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Bibliographies thématiques / Node-dependent kinematic

Littérature scientifique sur le sujet « Node-dependent kinematic »

Auteur : Grafiati

Publié le 14 mars 2023

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Articles de revues sur le sujet "Node-dependent kinematic"

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Zappino, Enrico, Guohong Li et Erasmo Carrera. « Node-dependent kinematic elements for the dynamic analysis of beams with piezo-patches ». Journal of Intelligent Material Systems and Structures 29, n^o 16 (septembre 2018) : 3333–45. http://dx.doi.org/10.1177/1045389x18798942.

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This article extends the use of one-dimensional elements with node-dependent kinematics to the dynamic analysis of beam structures with piezo-patches. Node-dependent kinematics allows the kinematic assumptions to be defined individually on each finite element node, leading to finite element models with variable nodal kinematics. Derived from Carrera unified formulation, node-dependent kinematics facilitates the mathematical refinement to an arbitrary order at any desirable region on the nodal level while keeping the compactness of the formulation. As an ideal approach to simulate structures with special local features, node-dependent kinematics has been employed to model piezo-patches in static cases. In this work, the application of node-dependent beam elements in dynamic problems is demonstrated. Node-dependent kinematics is applied to increase the numerical accuracy in the areas where the piezo-patches lie in through sufficiently refined models, while lower order assumptions are used elsewhere. The dissimilar constitutive relations of neighboring components are appropriately considered with layer-wise models. Both open- and short-circuit conditions are considered. The results are compared against those from literature. The numerical study shows that the adoption of node-dependent kinematics allows accurate results to be obtained at reduced computational costs.

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Carrera, Erasmo, Enrico Zappino et Guohong Li. « Analysis of beams with piezo-patches by node-dependent kinematic finite element method models ». Journal of Intelligent Material Systems and Structures 29, n^o 7 (23 octobre 2017) : 1379–93. http://dx.doi.org/10.1177/1045389x17733332.

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This article presents a family of one-dimensional finite element method models with node-dependent kinematics for the analysis of beam structures with piezo-patches. The models proposed are built by applying Carrera unified formulation. Carrera unified formulation permits to obtain finite element method stiffness matrices through so-called fundamental nuclei whose form is independent of the assumptions made for the displacement/electrical field over the cross section of a beam. In the previous works, uniform kinematic assumptions have been applied to all the nodes within the same element. The present contribution proposes to use different kinematics on different nodes, leading to node-dependent kinematic finite element method formulations. In such an approach, non-uniform cross sections introduced by piezo-patches can be considered. With the help of layer-wise models, piezoelectric and mechanical domains each can possess individual constitutive relations. Meanwhile, node-dependent kinematics can integrate equivalent single layer models and layer-wise models to reach an optimal balance between accuracy and use of computational resources. Static governing equations for beam elements with node-dependent kinematics accounting for electromechanical effects are derived from the principle of virtual displacements. The competence of the proposed approach is validated by comparing the obtained results with solutions taken from the literature and ABAQUS three-dimensional modelling. Both extension and shear actuation mechanisms are considered.

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Najd, Jamal, Enrico Zappino, Erasmo Carrera, Walid Harizi et Zoheir Aboura. « A Variable Kinematic Multifield Model for the Lamb Wave Propagation Analysis in Smart Panels ». Sensors 22, n^o 16 (17 août 2022) : 6168. http://dx.doi.org/10.3390/s22166168.

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The present paper assessed the use of variable kinematic two-dimensional elements in the dynamic analysis of Lamb waves propagation in an isotropic plate with piezo-patches. The multi-field finite element model used in this work was based on the Carrera Unified Formulation which offers a versatile application enabling the model to apply the desired order theory. The used variable kinematic model allowed for the kinematic model to vary in space, thereby providing the possibility to implement a classical plate model in collaboration with a refined kinematic model in selected areas where higher order kinematics are needed. The propagation of the symmetric (S0) and the antisymmetric (A0) fundamental lamb waves in an isotropic strip was considered in both mechanical and piezo-elastic plate models. The convergence of the models was discussed for different kinematics approaches, under different mesh refinement, and under different time steps. The results were compared to the exact solution proposed in the literature in order to assess and further determine the effects of the different parameters used when dynamically modeling a Lamb wave propagating in such material. It was shown that the higher order kinematic models delivered a higher accuracy of the propagating wave evaluated using the corresponding Time Of Flight (TOF). Upon using the appropriate mesh refinement of 2000 elements and sufficient time steps of 4000 steps, the error between the TOF obtained analytically and numerically using a high order kinematics was found to be less than 1% for both types of fundamental Lamb waves S0 and A0. Node-dependent kinematics models were also exploited in wave propagation to decrease the computational cost and to study their effect on the accuracy of the obtained results. The obtained results show, in both the mechanical and the piezo-electric models, that a reduction in the computational cost of up to 50% can be easily attained using such models while maintaining an error inferior to 1%.

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Zappino, E., G. Li, A. Pagani et E. Carrera. « Global-local analysis of laminated plates by node-dependent kinematic finite elements with variable ESL/LW capabilities ». Composite Structures 172 (juillet 2017) : 1–14. http://dx.doi.org/10.1016/j.compstruct.2017.03.057.

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Filippi, M., E. Carrera, D. Giusa et E. Zappino. « Node-Dependent Kinematics and Multidimensional Finite Elements for the Analysis of Single/Double Swept, Composite Helicopter Blades ». Journal of the American Helicopter Society 66, n^o 3 (1 juillet 2021) : 1–10. http://dx.doi.org/10.4050/jahs.66.032005.

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This paper deals with finite element analysis of helicopter blades with single and double swept geometries made by metallic and composite materials. First, classical and refined beam theories are combined at the element level via a nodedependent kinematic (NDK) concept, which was recently introduced by the authors. Such an NDK approach enables the accuracy/efficiency ratio of the solution to be tuned according to the level of fidelity required by the design phase. Second, one-dimensional NDK models are combined with the possibility to introduce solid elements in those regions of the blade with a sharp variation of the geometries. The numerical examples consider a swept-tip rectangular beam and a doubleswept helicopter blade with a realistic airfoil. Natural frequencies and through-the-layer stress distributions are reported to demonstrate the flexibility and computational efficiency of the proposed methodology.

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Górska, Milena, Paweł Bukrejewski et Jerzy Stobiecki. « Selected physicochemical properties of water-fuel microemulsion as an alternative fuel for diesel engine ». Archives of Automotive Engineering – Archiwum Motoryzacji 84, n^o 2 (28 juin 2019) : 45–56. http://dx.doi.org/10.14669/am.vol84.art4.

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The paper focuses on the assessment of selected physicochemical properties of microemulsion containing 5% by mass (m/m) of surface active compounds (SAC), i.e. Span20 and Crilet4 as well as 10 % (m/m) of distilled water dispersed in diesel fuel (DF). In particular temperature dependent properties such as: flash point (FP) and cold filter plugging point (CFPP) as well as lubricity, friction coefficient, corrosiveness and kinematic viscosity of tested fuels were examined. It was found that the tested surfactants and water added to DF increase microemulsion FP by 13 ºC. For this reason, it can be stated that tested microemulsion is safer than typical DF. On the other hand it was found that the CFPP of the tested microemulsion is also adequately higher. It means less usefulness of such fuel during winter periods. Based on the research results it can be stated that addition of tested surfactants slightly worsens the lubricity of DF. However, the same surfactants in the presence of dispersed water reduce the friction in the tribological node and improve the lubricity of the tested microemulsion. Research showed that tested microemulsion system is not corrosive as well as its kinematic viscosity meet requirements of EN590 standard. Based on all these findings, microemulsion is considered as safe and such fuel can be recommended for engine tests without the risk of its damage.

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Carrera, E., et E. Zappino. « One-dimensional finite element formulation with node-dependent kinematics ». Computers & ; Structures 192 (novembre 2017) : 114–25. http://dx.doi.org/10.1016/j.compstruc.2017.07.008.

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Carrera, E., S. Valvano et G. M. Kulikov. « Multilayered plate elements with node-dependent kinematics for electro-mechanical problems ». International Journal of Smart and Nano Materials 9, n^o 4 (11 septembre 2017) : 279–317. http://dx.doi.org/10.1080/19475411.2017.1376722.

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Carrera, E., A. Pagani et S. Valvano. « Multilayered plate elements accounting for refined theories and node-dependent kinematics ». Composites Part B : Engineering 114 (avril 2017) : 189–210. http://dx.doi.org/10.1016/j.compositesb.2017.01.022.

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Zappino, E., G. Li, A. Pagani, E. Carrera et A. G. de Miguel. « Use of higher-order Legendre polynomials for multilayered plate elements with node-dependent kinematics ». Composite Structures 202 (octobre 2018) : 222–32. http://dx.doi.org/10.1016/j.compstruct.2018.01.068.

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Chapitres de livres sur le sujet "Node-dependent kinematic"

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Carrera, Erasmo, et Enrico Zappino. « Node-Dependent Kinematics, Multilayered Beam, Plate, and Shell Elements ». Dans Encyclopedia of Continuum Mechanics, 1–14. Berlin, Heidelberg : Springer Berlin Heidelberg, 2018. http://dx.doi.org/10.1007/978-3-662-53605-6_141-1.

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Carrera, Erasmo, et Enrico Zappino. « Node-Dependent Kinematics, Multilayered Beam, Plate, and Shell Elements ». Dans Encyclopedia of Continuum Mechanics, 1812–24. Berlin, Heidelberg : Springer Berlin Heidelberg, 2020. http://dx.doi.org/10.1007/978-3-662-55771-6_141.

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« Node-Dependent Kinematic (NDK) ». Dans Encyclopedia of Continuum Mechanics, 1812. Berlin, Heidelberg : Springer Berlin Heidelberg, 2020. http://dx.doi.org/10.1007/978-3-662-55771-6_300459.

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Actes de conférences sur le sujet "Node-dependent kinematic"

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Zappino, Enrico, et Erasmo Carrera. « Mixed One-/Two-Dimensional Models With Node Dependent Kinematic Capabilities for the Analysis of Metallic and Composite Structures ». Dans ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-87490.

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The present paper presents an innovative approach to connect one-/two-dimensional models using a unified formulation with node-dependent kinematic capabilities. These models can use a different kinematics approximation at each node of the element. Carrera Unified Formulation has been used to derive the governing equations in a compact and general form. The possibility to connect one- and two-dimensional elements, and eventually to refine the kinematic model locally, has lead to a general reduction of the computational costs guaranteeing the same numerical accuracy.

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Carrera, Erasmo, Matteo Filippi et Enrico Zappino. « Node-Dependent Kinematic One-Dimensional Models for the Analysis of Rotating Structures ». Dans ASME 2017 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2017. http://dx.doi.org/10.1115/imece2017-71347.

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In this paper, the dynamics of rotating structures has been studied using a refined one-dimensional finite element model with a node-dependent kinematics. The present approach has been used to derive models where refined theories are used only in the region in which they are required and classical models elsewhere. This produces a reduction in the computational cost without a reduction in the accuracy of the analysis. The equations of motion have been derived in a three-dimensional fashion and they include all contributions due to the rotational speed, namely the gyroscopic, the spin softening, and the centrifugal stiffening terms. Classical and higher-order refined models have been established with the Carrera Unified Formulation. The numerical model has been assessed and then a number of applications to thin-walled structures have been proposed. The current methodology appears very effective when rotors are constituted of components with different deformability such as compact shafts and disks. The results have been compared with those obtained from uniform kinematic models and convergence analyses have been performed. The results show the efficiency of the proposed model.

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Guarnera, Daniele, Enrico Zappino, Alfonso Pagani et Erasmo Carrera. « Finite Element Models of One Dimensional Flows With Node-Dependent Accuracy ». Dans ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-86852.

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The formulation of simplified models in the description of flow fields can be highly interesting in many complex network such as the circulatory system. This work presents a refined one-dimensional finite element model with node-dependent kinematics applied to incompressible and laminar flows. In the framework of 1D-FE modelling, this methodology is a new development of the Carrera Unified Formulation (CUF), which is largely employed in structural mechanics. According to the CUF, the weak formulation of the Stokes problem is expressed in terms of fundamental nuclei and, in this novel implementation, the kinematics can be defined node by node, realizing different levels of refinements within the main direction of the pipe. Such feature allows to increase the accuracy of the model only in the areas of the domain where it is required, i.e. particular boundary condition, barriers or sudden expansion. Some typical CFD examples are proposed to validate this novel technique, including Stokes flows in uniform and non-uniform domains. For each numerical example, different combinations of 1D models have been considered to account for different kinematic approximations of flows, and in particular, models based on Taylor and Lagrange expansion have been used. The results, compared with ones obtained from uniform kinematics 1D models and with those come from available tools, highlight the capability of the proposed model in handling non-conventional boundary conditions with ease and in preserving the computational cost without any accuracy loss.

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Carrera, Erasmo, Matteo Filippi, Alfonso Pagani et Enrico Zappino. « Node-dependent kinematics, refined zig-zag and multi-line beam theories for the analysis of composite structures ». Dans 58th AIAA/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference. Reston, Virginia : American Institute of Aeronautics and Astronautics, 2017. http://dx.doi.org/10.2514/6.2017-0425.

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Petrolo, Marco, Pierluigi Iannotti, Alfonso Pagani et Erasmo Carrera. « On the Accuracy and Efficiency of Convolutional Neural Networks for Element-Wise Refinement of FEM Models ». Dans ASME 2022 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2022. http://dx.doi.org/10.1115/imece2022-93995.

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Abstract In this paper, a new methodology for the choice of the best structural theories through Machine Learning (ML) techniques is described, with a particular focus on composite shells. The identification of the most adequate theory can be operated very efficiently using Convolutional Neural Networks (CNN) as surrogate models to replicate the performances of a Finite Element (FE) formulation, although requiring only a small fraction of the usual amount of analyses. Enhanced by the introduction of the Carrera Unified Formulation (CUF), the FE Method (FEM) provides the results necessary for the training of the networks, while the Node Dependent Kinematics (NDK) approach opens to the practical implementation of local refinement capabilities. The evaluation of different structural theories is carried out with the Axiomatic/Asymptotic Method (AAM) and this can be done for both static and dynamic analyses, with The Best Theory Diagrams (BTD) being the outcome of this rating procedure. As shown in the results, CNNs can properly identify and reproduce the underlying connections between different sets of problem features and the accuracy of a given structural theory with just a very small amount of available reference data.

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