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Journal of the Japanese Society for Experimental Mechanics最新文献

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Eye Features Extraction Based on Eye Color Interpretation in Eigenspace and Eye Structure Representation in Logarithmic-Polar Domain 基于特征空间眼睛颜色解释和对数极域眼睛结构表示的眼睛特征提取
Journal of the Japanese Society for Experimental Mechanics Pub Date : 2014-07-01 DOI: 10.11395/JJSEM.14.S264
Mohammad Aldibaja, Shinici Suzuki
{"title":"Eye Features Extraction Based on Eye Color Interpretation in Eigenspace and Eye Structure Representation in Logarithmic-Polar Domain","authors":"Mohammad Aldibaja, Shinici Suzuki","doi":"10.11395/JJSEM.14.S264","DOIUrl":"https://doi.org/10.11395/JJSEM.14.S264","url":null,"abstract":"This paper presents a robust method for eye shape detection. Existence of eye components such as pupil, iris, eyelid and sclera makes the color variation between the eye and skin very sharp. This variation is measured by applying Principal Component Analysis (PCA) on RGB color channels of an eye image. In addition, eyes have an elliptical structure which can easily be detected in Logpolar domain. Log-polar transform (LPT) decomposes the eye into two parabolas along axis. Thus, the eye shape can be detected by searching on corresponding coordinates along log r axis. Based on these properties of eye representation by PCA and LPT, the eye shape is extracted regardless the change of scale, rotation and lighting conditions. The results show high accuracy with reducing time consumption compared to the other existing methods.","PeriodicalId":282024,"journal":{"name":"Journal of the Japanese Society for Experimental Mechanics","volume":"104 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121721582","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}
引用次数: 3
Vortex Shedding from a Pitch-Oscillating Discoid Airfoil 俯仰振荡盘状翼型的旋涡脱落
Journal of the Japanese Society for Experimental Mechanics Pub Date : 2014-07-01 DOI: 10.11395/JJSEM.14.S71
T. Haniu, H. Hasegawa, K. Nakagawa
{"title":"Vortex Shedding from a Pitch-Oscillating Discoid Airfoil","authors":"T. Haniu, H. Hasegawa, K. Nakagawa","doi":"10.11395/JJSEM.14.S71","DOIUrl":"https://doi.org/10.11395/JJSEM.14.S71","url":null,"abstract":"Flying and aquatic animals release a vortex by pitching a wing or a fin. The behavior of this vortex affects unsteady fluid forces, and the propulsive force of these animals relates to unsteady forces accompanied with the movement of vortices. It is well known that vortex motion plays an important role in the generation of unsteady fluid force and enhancement of the force. In general, the force associated with unsteady flow is greater than that of steady flow. Accordingly, conventional quasi-steady theory cannot give the correct assessment of the generating mechanism of the propulsive force. In the present study, generation of the propulsive force in swimming is investigated. The vortex structure and its behavior owing to flow around a discoid airfoil simulating a swimmer’s hand are investigated during pitch-oscillating motion. In particular, wind tunnel tests were conducted to investigate the relationship between three-dimensional vortex structure and unsteady fluid forces acting on a discoid airfoil. The vortical flow fields were measured using a scanning particle image velocimetry technique. Under stationary conditions, the vortex ring is successively shed downstream, and the vortex ring inclines as the angle of attack α of the airfoil changes. On the contrary, vortex growth is observed during pitch-oscillating motion, and a large scale vortex is released into the wake close to the airfoil.","PeriodicalId":282024,"journal":{"name":"Journal of the Japanese Society for Experimental Mechanics","volume":"28 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115214765","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}
引用次数: 0
Measurement of Wall Shear Stress Fluctuation with the Micro-fabricated Hot-film Sensor in a Boundary Layer of a Wall Jet 用微加工热膜传感器测量壁面射流边界层的剪切应力波动
Journal of the Japanese Society for Experimental Mechanics Pub Date : 2014-07-01 DOI: 10.11395/JJSEM.14.S13
T. Sawada, O. Terashima, Y. Sakai, K. Nagata, M. Shikida, Yasumasa Ito
{"title":"Measurement of Wall Shear Stress Fluctuation with the Micro-fabricated Hot-film Sensor in a Boundary Layer of a Wall Jet","authors":"T. Sawada, O. Terashima, Y. Sakai, K. Nagata, M. Shikida, Yasumasa Ito","doi":"10.11395/JJSEM.14.S13","DOIUrl":"https://doi.org/10.11395/JJSEM.14.S13","url":null,"abstract":"In this study, we developed a hot-film sensor to measure the wall shear stress fluctuation in turbulent flows. The heated element of the sensor, which acts as a sensing part is 10 μm wide and is folded back twice for increasing its electrical resistance to produce heat. In addition, the substrate of the sensor is made up of silicon wafer of 1 μm thickness for increasing the sensor’s temporal resolution, in consideration of the substrate’s heating capacity. Further, the static/dynamic response test and the measurement of the wall shear stress fluctuation in the boundary layer of the wall jet are performed. The results show that the newly developed hot-film sensor responds to the wall shear stress properly and that its roll-off frequency is 1 kHz. In addition, it is found that the power spectrum of the wall shear stress fluctuation has several peaks. However, no distinct peaks are found in that of the streamwise velocity fluctuation near the wall. This implies that the wall shear stress fluctuation is influenced more by the specified flow structure, such as the coherent vortex structure which arises with a constant frequency in a turbulent boundary layer.","PeriodicalId":282024,"journal":{"name":"Journal of the Japanese Society for Experimental Mechanics","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123475411","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}
引用次数: 1
Liquid and Powder Motion in Packed Bed 填料床中的液体和粉末运动
Journal of the Japanese Society for Experimental Mechanics Pub Date : 2014-07-01 DOI: 10.11395/JJSEM.14.S237
T. Kon, S. Kikuchi, S. Ueda,, R. Inoue
{"title":"Liquid and Powder Motion in Packed Bed","authors":"T. Kon, S. Kikuchi, S. Ueda,, R. Inoue","doi":"10.11395/JJSEM.14.S237","DOIUrl":"https://doi.org/10.11395/JJSEM.14.S237","url":null,"abstract":"","PeriodicalId":282024,"journal":{"name":"Journal of the Japanese Society for Experimental Mechanics","volume":"14 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130215507","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}
引用次数: 0
An Approach to Wide Range Strain Measurement by Bi-sensitive Speckle Interferometry and Digital Image Correlation 双灵敏散斑干涉和数字图像相关的宽范围应变测量方法
Journal of the Japanese Society for Experimental Mechanics Pub Date : 2014-07-01 DOI: 10.11395/JJSEM.14.S171
S. Arikawa, Yoichi Senso, S. Yoneyama
{"title":"An Approach to Wide Range Strain Measurement by Bi-sensitive Speckle Interferometry and Digital Image Correlation","authors":"S. Arikawa, Yoichi Senso, S. Yoneyama","doi":"10.11395/JJSEM.14.S171","DOIUrl":"https://doi.org/10.11395/JJSEM.14.S171","url":null,"abstract":"","PeriodicalId":282024,"journal":{"name":"Journal of the Japanese Society for Experimental Mechanics","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130786458","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}
引用次数: 0
Development of Test Methods for Mechanical Property Evaluation of Balloon-Expandable CoCr Alloy Stent 球囊可膨胀CoCr合金支架力学性能评价试验方法的研究
Journal of the Japanese Society for Experimental Mechanics Pub Date : 2014-07-01 DOI: 10.11395/JJSEM.14.S285
Takuya Yokoo, I. Shimizu, A. Wada, A. Takaki, S. Okada, Mamoru Hatakeyama, S. Yamashita
{"title":"Development of Test Methods for Mechanical Property Evaluation of Balloon-Expandable CoCr Alloy Stent","authors":"Takuya Yokoo, I. Shimizu, A. Wada, A. Takaki, S. Okada, Mamoru Hatakeyama, S. Yamashita","doi":"10.11395/JJSEM.14.S285","DOIUrl":"https://doi.org/10.11395/JJSEM.14.S285","url":null,"abstract":"The present study aims to establish comprehensive test methods to evaluate the mechanical properties of the intravascular coronary stent with a closed cell design. We focused on three important mechanical properties required to the stent, bending flexibility, radial strength, and longitudinal strength. Test apparatuses and testing procedures were then developed for precise evaluation of those properties. It was found that the developed test apparatuses and testing methods successfully evaluated the mechanical properties of the stent. The results revealed that the mechanical properties were strongly influenced by the structure of the stent, that is, combination of the cell strut and the link strut.","PeriodicalId":282024,"journal":{"name":"Journal of the Japanese Society for Experimental Mechanics","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"117041241","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}
引用次数: 2
J -integral Evaluation for an Interface Crack Using Digital Image Correlation 基于数字图像相关的界面裂纹J积分评价
Journal of the Japanese Society for Experimental Mechanics Pub Date : 2014-07-01 DOI: 10.11395/JJSEM.14.S122
Hiroto Yamane, S. Arikawa, S. Yoneyama, Y. Watanabe, T. Asai, Kunio Shiokawa, M. Yamashita
{"title":"J -integral Evaluation for an Interface Crack Using Digital Image Correlation","authors":"Hiroto Yamane, S. Arikawa, S. Yoneyama, Y. Watanabe, T. Asai, Kunio Shiokawa, M. Yamashita","doi":"10.11395/JJSEM.14.S122","DOIUrl":"https://doi.org/10.11395/JJSEM.14.S122","url":null,"abstract":"","PeriodicalId":282024,"journal":{"name":"Journal of the Japanese Society for Experimental Mechanics","volume":"77 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"116341339","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}
引用次数: 2
Influence of Cell Filling Pattern and Position on Dynamic In-plane Compression Properties of Aluminum Honeycombs 蜂窝填充方式和位置对铝蜂窝动态面内压缩性能的影响
Journal of the Japanese Society for Experimental Mechanics Pub Date : 2014-07-01 DOI: 10.11395/JJSEM.14.S182
M. Nishida, K. Teranishi, S. Otani
{"title":"Influence of Cell Filling Pattern and Position on Dynamic In-plane Compression Properties of Aluminum Honeycombs","authors":"M. Nishida, K. Teranishi, S. Otani","doi":"10.11395/JJSEM.14.S182","DOIUrl":"https://doi.org/10.11395/JJSEM.14.S182","url":null,"abstract":"","PeriodicalId":282024,"journal":{"name":"Journal of the Japanese Society for Experimental Mechanics","volume":"8 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127448760","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}
引用次数: 0
Prediction Method of Fracture Strain for Non-Standardized Specimens Based on Local Absorbed Strain Energy Distribution 基于局部吸收应变能分布的非标准化试样断裂应变预测方法
Journal of the Japanese Society for Experimental Mechanics Pub Date : 2014-07-01 DOI: 10.11395/JJSEM.14.S210
Tadao Fukuta, K. Obunai, K. Ozaki, Masato Tsutsui, Takuto Hara
{"title":"Prediction Method of Fracture Strain for Non-Standardized Specimens Based on Local Absorbed Strain Energy Distribution","authors":"Tadao Fukuta, K. Obunai, K. Ozaki, Masato Tsutsui, Takuto Hara","doi":"10.11395/JJSEM.14.S210","DOIUrl":"https://doi.org/10.11395/JJSEM.14.S210","url":null,"abstract":"In tensile testing, non-standardized specimens are sometimes used to investigate the tensile characteristics. In this study, an effective method for investigating the tensile characteristics of such non-standardized specimens has been proposed. Two types of specimens made from ductile materials—standardized and non-standardized—were prepared and subjected to uniaxial tensile loads. The test results showed that there was a significant difference in the fracture strain when the non-standardized specimen was used. To evaluate the fracture strain, a new method that considered the absorbed strain energy distribution in the gauge section was proposed. Further, the validity of the proposed method was demonstrated by making comparisons with experimental results.","PeriodicalId":282024,"journal":{"name":"Journal of the Japanese Society for Experimental Mechanics","volume":"79 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126175612","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}
引用次数: 2
Flame Propagation and Fractal Dimension in a Concentric Double Cylinders Apparatus 同心双圆柱形装置中火焰传播与分形维数
Journal of the Japanese Society for Experimental Mechanics Pub Date : 2014-07-01 DOI: 10.11395/JJSEM.14.S101
Y. Noguchi, Keizo Nakamura, Y. Hagiwara, S. Hitomi, K. Kuwana
{"title":"Flame Propagation and Fractal Dimension in a Concentric Double Cylinders Apparatus","authors":"Y. Noguchi, Keizo Nakamura, Y. Hagiwara, S. Hitomi, K. Kuwana","doi":"10.11395/JJSEM.14.S101","DOIUrl":"https://doi.org/10.11395/JJSEM.14.S101","url":null,"abstract":"The aim of this study is to estimate the flame fractal dimensions of methane/air mixtures by experimentally measuring the apparent flame-propagation velocities. In this study, we used an apparatus consisting of two concentric cylinders. It was found that the larger the cylinder size, i.e. the flame scale, is, (i) the more the number of wrinkles of flame is, (ii) the faster the apparent flame-propagation velocity is, and (iii) the values of flame fractal dimension are varied from 1.3 to 2.0. It was also found that the fractal dimension increases with a decrease in equivalence ratio, which is likely because of the effect of preferential diffusion and/or the change in the Lewis number.","PeriodicalId":282024,"journal":{"name":"Journal of the Japanese Society for Experimental Mechanics","volume":"57 ","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2014-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131693321","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}
引用次数: 1
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