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Composite rubber arches with tunable energy dissipation 具有可调耗能的复合橡胶拱
Mechanical Engineering Journal Pub Date : 2025-01-01 DOI: 10.1299/mej.24-00480
Takumi NAGAISHI, Takuya MORIMOTO
{"title":"Composite rubber arches with tunable energy dissipation","authors":"Takumi NAGAISHI, Takuya MORIMOTO","doi":"10.1299/mej.24-00480","DOIUrl":"https://doi.org/10.1299/mej.24-00480","url":null,"abstract":"We propose a semi-circular composite rubber arch comprising two rubber materials with differing shear moduli as a novel unit cell structure for self-recovering, energy-dissipating metamaterials by adjusting the stiffness ratio and the boundary position between the materials that the arch achieves tunable stiffness distributions. Through a systematic finite element analysis, we identified four deformation modes: snapping, bending, and two distinct flattening modes. The snapping mode, characterized by load-displacement hysteresis, exhibited significant energy dissipation, while the flattening modes demonstrated stable, continuous deformation suitable for irreversible energy absorption. The programmable nature of energy dissipation was achieved over three orders of magnitude by modifying the stiffness distribution. Our results provide a foundation for designing composite arches with tailored mechanical properties. Arranging these unit cells in periodic configurations could serve as advanced mechanical metamaterials with enhanced energy absorption and application-specific deformation characteristics.","PeriodicalId":45233,"journal":{"name":"Mechanical Engineering Journal","volume":"12 1","pages":"24-00480"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.jstage.jst.go.jp/article/mej/12/1/12_24-00480/_pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147912086","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Unstable simultaneous whirl of two cylinders in a concentric double rotating cylinder system 同心双旋转气缸系统中两个气缸的不稳定同步旋转
Mechanical Engineering Journal Pub Date : 2025-01-01 DOI: 10.1299/mej.24-00332
Fumitaka Yoshizumi, Masanori IRITANI
{"title":"Unstable simultaneous whirl of two cylinders in a concentric double rotating cylinder system","authors":"Fumitaka Yoshizumi, Masanori IRITANI","doi":"10.1299/mej.24-00332","DOIUrl":"https://doi.org/10.1299/mej.24-00332","url":null,"abstract":"This study investigated the unstable simultaneous whirl of two cylinders in a concentric double rotating cylinder system, with both co- and counter-rotation. The axes of both cylinders were radially elastically supported independently of each other. A fixed (no rotation and no whirl) cylinder was installed outside the outer cylinder concentrically. The three cylinders were assumed to stay parallel to each other, making the gaps between them axially uniform. A theory to analyze the complex eigenvalues of the coupled system of gap flows and motions of cylinders was formulated. An experiment was carried out, in which structural conditions were set to be the same as possible for the inner and outer cylinders. A basic unstable mode was observed in which both cylinders whirled in the same direction and in opposite phases. In counter-rotation, the whirl direction transitioned from the rotation direction of the outer cylinder to that of the inner cylinder with increasing rotational speed of the inner cylinder. The transitions were brought about by replacement of the eigenmode with the minimum damping ratio. With the transition, the frequency changed discontinuously and the decrease in the damping ratio with increasing rotation speed became steep. Under simultaneous two-cylinder whirling, the stable area at combinations of the inner and outer cylinder rotation speeds became narrower than that of only the outer cylinder whirling.","PeriodicalId":45233,"journal":{"name":"Mechanical Engineering Journal","volume":"12 1","pages":"24-00332"},"PeriodicalIF":0.0,"publicationDate":"2025-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://www.jstage.jst.go.jp/article/mej/advpub/0/advpub_24-00332/_pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"147911197","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
引用次数: 0
Segment a cam contour with generalized cross product 用广义叉乘分割凸轮轮廓
IF 0.5
Mechanical Engineering Journal Pub Date : 2023-01-01 DOI: 10.1299/mej.22-00086
Jinwen Wei
{"title":"Segment a cam contour with generalized cross product","authors":"Jinwen Wei","doi":"10.1299/mej.22-00086","DOIUrl":"https://doi.org/10.1299/mej.22-00086","url":null,"abstract":"","PeriodicalId":45233,"journal":{"name":"Mechanical Engineering Journal","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66399391","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
A proposal for a personalized trustable guidance system for urban railways considering passenger behavior attributes 考虑乘客行为属性的城市轨道交通个性化可信赖引导系统研究
IF 0.5
Mechanical Engineering Journal Pub Date : 2023-01-01 DOI: 10.1299/mej.22-00310
So Ueno, W. Ohnishi, T. Koseki
{"title":"A proposal for a personalized trustable guidance system for urban railways considering passenger behavior attributes","authors":"So Ueno, W. Ohnishi, T. Koseki","doi":"10.1299/mej.22-00310","DOIUrl":"https://doi.org/10.1299/mej.22-00310","url":null,"abstract":"","PeriodicalId":45233,"journal":{"name":"Mechanical Engineering Journal","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66400351","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
Comparison of heat-transfer performance of a flat-plate pulsating heat pipe based on heating orientation and cross-sectional shape of the pipe 基于加热方向和管道截面形状的平板脉动热管传热性能比较
IF 0.5
Mechanical Engineering Journal Pub Date : 2023-01-01 DOI: 10.1299/mej.22-00415
Y. Yasuda, F. Nabeshima, K. Horiuchi, H. Nagai
{"title":"Comparison of heat-transfer performance of a flat-plate pulsating heat pipe based on heating orientation and cross-sectional shape of the pipe","authors":"Y. Yasuda, F. Nabeshima, K. Horiuchi, H. Nagai","doi":"10.1299/mej.22-00415","DOIUrl":"https://doi.org/10.1299/mej.22-00415","url":null,"abstract":"","PeriodicalId":45233,"journal":{"name":"Mechanical Engineering Journal","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66400789","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
Crack identification in beam-like structures using cuckoo optimization algorithm 基于布谷鸟优化算法的梁状结构裂纹识别
IF 0.5
Mechanical Engineering Journal Pub Date : 2023-01-01 DOI: 10.1299/mej.22-00449
Kazuma Takezawa, M. Arai
{"title":"Crack identification in beam-like structures using cuckoo optimization algorithm","authors":"Kazuma Takezawa, M. Arai","doi":"10.1299/mej.22-00449","DOIUrl":"https://doi.org/10.1299/mej.22-00449","url":null,"abstract":"","PeriodicalId":45233,"journal":{"name":"Mechanical Engineering Journal","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66400832","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
Design guidelines of surface texturing to improve lubrication characteristics under reciprocating motion 改善往复运动下润滑特性的表面纹理设计指南
IF 0.5
Mechanical Engineering Journal Pub Date : 2023-01-01 DOI: 10.1299/mej.23-00047
T. Matsumura, Toshikazu Fujino, Tatsuhiro Jibiki, K. Iwamoto, Masaki Oda
{"title":"Design guidelines of surface texturing to improve lubrication characteristics under reciprocating motion","authors":"T. Matsumura, Toshikazu Fujino, Tatsuhiro Jibiki, K. Iwamoto, Masaki Oda","doi":"10.1299/mej.23-00047","DOIUrl":"https://doi.org/10.1299/mej.23-00047","url":null,"abstract":"","PeriodicalId":45233,"journal":{"name":"Mechanical Engineering Journal","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66402017","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
Estimation of crack initiation and growth of hard coating by uniaxial tensile test and rotating cross-cylinders wear 用单轴拉伸试验和旋转交叉缸磨损估计硬质涂层裂纹萌生和扩展
IF 0.5
Mechanical Engineering Journal Pub Date : 2023-01-01 DOI: 10.1299/mej.23-00072
K. Asai, K. Kitamura, Chikara Matsuda, Takuma Ise
{"title":"Estimation of crack initiation and growth of hard coating by uniaxial tensile test and rotating cross-cylinders wear","authors":"K. Asai, K. Kitamura, Chikara Matsuda, Takuma Ise","doi":"10.1299/mej.23-00072","DOIUrl":"https://doi.org/10.1299/mej.23-00072","url":null,"abstract":"","PeriodicalId":45233,"journal":{"name":"Mechanical Engineering Journal","volume":"1 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66402808","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
Analysis of electricity prices for power supply toward a social optimum for installed wind and solar power utilization 对安装风能和太阳能发电的社会最优电力供应的电价分析
IF 0.5
Mechanical Engineering Journal Pub Date : 2023-01-01 DOI: 10.1299/mej.23-00084
Biness Lukwesa, S. Uemura, Yutaka Tabe
{"title":"Analysis of electricity prices for power supply toward a social optimum for installed wind and solar power utilization","authors":"Biness Lukwesa, S. Uemura, Yutaka Tabe","doi":"10.1299/mej.23-00084","DOIUrl":"https://doi.org/10.1299/mej.23-00084","url":null,"abstract":"","PeriodicalId":45233,"journal":{"name":"Mechanical Engineering Journal","volume":"41 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66403375","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
Evaluation of mechanical and antibacterial properties of Cu-DLC composite films Cu-DLC复合薄膜的力学性能和抗菌性能评价
IF 0.5
Mechanical Engineering Journal Pub Date : 2023-01-01 DOI: 10.1299/mej.23-00088
Yucheng Li, Chiaki Koga, Y. Hirata, H. Akasaka, H. Kanetaka, N. Ohtake
{"title":"Evaluation of mechanical and antibacterial properties of Cu-DLC composite films","authors":"Yucheng Li, Chiaki Koga, Y. Hirata, H. Akasaka, H. Kanetaka, N. Ohtake","doi":"10.1299/mej.23-00088","DOIUrl":"https://doi.org/10.1299/mej.23-00088","url":null,"abstract":"","PeriodicalId":45233,"journal":{"name":"Mechanical Engineering Journal","volume":"267 1","pages":""},"PeriodicalIF":0.5,"publicationDate":"2023-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"66403460","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
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