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

Correction: Appraisal of the overburden mass and boundary conditions on the rocking behaviour of the vertical spanning strip wall 修正：对垂直跨条形墙体摇摆特性的覆盖层质量和边界条件的评价

IF 2.1 3区工程技术

Meccanica Pub Date : 2025-06-27 DOI: 10.1007/s11012-025-02014-1

Georgios Vlachakis, Carla Colombo, Dario Vecchio, Anastasios I. Giouvanidis, Paulo B. Lourenço

引用次数: 0

Buckling and post-buckling analysis of masonry walls using Virtual Elements and cohesive interfaces 基于虚拟单元和黏结界面的砌体墙体屈曲和后屈曲分析

IF 2.1 3区工程技术

Meccanica Pub Date : 2025-06-23 DOI: 10.1007/s11012-025-02016-z

Marco Nale, Cristina Gatta, Daniela Addessi, Elena Benvenuti, Elio Sacco

引用次数: 0

Image-based structural kinematic limit analysis for historical masonry structures 基于图像的历史砌体结构运动极限分析

IF 2.1 3区工程技术

Meccanica Pub Date : 2025-04-30 DOI: 10.1007/s11012-025-01977-5

Yahroun Fei Long Hermans, Karim Ehab Moustafa Kamel, Olivier Debeir, Gabriele Milani, Thierry Jacques Massart

{"title":"Image-based structural kinematic limit analysis for historical masonry structures","authors":"Yahroun Fei Long Hermans, Karim Ehab Moustafa Kamel, Olivier Debeir, Gabriele Milani, Thierry Jacques Massart","doi":"10.1007/s11012-025-01977-5","DOIUrl":"10.1007/s11012-025-01977-5","url":null,"abstract":"<div><p>Evaluating the state of historical masonry structures, particularly those built with irregular masonry, presents challenges in determining their load-bearing capacity. Most current approaches use macroscopic numerical models that treat the material as a homogeneous continuum, where defining an appropriate constitutive law is essential. To this end, homogenization has proven useful in bridging the gap between meso and macro-scales, yet using homogenized macromodels may prevent to capture specific failure modes. Alternatively, mesoscopic methodologies represent stacking modes explicitly. However, full structural analysis at this scale has mainly been applied to regular masonry due to the complexities of explicitly representing the geometry of the irregular stones. The present contribution aims to propose a method that leverages image acquisition techniques, such as orthophotos, to address these challenges. Mortar joints are lumped onto zero-thickness interfaces, determined through a distance field-based morphing procedure and medial axis principles. The load-bearing capacity is assessed using a Kinematic Limit Analysis problem, formulated and solved as a linear programming problem. A Mohr-Coulomb frictional behavior, modified with a tensile cut-off and a linearized compression cap, is assigned to the mortar joints. The blocks are considered infinitely rigid and strong. It is shown that the proposed methodology can efficiently model structures of large sizes, by illustrating its use on two 2D problems.</p></div>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":"60 7","pages":"2107 - 2124"},"PeriodicalIF":2.1,"publicationDate":"2025-04-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144888079","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

Optimal design of a novel tuned mass rate-independent damper for structural vibration suppression 一种新型调谐质量率不相关结构阻尼器的优化设计

IF 1.9 3区工程技术

Meccanica Pub Date : 2025-04-17 DOI: 10.1007/s11012-025-01980-w

Junqi Jiang, Shun Weng, Hao Luo, Hongping Zhu

引用次数: 0

Research on the stiffness of spur gear pairs based on the improved energy method under multiple influencing factors 多影响因素下基于改进能量法的正齿轮副刚度研究

IF 1.9 3区工程技术

Meccanica Pub Date : 2025-04-15 DOI: 10.1007/s11012-025-01979-3

Fei Hu, Biao Luo, Fu-hua He, Qiao Yang

{"title":"Research on the stiffness of spur gear pairs based on the improved energy method under multiple influencing factors","authors":"Fei Hu, Biao Luo, Fu-hua He, Qiao Yang","doi":"10.1007/s11012-025-01979-3","DOIUrl":"10.1007/s11012-025-01979-3","url":null,"abstract":"<div><p>To investigate the effects of axial misalignment, lead crown relief, and temperature on the meshing stiffness of gears, this study aims to derive high-precision gear stiffness values that are more aligned with practical engineering applications. Based on the thermal expansion theory, slice coupling effect, and involute profile theory, a thermal stiffness model for meshing spur gear pairs under multiple influencing factors has been established, integrating the improved potential energy method and the nonlinear contact stiffness calculation approach. A calculation method for the thermal stiffness of meshing spur gear pairs, considering the impacts of axial misalignment and lead crown relief, has been developed. Furthermore, the mechanisms by which varying temperature, modification amounts, and misalignment affect the meshing stiffness of spur gear pairs have been explored. The results indicate that both lead crown relief and axial misalignment alter the load distribution across the tooth width, leading to a relative load concentration and consequently affecting the deformation of the gears under external loading, thereby influencing their meshing stiffness. It was found that the meshing stiffness decreases with an increase in axial misalignment and lead crown relief amounts. Additionally, with the introduction of temperature effects, an increase in temperature further reduces the meshing stiffness of the gear pair. The thermal deformation induced by temperature variations results in profile errors, affecting the actual meshing positions of the gears and altering the dimensions of single and double tooth intervals along the meshing line. This research establishes a theoretical foundation for the design of gear systems and the study of gear transmission system dynamics.</p></div>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":"60 4","pages":"1079 - 1097"},"PeriodicalIF":1.9,"publicationDate":"2025-04-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143896760","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

Spur gear teeth profile optimization through tensor-based kinematics: integrating the Reuleaux method with differential evolution 基于张量运动学的直齿齿轮齿形优化：勒洛法与微分演化的结合

IF 1.9 3区工程技术

Meccanica Pub Date : 2025-04-10 DOI: 10.1007/s11012-025-01970-y

Michał Batsch

{"title":"Spur gear teeth profile optimization through tensor-based kinematics: integrating the Reuleaux method with differential evolution","authors":"Michał Batsch","doi":"10.1007/s11012-025-01970-y","DOIUrl":"10.1007/s11012-025-01970-y","url":null,"abstract":"<div><p>This paper presents a novel method for spur gear tooth profile optimization, addressing the challenge of designing gears with improved performance. Traditional gear designs often compromise between contact stress, wear, and noise. This research explores a wider design space to identify gear profiles offering a better balance. The proposed approach leverages tensor-based kinematics combined with the Reuleaux method for conjugate profile generation, creating a robust framework for exploring potential designs. This framework defines an objective function considering multiple performance criteria. Differential evolution is employed to search for novel tooth profiles minimizing this function. The performance of optimized profiles is compared against existing designs, including involute, S-gears, and cosine gears. Key performance indicators include Hertz contact and subsurface shear stresses, normal force, sliding factor, specific sliding, contact ratio, and gear mesh stiffness. Results demonstrate the method’s effectiveness in generating improved tooth profiles. Optimized solutions exhibited contact and shear stress reductions comparable to 30-degree involute and S-gears, suggesting improved pitting resistance and wear. Some designs showed substantial specific sliding reductions, indicating the potential for reduced heat generation and surface wear. While cosine gears showed reduced contact stress, they also exhibited lower contact ratios, potentially increasing dynamic loads. These optimized solutions offer a promising path towards designing high-performance gears tailored to specific applications. The method effectively explores the vast solution space and generates tooth profiles fulfilling desired optimization trade-offs, paving the way for future research incorporating additional performance criteria and exploring more complex gear geometries.</p></div>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":"60 4","pages":"1053 - 1077"},"PeriodicalIF":1.9,"publicationDate":"2025-04-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143896755","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

Dynamics of a flutter-excited articulated ichthyoid propulsor 颤振激励关节式鱼状体推进器动力学

IF 1.9 3区工程技术

Meccanica Pub Date : 2025-04-08 DOI: 10.1007/s11012-025-01974-8

Tomasz Szmidt

{"title":"Dynamics of a flutter-excited articulated ichthyoid propulsor","authors":"Tomasz Szmidt","doi":"10.1007/s11012-025-01974-8","DOIUrl":"10.1007/s11012-025-01974-8","url":null,"abstract":"<div><p>A concept of an ichthyoid propulsor mimicking the undulating motion of a swimming fish is proposed and verified. The propulsor consists of an articulated fluid-conveying pipe with a triangular fin attached to its free end. A sufficiently high flow velocity in the propulsor leads to the instability of the system and the possible appearance of snake-like flutter vibrations. A dynamical model of the system is proposed. It is based on classical Benjamin’s model of the dynamics of an articulated fluid-conveying pipe and Lighthill’s elongated body theory, which quantifies hydrodynamic forces generated by the swimming fish. Parameters of the system for which the propulsor is subject to dynamic loss of stability, leading to the appearance of periodic flutter vibrations, are identified. Methods of bifurcation analysis, supported by numerical simulations, prove that the system can undergo a supercritical Hopf bifurcation. This soft self-excitation yields a stable limit cycle of the system, for which the thrust and lateral forces generated by the propulsor are calculated. It is shown that the mean value of the thrust is positive for a range of swimming speeds. The performance of the propulsor is assessed in relation to the swimming speed. The research may broaden knowledge about articulated pipes conveying fluid and support possible applications of the proposed propulsor.</p></div>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":"60 4","pages":"1035 - 1052"},"PeriodicalIF":1.9,"publicationDate":"2025-04-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143896759","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

Workspace analysis of parallel mechanisms by considering active joints ranges of motion using a method based on interval analysis 考虑活动关节运动范围的并联机构工作空间分析

IF 1.9 3区工程技术

Meccanica Pub Date : 2025-04-07 DOI: 10.1007/s11012-024-01892-1

Fatemeh Pourkariman, Mehdi Karimi, Payam Varshovi-Jaghargh, Mehdi Tale Masouleh

{"title":"Workspace analysis of parallel mechanisms by considering active joints ranges of motion using a method based on interval analysis","authors":"Fatemeh Pourkariman, Mehdi Karimi, Payam Varshovi-Jaghargh, Mehdi Tale Masouleh","doi":"10.1007/s11012-024-01892-1","DOIUrl":"10.1007/s11012-024-01892-1","url":null,"abstract":"<div><p>The parallel robots workspace plays an important role in their design and construction. In this paper, a new algorithm is presented based on the concepts of interval analysis to determine the parallel robots workspace by considering joints ranges of motion. The proposed algorithm is based on the kinematics equations, interval arithmetic computations and refinement method. In this algorithm, the system of interval nonlinear equations obtained from kinematic analysis is solved simultaneously and the refinement operation is carried out to accurately calculate the intervals of the equations. A type of refinement operation, namely the slope form, is used in this method to eliminate the excess width of intervals of equations. The proposed algorithm is implemented on 3 and 4-DOF Delta parallel robots of Human and Robot Interaction Laboratory of Tehran university. The workspace of 3-DOF Delta parallel robot and the constant-orientation workspace of 4-DOF Delta parallel obtained from the proposed method for the different active joints ranges of motion are compared with the results of the method based on interval analysis without refinement operation and the geometric method. The results show that the proposed algorithm calculates the parallel robot workspace with appropriate accuracy.</p></div>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":"60 4","pages":"1015 - 1034"},"PeriodicalIF":1.9,"publicationDate":"2025-04-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143896719","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

Static and dynamic performance of porous Ti6Al4V tibia implant designs based on triply periodic minimal surface scaffolds 基于三周期最小表面支架设计的多孔Ti6Al4V胫骨植入物的静态和动态性能

IF 1.9 3区工程技术

Meccanica Pub Date : 2025-04-06 DOI: 10.1007/s11012-025-01967-7

Basma Eltlhawy, Noha Fouda, Ibrahim Eldesouky

引用次数: 0

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