thickness change. In contrast, Charpy impact strength increased with increasing layer thickness where the applied load was normal to the laminates (flatwise test). In the observation of the fracture appearance after edgewise test, the fiber fractures were observed independent of the layer thickness. Meanwhile, the occurrence of the cracking and delamination at interlaminar were effectively suppressed with decrease of layer thickness in the specimen after flatwise test. The delamination at interlaminar progressed in the in-plane direction with increasing layer thickness, resulting in large-scale delamination. As a result, a large amount of fracture energy could be absorbed. In conclusion, the layer thickness of the laminate is an important material design factor for controlling the impact properties of the composite materials.","PeriodicalId":341040,"journal":{"name":"Transactions of the JSME (in Japanese)","volume":"32 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-02-09","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"128118475","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}
Pub Date : 2021-01-01DOI: 10.1299/TRANSJSME.20-00361
Ouga Sasaki, Wataru Higuma, Satoshi Sakaida, Kotaro Tanaka, M. Konno, Takeshi Seto, N. Ishikawa
The fuel generated from CO2 and H2 derived from renewable energy is called “e-fuel”. Among the e-fuels, polyoxymethylene dimethyl ether (OME) is expected as a promising drop-in fuel for CI engines because it has good ignitability and low-soot combustion characteristics. However, the fuel properties such as density, heating value, and stoichiometric air-fuel ratio are different from those of diesel fuel. In this study, the spray and combustion characteristics of OME-diesel blends fuel were investigated and compared with diesel spray under engine-relevant condition at 920K-6.0MPa in a constant volume vessel. First, the fuel sprays were observed using high speed cameras under the non-reacting condition with O2 concentration of 0%. The result showed that spray-tip penetration length of OME-diesel blends was almost the same as diesel fuel, irrespective of the OME blend ratios, while the spray cone angle and spray projected area increased as the OME blend ratio increased. Moreover, the liquid phase length and width of OME spray were smaller than diesel spray. Then the reacting sprays were observed under the combustion condition with O2 concentration of 16% to understand combustion characteristics. The result showed that the ignition delay and the flame lift-off length were shortened as the OME blend ratio increased.
{"title":"Observation of OME-diesel blends spray injected by a single-hole nozzle injector under engine-relevant conditions","authors":"Ouga Sasaki, Wataru Higuma, Satoshi Sakaida, Kotaro Tanaka, M. Konno, Takeshi Seto, N. Ishikawa","doi":"10.1299/TRANSJSME.20-00361","DOIUrl":"https://doi.org/10.1299/TRANSJSME.20-00361","url":null,"abstract":"The fuel generated from CO2 and H2 derived from renewable energy is called “e-fuel”. Among the e-fuels, polyoxymethylene dimethyl ether (OME) is expected as a promising drop-in fuel for CI engines because it has good ignitability and low-soot combustion characteristics. However, the fuel properties such as density, heating value, and stoichiometric air-fuel ratio are different from those of diesel fuel. In this study, the spray and combustion characteristics of OME-diesel blends fuel were investigated and compared with diesel spray under engine-relevant condition at 920K-6.0MPa in a constant volume vessel. First, the fuel sprays were observed using high speed cameras under the non-reacting condition with O2 concentration of 0%. The result showed that spray-tip penetration length of OME-diesel blends was almost the same as diesel fuel, irrespective of the OME blend ratios, while the spray cone angle and spray projected area increased as the OME blend ratio increased. Moreover, the liquid phase length and width of OME spray were smaller than diesel spray. Then the reacting sprays were observed under the combustion condition with O2 concentration of 16% to understand combustion characteristics. The result showed that the ignition delay and the flame lift-off length were shortened as the OME blend ratio increased.","PeriodicalId":341040,"journal":{"name":"Transactions of the JSME (in Japanese)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129444167","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}
Pub Date : 2020-08-25DOI: 10.1299/JSMEDMC.2020.521
K. Yamazaki, Fujiko Abe, I. Hagiwara
The Japanese traditional fan, which is a form of origami originating in Japan with a folding culture, has a variety of three-dimensional expression that differs from two-dimensional expression. The image painted on the fan deforms when the fan is folded. In this study, we create a digital fan model for clarifying the deformation on the fan face according to parameters such as length of the bamboo bones. We then validate the digital model with an actual fan. Furthermore, we obtain the original plan view from images of the folded fan as a reverse problem. Because folding fans are made of paper and bamboo and held in the hand, old traditional folding fans are more or less damaged; for example, many culturally valuable folding fans have lost their bones and have damaged edges, have been stretched flat, and have been framed like paintings. Reproducing the original fan without information of the original form is difficult. In the present study, we provide a digital fan model for examining the original fan shape. Old valuable folding fans are treasured by museums and collectors around the world. In future research, we would like to capture such precious folding fans in three-dimensional space applying our digital fan model and to exhibit these fans in a digital museum, providing opportunities not only to enjoy the value of the fans but also to encourage the research of Japanese traditional culture.
{"title":"Mathematical elucidation of the traditional Japanese fan focusing on its structure","authors":"K. Yamazaki, Fujiko Abe, I. Hagiwara","doi":"10.1299/JSMEDMC.2020.521","DOIUrl":"https://doi.org/10.1299/JSMEDMC.2020.521","url":null,"abstract":"\u0000 The Japanese traditional fan, which is a form of origami originating in Japan with a folding culture, has a variety of three-dimensional expression that differs from two-dimensional expression. The image painted on the fan deforms when the fan is folded. In this study, we create a digital fan model for clarifying the deformation on the fan face according to parameters such as length of the bamboo bones. We then validate the digital model with an actual fan. Furthermore, we obtain the original plan view from images of the folded fan as a reverse problem. Because folding fans are made of paper and bamboo and held in the hand, old traditional folding fans are more or less damaged; for example, many culturally valuable folding fans have lost their bones and have damaged edges, have been stretched flat, and have been framed like paintings. Reproducing the original fan without information of the original form is difficult. In the present study, we provide a digital fan model for examining the original fan shape. Old valuable folding fans are treasured by museums and collectors around the world. In future research, we would like to capture such precious folding fans in three-dimensional space applying our digital fan model and to exhibit these fans in a digital museum, providing opportunities not only to enjoy the value of the fans but also to encourage the research of Japanese traditional culture.","PeriodicalId":341040,"journal":{"name":"Transactions of the JSME (in Japanese)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127463723","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}
Pub Date : 2020-08-25DOI: 10.1299/JSMEDMC.2020.235
Tsuyoshi Fukasawa, Takayuki Miyagawa, M. Uchita, Tomohiko Yamamoto, M. Miyazaki, S. Okamura, S. Fujita
{"title":"Fundamental study on seismic safety margin for seismic isolated structure using the laminated rubber bearings","authors":"Tsuyoshi Fukasawa, Takayuki Miyagawa, M. Uchita, Tomohiko Yamamoto, M. Miyazaki, S. Okamura, S. Fujita","doi":"10.1299/JSMEDMC.2020.235","DOIUrl":"https://doi.org/10.1299/JSMEDMC.2020.235","url":null,"abstract":"","PeriodicalId":341040,"journal":{"name":"Transactions of the JSME (in Japanese)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126270882","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}
Pub Date : 2020-08-25DOI: 10.1299/TRANSJSME.20-00389
Kazuomi Ichikawa, Hiroyuki Sakai, H. Kominato, Shosuke Oseto, Guo Honghu, A. Takezawa, M. Kitamura
The granular damper enables damping of vibration by enclosing a plurality of particles in the structure. The vibration damping principle of the granular damper is the dissipation of energy due to friction between particles. Since this damper is easy to install, it has been applied research as a vibration control structure for various machines. In order to ensure vibration damping performance and perform design, it is necessary to predict the frictional force between particles and the collision force with a container by simulation. The purpose of this research is to propose the evaluation method of the vibration damping performance of the granular damper and the prediction method by the discretized element method using the fine particles with the basic particle diameter of 100 m or less. As for the experimental method, various evaluations have been made possible by a simple test method in which fine particles are enclosed in a metal plate. With this test method, we succeeded in obtaining a good damping effect even with a granular damper with a particle size of 100 m or less, and finding the control factors necessary for design.
{"title":"Study on damping performance for granular damper using fine particles","authors":"Kazuomi Ichikawa, Hiroyuki Sakai, H. Kominato, Shosuke Oseto, Guo Honghu, A. Takezawa, M. Kitamura","doi":"10.1299/TRANSJSME.20-00389","DOIUrl":"https://doi.org/10.1299/TRANSJSME.20-00389","url":null,"abstract":"The granular damper enables damping of vibration by enclosing a plurality of particles in the structure. The vibration damping principle of the granular damper is the dissipation of energy due to friction between particles. Since this damper is easy to install, it has been applied research as a vibration control structure for various machines. In order to ensure vibration damping performance and perform design, it is necessary to predict the frictional force between particles and the collision force with a container by simulation. The purpose of this research is to propose the evaluation method of the vibration damping performance of the granular damper and the prediction method by the discretized element method using the fine particles with the basic particle diameter of 100 m or less. As for the experimental method, various evaluations have been made possible by a simple test method in which fine particles are enclosed in a metal plate. With this test method, we succeeded in obtaining a good damping effect even with a granular damper with a particle size of 100 m or less, and finding the control factors necessary for design.","PeriodicalId":341040,"journal":{"name":"Transactions of the JSME (in Japanese)","volume":"18 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134258913","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}
Pub Date : 2020-08-25DOI: 10.1299/JSMEDMC.2020.624
N. Nagata, R. Kawashita, Yoshimine Chihiro, R. Hombo
In this paper, vibrational frequency effect in dynamic coefficients of tilting pad journal bearing is verified experimentally. Tilting pad journal bearings (TPJB) is applied in various turbomachinery. Accurate evaluation of the bearing characteristics of TPJB is very important to ensure reliability of rotating machinery. To evaluate the stability of such rotating machinery for sub-synchronous vibration accurately, examination of damped vibrational frequency effects in dynamic coefficients of TPJB under various bearing load condition is necessary. In this study, excitation test with test rig of 4pad TPJB with two types of preload or pad offset ratio is carried out in various load condition. Especially, the test condition where the influence of fluid inertia is small is focused. Frequency effect in dynamic coefficients of TPJB is verified experimentally under the test condition. And, thermo-elastic-hydrodynamic-lubrication (TEHL) analysis is carried out. By comparing analytical results to experimental results, good agreement with experimental result and TEHL analytical result is confirmed. In addition, the influence of bearing load, load direction, pre-load or pad offset ratio on frequency effect is confirmed experimentally and analytically. The results that the frequency effect is larger as bearing load is lower (Sommerfeld number is larger), and the influence of pre-load of bearing on frequency effect is small and that of pad offset ratio (pivot position) is large is obtained.
{"title":"Experimental verification of frequency effects in tilting pad journal bearing dynamic coefficients","authors":"N. Nagata, R. Kawashita, Yoshimine Chihiro, R. Hombo","doi":"10.1299/JSMEDMC.2020.624","DOIUrl":"https://doi.org/10.1299/JSMEDMC.2020.624","url":null,"abstract":"In this paper, vibrational frequency effect in dynamic coefficients of tilting pad journal bearing is verified experimentally. Tilting pad journal bearings (TPJB) is applied in various turbomachinery. Accurate evaluation of the bearing characteristics of TPJB is very important to ensure reliability of rotating machinery. To evaluate the stability of such rotating machinery for sub-synchronous vibration accurately, examination of damped vibrational frequency effects in dynamic coefficients of TPJB under various bearing load condition is necessary. In this study, excitation test with test rig of 4pad TPJB with two types of preload or pad offset ratio is carried out in various load condition. Especially, the test condition where the influence of fluid inertia is small is focused. Frequency effect in dynamic coefficients of TPJB is verified experimentally under the test condition. And, thermo-elastic-hydrodynamic-lubrication (TEHL) analysis is carried out. By comparing analytical results to experimental results, good agreement with experimental result and TEHL analytical result is confirmed. In addition, the influence of bearing load, load direction, pre-load or pad offset ratio on frequency effect is confirmed experimentally and analytically. The results that the frequency effect is larger as bearing load is lower (Sommerfeld number is larger), and the influence of pre-load of bearing on frequency effect is small and that of pad offset ratio (pivot position) is large is obtained.","PeriodicalId":341040,"journal":{"name":"Transactions of the JSME (in Japanese)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-08-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"132648248","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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