Meccanica最新文献_第2页

Innovation in mechanics of masonry: theoretical and computational modelling 砌体力学的创新：理论和计算模型

IF 2.1 3区工程技术

Meccanica Pub Date : 2025-08-06 DOI: 10.1007/s11012-025-02039-6

Daniela Addessi

引用次数: 0

A theoretical model of time-varying meshing stiffness for a spur-face gear drive according to its localized characteristics during point-contact 根据直齿面齿轮传动点接触局部化特性，建立了直齿面齿轮传动时变啮合刚度的理论模型

IF 2.1 3区工程技术

Meccanica Pub Date : 2025-08-05 DOI: 10.1007/s11012-025-02033-y

Bo Xu, Lingyun Zhu, Xiangfeng Gou, Qingfu Guo, Guoguang Jin, Chang Liu, Dong Liang, Xinhao Zhao, Guoliang Liu

{"title":"A theoretical model of time-varying meshing stiffness for a spur-face gear drive according to its localized characteristics during point-contact","authors":"Bo Xu, Lingyun Zhu, Xiangfeng Gou, Qingfu Guo, Guoguang Jin, Chang Liu, Dong Liang, Xinhao Zhao, Guoliang Liu","doi":"10.1007/s11012-025-02033-y","DOIUrl":"10.1007/s11012-025-02033-y","url":null,"abstract":"<div><p>The contact region is actually an ellipse during point-contact, as stated by Hertzian contact theory. The load in the contact ellipse (CE) gradually decays rather than uniformly distributes due to the varying curvature of contact surfaces. Spur-face gear drive (SFGD) is highly valued in modern machines due to its point-contact characteristics. An improved theoretical model of time-varying mesh stiffness (TVMS) for SFGD has been constructed by coupling tooth, contact and fillet-foundation stiffness. A novel thought named deformation suppression which there is a fixed effect on the CE by the area outside the CE due to the absence of force is proposed according to the local contact characteristics of point-contact. The coupling effect between the meshing teeth pairs and the fillet-foundation stiffness are both considered. The position, size and incompleteness of the CE are determined by the movement of the meshing tracks which are derived from the explicit equation and multi-state meshing regions of SFGD and the load distribution ratio (LDR) calculated based on them. The characteristics of point contact are qualitatively verified experimentally. The results show that LDR mutations of gear switching are reduced considering incomplete CE. TVMS of point-contact considering deformation suppression is improved by an order of magnitude compared to the one of line-contact which may be the cause for the high carrying capacity of point-contact. It can be the basis to investigate the characteristics of SFGD and the point-contact further. This method is applicable to the study of point-contact in other fields.</p></div>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":"60 9","pages":"2893 - 2925"},"PeriodicalIF":2.1,"publicationDate":"2025-08-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248141","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

Research on the water–gas flow pattern of in horizontal aeration pipes 卧式曝气管道内水气流态的研究

IF 2.1 3区工程技术

Meccanica Pub Date : 2025-07-28 DOI: 10.1007/s11012-025-02034-x

Chilin Wei, Ruichao Hao, Delan Zhu, Ximu Zhao, Nazarov Khudayberdi, Changxin Liu

{"title":"Research on the water–gas flow pattern of in horizontal aeration pipes","authors":"Chilin Wei, Ruichao Hao, Delan Zhu, Ximu Zhao, Nazarov Khudayberdi, Changxin Liu","doi":"10.1007/s11012-025-02034-x","DOIUrl":"10.1007/s11012-025-02034-x","url":null,"abstract":"<div><p>Aeration irrigation has garnered significant attention due to its effectiveness in enhancing crop yield and water use efficiency. Understanding the two-phase flow mechanism of water–gas in the aeration pipeline is of great significance for promoting the development of the aeration irrigation system. In this study, a formula for calculating Reynolds number of water–gas flow in aeration pipeline was established by combining theoretical analysis with experimental verification. In addition, based on the YOLO v5 image classification model, a classification and detection model of water–gas flow pattern was proposed. The results show that increasing aeration rate can increase pipeline pressure. The overall accuracy of the developed flow pattern detection software was 86.3%, which can meet the requirements of practical application. Finally, based on image classification and theoretical analysis, the formulas of the corresponding flow patterns were obtained. This study provides a solution for determining the two-phase flow pattern of water–gas in aerated irrigation system, which was of great significance for improving the hydraulic calculation of aerated irrigation system and promoting the wide application of aerated irrigation technology.</p></div>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":"60 8","pages":"2519 - 2531"},"PeriodicalIF":2.1,"publicationDate":"2025-07-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145230354","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

Numerical analysis of ARJ21 passenger aircraft ditching dynamics using meshless methods ARJ21客机迫降动力学的无网格方法数值分析

IF 2.1 3区工程技术

Meccanica Pub Date : 2025-07-21 DOI: 10.1007/s11012-025-02032-z

Tao Ma, Xiang Liu, Lisheng Liu, Yazhong Jiang, Lin Ren, Xin Lai

引用次数: 0

An analytic iterative method for tension distribution of cable-driven robots with a variable objective point 变目标点索驱动机器人张力分布的解析迭代法

IF 2.1 3区工程技术

Meccanica Pub Date : 2025-07-15 DOI: 10.1007/s11012-025-02028-9

Mohammad Ali Maneshi, Sajjad Taghvaei

引用次数: 0

Preface to the special issue on OpenFOAM 关于OpenFOAM特刊的序言

IF 2.1 3区工程技术

Meccanica Pub Date : 2025-07-14 DOI: 10.1007/s11012-025-02031-0

Joel Guerrero, Jan Pralits

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Influence of coalescence-induced droplet jumping by W-shaped groove structures on superhydrophobic surfaces w型槽结构对超疏水表面聚结诱导液滴跳跃的影响

IF 2.1 3区工程技术

Meccanica Pub Date : 2025-07-10 DOI: 10.1007/s11012-025-02011-4

XianMing Gao, XiaoSong Ren, WenXuan Yang, YanLong Zhang, YuHan Li

{"title":"Influence of coalescence-induced droplet jumping by W-shaped groove structures on superhydrophobic surfaces","authors":"XianMing Gao, XiaoSong Ren, WenXuan Yang, YanLong Zhang, YuHan Li","doi":"10.1007/s11012-025-02011-4","DOIUrl":"10.1007/s11012-025-02011-4","url":null,"abstract":"<p>The coalescence-induced droplet jumping phenomenon on superhydrophobic surfaces has been demonstrated to have significant potential in chip-related applications, including efficient heat dissipation, enhanced corrosion resistance, and effective anti-icing performance. The current research landscape on superhydrophobic surfaces predominantly focuses on single-groove or convex configurations for droplet jumping behavior, which exhibit limited efficacy in enhancing energy conversion efficiency. In this study, a W-shaped groove structure comprising dual V-grooves was designed on superhydrophobic surfaces, with optimal parameters determined through experimental optimization. This configuration achieved a maximum droplet jumping velocity of <i>V* j</i> = 0.65 and an energy conversion efficiency of <i>η</i> = 35.04%, representing an 8.76-fold improvement over conventional flat superhydrophobic surfaces. Numerical simulations revealed that the dual-groove geometry and central convexity of the W-shaped structure reduced droplet coalescence time and amplified energy conversion efficiency. Additionally, the influence of W-shaped grooves on asymmetric droplet coalescence-induced jumping was systematically investigated. These results provide a theoretical framework for advancing surface engineering in condensation heat transfer, defrosting, and corrosion prevention applications.</p>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":"60 9","pages":"2837 - 2852"},"PeriodicalIF":2.1,"publicationDate":"2025-07-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11012-025-02011-4.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248143","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"RegionCategory":"工程技术","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

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Influences of bionic dual trailing-edge flaps on the aerodynamic performance of vertical axis wind turbine 仿生双尾缘襟翼对垂直轴风力机气动性能的影响

IF 2.1 3区工程技术

Meccanica Pub Date : 2025-07-07 DOI: 10.1007/s11012-025-02015-0

Jun Qu, Hao Yu, Ying Wang, Chun Li, Xingzhi Zhang, Zhou Ye

{"title":"Influences of bionic dual trailing-edge flaps on the aerodynamic performance of vertical axis wind turbine","authors":"Jun Qu, Hao Yu, Ying Wang, Chun Li, Xingzhi Zhang, Zhou Ye","doi":"10.1007/s11012-025-02015-0","DOIUrl":"10.1007/s11012-025-02015-0","url":null,"abstract":"<div><p>To improve the aerodynamic performance and optimize the flow field structure of H-type vertical axis wind turbines (VAWTs), a split trailing-edge double-flap structure inspired by bionic fish tail fins was proposed, while maintaining the original airfoil parameters. Using 2D and 3D computational fluid dynamics (CFD), the effects of varying flap relative lengths (<i>x</i>/<i>c</i>), upper and lower flap deflection angles, and active control strategies on aerodynamic performance (<i>C</i><sub><i>p</i></sub>) were systematically investigated. First, the power coefficient and instantaneous torque of individual blades through comparative analysis to determine the optimal <i>x</i>/<i>c</i>. Second, the influence of different upper and lower flap deflection angles on the overall torque was investigated. Finally, active control strategies were applied to explore their effects on the power coefficient and tangential force. Results showed that <i>x</i>/<i>c</i> = 0.2 provided the most significant improvement. At an upper flap deflection angle of 30°, notable performance enhancements were observed across the studied tip speed ratio (<i>TSR</i>) range. When both deflection angles were 30°, the improvement extended to a wider <i>TSR</i> range. Active control increased blade surface velocity gradients, optimized velocity distributions, and enhanced blade torque.</p></div>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":"60 9","pages":"2815 - 2835"},"PeriodicalIF":2.1,"publicationDate":"2025-07-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248258","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

Functional resonator-based nonlocal FGP hollow adsorber for wide detection of coupled biomolecules using DQM framework 基于功能谐振器的非局部FGP中空吸附剂用于DQM框架的偶联生物分子的广泛检测

IF 2.1 3区工程技术

Meccanica Pub Date : 2025-07-06 DOI: 10.1007/s11012-025-02025-y

Mohamed Mektout, Hicham Bourouina, Yahia Maiza, Soumia Khouni, Abir Lamari, Brahim Said Djellali, Lamine Elaihar

{"title":"Functional resonator-based nonlocal FGP hollow adsorber for wide detection of coupled biomolecules using DQM framework","authors":"Mohamed Mektout, Hicham Bourouina, Yahia Maiza, Soumia Khouni, Abir Lamari, Brahim Said Djellali, Lamine Elaihar","doi":"10.1007/s11012-025-02025-y","DOIUrl":"10.1007/s11012-025-02025-y","url":null,"abstract":"<div><p>This study examines the resonance frequency shift due to adsorption in a biomolecule-resonator sandwich nanobeam system under a temperature-induced load. The analysis incorporates shear deformation, distributed adatoms, and small-scale effects within the framework of nonlocal elasticity theory (NET). The sandwich nanobeam consists of three sections: a perforated core with a uniform square-hole pattern and two bonded functionally graded porous (FGP) layers. Adsorption-induced energy is modeled using a distribution-based approach for spike proteins and bio-receptors. The dynamic model of the nanobeam resonator integrates surface stress effects. The functional nanobeam and localized biomolecule models are used in conjunction with van der Waals (vdW) forces, employing the Lennard–Jones (6–12) and Morse potentials to assess all influencing factors. Shear force and inertia moment are explicitly derived from the nonlocal Timoshenko beam equations, with residual stress considered as an additional axial load. The Navier technique and differential quadrature method (DQM) are employed to solve the motion equations, enabling a comprehensive interpretation of the results. Numerical findings reveal that surface properties, adsorbed adatoms, perforation dimensions, hole number, thermal loads, variation in power law index, porosity parameters, and the positioning of receptors and spikes all influence the frequency shift. Results further indicate that interatomic interactions reduce system stiffness, emphasizing their significance in computational analysis. The proposed model effectively evaluates the dynamic response of biomolecule-resonators and can determine the mass and density of viruses and spikes while accounting for adatom bonding effects.</p></div>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":"60 9","pages":"2779 - 2813"},"PeriodicalIF":2.1,"publicationDate":"2025-07-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248277","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

Controlling nonlinear vehicular motions by exploiting linearized feedback law under delay-tolerance: stability, gain-scheduling, and validation 利用时滞容限下的线性反馈律控制非线性车辆运动：稳定性、增益调度和验证

IF 2.1 3区工程技术

Meccanica Pub Date : 2025-07-05 DOI: 10.1007/s11012-025-02027-w

Hangyu Lu, Xiaodong Wu, Sheng Zhao, Liang Yan, Jianwei Lu

{"title":"Controlling nonlinear vehicular motions by exploiting linearized feedback law under delay-tolerance: stability, gain-scheduling, and validation","authors":"Hangyu Lu, Xiaodong Wu, Sheng Zhao, Liang Yan, Jianwei Lu","doi":"10.1007/s11012-025-02027-w","DOIUrl":"10.1007/s11012-025-02027-w","url":null,"abstract":"<div><p>The automation of transportation systems inevitably faces the challenge of enhancing both the safety and intelligence of passenger vehicles. In this transitional stage toward full automation, advanced driver assistance systems (ADAS) play a critical role in bridging the gap. A key component of ADAS is vehicle stability control (VSC), which ensures motion stability during highly nonlinear handling maneuvers. This paper addresses the system nonlinearity under critical driving conditions and the loop delays within feedback processes by proposing a delay-tolerant feedback structure for VSC. The approach utilizes only the linearized dynamics along the trajectory of the maneuver, where the target-tracking performance is optimized. A nonlinear vehicle model is first constructed, followed by an investigation of its open-loop characteristics through equilibrium analysis and local linearization. Time delays arising from control sampling and actuation are incorporated into the feedback torque, yielding a delayed nonlinear system. A semi-discretized method is developed to construct stability charts of the tunable control gains, whose aggregation yields a conservative delay-tolerant domain. Two gain scheduling strategies are proposed to achieve maximum target-tracking performance, tailored for either real-time (RT) or offline implementation. The proposed method is designed for stable tracking of dynamic motion references under nonlinear conditions and is validated using experimental data-based simulations. The results demonstrate that a linearized control law, when properly designed, can deliver high-performance VSC with strong adaptability across different control loops subject to varying delays.</p></div>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":"60 9","pages":"2759 - 2778"},"PeriodicalIF":2.1,"publicationDate":"2025-07-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145248192","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