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Статті в журналах з теми "Lagrange FE"

Автор: Grafiati

Опубліковано: 25 січня 2025

Оновлено: 31 липня 2025

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1

Arcuş, Constantin M. "Mechanical systems in the generalized Lie algebroids framework." International Journal of Geometric Methods in Modern Physics 11, no. 03 (2014): 1450023. http://dx.doi.org/10.1142/s0219887814500236.

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Mechanical systems, called by use, mechanical (ρ, η)-systems, Lagrange mechanical (ρ, η)-systems or Finsler mechanical (ρ, η)-systems, are presented. The canonical (ρ, η)-semi(spray) associated to a mechanical (ρ, η)-system is obtained. New and important results are obtained in the particular case of Lie algebroids. The Lagrange mechanical (ρ, η)-systems are the spaces necessary to develop a new Lagrangian formalism. We obtain the (ρ, η)-semispray associated to a regular Lagrangian L and external force Fe and we derive the equations of Euler–Lagrange type. So, a new solution for the Weinstein'

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2

Jia, Cheng, and Hui Hui Chen. "Study of Performance of US-FE-LSPIM QUAD4 Element on Mesh Distortion." Advanced Materials Research 490-495 (March 2012): 3008–12. http://dx.doi.org/10.4028/www.scientific.net/amr.490-495.3008.

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This US-FE-LSPIM QUAD4 element is formed by using two different sets of shape functions for the trial and test functions, viz. sets of FE-LSPIM QUAD4 element shape functions and sets of classical isoparametric shape functions. For some test problems, the US-FE-LSPIM QUAD4 element has good accuracy. And by compared with FE-LSPIM QUAD4 element, the proposed element does not need to use Penalty method or Lagrange multiplier method to ensure fulfilment of exact essential boundary condition along the entire length of the edge. This paper further studies the performance of US-FE-LSPIM QUAD4 element

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3

Ivančo, Vladimír, and Martin Orečný. "Modelling a Liquid Material in Drop Test Simulations of a Cask for Liquid Radioactive Waste." Applied Mechanics and Materials 611 (August 2014): 145–55. http://dx.doi.org/10.4028/www.scientific.net/amm.611.145.

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The aim of this paper is the comparison of different material models for the simulation of fluid impact on a cask for transport of radioactive liquid material. Simulated is a 9 m drop test performed according to International Atomic Energy Agency regulations. In order to reduce computational time, proposed is to model the transported fluid as a hypothetic linearly elastic material. This enables us to use less time demanding FE explicit dynamic analysis based on Lagrange formulation only instead of combination of Lagrange and Euler formulations. Compared are the results obtained for three elast

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4

Tirvaudey, Marie, Robin Bouclier, Jean-Charles Passieux, and Ludovic Chamoin. "Non-invasive implementation of nonlinear isogeometric analysis in an industrial FE software." Engineering Computations 37, no. 1 (2019): 237–61. http://dx.doi.org/10.1108/ec-03-2019-0108.

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Purpose The purpose of this paper is to further simplify the use of NURBS in industrial environnements. Although isogeometric analysis (IGA) has been the object of intensive studies over the past decade, its massive deployment in industrial analysis still appears quite marginal. This is partly due to its implementation, which is not straightforward with respect to the elementary structure of finite element (FE) codes. This often discourages industrial engineers from adopting isogeometric capabilities in their well-established simulation environment. Design/methodology/approach Based on the con

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5

Petrolo, M., MH Nagaraj, E. Daneshkhah, R. Augello, and E. Carrera. "Static analysis of thin-walled beams accounting for nonlinearities." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 236, no. 6 (2021): 2967–80. http://dx.doi.org/10.1177/09544062211032997.

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This paper presents numerical results concerning the nonlinear analysis of thin-walled isotropic structures via 1 D structural theories built with the Carrera Unified Formulation (CUF). Both geometrical and material nonlinearities are accounted for, and square, C- and T-shaped beams are considered. The results focus on equilibrium curves, displacement, and stress distributions. Comparisons with literature and 3 D finite elements (FE) are provided to assess the formulation’s accuracy and computational efficiency. It is shown how 1 D models based on Lagrange expansions of the displacement field

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6

Gruttmann, Friedrich, and Werner Wagner. "Ein neues FE-Modell zur Berechnung von geschichteten Platten mit kontinuierlichen interlaminaren Schubspannungen/A new FE–model for the computation of layered plates with continuous interlaminar transverse shear stresses." Bauingenieur 91, no. 05 (2016): 179–87. http://dx.doi.org/10.37544/0005-6650-2016-05-39.

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In dieser Arbeit werden geschichtete Platten unter statischer Belastung betrachtet. Es wird ein Mehrfeldfunktional vorgeschlagen, dessen zugehörige Euler–Lagrange–Gleichungen neben dem Kräfte– und Momentengleichgewicht der Schnittgrößen lokale Gleichgewichtsbeziehungen in Spannungen liefert. Innerhalb eines finiten Plattenelements mit vier Knoten werden die Verwölbungen mit schichtweisen kubischen Ansatzfunktionen interpoliert. Dies hat zur Folge, dass die interlaminaren Schubspannungen automatisch kontinuierlich und die Spannungsrandbedingungen exakt erfüllt sind. Elimination der Wölb– und La

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7

Su, Wen Zheng. "Finite Element Formulation for the Vibration Analysis of Couple-Stress Continuum." Applied Mechanics and Materials 367 (August 2013): 156–60. http://dx.doi.org/10.4028/www.scientific.net/amm.367.156.

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This paper proposed a finite element formulation to analysis the vibration of couple-stress continuum. A four-node discrete couple-stress element relaxed the requirement of C1 continuity is developed. This element is modified by a bubble function, based on the classical four-ode Lagrange element. The element includes the internal bending constants and the internal initial moment of rotation. Numerical examples show that the present FE scheme is accurate for the eigenvalue analysis of couple-stress continuum structures, especially for the low order frequency analysis.

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8

González, Jose A., K. C. Park, and Ramon Abascal. "A Partitioned Formulation for FEM/BEM Coupling in Contact Problems Using Localized Lagrange Multipliers." Key Engineering Materials 618 (July 2014): 23–48. http://dx.doi.org/10.4028/www.scientific.net/kem.618.23.

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This paper presents a state-of-the-art in the use of localized Lagrange multipliers (LLMs)for 3D frictional contact problems coupling the Finite Element Method (FEM) and the BoundaryElement Method (BEM). Resolution methods for the contact problem between non-matching mesheshave traditionally been based on a direct coupling of the contacting solids using classical Lagrangemultipliers. These methods tend to generate strongly coupled systems that require a deep knowledgeof the discretization characteristics on each side of the contact zone complicating the process ofmixing different numerical tec

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9

Adhikari, Balakrishna, and B. N. Singh. "Buckling Characteristics of Laminated Functionally-Graded CNT-Reinforced Composite Plate under Nonuniform Uniaxial and Biaxial In-Plane Edge Loads." International Journal of Structural Stability and Dynamics 20, no. 02 (2019): 2050022. http://dx.doi.org/10.1142/s0219455420500224.

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In this paper, the buckling response of laminated functionally-graded CNT-reinforced composite (FG-CNTRC) plate structure is predicted under various types of non-uniform edge compression loading. For the finite element (FE) discretization of the plate, a nine degree of freedom (DOFs)-type polynomial-based higher-order shear deformation theory (HSDT) is considered. The application of non-uniform edge load causes the in-plane stress distribution to be non-uniform. Hence, the in-plane stresses need to be evaluated prior to the buckling analysis. These in-plane stresses are calculated using the in

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10

Feng, Yong, Mu Lan Wang, Bao Sheng Wang, and Jun Ming Hou. "Influence of the Process Variables on the Temperature Distribution in AISI 1045 Turning." Advanced Materials Research 557-559 (July 2012): 1364–68. http://dx.doi.org/10.4028/www.scientific.net/amr.557-559.1364.

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High-speed metal cutting processes can cause extremely rapid heating of the work material. Temperature on the machined surface is critical for surface integrity and the performance of a precision component. However, the temperature of a machined surface is challenging for in-situ measurement.So, the finite element(FE) method used to analyze the unique nonlinear problems during cutting process. In terms of heat-force coupled problem, the thermo-plastic FE model was proposed to predict the cutting temperature distribution using separated iterative method. Several key techniques such as material

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11

Allen, H. G., and R. S. Langley. "A linearised Hybrid FE-SEA analysis method for complex systems with nonlinearities under random excitation." Journal of Physics: Conference Series 2647, no. 2 (2024): 022008. http://dx.doi.org/10.1088/1742-6596/2647/2/022008.

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Abstract Within complex structures it is not uncommon for localised nonlinearities to be present, this renders conventional linear mid-high frequency analysis techniques such as the Hybrid Finite Element (FE) - Statistical Energy Analysis (SEA) method inapplicable. The development of a linearisation procedure applicable to an ensemble of random systems featuring deterministic nonlinearity is initially considered in this work, which is centred around the technique of Equivalent Linearisation. Constraining the linearisation to remain invariant across the whole ensemble, key to the linearised hyb

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12

Chen, Zixuan, Xiaoliang Song, Xuping Zhang, and Bo Yu. "A FE-ADMM algorithm for Lavrentiev-regularized state-constrained elliptic control problem." ESAIM: Control, Optimisation and Calculus of Variations 25 (2019): 5. http://dx.doi.org/10.1051/cocv/2018019.

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In this paper, Elliptic control problems with pointwise box constraints on the state is considered, where the corresponding Lagrange multipliers in general only represent regular Borel measure functions. To tackle this difficulty, the Lavrentiev regularization is employed to deal with the state constraints. To numerically discretize the resulted problem, full piecewise linear finite element discretization is employed. Estimation of the error produced by regularization and discretization is done. The error order of full discretization is not inferior to that of variational discretization becaus

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13

Wylie, Shola M., Jonathan P. Clarke, and Ortwin E. Gerhard. "The Milky Way’s middle-aged inner ring." Astronomy & Astrophysics 659 (March 2022): A80. http://dx.doi.org/10.1051/0004-6361/202142343.

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Aims. We investigate the metallicity, age, and orbital anatomy of the inner Milky Way, specifically focussing on the outer bar region. Methods. We integrated a sample of APOGEE DR16 inner Galaxy stars in a state of the art bar-bulge potential with a slow pattern speed and investigated the link between the resulting orbits and their [Fe/H] and ages. By superimposing the orbits, we built density, [Fe/H], and age maps of the inner Milky Way, which we divided further using the orbital parameters eccentricity, |Xmax|, and |Zmax|. Results. We find that at low heights from the Galactic plane, the Gal

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14

Kwon, Yun-Jae, Jin-Gyun Kim, and Wonsup Lee. "A framework for effective face-mask contact modeling based on finite element analysis for custom design of a facial mask." PLOS ONE 17, no. 7 (2022): e0270092. http://dx.doi.org/10.1371/journal.pone.0270092.

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A novel contact model is presented to efficiently solve a face-mask contact problem by using the finite element (FE) method for the optimized design of a custom facial mask. Simulation of contact pressure for various mask designs considering material properties of the face allows virtual evaluation of the suitability of a mask design for a person’s face without conducting empirical measurement of the face-mask contact pressure. The proposed contact model is accomplished by combining three approaches to reduce the calculation cost of simulating the face-mask contact: (1) use of a simplified and

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15

Wu, Jiewei, Rongjun Wu, Yuqing Wang, et al. "Prediction of Dissolved Impurities and Movement of Oxide Particles in the Primary Circuit of LBE Fast Reactor." Coatings 11, no. 10 (2021): 1263. http://dx.doi.org/10.3390/coatings11101263.

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To better understand the corrosion and corrosion products behavior in the primary circuit of lead-bismuth eutectic (LBE) coolant reactor, the concentration distribution of soluble impurities and the transport of solid particles are investigated through the finite-element method. An axisymmetric model of the primary circuit of an LBE reactor was constructed to accelerate the calculation of the thermal hydraulic filed of the circuit. The saturation concentration of solute Fe, Cr and Ni in LBE coolant are identified through the equilibrium of their oxides and PbO, and the very different saturatio

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16

Serizawa, Hisashi, Isao Shibaharar, Sherif Rashed, and Hidekazu Murakawa. "FEM Analysis of Joint Interface Formation in Magnetic Pressure Seam Welding." Materials Science Forum 638-642 (January 2010): 2166–71. http://dx.doi.org/10.4028/www.scientific.net/msf.638-642.2166.

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The magnetic pressure seam welding is one of the candidate methods to join thin sheet smart and multifunctional materials. In this research, to examine the mechanism of magnetic pressure welding from a dynamic viewpoint, numerical simulation of the impact was carried out by using a commercial Euler-Lagrange coupling software MSC.Dytran (MSC.Software) as a first step of the computational studies, where the joint between Fe and Al was employed according to the previous experimental researches. From the serial numerical results, it was found that the increase of temperature at the joint interface

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17

Fazzolari, Fiorenzo A., and Puxue Tan. "A Linearised Hybrid FE-SEA Method for Nonlinear Dynamic Systems Excited by Random and Harmonic Loadings." Vibration 3, no. 3 (2020): 304–19. http://dx.doi.org/10.3390/vibration3030021.

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The present paper proposes a linearised hybrid finite element-statistical energy analysis (FE-SEA) formulation for built-up systems with nonlinear joints and excited by random, as well as harmonic, loadings. The new formulation was validated via an ad-hoc developed stochastic benchmark model. The latter was derived through the combination of the Lagrange-Rayleigh-Ritz method (LRRM) and the Monte Carlo simulation (MCS). Within the build-up plate systems, each plate component was modelled by using the classical Kirchhoff’s thin-plate theory. The linearisation processes were carried out according

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18

Ani, Chukwuemeka Lawrence, Lawal Olumuyiwa Mashood, Joshua Yakubu Anche, Stephen Adikwu, Dimeji Ebenezer Aderupatan, and Moses Gyuknom Bart. "Crypto Assets Indicators and their Effect on the Market Capitalization: A Panel Data Analysis." Kasu Journal of Computer Science 1, no. 2 (2024): 200–217. http://dx.doi.org/10.47514/kjcs/2024.1.2.005.

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Background: In this paper, four-years (21st October, 2018 – 21st October, 2022) cryptocurrencies indicators such as OPP, CPP, HGP, LOP, and ATV for six (6) crypto assets with high market capitalization based on coin categorization/utilization were considered as explanatory (independent) variables to estimate crypto assets returns. Aim: This study seek to evaluate the relationship between crypto asset indicators and crypto market capitalization, so as to quantitatively review and establish that crypto market capitalization can easily be influenced by crypto indicators. Method: The study uses th

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19

Abdulkareem, Aveen Ahmed. "Theoretical and Experimental Stress Analysis of Cam With Simple Harmonic Motion." Journal of Engineering 22, no. 1 (2016): 198–214. http://dx.doi.org/10.31026/j.eng.2016.01.13.

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Cams are considered as one of the most important mechanical components that depends the contact action to do its job and suffer a lot of with drawbacks to be predicted and overcame in the design process. this work aims to investigate the induced cam contact and the maximum shear stress energy or (von misses) stresses during the course of action analytically using Hertz contact stress equation and the principal stress formulations to find the maximum stress value and its position beneath the contacting surfaces. The experimental investigation adopted two dimensions photoelastic technique to ana

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20

Gaidzhurov, P. P., and N. A. Saveleva. "Application of the Double Approximation Method for Constructing Stiffness Matrices of Volumetric Finite Elements." Advanced Engineering Research (Rostov-on-Don) 23, no. 4 (2023): 365–75. http://dx.doi.org/10.23947/2687-1653-2023-23-4-365-375.

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Introduction. When numerically solving problems of elasticity theory in a three-dimensional formulation by the finite element method, finite elements (FE) in the form of parallelepipeds, prisms and tetrahedra are used. Regularly, the construction of stiffness matrices of volumetric FE is based on the principle of isoparametricity, which involves the Lagrange polynomials to approximate the geometry and displacements. In computational practice, the most widespread FE are the so-called multilinear isoparametric FE with a linear law of approximation of displacements. The main disadvantage of these

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21

Yang, Dong, and Jiajian Lin. "Numerical Investigation on the Formation and Penetration Behavior of Explosively Formed Projectile (EFP) with Variable Thickness Liner." Symmetry 13, no. 8 (2021): 1342. http://dx.doi.org/10.3390/sym13081342.

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Explosively formed projectiles (EFPs) are widely used in civil applications and the military field for their excellent impact performance. How to give full play to the energy accumulation effect of explosives and improve the penetration performance has become the main problem of EFP design. The aim of the present study was to investigate the effect of liner structure on EFP formation and its penetration behavior. In order to achieve this, a finite element (FE) model was first established on the basis of the Lagrange and ALE method. Then, formation and penetration performance tests of EFP were

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22

Yang, Seung H., Kwang S. Woo, Jeong J. Kim, and Jae S. Ahn. "Finite Element Analysis of RC Beams by the Discrete Model and CBIS Model Using LS-DYNA." Advances in Civil Engineering 2021 (February 22, 2021): 1–9. http://dx.doi.org/10.1155/2021/8857491.

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There are several techniques to simulate rebar reinforced concrete, such as smeared model, discrete model, embedded model, CLIS (constrained Lagrange in solid) model, and CBIS (constrained beam in solid) model. In this study, however, the interaction between the concrete elements and the reinforcement beam elements is only simulated by the discrete model and CBIS (constrained beam in solid) model. The efficiency and accuracy comparisons are investigated with reference to the analysis results by both models provided by LS-DYNA explicit finite element software. The geometric models are created u

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23

Bacciocchi, Michele, and Angelo Tarantino. "Natural Frequency Analysis of Functionally Graded Orthotropic Cross-Ply Plates Based on the Finite Element Method." Mathematical and Computational Applications 24, no. 2 (2019): 52. http://dx.doi.org/10.3390/mca24020052.

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This paper aims to present a finite element (FE) formulation for the study of the natural frequencies of functionally graded orthotropic laminated plates characterized by cross-ply layups. A nine-node Lagrange element is considered for this purpose. The main novelty of the research is the modelling of the reinforcing fibers of the orthotropic layers assuming a non-uniform distribution in the thickness direction. The Halpin–Tsai approach is employed to define the overall mechanical properties of the composite layers starting from the features of the two constituents (fiber and epoxy resin). Sev

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24

Su, Jinpeng, Kun Zhang, Qiang Zhang, and Ying Tian. "Free and Forced Vibration of Coupled Beam Systems Resting on Variable Viscoelastic Foundations." International Journal of Structural Stability and Dynamics 20, no. 12 (2020): 2050141. http://dx.doi.org/10.1142/s0219455420501412.

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This paper presents a modified variational method for free and forced vibration analysis of coupled beam systems resting on various viscoelastic foundations. Non-uniform as well as uniform curved and straight Timoshenko beam components are considered in the coupled beam system. Using proper coordinate transformations, interactions among the beam components of the coupled beam system are accommodated by combining Lagrange multiplier method and least-square weighted residual method. Interface potential energy for various boundary conditions including the elastic ones is simultaneously formulated

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25

PERREY-DEBAIN, Emmanuel, Alexandre BERTHET, Jean-Daniel CHAZOT, and Sylvain GERMèS. "Dynamic substructuring for visco-elastic materials using a POD-based model reduction method: application to laminated panels." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 270, no. 3 (2024): 8844–51. http://dx.doi.org/10.3397/in_2024_4149.

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Dynamic substructuring is now a well established and powerful tool for engineers used to analyze the dynamic response of mechanical systems. The technique is particularly favored for the simulation of mechanical vibrations allowing different aspects to be studied. It consists in splitting the global structure into several substructures from which reduced models are built. In Finite Element software, these reduced models, also called superelements, are generally built using the concept of Component Mode Synthesis. Difficulties arise when structures made of frequency-dependent materials are cons

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26

Casciaro, José María. "Jean GUITTON, Retrato del Padre Lagrange. El que reconcilió la ciencia con la fe, Ed. Palabra, Madrid 1993, 185 pp., 14, 5 x 22, 2." Scripta Theologica 26, no. 3 (2018): 1222–23. http://dx.doi.org/10.15581/006.26.17407.

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27

Mironov, М. Yu. "Optimization of multi-element models of structures with integral constraints on unsteady responses." Transactions of the Krylov State Research Centre 2, no. 400 (2022): 79–88. http://dx.doi.org/10.24937/2542-2324-2022-2-400-79-88.

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Анотація:

Object and purpose of research. The study focuses on management of dynamic parameters of structures, the load on which has unsteady character in accordance with a given frequency spectrum. Based on the earlier obtained [8, 15] matrix relations of sensitivity analysis, effective design iteration algorithms, which satisfy Kuhn–Tucker optimum conditions, are developed and implemented in software. Materials and methods. The methods used are a displacement method version of the beam finite-element technique, analytical and semi-analytical methods of taking a derivative with respect to frequencies,

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28

Li, Yang, Chunlan Jiang, Liang Mao, and Ming Li. "Study on Transient Dynamics and Aerodynamic Characteristics of a New Type of High-Damping Four-Winged Rotating Parachute Inflation Process." Mathematical Problems in Engineering 2020 (March 19, 2020): 1–20. http://dx.doi.org/10.1155/2020/2361534.

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To decrease the opening shock as well as improve the resistance coefficient and stability of the parachute of aviation weapon under subsonic conditions, a new kind of high-damping four-winged rotating (HFWR) parachute is investigated in this paper. The transient dynamic behavior and aerodynamic characteristics of the parachute during the inflation process are studied. Considering the permeability, the 3D folded finite element (FE) model of the HFWR parachute is established based on the direct folding modeling technique, and the inflation process of the parachute under subsonic flow is simulate

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29

Hmoad, Nassear Rasheid, and Mohammad Qasim Abdullah. "Analytical and Numerical Tooth Contact Analysis (TCA) of Standard and Modified Involute Profile Spur Gear." Journal of Engineering 22, no. 3 (2016): 111–28. http://dx.doi.org/10.31026/j.eng.2016.03.08.

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Among all the common mechanical transmission elements, gears still playing the most dominant role especially in the heavy duty works offering extraordinary performance under extreme conditions and that the cause behind the extensive researches concentrating on the enhancement of its durability to do its job as well as possible. Contact stress distribution within the teeth domain is considered as one of the most effective parameters characterizing gear life, performance, efficiency, and application so that it has been well sought for formal gear profiles and paid a lot of attention for moderate

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30

Río-Martín, Laura, Saray Busto, and Michael Dumbser. "A Massively Parallel Hybrid Finite Volume/Finite Element Scheme for Computational Fluid Dynamics." Mathematics 9, no. 18 (2021): 2316. http://dx.doi.org/10.3390/math9182316.

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In this paper, we propose a novel family of semi-implicit hybrid finite volume/finite element schemes for computational fluid dynamics (CFD), in particular for the approximate solution of the incompressible and compressible Navier-Stokes equations, as well as for the shallow water equations on staggered unstructured meshes in two and three space dimensions. The key features of the method are the use of an edge-based/face-based staggered dual mesh for the discretization of the nonlinear convective terms at the aid of explicit high resolution Godunov-type finite volume schemes, while pressure te

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31

Schneider, Teseo, Yixin Hu, Xifeng Gao, Jérémie Dumas, Denis Zorin, and Daniele Panozzo. "A Large-Scale Comparison of Tetrahedral and Hexahedral Elements for Solving Elliptic PDEs with the Finite Element Method." ACM Transactions on Graphics 41, no. 3 (2022): 1–14. http://dx.doi.org/10.1145/3508372.

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The Finite Element Method (FEM) is widely used to solve discrete Partial Differential Equations (PDEs) in engineering and graphics applications. The popularity of FEM led to the development of a large family of variants, most of which require a tetrahedral or hexahedral mesh to construct the basis. While the theoretical properties of FEM basis (such as convergence rate, stability, etc.) are well understood under specific assumptions on the mesh quality, their practical performance, influenced both by the choice of the basis construction and quality of mesh generation, have not been systematica

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Metta Susanti and Aldi Samara. "PENGARUH QUICK RATIO, CURRENT RATIO TERHADAP UKURAN PERUSAHAAN STUDI EMPIRIS PADA PERUSAHAAN SEKTOR INDUSTRI DASAR KIMIA SUB SEKTOR PAKAN TERNAK YANG TERDAFTAR DI BURSA EFEK INDONESIA." CEMERLANG : Jurnal Manajemen dan Ekonomi Bisnis 2, no. 4 (2022): 28–42. http://dx.doi.org/10.55606/cemerlang.v2i4.427.

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Terdapat fenomena penelitian ini yaitu : Diluncurkan bank pakan untuk meningkatkan kualitas dan produksi ternak, Impor gandum menjadi opsi alternatif yang diberikan pemerintah untuk menghadapi risiko kenaikan harga pakan, Memastikan dua perusahaan (PT Japfa Comfeed dan PT Charoen Pokphand (CP) Indonesia) menyerap jagung dari petani dan stoknya tercukupi saat panen raya, diharapkan harga jagung tidak anjlok dan berada pada titik keseimbangannya seperti biasanya, dan Pakan ternak diprediksi mengalami kenaikan pada periode kuartal akhir dan menariknya saham JPFA dan MAIN. Dari fenomena diatas, ma

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Trevilato, Thales R. B., Aldemir Ap Cavallini Jr, and Valder Steffen Jr. "Analysis of the dynamic behavior of onboard rotors in non-linear regimes under the influence of parametric uncertainties." Mechanics & Industry 26 (2025): 23. https://doi.org/10.1051/meca/2025011.

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In recent decades, a significant advance in the understanding of the dynamic behavior of rotors has been observed, including the capacity to model and forecast the physical behavior of these systems. The emergence of novel applications seeks to optimize performance and cost-effectiveness maintaining safe operating conditions and pushing rotating systems to their limits. Therefore, this contribution presents a combined numerical and experimental investigation of the nonlinear behavior exhibited by rotating systems subjected to base excitations. A comprehensive model incorporates nonlinear behav

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STRAMANDINOLI, R. S. B., and H. L. LA ROVERE. "Finite Element Model for Nonlinear Analysis of Reinforced Concrete Beams and Plane Frames." Revista IBRACON de Estruturas e Materiais 10, no. 2 (2017): 386–414. http://dx.doi.org/10.1590/s1983-41952017000200008.

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Abstract In this work, a two-dimensional finite element (FE) model for physical and geometric nonlinear analysis of reinforced concrete beams and plane frames, developed by the authors, is presented. The FE model is based on the Euler-Bernoulli Beam Theory, in which shear deformations are neglected. The bar elements have three nodes with a total of seven degrees of freedom. Three Gauss-points are utilized for the element integration, with the element section discretized into layers at each Gauss point (Fiber Model). It is assumed that concrete and reinforcing bars are perfectly bonded, and eac

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Latif, R. F., M. K. A. Khan, A. Javed, S. I. A. Shah, and S. T. I. Rizvi. "A semi-analytical approach for flutter analysis of a high-aspect-ratio wing." Aeronautical Journal 125, no. 1284 (2020): 410–29. http://dx.doi.org/10.1017/aer.2020.71.

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AbstractWe present a hybrid, semi-analytical approach to perform an eigenvalue-based flutter analysis of an Unmanned Aerial Vehicle (UAV) wing. The wing has a modern design that integrates metal and composite structures. The stiffness and natural frequency of the wing are calculated using a Finite Element (FE) model. The modal parameters are extracted by applying a recursive technique to the Lanczos method in the FE model. Subsequently, the modal parameters are used to evaluate the flutter boundaries in an analytical model based on the p-method. Two-degree-of-freedom bending and torsional flut

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Yao, X., X. Guo, Y. Feng, and C. Yu. "Research on the uprising dynamics of a double-carriage overhead crane system." Proceedings of the Institution of Mechanical Engineers, Part C: Journal of Mechanical Engineering Science 225, no. 1 (2011): 112–22. http://dx.doi.org/10.1177/09544062jmes2131.

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The dynamic characteristics, in the uprising phase, of an overhead crane carrying two carriages and a cylindrical payload are studied in this article. The crane system investigated mainly consists of a twin beam, two carriages, a rigid payload, and two wire ropes. A new analytical model, in which the beam, carriages, payload, and wire ropes are, respectively, considered as uniform Euler—Bernoulli beam, lumped masses, rigid body, and springs, is presented to describe the uprising dynamics of the specific crane system. The most distinguished characteristic of the model is the dynamic coupling de

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Maldavsky, Aliocha. "Financiar la cristiandad hispanoamericana. Inversiones laicas en las instituciones religiosas en los Andes (s. XVI y XVII)." Vínculos de Historia. Revista del Departamento de Historia de la Universidad de Castilla-La Mancha, no. 8 (June 20, 2019): 114. http://dx.doi.org/10.18239/vdh_2019.08.06.

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RESUMENEl objetivo de este artículo es reflexionar sobre los mecanismos de financiación y de control de las instituciones religiosas por los laicos en las primeras décadas de la conquista y colonización de Hispanoamérica. Investigar sobre la inversión laica en lo sagrado supone en un primer lugar aclarar la historiografía sobre laicos, religión y dinero en las sociedades de Antiguo Régimen y su trasposición en América, planteando una mirada desde el punto de vista de las motivaciones múltiples de los actores seglares. A través del ejemplo de restituciones, donaciones y legados en losAndes, se

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Suttmeier, F. T. "Localised FE-analysis of Strang's problem based on Lagrange techniques." Journal of Numerical Mathematics 18, no. 2 (2010). http://dx.doi.org/10.1515/jnum.2010.006.

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Enomoto, Shota, Shunya Furuuchi, Tatsuki Ishibashi, Shu Yamada, and Toshiaki Oda. "Degree of twist in the Achilles tendon interacts with its length and thickness in affecting local strain magnitude: a finite element analysis." Frontiers in Bioengineering and Biotechnology 12 (October 31, 2024). http://dx.doi.org/10.3389/fbioe.2024.1445364.

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IntroductionThe relationship between the twisting of the three subtendons of the Achilles tendon (AT) and local strain has received attention in recent years. The present study aimed to elucidate how the degree of twist in the AT affects strain using finite element (FE) analysis, while also considering other geometries (e.g., length, thickness, and width) and their combinations.MethodsA total of 59 FE models with different degrees of twist and geometries were created. A lengthening force (z-axis) of 1,000 N was applied to each subtendon (total: 3,000 N). The average value of the first principa

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Rolf, Kothari, and Krause Hardik. "A multigrid technique for Lagrange multiplier-based unfitted Finite Element contact issues." International Journal of Advanced Science and Computer Applications 2, no. 2 (2023). http://dx.doi.org/10.47679/ijasca.v2i2.22.

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Internal interfaces in a domain could exist as a material defect or they can appear due to propagations of cracks. Discretization of such geometries and solution of the contact problem on the internal interfaces can be computationally challenging. We employ an unfitted Finite Element (FE) framework for the discretization of the domains and develop a tailored, globally convergent, and efficient multigrid method for solving contact problems on the internal interfaces. In the unfitted FE methods, structured background meshes are used and only the underlying finite element spaces are modified to i

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Ali, Ali Mohammed, Manar Hamid Jasim, and Bashar Dheyaa Hussein Al-Kasob. "Low velocity impact study of a sandwich beams using Ritz method and finite element modelling." Journal of Engineering, Design and Technology, February 2, 2022. http://dx.doi.org/10.1108/jedt-10-2021-0584.

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Purpose The purpose of this paper is to present an applied method to design the low-speed contact between a mass and surface of a beam using an analytical solution based on the first-order shear deformation beam theory. Also, a simulation of impact process is carried out by ABAQUS finite element (FE) code. Design/methodology/approach In theoretical formulation, first strains and stresses are obtained, then kinetic and potential energies are written, and using a combination of Ritz and Lagrange methods, a set of system of motion equations in the form of mass, stiffness and force matrices is obt

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Abdelrahman, Alaa A., Ahmed G. El-Shafei, and Fatin F. Mahmoud. "Analysis of Steady-State Rolling Contact Problems in Nonlinear Viscoelastic Materials." Journal of Tribology 137, no. 3 (2015). http://dx.doi.org/10.1115/1.4029938.

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A comprehensive numerical model is developed using Lagrangian finite element (FE) formulation for investigating the steady-state viscoelastic (VE) rolling contact response. Schapery's nonlinear viscoelastic (NVE) model is adopted to simulate the VE behavior. The model accounts for large displacements and rotations. A spatially dependent incremental form of the VE constitutive equations is derived. The dependence on the history of the strain rate is expressed in terms of the spatial variation of the strain. The Lagrange multiplier approach is employed. The classical Coulomb's friction law is us

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Patil, Santosh S., Saravanan Karuppanan, and Ivana Atanasovska. "Contact Stress Evaluation of Involute Gear Pairs, Including the Effects of Friction and Helix Angle." Journal of Tribology 137, no. 4 (2015). http://dx.doi.org/10.1115/1.4030242.

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The aim of this technical brief is to provide a new viewpoint of friction factor for contact stress calculations of gears. The idea of friction factor has been coined, for the calculation of contact stresses along the tooth contact for different helical gear pairs. Friction factors were developed by evaluating contact stresses with and without friction for different gear pairs. In this paper, three-dimensional (3D) finite element method (FEM) and Lagrange multiplier algorithm have been used to evaluate the contact stresses. Initially, a spur gear finite element (FE) model was validated with th

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Kumar, Ashu, Gurinder Singh Brar, and Prem Singh. "Development and validation of finite element model of dissimilar friction crush welding for automotive applications." Proceedings of the Institution of Mechanical Engineers, Part L: Journal of Materials: Design and Applications, October 18, 2024. http://dx.doi.org/10.1177/14644207241290033.

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Several present-day applications require the joining of dissimilar materials by solid-state processes. Aluminum-stainless steel sheet metal joining finds its application in the Automotive industry. In present work, two dissimilar sheet metal workpieces of Aluminium and Stainless Steel were joined with a newly developed Friction Crush Welding (FCW) process. Macro-structure images along with an X-ray diffraction (XRD) pattern were used to investigate the prepared samples, and a hook-like structure was found along with a U-shaped interface and intermetallic phases such as FeAl2, Fe2Al5, FeAl3, Al

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Li, Tong, Zebei Mao, Yongming Cai, Bo Wang, and Liang Chen. "A Multi-Dimensional Lagrange Multiplier Method to Identify the Load Distribution on 3D Special-Shaped Surface in the Strength Analysis of Aircraft Structure." International Journal of Computational Methods, January 9, 2023. http://dx.doi.org/10.1142/s0219876222500542.

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In the process of aircraft structural design, the aerodynamic load and inertial load need to be distributed from single loading points to distributed finite element (FE) nodes before strength analysis. The most commonly used loading distribution method is a Multi-Point Arrangement (MPA) method, which introduces a one-dimensional Lagrange multiplier based on the principle of minimum deformation energy, and simplifies the special-shaped 3D surface in aircraft structure to a plane. However, the actual aircraft structure contains a large number of special-shaped surfaces, and the MPA method cannot

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Zhang, Ning, Hong Zheng, Chi Yuan, and Wenan Wu. "A direct solution to linear constraints in the finite element analysis and its application illustrations." Engineering Computations, October 3, 2023. http://dx.doi.org/10.1108/ec-06-2022-0400.

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PurposeThis article aims to present a direct solution to handle linear constraints in finite element (FE) analysis without penalties or the Lagrange multipliers introduced.Design/methodology/approachFirst, the system of linear equations corresponding to the linear constraints is solved for the leading variables in terms of the free variables and the constants. Then, the reduced system of equilibrium equations with respect to the free variables is derived from the finite-dimensional virtual work equation. Finally, the algorithm is designed.FindingsThe proposed procedure is promising in three ty

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Aloqaily, Ahmad, P. Agilan, K. Julietraja, S. Annadurai, and Nabil Mlaiki. "A novel stability analysis of functional equation in neutrosophic normed spaces." Boundary Value Problems 2024, no. 1 (2024). http://dx.doi.org/10.1186/s13661-024-01854-2.

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AbstractThe analysis of stability in functional equations (FEs) within neutrosophic normed spaces is a significant challenge due to the inherent uncertainties and complexities involved. This paper proposes a novel approach to address this challenge, offering a comprehensive framework for investigating stability properties in such contexts. Neutrosophic normed spaces are a generalization of traditional normed spaces that incorporate neutrosophic logic. By providing a systematic methodology for addressing stability concerns in neutrosophic normed spaces, our approach facilitates enhanced underst

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Kumar, Vikash, Subrata Kumar Panda, Madhuresh Dwivedi, S. R. Mahmoud, and Mohammed Balubaid. "Nonlinear Modal Responses of Damaged Shell Structures: Numerical Prediction and Experimental Validation." AIAA Journal, February 27, 2023, 1–10. http://dx.doi.org/10.2514/1.j062679.

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The nonlinear finite element (FE) modeling approach has been adopted to model and predict the modal responses of the combined damaged (crack and delamination) layered shell structures. The damaged panel structure has been constructed mathematically using a circular meshing approach of the FE technique to include the crack. Similarly, the sublaminate approach has being used to introduce delamination of the layered structure on a mutual center. The structural distorted geometry and the deformations were modeled through the full geometrical nonlinear strain-displacement (Green–Lagrange) relations

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Kar, V. R., and S. K. Panda. "Nonlinear Thermomechanical Behavior of Functionally Graded Material Cylindrical/Hyperbolic/Elliptical Shell Panel With Temperature-Dependent and Temperature-Independent Properties." Journal of Pressure Vessel Technology 138, no. 6 (2016). http://dx.doi.org/10.1115/1.4033701.

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In this article, the nonlinear bending behavior of functionally graded (FG) curved (cylindrical, hyperbolic, and elliptical) panel is investigated under combined thermomechanical loading. In this study, two temperature fields (uniform and linear) across the thickness of shell panel are considered. The panel model is developed mathematically using higher-order shear deformation midplane kinematics with Green–Lagrange-type nonlinear strains. The individual constituents of functionally graded material (FGM) are assumed to be temperature-dependent (TD) and graded continuously using the power-law d

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Kumar, Ashu, and Gurinder Singh Brar. "Experimental and numerical investigations into friction crush welding of aluminum and magnesium sheet metals for lightweight vehicle applications." Proceedings of the Institution of Mechanical Engineers, Part E: Journal of Process Mechanical Engineering, June 4, 2025. https://doi.org/10.1177/09544089251343992.

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In recent years, the process of joining different materials has received much attention. This article investigates friction crush welding (FCW) of aluminum and magnesium sheet metals through numerical modeling and experimentation. A three-dimensional, explicit nonlinear finite element (FE) model was developed in ABAQUS utilizing the Lagrange technique. The influence of welding parameter impact like rotational speed (2700, 3500, and 5400 r/min) and welding speed (40, 50, and 60 mm/min) is also examined. The FE model was validated using experimental data from infrared thermography. The observed

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