Mechanical Engineering Journal最新文献_第4页

Numerical studies for defect topology identification based on the adjoint variable and the finite element methods 基于伴随变量法和有限元法的缺陷拓扑识别数值研究

IF 0.5

Mechanical Engineering Journal Pub Date : 2023-01-01 DOI: 10.1299/mej.23-00090

T. Kurahashi, K. Takeuchi, Towa Koike, M. Kishida, Y. Murakami, F. Ikeda

引用次数: 0

Markerless motion capture of hands and fingers in high-speed throwing task and its accuracy verification 高速投掷动作中手和手指的无标记动作捕捉及其准确性验证

Mechanical Engineering Journal Pub Date : 2023-01-01 DOI: 10.1299/mej.23-00220

Ayane KUSAFUKA, Naoki TSUKAMOTO, Kohei MIYATA, Kazutoshi KUDO

{"title":"Markerless motion capture of hands and fingers in high-speed throwing task and its accuracy verification","authors":"Ayane KUSAFUKA, Naoki TSUKAMOTO, Kohei MIYATA, Kazutoshi KUDO","doi":"10.1299/mej.23-00220","DOIUrl":"https://doi.org/10.1299/mej.23-00220","url":null,"abstract":"In human motion capture systems, reflective markers attached to the body have been widely used to track motion using optical cameras. However, when the speed of motion increases, because the brightness and angle of view of the camera are limited, and the markers often fall off, particularly of detailed body parts such as fingers in full-body movements, other parts of the body (palms) have been investigated. This study attempted to acquire finger movements during a high-speed throwing task without attaching markers using automatic image recognition technology based on deep learning (DeepLabCut) and verified its accuracy compared to conventional methods. As a result, the absolute distance between the 3D coordinates obtained from the two motion capture systems was an average of 15.5 to 29.4 mm depending on tracked points, and the correlation coefficients between them ranged from 0.932 to 0.999. Therefore, the shapes of the time-series profiles of the 3D coordinates obtained from the two motion- capture systems were similar. These results suggest that motion measurement using markerless motion capture is possible in environments where conventional motion capture systems are difficult to use.","PeriodicalId":45233,"journal":{"name":"Mechanical Engineering Journal","volume":"1 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":"135705468","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

Visualization and analysis of skin strain distribution in various human facial actions 各种面部动作中皮肤应变分布的可视化与分析

Mechanical Engineering Journal Pub Date : 2023-01-01 DOI: 10.1299/mej.23-00189

Takeru MISU, Hisashi ISHIHARA, So NAGASHIMA, Yusuke DOI, Akihiro NAKATANI

{"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}

引用次数: 0

Simulation-based estimation of wheel/rail friction coefficient and wear number considering results of full-scale roller-rig test 基于全尺寸滚轮试验结果的轮轨摩擦系数和磨损数仿真估算

IF 0.5

Mechanical Engineering Journal Pub Date : 2023-01-01 DOI: 10.1299/mej.22-00299

Yosuke Ichiyanagi, Y. Michitsuji, A. Matsumoto, Yasuhiro Sato, H. Ohno, S. Ogata, M. Tanimoto, T. Fukushima, Takuya Matsuda, D. Shinagawa

引用次数: 0

Application of a first-order method to estimate the failure probability of component subjected to thermal transients for optimization of design parameters 应用一阶方法估计受热瞬变影响的构件失效概率，以优化设计参数

IF 0.5

Mechanical Engineering Journal Pub Date : 2023-01-01 DOI: 10.1299/mej.23-00042

S. Okajima, Takero Mori, N. Kikuchi, Masaaki Tanaka, M. Miyazaki

引用次数: 0

Effect of temperature conditions of a heated plate on the crystallization of CFRTP 加热板温度条件对CFRTP结晶的影响

IF 0.5

Mechanical Engineering Journal Pub Date : 2023-01-01 DOI: 10.1299/mej.23-00049

Yasuhiro Tasaka, R. Matsuzaki

引用次数: 0

Effect of the plasticity of pipe and support on the seismic response of piping systems 管道及支座塑性对管道系统地震反应的影响

IF 0.5

Mechanical Engineering Journal Pub Date : 2023-01-01 DOI: 10.1299/mej.23-00075

T. Okuda, Hideki Takahashi, Tomoyoshi Watakabe

引用次数: 0

Diamagnetic suspension with variable compliance for force sensing devices 具有可变顺应力传感装置的抗磁性悬架

IF 0.5

Mechanical Engineering Journal Pub Date : 2023-01-01 DOI: 10.1299/mej.23-00126

Kazuhiro Katayama, M. Kageshima

引用次数: 0

Non-destructive estimation of three-dimensional inelastic strain via nonlinear inverse analysis using displacement 基于位移非线性逆分析的三维非弹性应变无损估计

IF 0.5

Mechanical Engineering Journal Pub Date : 2023-01-01 DOI: 10.1299/mej.23-00191

Satoshi Fujii, M. Ogawa, Dai Hirabayashi

引用次数: 0

Basic study on transmission error for gear made from different metals laminated in width direction to provide rigidity distribution 不同金属在宽度方向层合以提供刚度分布的齿轮传动误差的基础研究

Mechanical Engineering Journal Pub Date : 2023-01-01 DOI: 10.1299/mej.23-00163

Fumitaka YOSHIZUMI, Takayuki AOYAMA, Yoshikatsu SHIBATA

{"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}

引用次数: 0