The conventional ultrasonic inspection is a detection of the reflected ultrasonic pulse from the abnormal point in an inspected object. However, an indistinct abnormality does not reflect the ultrasound. The conventional ultrasonic inspection is in unavailable to detect it. In this study, the authors propose to use an instantaneous frequency of the ultrasonic pulse. The instantaneous frequency can show the significant difference in a frequency of the ultrasonic pulse passing through the indistinct abnormality because the instantaneous frequency can express the frequency variation in detail. It is difficult for the usual Fourier transform to catch a very small change in ultrasonic frequency because of limitation of a frequency resolution. A feasibility of the proposed method is demonstrated through a simple experiment.
{"title":"Estimation of inner state using instantaneous frequency of ultrasonic wave","authors":"Takahiro Nakano, Takumi Inoue","doi":"10.11345/NCTAM.60.135","DOIUrl":"https://doi.org/10.11345/NCTAM.60.135","url":null,"abstract":"The conventional ultrasonic inspection is a detection of the reflected ultrasonic pulse from the abnormal point in an inspected object. However, an indistinct abnormality does not reflect the ultrasound. The conventional ultrasonic inspection is in unavailable to detect it. In this study, the authors propose to use an instantaneous frequency of the ultrasonic pulse. The instantaneous frequency can show the significant difference in a frequency of the ultrasonic pulse passing through the indistinct abnormality because the instantaneous frequency can express the frequency variation in detail. It is difficult for the usual Fourier transform to catch a very small change in ultrasonic frequency because of limitation of a frequency resolution. A feasibility of the proposed method is demonstrated through a simple experiment.","PeriodicalId":330369,"journal":{"name":"Theoretical and applied mechanics Japan","volume":"61 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126757636","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}
H. Kanayama, M. Ogino, S. Sugimoto, Qinghe Yao, E. Komalasari
{"title":"A Preconditioner Construction for Domain Decomposition Method of Large Scale 3D Magnetostatic Problems","authors":"H. Kanayama, M. Ogino, S. Sugimoto, Qinghe Yao, E. Komalasari","doi":"10.11345/NCTAM.60.381","DOIUrl":"https://doi.org/10.11345/NCTAM.60.381","url":null,"abstract":"","PeriodicalId":330369,"journal":{"name":"Theoretical and applied mechanics Japan","volume":"5 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116815091","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":"A Coupling Analysis of Thermal Convection Problems Based on a Characteristic Curve Method","authors":"Qinghe Yao, H. Kanayama","doi":"10.11345/NCTAM.59.257","DOIUrl":"https://doi.org/10.11345/NCTAM.59.257","url":null,"abstract":"","PeriodicalId":330369,"journal":{"name":"Theoretical and applied mechanics Japan","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134591337","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":"Estimation of Small Unmanned Aerial Vehicle Stability Derivatives Using a Novel System Identification Method","authors":"M. Naruoka, T. Tsuchiya","doi":"10.11345/NCTAM.59.123","DOIUrl":"https://doi.org/10.11345/NCTAM.59.123","url":null,"abstract":"","PeriodicalId":330369,"journal":{"name":"Theoretical and applied mechanics Japan","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125831160","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":"A Potential Strength and Ultimate Behavior of Framed Structures Considering Catenary Effects after Failure Mechanism Formation Subjected to Vertical Load","authors":"Takumi Ito, T. Fukuyama","doi":"10.11345/NCTAM.59.29","DOIUrl":"https://doi.org/10.11345/NCTAM.59.29","url":null,"abstract":"","PeriodicalId":330369,"journal":{"name":"Theoretical and applied mechanics Japan","volume":"12 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133655278","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}
An analysis of dynamic behavior is carried out in a thick-walled elastic-plastic-viscoplastic sphere. First, formulas are derived of propagation speeds of elastic-plastic-viscoplastic spherical waves. Second, the theoretical formula is analytically proved to be strain rate and stress rate dependent. Third, ordinary differential equations among physical quantities are derived along characteristic curves. Fourth, calculated examples are shown on the basis of the elastic-plastic-viscoplastic theory. Last, a comparison is also done of calculated results based on the elastic-plastic-viscoplastic theory with those based on the elastic-plastic theory.
{"title":"An Analysis of Propagation of Spherical Waves in an Elastic-Plastic-Viscoplastic Body","authors":"N. Tanimoto","doi":"10.11345/NCTAM.59.67","DOIUrl":"https://doi.org/10.11345/NCTAM.59.67","url":null,"abstract":"An analysis of dynamic behavior is carried out in a thick-walled elastic-plastic-viscoplastic sphere. First, formulas are derived of propagation speeds of elastic-plastic-viscoplastic spherical waves. Second, the theoretical formula is analytically proved to be strain rate and stress rate dependent. Third, ordinary differential equations among physical quantities are derived along characteristic curves. Fourth, calculated examples are shown on the basis of the elastic-plastic-viscoplastic theory. Last, a comparison is also done of calculated results based on the elastic-plastic-viscoplastic theory with those based on the elastic-plastic theory.","PeriodicalId":330369,"journal":{"name":"Theoretical and applied mechanics Japan","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116254445","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":"Approximated Solutions of Schrödinger Equations Induced from Nearly Monochromatic Waves","authors":"S. Kanagawa, T. Nitta, K. Tchizawa","doi":"10.11345/NCTAM.59.153","DOIUrl":"https://doi.org/10.11345/NCTAM.59.153","url":null,"abstract":"","PeriodicalId":330369,"journal":{"name":"Theoretical and applied mechanics Japan","volume":"22 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123749327","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}
I. Funaki, Y. Kajimura, M. Nakano, I. Shinohara, T. Hyakutake, T. Miyasaka, Y. Nakayama, H. Kuninaka
{"title":"Research and Development of an Ion Engine Grid Design Tool","authors":"I. Funaki, Y. Kajimura, M. Nakano, I. Shinohara, T. Hyakutake, T. Miyasaka, Y. Nakayama, H. Kuninaka","doi":"10.11345/NCTAM.59.49","DOIUrl":"https://doi.org/10.11345/NCTAM.59.49","url":null,"abstract":"","PeriodicalId":330369,"journal":{"name":"Theoretical and applied mechanics Japan","volume":"39 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120962901","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":"Influence of Setae of Earthworm-like Robot on Peristaltic Propulsion","authors":"M. Yokoyama, S. Yamakawa, O. Mochizuki","doi":"10.11345/NCTAM.59.143","DOIUrl":"https://doi.org/10.11345/NCTAM.59.143","url":null,"abstract":"","PeriodicalId":330369,"journal":{"name":"Theoretical and applied mechanics Japan","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125325535","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":"A Settlement Analysis of an Embankment Using the Modified MMX-MODEL","authors":"H. Kadota, T. Kusaka, Akitoshi Mochizuki","doi":"10.11345/NCTAM.59.39","DOIUrl":"https://doi.org/10.11345/NCTAM.59.39","url":null,"abstract":"","PeriodicalId":330369,"journal":{"name":"Theoretical and applied mechanics Japan","volume":"49 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2011-02-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127759593","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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