Pub Date : 2021-11-01DOI: 10.1299/jsmehs.2021.58.d044
Ryoma Morisaki, O. Terashima, Fumiya Kinoshita, Hideaki Touyama
In this study, we aimed to achieve a human-adaptive vibration design in a vehicle cabin based on the sensory characteristics of the passengers. To this end, the psychological stress of the passengers as a result of the vibration of the seats in a commercial vehicle was studied. As an initial step, the vibrational acceleration of the seat was measured and its modal analysis was performed. We measured 22 points and 10 points of vibrational acceleration in three directions (vertical, longitudinal, and lateral) of the seat and its occupant, respectively, in a commercial vehicle. We then performed a modal analysis with the obtained data. The results show that the seat had four distinct vibrational modes in the idle state: vertical, horizontal, folding, and rising. The amplitude of the folding mode vibration was 24 Hz, which was consistent with the second-order vibration of the vehicle’s engine. This was the largest vibration of the seat. We also measured the brain and pulse waves of the seat’s occupant to estimate the psychological stress caused by the seat vibration. The results show that psychological stress can be estimated using brain waves. However, pulse waves were not suitable for estimating the psychological stress of the occupant owing to the negative influence of the noise caused by the engine on such waves. We also found that the sensitivity of the occupant to seat vibration can be estimated from the results of spectral analysis of the occupant’s gravity center.
{"title":"On the vibration transfer characteristics from the seat of the vehicle to the occupant","authors":"Ryoma Morisaki, O. Terashima, Fumiya Kinoshita, Hideaki Touyama","doi":"10.1299/jsmehs.2021.58.d044","DOIUrl":"https://doi.org/10.1299/jsmehs.2021.58.d044","url":null,"abstract":"\u0000 In this study, we aimed to achieve a human-adaptive vibration design in a vehicle cabin based on the sensory characteristics of the passengers. To this end, the psychological stress of the passengers as a result of the vibration of the seats in a commercial vehicle was studied. As an initial step, the vibrational acceleration of the seat was measured and its modal analysis was performed. We measured 22 points and 10 points of vibrational acceleration in three directions (vertical, longitudinal, and lateral) of the seat and its occupant, respectively, in a commercial vehicle. We then performed a modal analysis with the obtained data. The results show that the seat had four distinct vibrational modes in the idle state: vertical, horizontal, folding, and rising. The amplitude of the folding mode vibration was 24 Hz, which was consistent with the second-order vibration of the vehicle’s engine. This was the largest vibration of the seat. We also measured the brain and pulse waves of the seat’s occupant to estimate the psychological stress caused by the seat vibration. The results show that psychological stress can be estimated using brain waves. However, pulse waves were not suitable for estimating the psychological stress of the occupant owing to the negative influence of the noise caused by the engine on such waves. We also found that the sensitivity of the occupant to seat vibration can be estimated from the results of spectral analysis of the occupant’s gravity center.","PeriodicalId":275370,"journal":{"name":"The Proceedings of Conference of Hokuriku-Shinetsu Branch","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-11-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127585902","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 : 2021-08-01DOI: 10.1299/jsmehs.2020.57.i021
Taisei Ito, Ryoma Morisaki, O. Terashima, H. Yamada, S. Mizukami, T. Miyajima
This study investigates the difference of performance sounds of an electric guitar with a metal pickguard. The sounds of the open strings of the guitar are measured, showing that the damping time becomes shorter than that obtained with a commonly used plastic pickguard. Further, it was also found that the sounds of the 1 and 2 strings were distinct and those of the other strings were slightly suppressed when the metal pickguard was used. Therefore, the metal pickguard is effective in making sharp, clear, and distinct sounds. We changed the material of the pickguard from plastic to copper. In the experiments, simultaneous measurements of the vibrational acceleration of the peg, pickguard, and output voltage of the guitar with a constant plucking force of the strings were performed. It was found that the profile of the RMS value of the vibrational acceleration of the pickguard changed when the copper pickguard was used. Moreover, the vibrational modes of copper the pickguard were different than the others. In conclusion, it was determined that the sound quality is affected by the vibrational characteristics; thus, it can be adjusted by varying the means by which the pickguard is attached to the guitar body.
{"title":"On the performance sound design of a stringed instrument by the control of the stiffness and mass of the component part","authors":"Taisei Ito, Ryoma Morisaki, O. Terashima, H. Yamada, S. Mizukami, T. Miyajima","doi":"10.1299/jsmehs.2020.57.i021","DOIUrl":"https://doi.org/10.1299/jsmehs.2020.57.i021","url":null,"abstract":"This study investigates the difference of performance sounds of an electric guitar with a metal pickguard. The sounds of the open strings of the guitar are measured, showing that the damping time becomes shorter than that obtained with a commonly used plastic pickguard. Further, it\u0000 was also found that the sounds of the 1 and 2 strings were distinct and those of the other strings were slightly suppressed when the metal pickguard was used. Therefore, the metal pickguard is effective in making sharp, clear, and distinct sounds. We changed the material of the pickguard from\u0000 plastic to copper. In the experiments, simultaneous measurements of the vibrational acceleration of the peg, pickguard, and output voltage of the guitar with a constant plucking force of the strings were performed. It was found that the profile of the RMS value of the vibrational acceleration\u0000 of the pickguard changed when the copper pickguard was used. Moreover, the vibrational modes of copper the pickguard were different than the others. In conclusion, it was determined that the sound quality is affected by the vibrational characteristics; thus, it can be adjusted by varying the\u0000 means by which the pickguard is attached to the guitar body.","PeriodicalId":275370,"journal":{"name":"The Proceedings of Conference of Hokuriku-Shinetsu Branch","volume":"291 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126423970","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 : 1900-01-01DOI: 10.1299/jsmehs.2019.56.c011
T. Okubo, A. Tezaki
{"title":"Influence of rotational speed fluctuation on thermal analysis","authors":"T. Okubo, A. Tezaki","doi":"10.1299/jsmehs.2019.56.c011","DOIUrl":"https://doi.org/10.1299/jsmehs.2019.56.c011","url":null,"abstract":"","PeriodicalId":275370,"journal":{"name":"The Proceedings of Conference of Hokuriku-Shinetsu Branch","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121067230","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 : 1900-01-01DOI: 10.1299/jsmehs.2021.58.f041
Kazutoshi Hiraki, K. Mizobe, K. Kida
{"title":"Relation between groove and friction in PEEK-PTFE radial ball bearings under dry conditions at 1200rpm","authors":"Kazutoshi Hiraki, K. Mizobe, K. Kida","doi":"10.1299/jsmehs.2021.58.f041","DOIUrl":"https://doi.org/10.1299/jsmehs.2021.58.f041","url":null,"abstract":"","PeriodicalId":275370,"journal":{"name":"The Proceedings of Conference of Hokuriku-Shinetsu Branch","volume":"197 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121070851","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 : 1900-01-01DOI: 10.1299/jsmehs.2019.56.h033
Y. Ozeki, T. Kurahashi, E. Katamine
{"title":"Shape optimization of channel considering effect of body rotation in flow field","authors":"Y. Ozeki, T. Kurahashi, E. Katamine","doi":"10.1299/jsmehs.2019.56.h033","DOIUrl":"https://doi.org/10.1299/jsmehs.2019.56.h033","url":null,"abstract":"","PeriodicalId":275370,"journal":{"name":"The Proceedings of Conference of Hokuriku-Shinetsu Branch","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125046593","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 : 1900-01-01DOI: 10.1299/jsmehs.2019.56.e022
Ryo Tokutake, N. Kanzaki, W. Takahashi, K. Tsunoda
{"title":"Interaction between supersonic flow and DC discharge plasma generated on a flat plate airfoil","authors":"Ryo Tokutake, N. Kanzaki, W. Takahashi, K. Tsunoda","doi":"10.1299/jsmehs.2019.56.e022","DOIUrl":"https://doi.org/10.1299/jsmehs.2019.56.e022","url":null,"abstract":"","PeriodicalId":275370,"journal":{"name":"The Proceedings of Conference of Hokuriku-Shinetsu Branch","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125050126","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 : 1900-01-01DOI: 10.1299/jsmehs.2019.56.i011
Kanako Tamada, S. Kitayama
{"title":"Short-term prediction using radial basis function network incorporating coordinate transformation","authors":"Kanako Tamada, S. Kitayama","doi":"10.1299/jsmehs.2019.56.i011","DOIUrl":"https://doi.org/10.1299/jsmehs.2019.56.i011","url":null,"abstract":"","PeriodicalId":275370,"journal":{"name":"The Proceedings of Conference of Hokuriku-Shinetsu Branch","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126080490","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 : 1900-01-01DOI: 10.1299/jsmehs.2019.56.j022
Toshihiro Shimada, Y. Iwata, T. Komatsuzaki, H. Asanuma
{"title":"Study on Measurement of Vibration Intensity Using Two Dimensional Laser Displacement Sensor","authors":"Toshihiro Shimada, Y. Iwata, T. Komatsuzaki, H. Asanuma","doi":"10.1299/jsmehs.2019.56.j022","DOIUrl":"https://doi.org/10.1299/jsmehs.2019.56.j022","url":null,"abstract":"","PeriodicalId":275370,"journal":{"name":"The Proceedings of Conference of Hokuriku-Shinetsu Branch","volume":"31 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123599530","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 : 1900-01-01DOI: 10.1299/jsmehs.2019.56.g034
K. Nakajima, Y. Hashizume
{"title":"Study on Resin Mold for Injection Molding Utilizing 3D printer (AM).","authors":"K. Nakajima, Y. Hashizume","doi":"10.1299/jsmehs.2019.56.g034","DOIUrl":"https://doi.org/10.1299/jsmehs.2019.56.g034","url":null,"abstract":"","PeriodicalId":275370,"journal":{"name":"The Proceedings of Conference of Hokuriku-Shinetsu Branch","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115256302","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 : 1900-01-01DOI: 10.1299/jsmehs.2019.56.a026
K. Hayashi, K. Kameyama
{"title":"Development of the stem-length measuring robot for the precision agriculture of the tomato","authors":"K. Hayashi, K. Kameyama","doi":"10.1299/jsmehs.2019.56.a026","DOIUrl":"https://doi.org/10.1299/jsmehs.2019.56.a026","url":null,"abstract":"","PeriodicalId":275370,"journal":{"name":"The Proceedings of Conference of Hokuriku-Shinetsu Branch","volume":"7 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1900-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115525396","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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