Acta Mechanica最新文献_第6页

Hydrodynamic performance of an array of submerged rigid elliptic disks under wave scattering and radiation 水下刚性椭圆盘阵列在波散射和辐射作用下的水动力性能

IF 4 3区工程技术

Acta Mechanica Pub Date : 2026-05-21 DOI: 10.1007/s00707-026-04718-1

Ajijul Hoque, Leandro Farina, R. Gayen, Ranadev Datta

{"title":"Hydrodynamic performance of an array of submerged rigid elliptic disks under wave scattering and radiation","authors":"Ajijul Hoque, Leandro Farina, R. Gayen, Ranadev Datta","doi":"10.1007/s00707-026-04718-1","DOIUrl":"10.1007/s00707-026-04718-1","url":null,"abstract":"<div><p>This paper develops a mathematically rigorous framework for analyzing the scattering and radiation of water waves by an array of submerged elliptic disks in deep water, a significant generalization of the classical single-disk problem. The transition from one disk to multiple elliptic bodies introduces substantial analytical challenges, including strongly coupled hypersingular boundary-integral equations, nontrivial elliptic parametrizations and intricate multi-body interactions. These are tackled by an expansion–collocation (spectral) method based on associated Legendre polynomials, together with an analytic treatment of the hypersingular terms for elliptic domains, leading to a large but structured matrix system that captures full multi-body interaction. The resulting scheme is used to compute surface elevation, scattering characteristics, hydrodynamic forces, added mass and damping coefficients for various array configurations. The computations show how the interplay of geometry, spacing and submergence controls scattering behavior, hydrodynamic forces and radiation coefficients. The study thus provides both a mathematically robust methodology for treating wave interaction with arrays of non-circular bodies and physically relevant insight for the design of submerged wave-interacting structures such as wave energy devices and offshore components.</p></div>","PeriodicalId":456,"journal":{"name":"Acta Mechanica","volume":"237 8","pages":"4873 - 4894"},"PeriodicalIF":4.0,"publicationDate":"2026-05-21","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00707-026-04718-1.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148878030","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}

引用次数: 0

Impact resistance and numerical with computational analysis of nano-reinforced composite football shin guards using higher-order panel theory 应用高阶面板理论对纳米增强复合材料足球护胫抗冲击性能进行数值计算分析

IF 4 3区工程技术

Acta Mechanica Pub Date : 2026-05-20 DOI: 10.1007/s00707-026-04728-z

Jun Li, Jiang Li, Dongxia Huang, Kuo Li, Ji Feng, Zengmin Li

{"title":"Impact resistance and numerical with computational analysis of nano-reinforced composite football shin guards using higher-order panel theory","authors":"Jun Li, Jiang Li, Dongxia Huang, Kuo Li, Ji Feng, Zengmin Li","doi":"10.1007/s00707-026-04728-z","DOIUrl":"10.1007/s00707-026-04728-z","url":null,"abstract":"<div><p>This paper examines the impact resistance and dynamic behavior of nano-reinforced composite football shin guards that are truncated conical panels based on higher-order panel theory. The determination of effective material properties containing graphene nanoplatelets (GNPs), carbon nanotubes (CNTs), nano-silica, nano-clay, nano-alumina, and graphene oxide are identified using the Halpin–Tsai micromechanics model. The governing equations are solved using the analytical method. Parametric studies are done on the effect of nanoparticle type, filler distribution, panel geometry and thickness on the deflection, energy absorption, and impact resistance. It is found that, with 1.5% weight percentage of GNP, there is a reduction of maximum deflection by 24.8% and an increase in absorbed energy by 21%, which indicates a powerful stiffening and toughening effect. Also, with the increase in panel thickness from 1.5 to 4 mm, it is found that the deflection peaks by approximately 78.9% are reduced. The best results among various nanofillers were achieved using hybrid GNP + CNT systems, which improved the impact resistance (maximum of 2%).</p></div>","PeriodicalId":456,"journal":{"name":"Acta Mechanica","volume":"237 8","pages":"4823 - 4846"},"PeriodicalIF":4.0,"publicationDate":"2026-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148878043","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

Modeling and parametric analysis of a helicopter split-torque transmission system coupled with rotor–engine subsystems 直升机旋翼-发动机耦合分转矩传动系统建模与参数分析

IF 4 3区工程技术

Acta Mechanica Pub Date : 2026-05-20 DOI: 10.1007/s00707-026-04747-w

Jingwei Ding, Guanghu Jin

{"title":"Modeling and parametric analysis of a helicopter split-torque transmission system coupled with rotor–engine subsystems","authors":"Jingwei Ding, Guanghu Jin","doi":"10.1007/s00707-026-04747-w","DOIUrl":"10.1007/s00707-026-04747-w","url":null,"abstract":"<div><p>During helicopter operations, continuous pilot control adjustments induce variations in aerodynamic parameters, which are subsequently transmitted to the transmission system through changes in engine output and main/tail rotor loads, thereby influencing the dynamic behavior of transmission system. To elucidate the influence patterns of pilot control parameters on helicopter transmission system dynamics, this study establishes a comprehensive rotor–engine–transmission coupled dynamic model. The helicopter flight dynamic model is developed based on a linear quasi-steady blade element aerodynamic model and uniform induced velocity theory. The engine thermodynamic model is formulated using the component-based method, while the transmission system is modeled via the lumped-parameter approach, incorporating internal and external excitation sources. A fully coupled dynamic framework is established and solved numerically using the Newton–Raphson algorithm, the finite difference method, and the Runge–Kutta integration scheme. Furthermore, parametric studies are conducted to systematically evaluate the effects of key control inputs—including main rotor and tail rotor collective pitches, as well as lateral and longitudinal cyclic pitches—on the dynamic characteristics of the transmission system. The results reveal that these control parameters significantly modulate the vibration amplitudes and dynamic load distribution, although they do not alter the quasi-periodic nature of the torsional meshing vibration. This work provides a robust theoretical foundation for the design and performance optimization of helicopter transmission systems under complex flight conditions.</p></div>","PeriodicalId":456,"journal":{"name":"Acta Mechanica","volume":"237 8","pages":"4847 - 4871"},"PeriodicalIF":4.0,"publicationDate":"2026-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148878098","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

Thermo-electro-mechanical nonlinear axisymmetric large deformation of two-directional functionally graded circular plate reinforced with graphene platelets 石墨烯片增强双向功能梯度圆板的热-电-机械非线性轴对称大变形

IF 4 3区工程技术

Acta Mechanica Pub Date : 2026-05-19 DOI: 10.1007/s00707-026-04737-y

Jinghua Zhang, Yahong Zhang

{"title":"Thermo-electro-mechanical nonlinear axisymmetric large deformation of two-directional functionally graded circular plate reinforced with graphene platelets","authors":"Jinghua Zhang, Yahong Zhang","doi":"10.1007/s00707-026-04737-y","DOIUrl":"10.1007/s00707-026-04737-y","url":null,"abstract":"<div><p>The nonlinear large deformations of two-directional functionally graded circular plate reinforced with graphene platelets (GPL) under coupled thermo‑electro‑mechanical loadings are investigated. The GPL content in the plate varies continuously along both the thickness and radial directions following power‑law distributions. Consequently, the equivalent material properties, varying continuously in both directions, are estimated by the Halpin–Tsai model together with the rule of mixtures. The radially varying stiffness coefficients are rigorously obtained through integration. Then, considering von Kármán geometric nonlinearity, thermoelastic theory and piezoelectric effects, strongly nonlinear governing equations for large deflections of the plate under multi-physics coupling are established. The shooting method is employed to solve the equations and to acquire numerical results for deflections. Subsequently, effects of GPL mass fraction, distribution patterns, geometric size, applied load and voltage, as well as temperature difference on the maximum deflection are discussed. Results demonstrate that appropriate adjustment of these factors can effectively enhance structural stiffness and facilitate structural optimization. The outcomes offer a theoretical basis for design of high-performance two-directional gradient plates under complex multi-physics coupling conditions.</p></div>","PeriodicalId":456,"journal":{"name":"Acta Mechanica","volume":"237 8","pages":"4807 - 4821"},"PeriodicalIF":4.0,"publicationDate":"2026-05-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148878213","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

Dynamic response of rigid walls retaining steel strip-reinforced soil to earthquake excitation 刚墙挡土钢带加筋土在地震作用下的动力响应

IF 4 3区工程技术

Acta Mechanica Pub Date : 2026-05-15 DOI: 10.1007/s00707-026-04735-0

T. Gortsas, N. D. Beskou, D. Polyzos

{"title":"Dynamic response of rigid walls retaining steel strip-reinforced soil to earthquake excitation","authors":"T. Gortsas, N. D. Beskou, D. Polyzos","doi":"10.1007/s00707-026-04735-0","DOIUrl":"10.1007/s00707-026-04735-0","url":null,"abstract":"<div><p>The dynamic pressures induced by earthquake forces on a pair of rigid walls retaining steel strip-reinforced elastic soil over bedrock, are investigated through an analytical/numerical solution procedure under plane strain conditions. The reinforced soil is treated as an elastic continuum consisting of two phases: the elastic soil matrix in plane strain and the horizontally arranged steel strips under axial deformation. Thus, there are three governing equations of motion in terms of displacements: two for the elastic soil matrix and one for the elastic steel strips, coupled through interaction forces. Assuming time harmonic seismic excitation and expanding the displacements in Fourier sine and cosine series with respect to the horizontal coordinate, one can reduce the governing system of partial differential equations of motion to ordinary ones with respect to the vertical coordinate. Solving this system, the seismic pressure on the wall as well as the shear force and bending moment at the wall base are determined analytically. The response to transient earthquake forces is obtained numerically through Fourier synthesis. The employment of the solution to obtain results for the special case of the unreinforced soil and the comparison of those results against existing ones in the literature serve to verify that solution. Parametric studies are then presented to investigate the effects of soil reinforcement on the seismic response of the wall-soil system.</p></div>","PeriodicalId":456,"journal":{"name":"Acta Mechanica","volume":"237 8","pages":"4783 - 4806"},"PeriodicalIF":4.0,"publicationDate":"2026-05-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00707-026-04735-0.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148878034","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}

引用次数: 0

Exact analysis of steady Oseen-type conjugate heat transfer from a circular cylinder to a low Reynolds number crossflow 从圆柱到低雷诺数横流的稳定oseen型共轭传热的精确分析

IF 4 3区工程技术

Acta Mechanica Pub Date : 2026-05-13 DOI: 10.1007/s00707-026-04676-8

Amin Moosaie

{"title":"Exact analysis of steady Oseen-type conjugate heat transfer from a circular cylinder to a low Reynolds number crossflow","authors":"Amin Moosaie","doi":"10.1007/s00707-026-04676-8","DOIUrl":"10.1007/s00707-026-04676-8","url":null,"abstract":"<div><p>This work introduces, for the first time, an exact analytical solution describing steady conjugate heat transfer from a circular cylinder subjected to a low Reynolds number crossflow. The analysis rigorously solves the heat conduction equation within the cylindrical shell and the Oseen-type convective transport equation in the surrounding fluid. These solutions are seamlessly coupled at the solid–fluid interface to ensure complete physical and mathematical consistency. Represented as infinite series expansions in orthogonal functions, the resulting expressions provide closed-form descriptions of the temperature distributions in both the solid and fluid regions, along with explicit formulae for the local and average Nusselt numbers. Parametric investigations explore the influence of key factors, including shell thickness, the thermal conductivity ratio between the fluid and the solid and the Reynolds number, on interfacial temperature and heat transfer rates. A correlation involving drag coefficient, Reynolds number and Nusselt number is presented, offering insight into the competitive dynamics between momentum and heat transfer in conjugate heat transfer from hollow cylinders at low Reynolds numbers. The outcomes are pertinent not only to the fundamental understanding of conjugate heat transfer phenomena but also to engineering applications, such as the thermal performance evaluation of constant-temperature hot-wire anemometers. Furthermore, owing to the analogy between heat and mass transport, the analytical framework developed here is equally applicable to conjugate mass transfer from cylindrical bodies.</p></div>","PeriodicalId":456,"journal":{"name":"Acta Mechanica","volume":"237 8","pages":"4745 - 4771"},"PeriodicalIF":4.0,"publicationDate":"2026-05-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148878042","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

Thickness-twist and face-shear waves in a lithium niobate plate with an elastic layer 具有弹性层的铌酸锂板的厚度扭曲和面切变波

IF 4 3区工程技术

Acta Mechanica Pub Date : 2026-05-13 DOI: 10.1007/s00707-026-04744-z

Chong Liu, Dejin Huang, Hui Chen, Tingfeng Ma, Yangyang Zhang

引用次数: 0

Non-degeneracy of coated laminates with a degenerate core 具有简并芯的涂层层压板的非简并性

IF 4 3区工程技术

Acta Mechanica Pub Date : 2026-05-12 DOI: 10.1007/s00707-026-04710-9

Jonas Lendvai, Matti Schneider

{"title":"Non-degeneracy of coated laminates with a degenerate core","authors":"Jonas Lendvai, Matti Schneider","doi":"10.1007/s00707-026-04710-9","DOIUrl":"10.1007/s00707-026-04710-9","url":null,"abstract":"<div><p>Coated laminates arise from sequential lamination, where a core phase is repeatedly embedded into a coating phase along varying lamination directions and volume fractions. For non-degenerate material parameters, explicit formulas for the effective conductivity and stiffness of such microstructures are well established. This work investigates coated laminates with a <i>degenerate core</i>, including insulating and perfectly conducting phases in thermal conductivity as well as porous and rigid phases in linear elasticity. Motivated by observations in deep material networks, we analyze under which conditions the effective tensors of a coated laminate become non-degenerate despite the degeneracy of the core. We develop an abstract operator-theoretic framework in a Hilbert space setting that encompasses both conductivity and elasticity and allows a unified treatment of vanishing and infinite material parameters. Within this framework, we establish well-posedness of the coating process and derive explicit criteria for non-degeneracy in terms of intersection properties of suitable subspaces. The abstract results are subsequently specialized to thermal conductivity and linear elasticity, where the derived criteria yield explicit conditions for the non-degeneracy.\u0000</p></div>","PeriodicalId":456,"journal":{"name":"Acta Mechanica","volume":"237 8","pages":"4717 - 4744"},"PeriodicalIF":4.0,"publicationDate":"2026-05-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00707-026-04710-9.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148877958","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}

引用次数: 0

Interfacial discontinuity effects on transient contact response of polymer-based magnetoelectric coatings with smart composite substrates via hybrid element method 界面不连续对智能复合基片聚合物基磁电涂层瞬态接触响应的影响

IF 4 3区工程技术

Acta Mechanica Pub Date : 2026-05-11 DOI: 10.1007/s00707-026-04724-3

Chi Hu, Huoming Shen, Jialing Li, Yuxing Wang, Peng Li, Guoyong Zhang, Yang Hai, Xin Zhang

{"title":"Interfacial discontinuity effects on transient contact response of polymer-based magnetoelectric coatings with smart composite substrates via hybrid element method","authors":"Chi Hu, Huoming Shen, Jialing Li, Yuxing Wang, Peng Li, Guoyong Zhang, Yang Hai, Xin Zhang","doi":"10.1007/s00707-026-04724-3","DOIUrl":"10.1007/s00707-026-04724-3","url":null,"abstract":"<div><p>Interface defects or weak bondings often induce the degradation of multiphysics coupling properties in intelligent magnetoelectric structures during operational contact situations. This study develops a computational model combining the hybrid element method to solve transient contact responses of the polymer-based magnetoelectric coating imperfectly bonded to a magneto-electro-elastic substrate with efficiency. The interfacial discontinuity of mechanical and electromagnetic fields is characterized by five imperfection indices, quantifying the discontinuous transfer of the displacement, electric potential, and magnetic potential across the coating–substrate interface. Time-dependent relaxation functions are employed to derive viscoelastic frequency response functions by replacing the corresponding elastic Green’s function based on the elastic–viscoelastic correspondence principle. Parametric analyses are conducted to investigate the effect of the film thickness, friction coefficient, action time, and imperfection index. Numerical simulations under five distinct interfacial conditions show that interfacial imperfections can lead to stress redistribution or concentration, enhance the viscoelastic friction, and modulate magnetoelectric coupling. This study can provide a theoretical basis for structural reliability and performance optimization.</p></div>","PeriodicalId":456,"journal":{"name":"Acta Mechanica","volume":"237 8","pages":"4681 - 4715"},"PeriodicalIF":4.0,"publicationDate":"2026-05-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148878185","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

Thermomechanical postbuckled vibration response of doubly curved sandwich shallow shells with FGM core layer and hybrid face layers 具有FGM芯层和杂化面层的双弯曲夹层浅壳的热力学后屈曲振动响应

IF 4 3区工程技术

Acta Mechanica Pub Date : 2026-05-08 DOI: 10.1007/s00707-026-04720-7

Yusuf Bahçacı, Zehra Şule Garip, İsmail Esen

{"title":"Thermomechanical postbuckled vibration response of doubly curved sandwich shallow shells with FGM core layer and hybrid face layers","authors":"Yusuf Bahçacı, Zehra Şule Garip, İsmail Esen","doi":"10.1007/s00707-026-04720-7","DOIUrl":"10.1007/s00707-026-04720-7","url":null,"abstract":"<div><p>This study models and analyzes the thermomechanical vibration behavior of doubly curved sandwich shallow shells using a novel high-order sinusoidal shear stress theorem. The equations of motion are derived from Hamilton's principle and solved with the Navier method. The doubly curved sandwich shell comprises a functionally graded core layer and a hybrid surface layer made of metal and ceramic. The analysis extensively examines the effects of the FGM core layer, hybrid surface layers, radii of curvature, and thickness ratios on the thermomechanical vibration behavior of the doubly curved sandwich shell, with results presented accordingly. The surface layers consist of pure metal, pure ceramic, and a hybrid of metal and ceramic, whereas the core layer is functionally graded, featuring metal on the bottom surface and ceramic on the top surface, with variations in composition throughout the thickness based on the Power-law. This study's results are anticipated to advance the fields of aviation, space, and construction, particularly in thermal and vibration barrier applications, the design of specialized structures for safeguarding critical equipment, and the development of submarine vehicle hulls and protective structures. A review of the literature reveals that no previous study of this kind has been conducted, and this study is expected to make a significant contribution to the literature.</p></div>","PeriodicalId":456,"journal":{"name":"Acta Mechanica","volume":"237 8","pages":"4653 - 4679"},"PeriodicalIF":4.0,"publicationDate":"2026-05-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s00707-026-04720-7.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"148878047","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}

引用次数: 0