Meccanica最新文献_第10页

Optimized interval type-2 fuzzy global sliding mode control for quadrotor robot 四旋翼机器人优化区间2型模糊全局滑模控制

IF 1.9 3区工程技术

Meccanica Pub Date : 2025-02-14 DOI: 10.1007/s11012-024-01922-y

Wei Chen, Zekai Wang, Zebin Zhou

引用次数: 0

Analytical determination of critical forces during buckling of systems consisting of two pinned connected rods 由两根钉接杆组成的系统屈曲时临界力的分析测定

IF 1.9 3区工程技术

Meccanica Pub Date : 2025-02-13 DOI: 10.1007/s11012-025-01941-3

A. Shvets, K. Murawski, Y. Fedorov

{"title":"Analytical determination of critical forces during buckling of systems consisting of two pinned connected rods","authors":"A. Shvets, K. Murawski, Y. Fedorov","doi":"10.1007/s11012-025-01941-3","DOIUrl":"10.1007/s11012-025-01941-3","url":null,"abstract":"<div><p>Columns and rod systems are quite common in engineering practice. For the correct design of such structures, it is necessary to have analytical expressions for critical forces for all possible load cases. The article is devoted to a theoretical study on determining critical forces in compressed-bent rod systems in the elastic stage and checking the numerical calculation methods of such rods using the displacement method. The study examines the issues of stability of rod systems, studies the effect of the rods’ own weight, final values of possible displacements of system nodes, and the direction of distributed load on the values of compressive critical forces. A differential equation for the bending of a rod is obtained taking into account the eccentricity of the application of the axial force. As a result of theoretical studies, analytical expressions were obtained for calculating the critical axial compressive force acting on a vertical rod system. The article derives and presents analytical dependencies that determine the critical forces for a rod system resting on hinged-fixed and elastically compliant supports in a transverse direction only and without semi-rigid connections in the rotational direction. The correctness of the obtained expressions is verified based on a comparison with the results of the static method for determining the critical load. The obtained expressions for determining critical forces can be used by designers when assessing the buckling resistance of rod systems.</p></div>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":"60 2","pages":"441 - 455"},"PeriodicalIF":1.9,"publicationDate":"2025-02-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143533216","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

Influence of planet pin position errors on the fatigue reliability of planetary mechanisms for large wind turbines 行星销位置误差对大型风力发电机行星机构疲劳可靠性的影响

IF 1.9 3区工程技术

Meccanica Pub Date : 2025-02-11 DOI: 10.1007/s11012-025-01942-2

Ming Li, Zhixuan Yang, Bo Fan, Wanyu Jiang, Liyang Xie

{"title":"Influence of planet pin position errors on the fatigue reliability of planetary mechanisms for large wind turbines","authors":"Ming Li, Zhixuan Yang, Bo Fan, Wanyu Jiang, Liyang Xie","doi":"10.1007/s11012-025-01942-2","DOIUrl":"10.1007/s11012-025-01942-2","url":null,"abstract":"<div><p>Planet pin position error is a critical geometric quality characteristic that significantly influences key attributes of planetary systems, including power density, load sharing, and operational reliability. Its tolerance parameters are among the key design factors determining the fatigue reliability of planetary systems in large wind turbines. In order to analyze the mechanism of these errors on the fatigue reliability of wind turbine planetary systems, a fatigue reliability evaluation model is established based on an extension of the computational logic of the full probability formula. It considers the failure correlation among the gear teeth and the temporal sequencing of the gear teeth meshing. Starting from balancing the contradiction between evaluation accuracy and evaluation costs, a hybrid finite element simulation including planet pin position errors and planet carrier flexibility, and an accelerated lifetime test for tooth probabilistic lifetime transformation are employed to respectively provide load and strength input variables for the reliability model. In particular, the Monte Carlo method is incorporated in the simulation and analysis process to take into account the randomness of planet pin position errors and the coupling influence mechanism between the error individuals. Finally, a mapping relationship from the planet pin position tolerance to the fatigue reliability of the planetary system is established. Depending on the specific reliability requirements, the upper limit of the planet pin positional tolerance zone can be determined at an early stage of the design in order to achieve as much as possible a balance between the service reliability of the planetary system and the manufacturing economy.</p></div>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":"60 2","pages":"413 - 439"},"PeriodicalIF":1.9,"publicationDate":"2025-02-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143533133","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

Diffuse interface model for fluid lipid vesicles with area-difference elasticity 具有面积差弹性的脂质囊泡扩散界面模型

IF 2.1 3区工程技术

Meccanica Pub Date : 2025-02-10 DOI: 10.1007/s11012-025-01939-x

Matteo Bottacchiari, Mirko Gallo, Marco Bussoletti, Carlo Massimo Casciola

{"title":"Diffuse interface model for fluid lipid vesicles with area-difference elasticity","authors":"Matteo Bottacchiari, Mirko Gallo, Marco Bussoletti, Carlo Massimo Casciola","doi":"10.1007/s11012-025-01939-x","DOIUrl":"10.1007/s11012-025-01939-x","url":null,"abstract":"<div><p>Lipid bilayer membranes are fundamental biological barriers both at the cellular and sub-cellular level. They are both very stable and extremely deformable, characteristics that make membrane vesicles an efficient system for drug delivery applications. In most cases, due to the scale separation between the membrane thickness and the vesicle size, fluid lipid vesicles can be described as elastic sheets that deform as prescribed by a curvature dependent energy. At the same time, vesicle scale and membrane thickness may become simultaneously important in several key biological processes, such as vesicle fusion/fission, which are also pivotal steps for drug delivery. Recently, we provided a diffuse interface description of lipid vesicles that contains both the large scale of the vesicle and the small thickness of the membrane, allowing to account for multiscale effects in membrane fusion/fission (Bottacchiari et al. in PNAS Nexus 3:300, 2024). Here, after reviewing the main features of the approach and the related results, we analyze an additional term for the diffuse interface that takes into account the so-called area-difference elasticity, namely an energy term that considers the cost for the flip-flop motion of a lipid between the two monolayers constituting the bilayer membrane. Results are validated against those obtained with the (sharp-interface) area-difference elasticity model.</p></div>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":"60 8","pages":"2325 - 2335"},"PeriodicalIF":2.1,"publicationDate":"2025-02-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://link.springer.com/content/pdf/10.1007/s11012-025-01939-x.pdf","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145230290","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

Tension of an inflated cylindrical membrane threaded through a hole 膨胀的圆柱形膜穿过孔时的张力

IF 1.9 3区工程技术

Meccanica Pub Date : 2025-02-08 DOI: 10.1007/s11012-025-01943-1

Alexey M. Kolesnikov

引用次数: 0

Nonlinear adaptive impedance control of a haptic interaction use in endoscopic sinus surgery simulation system 非线性自适应阻抗控制在鼻窦内窥镜手术模拟系统中的应用

IF 1.9 3区工程技术

Meccanica Pub Date : 2025-02-08 DOI: 10.1007/s11012-025-01948-w

Zahra Rabieefard, Mostafa Rostami, Mohammad A. Khosravi, Soroush Sadeghnejad

{"title":"Nonlinear adaptive impedance control of a haptic interaction use in endoscopic sinus surgery simulation system","authors":"Zahra Rabieefard, Mostafa Rostami, Mohammad A. Khosravi, Soroush Sadeghnejad","doi":"10.1007/s11012-025-01948-w","DOIUrl":"10.1007/s11012-025-01948-w","url":null,"abstract":"<div><p>The bilateral teleoperation technique has garnered significant attention due to its effectiveness in performing tasks in surgical applications and simulators. The Novint Falcon robot combines affordability, haptic feedback, and versatility, making it a valuable tool for advancing haptic and teleoperation technologies. It can be used as a training simulator for otolaryngology surgery, a field that involves both hard and soft tissues, making it particularly challenging. A proper controller is essential to ensure the stability of such systems. This research proposes a robust adaptive sliding mode control approach for a one-degree-of-freedom Falcon robot. The strategy adjusts the impedance to a predefined nonlinear impedance model that approximates the properties of sino-nasal tissue. The stability of the proposed control method and the convergence of the tracking error are proven using the Lyapunov stability theorem. Simulation and experimental studies demonstrate the effectiveness of the proposed controller. Additionally, a comparison with an adaptive sliding mode controller without a robust term highlights that while both controllers achieve trajectory tracking, the proposed controller achieves significantly lower tracking errors. This error for robust adaptive control falls below 0.005 after a few seconds. However, the tracking error for adaptive control without robustness is notably larger.</p></div>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":"60 2","pages":"397 - 411"},"PeriodicalIF":1.9,"publicationDate":"2025-02-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143533277","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

Plane harmonic waves in saturated mixtures of soils 饱和混合土中的平面谐波

IF 1.9 3区工程技术

Meccanica Pub Date : 2025-02-06 DOI: 10.1007/s11012-025-01936-0

Vincenzo Giacobbe

{"title":"Plane harmonic waves in saturated mixtures of soils","authors":"Vincenzo Giacobbe","doi":"10.1007/s11012-025-01936-0","DOIUrl":"10.1007/s11012-025-01936-0","url":null,"abstract":"<div><p>In this paper we consider a saturated mixture for soils consisting of a dilatant granular medium with rigid rotating grains immersed in an incompressible fluid, under the hypothesis that the mass exchange between the phases of the mixture is non-zero, therefore it can be seen as a peculiar case of Giovine (J Solids Struct 187:3–22, 2020). For the granular constituent, we introduce two microstructural fields: the micro-spin vector and the volume fraction; the first describes the rotation of rigid grains, while the scalar models the fluctuations of voids due to the dilatancy of the granular material. For the fluid constituent, the microstructure is only scalar, represented by its volume fraction. The vectorial microstructure seems to be a novelty in these media. We choose as the system of constitutive equations the one suggested in as reported by Giovine (On adsorption and diffusion in microstructured porous media, Springer, Dordrecht, 2005), which includes diffusion and absorption phenomena. Finally, in the system of balance equations, there are four interchange terms concerning: mass, linear and micro-linear momenta and micro-angular momentum; moreover, the rules underlying the formulation of the balance laws for the mixture satisfy the three metaphysical principles of Truesdell (Rational Thermodynamics, McGraw-Hill, New York, 1969). Subsequently, we study the plane harmonic waves in the saturated granular-fluid mixture as non-trivial solutions of the system of linear differential equations, assuming that the volume microstructural wave propagates in the mixture, we obtain three longitudinal waves and three transverse waves, in both cases, two waves are mixed and one is purely microscopic: this last wave does not appear in previous model.</p></div>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":"60 2","pages":"365 - 381"},"PeriodicalIF":1.9,"publicationDate":"2025-02-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143533276","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

Deformation and mechanical properties analysis of metallic hollow spheres under quasi-static compression 准静态压缩下金属空心球的变形与力学性能分析

IF 1.9 3区工程技术

Meccanica Pub Date : 2025-02-05 DOI: 10.1007/s11012-025-01945-z

Qi Gao, Changyun Li, Ling Tang, Shaoxiang Sun, Yanbo Yao, Lei Xu

{"title":"Deformation and mechanical properties analysis of metallic hollow spheres under quasi-static compression","authors":"Qi Gao, Changyun Li, Ling Tang, Shaoxiang Sun, Yanbo Yao, Lei Xu","doi":"10.1007/s11012-025-01945-z","DOIUrl":"10.1007/s11012-025-01945-z","url":null,"abstract":"<div><p>This study investigates the deformation and mechanical behavior of metallic hollow spheres (MHSs) under quasi-static compression. Quasi-static axial compression simulations on aluminum alloy MHSs of varying diameters and wall thicknesses were conducted using ANSYS. The effects of diameter, wall thickness, and density on deformation modes, mechanical properties, and energy absorption characteristics were analyzed. The results indicate that MHSs experience three deformation stages during quasi-static compression, exhibiting both symmetric and asymmetric indentation modes. With a constant thickness-to-diameter ratio (T/D), MHSs demonstrate consistent deformation patterns and compressive strength, with load-bearing capacity influenced by both diameter and wall thickness. For a fixed diameter, wall thickness becomes the key factor determining compressive strength. Increasing wall thickness significantly enhances shell stiffness and load-bearing capacity, while reducing the risk of sidewall instability. Notably, at a T/D value of 0.03, MHSs display enhanced structural strength due to distinctive structural transformations during compression. Additionally, at a given density, MHSs with larger diameters exhibit higher load-bearing capacity, although this improvement tends to level off when density exceeds a certain threshold. The study also reveals that the initial peak load, average compression load, and energy absorption capacity of MHSs are influenced by both diameter and wall thickness, whereas energy absorption efficiency is primarily determined by the interaction between these parameters. This research provides essential theoretical support for the design and performance optimization of MHSs and offers valuable insights for applications in energy-absorbing structural design.</p></div>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":"60 2","pages":"347 - 364"},"PeriodicalIF":1.9,"publicationDate":"2025-02-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143533056","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

Structural zoom for linear composite materials based on adaptive mesh and homogenization 基于自适应网格和均匀化的线性复合材料结构变焦

IF 2.1 3区工程技术

Meccanica Pub Date : 2025-02-02 DOI: 10.1007/s11012-025-01938-y

Ali Ketata, Julien Yvonnet, Nicolas Feld, Fabrice Detrez, Augustin Parret-Freaud

{"title":"Structural zoom for linear composite materials based on adaptive mesh and homogenization","authors":"Ali Ketata, Julien Yvonnet, Nicolas Feld, Fabrice Detrez, Augustin Parret-Freaud","doi":"10.1007/s11012-025-01938-y","DOIUrl":"10.1007/s11012-025-01938-y","url":null,"abstract":"<div><p>In this work, an efficient method to investigate linear elastic fields around defects in heterogeneous structures is proposed. The technique combines the ideas of structural zoom methods, where a fine mesh is used in the vicinity of a defect, and where a coarse mesh is employed in regions far from the defect, in which a simplified model can be applied. When heterogeneous materials are involved, the coupling between the fine and coarse domains can be delicate. In this study, a fine mesh is used in a domain surrounding a defect (hole, crack, etc.) and describing explicitly the embedded heterogeneities. An adaptive mesh is used in the rest of the domain, liking the fine mesh of the zoomed region and the boundary if the structure. To take into account heterogeneities which can possibly cut the boundary of the fine mesh, non-constant homogenized properties are defined in the elements of the adaptive mesh taking into account the local underlying microstructure. As a result, solution in the fine mesh can handle effects of non-separated scales (strain gradients, boundary effects), even if large contrasts are involved. In addition to its use for studying localized defects, the potential of the technique to analyze fields in the whole structure through parallel computing is also investigated. In this case, a multi-domain version of the technique is provided, where the localization process is repeated for a decomposition of the heterogeneous structure.</p></div>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":"60 8","pages":"2223 - 2260"},"PeriodicalIF":2.1,"publicationDate":"2025-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"145230261","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 analysis and additive manufacturing of a target for nuclear physics 核物理靶材的热力学分析与增材制造

IF 1.9 3区工程技术

Meccanica Pub Date : 2025-01-29 DOI: 10.1007/s11012-024-01934-8

H. Benmansour, G. Cavoto, G. Chiarello, G. del Maso, M. Meucci, S. Milana, A. Papa, V. Pettinacci, F. Renga, P. Schwendimann, B. Vitali, C. Voena

{"title":"Thermomechanical analysis and additive manufacturing of a target for nuclear physics","authors":"H. Benmansour, G. Cavoto, G. Chiarello, G. del Maso, M. Meucci, S. Milana, A. Papa, V. Pettinacci, F. Renga, P. Schwendimann, B. Vitali, C. Voena","doi":"10.1007/s11012-024-01934-8","DOIUrl":"10.1007/s11012-024-01934-8","url":null,"abstract":"<div><p>In nuclear physics experiments, a typical engineering issue is the dissipation of heat from very small surfaces and volumes on which a significant amount of energy is thermally deposited by a small-sized beam of particles. This article describes a finite element method simulation methodology for heat dissipation and the subsequent design and development of the holder of a lithium-based target up to its construction. The target described in the paper is used to study the <span>(^7)</span>Li(p,e<span>(^+)</span>e<span>(^{-})</span>)<span>(^8)</span>Be process with the proton Cockcroft–Walton accelerator of the MEG experiment at the Paul Scherrer Institut (Villigen, Switzerland). The material of the target region crossed by the emitted e<span>(^+)</span>e<span>(^{-})</span> has to be reduced as much as possible to minimally perturb the measurement of their momenta, and a thin target is required. In order to ensure the dissipation of the thermal load on the target, an in-depth thermomechanical and structural simulation was realized using ANSYS. This allowed to verify the efficiency of the dissipation mechanisms, the maximum temperatures reached, and the thermal stress on all parts to ensure a sufficiently long lifetime of the target for the physics process measurement. To realize an optimized geometry ensuring continuity of the thermal flux—essential to dissipate the incoming power—the additive manufacturing was deemed necessary. The target support has been realized in pure copper, exploiting its excellent conductive properties and the cutting-edge additive manufacturing technologies, recently developed to overcome the inherent difficulties of Laser Powder Bed Fusion (L-PBF) technology to this material.</p></div>","PeriodicalId":695,"journal":{"name":"Meccanica","volume":"60 2","pages":"335 - 345"},"PeriodicalIF":1.9,"publicationDate":"2025-01-29","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143533117","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