Theoretical and Applied Mechanics Letters最新文献_第6页

Effects of mean shear on the vortex identification and the orientation statistics 平均切变对涡旋识别和方向统计的影响

IF 3.4 3区工程技术

Theoretical and Applied Mechanics Letters Pub Date : 2023-07-01 DOI: 10.1016/j.taml.2023.100454

Tianyi Bai , Cheng Cheng , Lin Fu

引用次数: 1

A reconfigurable dynamic Bayesian network for digital twin modeling of structures with multiple damage modes 可重构动态贝叶斯网络用于多损伤模式结构的数字孪生建模

IF 3.4 3区工程技术

Theoretical and Applied Mechanics Letters Pub Date : 2023-07-01 DOI: 10.1016/j.taml.2023.100440

Yumei Ye , Qiang Yang , Jingang Zhang , Songhe Meng , Jun Wang , Xia Tang

{"title":"A reconfigurable dynamic Bayesian network for digital twin modeling of structures with multiple damage modes","authors":"Yumei Ye , Qiang Yang , Jingang Zhang , Songhe Meng , Jun Wang , Xia Tang","doi":"10.1016/j.taml.2023.100440","DOIUrl":"10.1016/j.taml.2023.100440","url":null,"abstract":"<div><p>Dynamic Bayesian networks (DBNs) are commonly employed for structural digital twin modeling. At present, most researches only consider single damage mode tracking. It is not sufficient for a reusable spacecraft as various damage modes may occur during its service life. A reconfigurable DBN method is proposed in this paper. The structure of the DBN can be updated dynamically to describe the interactions between different damages. Two common damages (fatigue and bolt loosening) for a spacecraft structure are considered in a numerical example. The results show that the reconfigurable DBN can accurately predict the acceleration phenomenon of crack growth caused by bolt loosening while the DBN with time-invariant structure cannot, even with enough updates. The definition of interaction coefficients makes the reconfigurable DBN easy to track multiple damages and be extended to more complex problems. The method also has a good physical interpretability as the reconfiguration of DBN corresponds to a specific mechanism. Satisfactory predictions do not require precise knowledge of reconfiguration conditions, making the method more practical.</p></div>","PeriodicalId":46902,"journal":{"name":"Theoretical and Applied Mechanics Letters","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2023-07-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42572005","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Advance on stochastic dynamics/nonlinear and stochastic dynamics 随机动力学/非线性和随机动力学研究进展

IF 3.4 3区工程技术

Theoretical and Applied Mechanics Letters Pub Date : 2023-07-01 DOI: 10.1016/j.taml.2023.100457

Yong Xu, Yongge Li, Stefano Lenci

引用次数: 0

Improving energy storage by PCM using hybrid nanofluid [(SWCNTs-CuO)/H2O] and a helical (spiral) coil: Hybrid passive techniques 使用混合纳米流体[（SWCNTs-CuO）/H2O]和螺旋（螺旋）线圈通过PCM改善储能：混合无源技术

IF 3.4 3区工程技术

Theoretical and Applied Mechanics Letters Pub Date : 2023-07-01 DOI: 10.1016/j.taml.2023.100458

Aliakbar Hosseinpour , Mohsen Pourfallah , Mosayeb Gholinia

引用次数: 1

Simulation of anchor chain based on lumped mass method 基于集中质量法的锚链仿真

IF 3.4 3区工程技术

Theoretical and Applied Mechanics Letters Pub Date : 2023-07-01 DOI: 10.1016/j.taml.2023.100460

Xiaobin Jiang, Jian Gan, Shiyang Teng

引用次数: 1

Effect of wall friction on oscillation of velocity at the head of the gravity current 壁面摩擦对重力流头部速度振荡的影响

IF 3.4 3区工程技术

Theoretical and Applied Mechanics Letters Pub Date : 2023-05-01 DOI: 10.1016/j.taml.2023.100439

Jinichi Koue

{"title":"Effect of wall friction on oscillation of velocity at the head of the gravity current","authors":"Jinichi Koue","doi":"10.1016/j.taml.2023.100439","DOIUrl":"10.1016/j.taml.2023.100439","url":null,"abstract":"<div><p>Velocity oscillations at the head of the gravity current were investigated in experiments and numerical simulations of a locked-exchange flow. A comparison of the experimental and numerical simulations showed that the depth and volume of the released fluid affected the oscillations in the velocity of the gravity current. At the initial stage, the head moved forward at a constant velocity, and velocity oscillations occurred. The head maximum thickness increased at the same time as the head, which did not have a round, and accumulated buoyant fluid due to the buoyancy effect intrusion force. The period of accumulation and release of the buoyant fluid was almost the same as that observed for the head movement velocity; the head movement velocity was faster when the buoyant fluid accumulated and slower when it was released. At the viscous stage, the forward velocity decreased proportionally to the power of 1/2 of time, since the head was not disturbed from behind. As the mass concentration at the head decreased, the gravity current was slowed by the viscous stage in its effect. At the viscous stage, the mass concentration at the head was no longer present, and the velocity oscillations also decreased.</p></div>","PeriodicalId":46902,"journal":{"name":"Theoretical and Applied Mechanics Letters","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46289436","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Aerodynamic shape and drag scaling law of a flexible fibre in a flowing medium 柔性纤维在流动介质中的气动外形及阻力标度规律

IF 3.4 3区工程技术

Theoretical and Applied Mechanics Letters Pub Date : 2023-05-01 DOI: 10.1016/j.taml.2022.100397

Bo-Hua Sun, Xiao-Lin Guo

引用次数: 1

Sound absorbing properties of spiral metasurfaces inspired by micro-perforated plates 微孔板激励下螺旋超表面的吸声特性

IF 3.4 3区工程技术

Theoretical and Applied Mechanics Letters Pub Date : 2023-05-01 DOI: 10.1016/j.taml.2023.100437

Han Zhang , Pengxiang Hao , Huilan Wu , Zhenyuan Lin , Chengpeng Hao , Zhengpan Qi , Ning Hu

引用次数: 0

Interactions between a central bubble and a surrounding bubble cluster 中心气泡和周围气泡团之间的相互作用

IF 3.4 3区工程技术

Theoretical and Applied Mechanics Letters Pub Date : 2023-05-01 DOI: 10.1016/j.taml.2023.100438

A-Man Zhang , Shi-Min Li , Pu Cui , Shuai Li , Yun-Long Liu

引用次数: 6

Computer simulation of Cu: AlOOH/water in a microchannel heat sink using a porous media technique and solved by numerical analysis AGM and FEM 利用多孔介质技术对微通道散热器中Cu:ALOOH/水的计算机模拟，并通过数值分析AGM和FEM求解

IF 3.4 3区工程技术

Theoretical and Applied Mechanics Letters Pub Date : 2023-05-01 DOI: 10.1016/j.taml.2023.100432

S.A. Abdollahi , P. Jalili , B. Jalili , H. Nourozpour , Y. Safari , P. Pasha , D.D. Ganji

{"title":"Computer simulation of Cu: AlOOH/water in a microchannel heat sink using a porous media technique and solved by numerical analysis AGM and FEM","authors":"S.A. Abdollahi , P. Jalili , B. Jalili , H. Nourozpour , Y. Safari , P. Pasha , D.D. Ganji","doi":"10.1016/j.taml.2023.100432","DOIUrl":"10.1016/j.taml.2023.100432","url":null,"abstract":"<div><p>Extensive improvements in small-scale thermal systems in electronic circuits, automotive industries, and microcomputers conduct the study of microsystems as essential. Flow and thermic field characteristics of the coherent nanofluid-guided microchannel heat sink are described in this perusal. The porous media approximate was used to search the heat distribution in the expanded sheet and Cu: γ - AlOOH/water. A hybrid blend of Boehme copper and aluminum nanoparticles is evaluated to have a cooling effect on the microchannel heat sink. By using Akbari Ganji and finite element methods, linear and non-linear differential equations as well as simple dimensionless equations have been analyzed. The purpose of this study is to investigate the fluid and thermal parameters of copper hybrid solution added to water, such as Nusselt number and Darcy number so that we can reach the best cooling of the fluid. Also, by installing a piece of fin on the wall of the heat sink, the coefficient of conductive heat transfer and displacement heat transfer with the surrounding air fluid increases, and the efficiency of the system increases. The overall results show that expanding values on the NP (series heat transfer fluid system maximizes performance with temperatures) volume division of copper, as well as boehmite alumina particles, lead to a decrease within the stream velocity of the Cu: AlOOH/water. Increasing the volume fraction of nanoparticles in the hybrid mixture decreases the temperature of the solid surface and the hybrid nanofluid. The Brownian movement improves as the volume percentage of nanoparticles in the hybrid mixture grows, spreading the heat across the environment. As a result, heat transmission rates rise. As the Darcy number increases, the thermal field for solid sections and Cu: AlOOH/water improves.</p></div>","PeriodicalId":46902,"journal":{"name":"Theoretical and Applied Mechanics Letters","volume":null,"pages":null},"PeriodicalIF":3.4,"publicationDate":"2023-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49413285","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 21