Articles de revues : « Simplified FE model »

1

Liu, Zhiyuan, Hongseng Zou, Miao Hui, Chen Dapeng et Guo Lin. « Dynamic Finite Element Model Updating for On-load Tap Changer based on Super-model ». MATEC Web of Conferences 256 (2019) : 04001. http://dx.doi.org/10.1051/matecconf/201925604001.

Texte intégral

Résumé :

A method is presented for dynamic model updating of on-load tap changer (OLTC). Based on a sensitivity-based optimization method, the initial simplified finite element (FE) model of OLTC component is updated using the analytical results of the FE super-model. The objective of model updating is to reduce the frequency difference between the simplified FE model and the super-model, and to make the simplified model accurately represent dynamic characteristics of the super-model. The updated simplified models can be further used in the modeling and analysis of the whole OLTC model. The results, taking the base of OLTC as example, indicate that the dynamic behavior of the updated simplified model match well with that of the super-model. Subsequently, the dynamic behavior of OLTC assembled with the updated parts is further predicted by modal analysis. The presented method improves the calculation efficiency, as well as accuracy, which has broad application prospects for dynamic prediction of complex structures in engineering.

Styles APA, Harvard, Vancouver, ISO, etc.

2

Šedek, Jakub, et Roman Růžek. « Magna-Lok rivet joint and the stiffness-equivalent FE model ». Aircraft Engineering and Aerospace Technology 91, n^o 6 (10 juin 2019) : 834–42. http://dx.doi.org/10.1108/aeat-07-2018-0188.

Texte intégral

Résumé :

Purpose The purpose of this paper is to present a methodology for the determination of the stiffness when using simplified substitutive model of the joint. The usage of detailed finite element (FE) model of the joint in complex assemblies is not convenient; therefore, the substitutive model of the joint is used in FE models. Design/methodology/approach The detailed and simplified FE model of the joint is created in ABAQUS software and the analysis as well. The results of displacements are used for the determination of the stiffness of connecting element in simplified substitutive FE model. The approach is presented based on the general view on the different regions in the joint. Findings A simple FE modelling approach for the joint including the equivalent stiffness is presented. The particular solution is performed for Magna-Lok type of the rivet. The results show the same displacement for the detailed and simplified FE models. The analytical formula for stiffness determination in the load case with minimal secondary bending is introduced. Practical implications The approach for stiffness determination is straightforward and so no stiffness “tuning” is necessary in the simplified FE model. Originality/value The new approach for definition of simple FE model of the joint is introduced. It is not necessary to model a complex structure with detailed joints. The equivalent stiffness can be determined by presented procedure for every joint without limitation of the type.

Styles APA, Harvard, Vancouver, ISO, etc.

3

Jang, Beom-Seon, Jae-Hoon Jung et Yong-Suk Suh. « Use of a 3D compartment model for simplified full ship FE model. Part II : validation of the simplified FE model ». Journal of Marine Science and Technology 13, n^o 4 (23 juillet 2008) : 408–15. http://dx.doi.org/10.1007/s00773-008-0008-3.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

4

Deng, Gongxun, Yong Peng, Lin Hou, Zhixiang Li, Benhuai Li, Chao Yu et Ciaran Simms. « A Novel Simplified FE Rail Vehicle Model in Longitudinal and Lateral Collisions ». Machines 10, n^o 12 (14 décembre 2022) : 1214. http://dx.doi.org/10.3390/machines10121214.

Texte intégral

Résumé :

It is a challenge to efficiently and accurately predict train dynamic responses during complex collisions. In this paper, a novel numerical simplification method for high-speed rail vehicles during complex impact configurations is proposed. The central section of high-speed rail vehicles is a sandwich corrugated hollow double-shell structure. Starting with a baseline detailed finite element (FE) model of a high-speed train, the central section was first simplified as a solid single-shell structure. A parametric study with various simplification thickness ratios of the simplified FE rail vehicle model in different longitudinal rigid-wall collisions and lateral rigid-cylinder impacts was then performed using LS-DYNA. Furthermore, a correlation and analysis (CORA) objective rating method was used to evaluate the related responses between the simplified and detailed baseline FE rail vehicle models. The results demonstrate that the simplified FE model could effectively predict the rail vehicle impact responses. The displacement and impact force time histories of the simplified vehicle model with a thickness ratio of 0.38 matched closely with the results of the baseline detailed FE model under both longitudinal and lateral impacts (total combined CORA rating score: 93%). The rail vehicle impact deformations of the simplified vehicle model were similar to those of the baseline detailed model. The application of the simplified vehicle FE model substantially reduced the computational time (approximately 55% reduction). This work provides a solid basis for efficiently exploring train impact responses in complex collisions, and will be especially useful for train occupant injury assessment.

Styles APA, Harvard, Vancouver, ISO, etc.

5

Cotsovos, D. M., et M. N. Pavlović. « Simplified FE model for RC structures under earthquakes ». Proceedings of the Institution of Civil Engineers - Structures and Buildings 159, n^o 2 (avril 2006) : 87–102. http://dx.doi.org/10.1680/stbu.2006.159.2.87.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

6

Jang, Beom-Seon, Jae-Hoon Jung et Yong-Suk Suh. « Use of 3D compartment model for simplified full ship FE model. Part I : construction of FE model ». Journal of Marine Science and Technology 13, n^o 2 (mai 2008) : 154–63. http://dx.doi.org/10.1007/s00773-008-0274-0.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

7

Xu, Tao, Liang Hao, Yi Wen Li et Qiang Li. « Research of Simplified B Pillar Model for Roof Crashworthiness ». Applied Mechanics and Materials 34-35 (octobre 2010) : 404–9. http://dx.doi.org/10.4028/www.scientific.net/amm.34-35.404.

Texte intégral

Résumé :

The B pillar structure, which affects automotive roof crashworthiness, must have a perfect surrogate model to satisfy the early design demands. This work aims to explore the proper approach of simplified model construction. To create the simplified B pillar, the collapse theories of thin-walled hexagonal and channel beams under bending collapse are reviewed and applied to simulate the deforming behavior. Meanwhile, the simplified model is constructed from parallel connection of curved hexagonal and channel section beams. After distributing different rotational nonlinear springs, the same crashworthiness analyses are performed on both simplified and initial FE models to verify the simplified effects. The results demonstrate the potential of the approach and process proposed in developing the simplified model for the concept design of autobody.

Styles APA, Harvard, Vancouver, ISO, etc.

8

Wang, Zhihao, Xin Qi, Youkun Huang, Buqiao Fan et Xiaoke Li. « Dynamic Behavior of a Suspended Steel Space Frame-Glass Composite Floor ». Advances in Civil Engineering 2021 (29 octobre 2021) : 1–14. http://dx.doi.org/10.1155/2021/8382585.

Texte intégral

Résumé :

This study investigates the dynamic performance of a large-span suspended steel space frame-glass composite floor (SSSF-GCF). Both the ambient vibration and the human-induced vibration of the floor were experimentally measured to identify vertical dynamic characteristics and evaluate vibration serviceability of the floor. Although vertical dynamic characteristics of the floor based on the global simplified finite element (FE) model of the structure agree well with those identified via experimental modal analysis, the global simplified FE model significantly underestimates vertical vibration amplitudes of the floor due to the coupled effect between two layers. Accordingly, an equivalent local FE model of the floor system was proposed and updated via adjusting the vertical stiffness of the interstory hanging pillars. It is shown that the equivalent local FE model can well predict both the dynamic characteristics and human-induced vibration response of the floor. Finally, the effect of the damping ratio on the acceleration response of the floor was numerically demonstrated with the verified local FE model.

Styles APA, Harvard, Vancouver, ISO, etc.

9

Lu, C. L., T. X. Wu, J. G. Yu et Q. T. Ye. « On torsional stiffness and natural frequency of bellows ». Proceedings of the Institution of Mechanical Engineers, Part C : Journal of Mechanical Engineering Science 218, n^o 3 (1 mars 2004) : 263–71. http://dx.doi.org/10.1243/095440604322900390.

Texte intégral

Résumé :

Simplified formulae for torsional natural frequencies of bellows are developed using an equivalent thin-walled pipe model. To do this the torsional stiffness of bellows needs to be worked out. The torsional stiffness of bellows is determined using Chien's integration method. Accordingly, the Expansion Joint Manufactures Association (EJMA) formula for torsional stiffness calculation is modified using two different equivalent radii. The torsional natural frequencies of bellows are calculated using the simplified formulae based on the equivalent thin-walled pipe model and the modified formulae for torsional stiffness of bellows. The results from the simplified formuale are verified by those from a finite element (FE) model and good agreement is shown between the simplified formulae and the FE model.

Styles APA, Harvard, Vancouver, ISO, etc.

10

Zhang, Yongjie, Yingjie Huang, Zhiwen Li, Ke Liang, Kang Cao et Yazhou Guo. « A Simplified FE Modeling Strategy for the Drop Process Simulation Analysis of Light and Small Drone ». Aerospace 8, n^o 12 (9 décembre 2021) : 387. http://dx.doi.org/10.3390/aerospace8120387.

Texte intégral

Résumé :

The numerical accuracy of drop process simulation and collision response for drones is primarily determined by the finite element modeling method and simplified method of drone airframe structure. For light and small drones exhibiting diverse shapes and configurations, mixed materials and structures, deformation and complex destruction behaviors, the way of developing a reasonable and easily achieved high-precision simplified modeling method by ensuring the calculation accuracy and saving the calculation cost has aroused increasing concern in impact dynamics simulation. In the present study, the full-size modeling and simplified modeling methods that are specific to different components of a relatively popular light and small drone were analyzed in an LS-DYNA software environment. First, a full-size high-precision model of the drone was built, and the model accuracy was verified by performing the drop tests at the component level as well as the whole machine level. Subsequently, based on the full-size high-precision model, the property characteristics of the main components of the light and small drone and their common simplification methods were classified, a series of simplified modeling methods for different components were developed, several single simplified models and combined simplified models were built, and a method to assess the calculation error of the peak impact load in the simplified models was proposed. Lastly, by comparing and analyzing the calculation accuracy of various simplified models, the high-precision simplified modeling strategy was formulated, and the suggestions were proposed for the impact dynamics simulation of the light and small drone falling. Given the analysis of the calculation scale and solution time of the simplified model, the high-precision simplified modeling method developed here is capable of noticeably reducing the modeling difficulty, the solution scale and the calculation time while ensuring the calculation accuracy. Moreover, it shows promising applications in several fields (e.g., structure design, strength analysis and impact process simulation of drone).

Styles APA, Harvard, Vancouver, ISO, etc.

11

Shin, Chow Shing, Q. M. Chang et Chun Pin Lin. « A Critical Analysis on the Cyclic Fatigue Testing of Rotary Endodontic Instrument ». Applied Mechanics and Materials 431 (octobre 2013) : 82–87. http://dx.doi.org/10.4028/www.scientific.net/amm.431.82.

Texte intégral

Résumé :

Cyclic fatigue of rotary endodontic instruments has been tested using different techniques while the results were normally compared in terms of a canal curvature radiusRand an angular extent of instrument insertionθ. In this work, the effects of canal geometry and analysis method have been investigated by finite element (FE) analysis. A highly simplified FE model has been proposed and verified experimentally. Results from a detailed finite element (FE) model and a simple geometric model are discussed in the light of the simplified model results. It was found that the commonly used (R,θ) alone cannot quantify the severity of bending. The diameters and taper development of the canal and the instrument also played important roles. The simple geometric model can give unacceptable errors and cannot only be employed forensically. The detailed finite element model is much more resource consuming than the current simplified model and the extra effort is not worthwhile if only the bending strain is needed for correlation and prediction of instrument fatigue life.

Styles APA, Harvard, Vancouver, ISO, etc.

12

Liu, Taiyou, Xinbo Ma, Pak Kin Wong, Jing Zhao, Zhengchao Xie et V. A. Melo Cristino. « A Simplified Finite Element Approach for Modeling of Multilayer Plates ». Shock and Vibration 2019 (10 février 2019) : 1–7. http://dx.doi.org/10.1155/2019/7295615.

Texte intégral

Résumé :

The multilayer plate has a great potential for automotive and aerospace applications. However, the complexity in structure and calculation of the response impede the practical applications of multilayer plates. To solve this problem, this work proposes a new plate finite element and a simplified finite element (FE) model for multilayer plates. The proposed new plate finite element consists of the shear and extension strains in all layers. The multilayer structure with the proposed new plate finite element is regarded as a reference to calculate the reference value of the transverse response. The simplified FE model of multilayer plates is proposed based on the equivalent bending stiffness by curve fitting of the reference value of the transverse response. Numerical study shows that this approach can be used to set up the simplified FE model of multilayer plates.

Styles APA, Harvard, Vancouver, ISO, etc.

13

Yang, Xin, Yong Xia et Qing Zhou. « A simplified FE model for pull-out failure of spot welds ». Engineering Fracture Mechanics 77, n^o 8 (mai 2010) : 1224–39. http://dx.doi.org/10.1016/j.engfracmech.2010.02.029.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

14

Chen, Keyu, Marcus Hartwig et Shahram Amoozegar. « Electric machine noise and vibration prediction and validation through test ». INTER-NOISE and NOISE-CON Congress and Conference Proceedings 264, n^o 1 (24 juin 2022) : 309–16. http://dx.doi.org/10.3397/nc-2022-735.

Texte intégral

Résumé :

In this paper, a finite element (FE) simulation process for the NVH prediction of electric motors is proposed. The proposed process first simulates the motor excitation forces using a 2D electromagnetic force model which is derived from Maxwell and then it applies these forces to a simplified 3D electric machine model. This simplified 3D model is validated by comparing the structural transfer functions calculated from impact hammer test and FE simulation. Finally, the proposed simulation process is validated by comparing predicted sound pressure levels at different selected locations to an electric motor NVH test results from a semi-anechoic chamber.

Styles APA, Harvard, Vancouver, ISO, etc.

15

Király, Tamás, Péter Primusz et Csaba Tóth. « Simulation of Static Tyre–Pavement Interaction Using Two FE Models of Different Complexity ». Applied Sciences 12, n^o 5 (25 février 2022) : 2388. http://dx.doi.org/10.3390/app12052388.

Texte intégral

Résumé :

The aim of this research study was to analyse the approaches for establishing a spatial model of a radial truck tyre, based on the finite element method, in order to perform a realistic analysis of static as well as dynamic tyre–pavement interactions. A complex rubber tyre model having a large number of elements was formulated combining current state-of-the-art modelling techniques and, from that model, a simplified model having a smaller number of elements was derived. The complex model proved to be useful only for static loading, because of its high computational demand, while the simplified model proved to be also suitable for dynamic modelling. The two tyre models having different numbers of elements were compared by analysing the contact areas and stresses. Our results indicate that the basic idea of not changing material characteristics while simplifying the model, rebuilding only the carcass using composite shell elements, did not prove to be a satisfactory direction. The results given by the simplified model do not describe the behaviour of the radial tyre well but, rather, describe the behaviour of the diagonal tyre, regarding contact areas and stresses. On the contrary, when analysing stresses and strains in the road pavement structure, the two finite element models provided similar results in practice. Based on our comparison calculations, applying the average contact pressure q at analysis points at a 5–8 cm depth, the contact behaviour of the finite element tyre model can be used in any elastic-layer theory-based software.

Styles APA, Harvard, Vancouver, ISO, etc.

16

Caputo, F., A. De Luca, A. Greco, A. Marro, A. Apicella, R. Sepe et E. Armentani. « Established Numerical Techniques for the Structural Analysis of a Regional Aircraft Landing Gear ». Advances in Materials Science and Engineering 2018 (17 octobre 2018) : 1–21. http://dx.doi.org/10.1155/2018/8536581.

Texte intégral

Résumé :

Usually during the design of landing gear, simplified Finite Element (FE) models, based on one-dimensional finite elements (stick model), are used to investigate the in-service reaction forces involving each subcomponent. After that, the design of such subcomponent is carried out through detailed Global/Local FE analyses where, once at time, each component, modelled with three-dimensional finite elements, is assembled into a one-dimensional finite elements based FE model, representing the whole landing gear under the investigated loading conditions. Moreover, the landing gears are usually investigated also under a kinematic point of view, through the multibody (MB) methods, which allow achieving the reaction forces involving each subcomponent in a very short time. However, simplified stick (FE) and MB models introduce several approximations, providing results far from the real behaviour of the landing gear. Therefore, the first goal of this paper consists of assessing the effectiveness of such approaches against a 3D full-FE model. Three numerical models of the main landing gear of a regional airliner have been developed, according to MB, “stick,” and 3D full-FE methods, respectively. The former has been developed by means of ADAMS® software, the other two by means of NASTRAN® software. Once this assessment phase has been carried out, also the Global/Local technique has verified with regard to the results achieved by the 3D full-FE model. Finally, the dynamic behaviour of the landing gear has been investigated both numerically and experimentally. In particular, Magnaghi Aeronautica S.p.A. Company performed the experimental test, consisting of a drop test according to EASA CS 25 regulations. Concerning the 3D full-FE investigation, the analysis has been simulated by means of Ls-Dyna® software. A good level of accuracy has been achieved by all the developed numerical methods.

Styles APA, Harvard, Vancouver, ISO, etc.

17

Dargahi, Ashkan, Mehdi Masoudi et Soheil Nakhodchi. « Finite Element Analysis of Fir-Tree Blade-Disc Assembly ». Applied Mechanics and Materials 392 (septembre 2013) : 191–96. http://dx.doi.org/10.4028/www.scientific.net/amm.392.191.

Texte intégral

Résumé :

The safe operation of industrial gas turbines is dependent on the structural integrity of the critical geometrical features such as blade-disc attachments. Knowledge of stress distribution in this region is the principal necessity for damage tolerance analysis and lifetime estimations. The finite element analysis which includes contact between two deformable bodies is complicated and takes extensive computational costs. A simplified FE model is needed which could predict the stress distribution without modeling the exact contact features. The main objective of this study is to present and compare two simplified FE models which can predict stress distribution at blade disc interface. Fir-tree region in a gas turbine disc assembly is modeled and comprehensive 2D and 3D non-linear finite element analysis is carried out. FE results are verified using photo elasticity method.

Styles APA, Harvard, Vancouver, ISO, etc.

18

Yoo, JinHyeong, et Nicholas J. Jones. « A Performance Prediction for Fe–Ga Magnetostrictive Strain Sensor Using Simplified Model ». IEEE Transactions on Magnetics 53, n^o 11 (novembre 2017) : 1–4. http://dx.doi.org/10.1109/tmag.2017.2698340.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

19

Neugebauer, Reimund, O. E. Bernhardi, Martin Wahl, Frank Schulz, Reinhard Mauermann, Wilhelm Schützle et S. Werner. « Predicting Dimensional Accuracy of Laser Welded Aluminum Add-On Body Parts ». Key Engineering Materials 549 (avril 2013) : 463–70. http://dx.doi.org/10.4028/www.scientific.net/kem.549.463.

Texte intégral

Résumé :

Laser welding of complex aluminum add-on body parts such as vehicle doors, is a common joining technology in the automotive industry. Besides the many advantages (e.g. high processing speed) laser welding provides, temperature induced distortions are an important task to deal with. In the last twenty years, several simplified FE methods, which predict welding distortion (weld seams, spot welds) of large assemblies, were presented. In order to simulate the distortion of large car body components properly, realistic clamping conditions need to be considered [1, 2, 3]. Furthermore, the calibration process of simplified models has to be examined systematically, to find out their limits and achieve optimal simulation results [4]. In this paper, a new FE model is presented to predict distortion of laser welded structures, based on a shrinkage volume approach. Effective surface based clamping conditions (derived of the real clamping device) and effects of previous forming processes are considered. The simplified model was examined due to an extensive design of experiments. Not only simple, but even complex simulated specimens match with the experimental results very well.

Styles APA, Harvard, Vancouver, ISO, etc.

20

Qiu, Ang, Cheng Bi Zhao, You Hong Tang et Wei Lin. « Rapid Predicting the Impact Behaviors of Marine Composite Laminates ». Materials Science Forum 813 (mars 2015) : 19–27. http://dx.doi.org/10.4028/www.scientific.net/msf.813.19.

Texte intégral

Résumé :

There are challenges of using composite laminates in the marine engineering, i.e., composites are frequently suffering from the effects of impaction including wave impaction, ship or other objects hitting, missiles or bullets hitting and other especially conditions. It is significant to understand the impact behaviors of laminates, in this research, the impact responses of typical laminates are investigated numerically. The delamination responses among the plies and fibre and/or matrix damage responses within the plies are simulated to understand the impaction behaviours of laminates under impaction conditions. The impact damage of composite laminates in the form of intra-and/or inter-laminar cracking is modelled by using stress-based criteria for damage initiation, and fracture mechanics technique is used to capture its evolution. Interface cohesive elements are inserted between plies with appropriate mixed-mode damage laws to predict the delamination. A group of graphite fibre/epoxy laminates with impact energies of 5, 10, 15 and 20 J, respectively, are simulated with a full scale FE model and a simplified FE model respectively. Through comparing the simulation results with each other, we find out that the impact behaviors obtained in the simplified FE model is comparable to experiments with a short computing time, but the simplified model cannot represent the properties of laminate after impact.

Styles APA, Harvard, Vancouver, ISO, etc.

21

Kalantari, Afshin, Mohammad Reza Nikoomanesh et Mohammad Ali Goudarzi. « Applicability of Mass-Spring Models for Seismically Isolated Liquid Storage Tanks ». Journal of Earthquake and Tsunami 13, n^o 01 (février 2019) : 1950002. http://dx.doi.org/10.1142/s1793431119500027.

Texte intégral

Résumé :

Employing base isolation technique for reduction of seismic response of liquid storage tanks has been proved to be quite effective. The main purpose of this paper is to quantitatively clarify, the contribution of convective and impulsive parts of the contained liquid in seismic behavior of an isolated liquid tank. Moreover, the accuracy of the simplified model which is generally used for the prediction of seismic behavior of conventional tanks is examined for isolated liquid tanks. For these purposes, the seismic response of the isolated cylindrical liquid storage tanks is considered using both the exact finite element model and simplified mass-spring model. The fluid–structure interaction is considered in finite element model. The comparison of the results obtained from two models shows that unlike conventionally constructed tanks, the contribution of convective mass cannot be neglected for seismically isolated tanks. Moreover, the accuracy of the simplified model for evaluating the main design parameters including base shear, global overturning moment, and sloshing height is examined for various tank dimensions and earthquake ground motions. The difference between the base shear and overturning moment results in the FE model and the simplified model of an isolated tank limited to 10%. It approves that the simplified mechanical models can be used with confidence for evaluating the seismic design parameters of various isolated tanks. However, the free surface displacement cannot be accurately predicted by simplified models, especially for medium and broad tanks.

Styles APA, Harvard, Vancouver, ISO, etc.

22

Yin, Jian-Hua, et Wei-Qiang Feng. « A new simplified method and its verification for calculation of consolidation settlement of a clayey soil with creep ». Canadian Geotechnical Journal 54, n^o 3 (mars 2017) : 333–47. http://dx.doi.org/10.1139/cgj-2015-0290.

Texte intégral

Résumé :

The calculation of the consolidation settlement of clayey soils with creep behaviour has been a challenging issue with a long history. After a brief review the assumptions made in the two methods based on Hypothesis A and Hypothesis B, the authors present a new simplified hypothesis B method for calculation of consolidation settlement of a clayey soil with creep. Equations of this method are derived based on the “equivalent time” concept for different stress–strain states. This simplified Hypothesis B method is then used to calculate the consolidation settlement of a number of typical consolidation problems. The approximation and verification of this simplified method are examined by comparing the calculated settlements with settlements computed using two fully coupled finite element (FE) consolidation analysis programs using elastic viscoplastic (EVP) constitutive models (Hypothesis B) and the Hypothesis A method. It is found that the curves calculated using the new Hypothesis B simplified method with a factor α = 0.8 are close to curves from two FE model simulations with relative errors in the range 0.37%∼8.42% only for three layers of Hong Kong marine clay (HKMC). In overall, the settlements calculated using Hypothesis A method are smaller than those from the two FE simulations with relative error in the range 6.52%∼46.17% for the three layers of HKMC. In addition, this new simplified Hypothesis B method is used to calculate the average strain of consolidation tests done by Berre and Iversen in 1972. The calculated results are compared with the test data, and values from a fully coupled finite difference (FD) consolidation analysis using Yin and Graham’s EVP constitutive model (Hypothesis B), and Hypothesis A method. It is found that, again, the results from the new simplified Hypothesis B method are very close to the measured data. In conclusion, the new simplified Hypothesis B method is a suitable simple method, by spread-sheet calculation of the consolidation settlement of a single layer of a clayey soil with creep.

Styles APA, Harvard, Vancouver, ISO, etc.

23

Zhu, Feng, Runzhou Zhou et David J. Sypeck. « Numerical Modeling and Safety Design for Lithium-Ion Vehicle Battery Modules Subject to Crush Loading ». Energies 14, n^o 1 (28 décembre 2020) : 118. http://dx.doi.org/10.3390/en14010118.

Texte intégral

Résumé :

In this work, a computational study was carried out to simulate crushing tests on lithium-ion vehicle battery modules. The tests were performed on commercial battery modules subject to wedge cutting at low speeds. Based on loading and boundary conditions in the tests, finite element (FE) models were developed using explicit FEA code LS-DYNA. The model predictions demonstrated a good agreement in terms of structural failure modes and force–displacement responses at both cell and module levels. The model was extended to study additional loading conditions such as indentation by a cylinder and a rectangular block. The effect of other module components such as the cover and cooling plates was analyzed, and the results have the potential for improving battery module safety design. Based on the detailed FE model, to reduce its computational cost, a simplified model was developed by representing the battery module with a homogeneous material law. Then, all three scenarios were simulated, and the results show that this simplified model can reasonably predict the short circuit initiation of the battery module.

Styles APA, Harvard, Vancouver, ISO, etc.

24

Bulant, P., L. Klimeš, I. Pšenčík et V. Vavryčuk. « Comparison of Ray Methods with the Exact Solution in the 1-D Anisotropic “Simplified Twisted Crystal” Model ». Studia Geophysica et Geodaetica 48, n^o 4 (octobre 2004) : 675–88. http://dx.doi.org/10.1023/b:sgeg.0000045476.92151.fe.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

25

Li, Yan Jun, Arild Håkonsen, Dag Mortensen, Tanja Pettersen et Trond Furu. « Modelling the Phase Transformation from Al₆(Mn,Fe) to α-Al(Mn,Fe)Si Phase during Homogenization of AA3xxx Alloys ». Materials Science Forum 519-521 (juillet 2006) : 297–302. http://dx.doi.org/10.4028/www.scientific.net/msf.519-521.297.

Texte intégral

Résumé :

A simplified numerical model for the solid state phase transformation from Al6(Mn,Fe) to α-Al(Mn,Fe)Si phase in 3xxx alloys has been constructed. In this model, the phase transformation is assumed to be initiated by the heterogeneous nucleation of α-Al(Mn,Fe)Si dispersoids at the interface between Al6(Mn,Fe) particle and matrix and the growth of the α- Al(Mn,Fe)Si phase into the Al6(Mn,Fe) particle is controlled by the diffusion of Si from the matrix. The model has been implemented into a numerical homogenization model. The simulation results show that the implementation of the phase transformation model improves much the prediction results of the homogenization model on the evolution of solid solution level of alloying elements and the volume fraction evolution of dispersoids in 3xxx alloys during homogenization.

Styles APA, Harvard, Vancouver, ISO, etc.

26

Wang, Lai, et Ying Zhang. « Influence of Simplified Models on Seismic Response Analysis of Wind Turbine Towers ». Applied Mechanics and Materials 94-96 (septembre 2011) : 369–74. http://dx.doi.org/10.4028/www.scientific.net/amm.94-96.369.

Texte intégral

Résumé :

Abstract. The dynamic response of wind turbine tower under earthquake is analyzed by aid of the ANSYS program in this paper. To investigate the effects of simplification calculation models of blades and engines on calculation results, a blades-tower integrated finite element (FE) model and a mass-tower finite element (FE) model are established respectively. Then model analysis is discussed and the time history analysis of the system under the input of mean value earthquake record is carried out. The results show that seismic responses of a wind turbine tower are remarkable and seismic action may be the dominant factor in the design of wind turbine towers that located at a seismically active zone. Torsion effect of a tower is evident as a result of the impact of mass eccentricity. Bottom stress at the direction perpendicular to seismic waves is much bigger than that along it. It is also found that the blades-tower integrated finite element model can reflect more accurately the dynamic responses of the tower in the whole process of the earthquake and the “time-lag” effect by comparison, and these provide reliable reference to design and further research of towers.

Styles APA, Harvard, Vancouver, ISO, etc.

27

Wang, Zhihao, Luyao Song, Zhipeng Cheng, Hui Yang, Jinlong Wen et Meng Qi. « Finite Element Model for Vibration Serviceability Evaluation of a Suspended Floor with and without Tuned Mass Dampers ». Buildings 13, n^o 2 (20 janvier 2023) : 309. http://dx.doi.org/10.3390/buildings13020309.

Texte intégral

Résumé :

This study aims to provide an accurate finite element (FE) modeling method for structural vibration serviceability evaluation of the suspended floor under human-induced excitation. The fundamental dynamic characteristics and human-induced vibration responses of a typical suspended floor were first measured via a series of field tests. Subsequently, the overall and local equivalent FE models of the suspended floor were respectively established, and their applicability was then verified by comparing the predicted dynamic characteristics and responses of the suspended floor with the corresponding field test results. Finally, passive tuned mass dampers (TMDs) were designed for vibration control of the suspended floor using the local equivalent FE model, and the applicability of the local FE model in assessing the vibration serviceability of the suspended floor with TMDs was further confirmed via pedestrian-induced vibration tests. Results demonstrate that the simplified local equivalent FE model proposed in this study can well replace the complicated overall FE model to evaluate the vibration serviceability of the suspended floor with and without TMDs.

Styles APA, Harvard, Vancouver, ISO, etc.

28

Wen, S. W., P. Hartley, I. Pillinger et C. E. N. Sturgess. « Roll pass evaluation for three-dimensional section rolling using a simplified finite element method ». Proceedings of the Institution of Mechanical Engineers, Part B : Journal of Engineering Manufacture 211, n^o 2 (1 février 1997) : 143–58. http://dx.doi.org/10.1243/0954405971516130.

Texte intégral

Résumé :

A simplified finite element (FE) method for modelling the complex three-dimensional deformation inherent in section rolling is presented. This simplified FE technique has been developed by considering a single slice of material of finite thickness passing through the roll gap, to avoid performing a full three- dimensional finite element analysis. Only one layer of a finite element mesh (consisting of brick elements) is generated on the slice of the process material taken from the three-dimensional workpiece. The slice of material is considered to be compressed using a pair of grooved dies, which have the same profiles as the rolls. In order to make this simplified pseudo-two-dimensional model more realistic, the speed of compression of the grooved dies is modified according to the vertical component of the peripheral roll velocity within the contact zone. Equations have been developed to approximate the roll separation force. This method is applied to perform a pre- and post-rolling FE analysis for the rolling process of a special section produced at British Steel's Skinningrove Works. The roll pass design and the stability of the rolling process are evaluated according to the results obtained from the FE predictions. Comparisons between FE results and experiment are made where possible.

Styles APA, Harvard, Vancouver, ISO, etc.

29

Fei, Teng, et Hai Tao Yu. « The Design of a Moving-Magnet Linear Oscillating Motor for Linear Compressors ». Applied Mechanics and Materials 416-417 (septembre 2013) : 433–38. http://dx.doi.org/10.4028/www.scientific.net/amm.416-417.433.

Texte intégral

Résumé :

The fundamental theory and simplified model of moving-magnet 1inear oscillating motor are presented in this paper. Based on the analysis of the equivalent magnetic and electric circuit model, a 2D finite element (FE) model of a linear oscillating motor with two separated stators is established. Through the FE simulation, the effect of the input voltage on the electric-magnetic force and displacement is investigated. The efficiency of the motor is estimated according to the analysis.

Styles APA, Harvard, Vancouver, ISO, etc.

30

Li, Kaiyang, Jie Fang, Bing Sun, Yi Li et Guobiao Cai. « Structural Dynamic Model Updating with Automatic Mode Identification Using Particle Swarm Optimization ». Applied Sciences 12, n^o 18 (6 septembre 2022) : 8958. http://dx.doi.org/10.3390/app12188958.

Texte intégral

Résumé :

Dynamic model-updating methods are a useful tool for obtaining high-precision finite element (FE) models. However, when using such methods to update a model, there will be problems with incompleteness and mode switching. To overcome these problems, this paper proposes a structural dynamic model-updating with an automatic mode-identification method. In this method, a mode-identification index is established based on image-similarity recognition to identify the consistency between FE and experimental mode shapes, and particle swarm optimization is introduced to update the model. In addition, to reduce the computational time, Latin hypercube sampling is employed to perform probability statistics of the switching range of the concerned mode orders, and the orders of mode identification are reduced according to the statistics results. In this paper, the proposed method was validated by model-updating of a square plate. The natural frequencies and mode shapes of the plate were obtained by experimental modal analysis and used as the updating objectives of the FE model. In addition, the boundary condition of the plate was simplified by a series of springs, which were used as updating parameters along with material properties and dimensions. Finally, the FE model of the plate was updated by the present method, and the results indicate that the objective function error of the updated FE model was successfully reduced from 14.31% to 1.05%, which proves that the proposed model-updating method is effective and feasible.

Styles APA, Harvard, Vancouver, ISO, etc.

31

Siripath, Nattarawee, et Satjarthip Thusneyapan. « Simplified shear relaxation modulus function of HDPE for FE simulation in extrusion blowing process ». MATEC Web of Conferences 264 (2019) : 03005. http://dx.doi.org/10.1051/matecconf/201926403005.

Texte intégral

Résumé :

Attempts to apply finite element analysis for simulation of the final geometry from extrusion blowing process have been studied. One of the accuracies for the prediction is a suitable mathematical model of the thermoplastic during the process. Visco-elastic model is found to be a suitable model by many researchers. This paper simplified the shear relaxation modulus function (SRMF) which characterizes the high-density polyethylene in molten state. Instead of the series of five exponential functions previously used, our simplified-SRMF consists of one power function of temperature and time. The deviation of our model from Williams-Landel-Ferry model with KBKZ constants, between the temperature of 140°C to 200°C and time from 0 to 10 sec, is 9.3706%. When simulated on a bottle, our model has the final bottle thickness and time deviation from WLF-KBKZ model by 0.19622% and 3.07362% respectively.

Styles APA, Harvard, Vancouver, ISO, etc.

32

Dalstra, M., R. Huiskes et L. van Erning. « Development and Validation of a Three-Dimensional Finite Element Model of the Pelvic Bone ». Journal of Biomechanical Engineering 117, n^o 3 (1 août 1995) : 272–78. http://dx.doi.org/10.1115/1.2794181.

Texte intégral

Résumé :

Due to both its shape and its structural architecture, the mechanics of the pelvic bone are complex. In Finite Element (FE) models, these aspects have often been (over) simplified, sometimes leading to conclusions which did not bear out in reality. The purpose of this study was to develop a more realistic FE model of the pelvic bone. This not only implies that the model has to be three-dimensional, but also that the thickness of the cortical shell and the density distribution of the trabecular bone throughout the pelvic bone have to be incorporated in the model in a realistic way. For this purpose, quantitative measurements were performed on computer tomography scans of several pelvic bones, after which the measured quantities were allocated to each element of the mesh individually. To validate this FE model, two fresh pelvic bones were fitted with strain gages and loaded in a testing machine. Stresses calculated from the strain data of this experiment were compared to the results of a simulation with the developed pelvic FE model.

Styles APA, Harvard, Vancouver, ISO, etc.

33

CAO, L. F., M. P. WANG, D. XIE, Z. LI et G. Y. XU. « MELTING-THERMODYNAMIC CHARACTERISTICS OF Fe, Co, Ni MAGNETIC NANOCRYSTALS ». Modern Physics Letters B 19, n^o 25 (10 novembre 2005) : 1253–60. http://dx.doi.org/10.1142/s0217984905009298.

Texte intégral

Résumé :

A simplified model that describes the size and shape dependence of melting thermodynamics of full free nanocrystals was established. Critical sizes of Fe , Co , Ni magnetic nanocrystals when the crystals keep their crystallinity were calculated and the corresponding minimum melting temperature was predicted. Theoretical predictions were consistent with experimental results.

Styles APA, Harvard, Vancouver, ISO, etc.

34

Khorsandnia, Nima, Hamid Valipour et Keith Crews. « Structural Response of Timber-Concrete Composite Beams Predicted by Finite Element Models and Manual Calculations ». Advances in Structural Engineering 17, n^o 11 (novembre 2014) : 1601–21. http://dx.doi.org/10.1260/1369-4332.17.11.1601.

Texte intégral

Résumé :

This paper presents the structural response of timber-concrete composite (TCC) beams predicted by finite element models (i.e. continuum-based and 1D frame) and manual calculations. Details of constitutive laws adopted for modelling timber and concrete are provided and application of the Hashin damage model in conjunction with continuum-based FE for capturing failure of timber under bi-axial stress state is discussed. A simplified strategy for modelling the TCC connection is proposed in which the connection is modelled by a nonlinear spring and the full load-slip behaviour of each TCC connection is expressed with a formula that can be directly implemented in the general purpose FE codes and used for nonlinear analysis of TCC beams. The developed FE models are verified by examples taken from the literature. Furthermore, the load-displacement response and ultimate loading capacity of the TCC beams are determined according to Eurocode 5 method and compared with FE model predictions.

Styles APA, Harvard, Vancouver, ISO, etc.

35

Lehane, Barry, et Martin Fahey. « A simplified nonlinear settlement prediction model for foundations on sand ». Canadian Geotechnical Journal 39, n^o 2 (1 avril 2002) : 293–303. http://dx.doi.org/10.1139/t01-091.

Texte intégral

Résumé :

This paper presents a simple method for predicting the settlement of spread foundations on sand operating under typical working loads. The method accounts for the well known effects on soil stiffness of strain, stress level, and density dependence, but adopts the simplifying assumption that the stress distribution beneath a loaded foundation can be obtained from Boussinesq's equations for an elastic half space. Despite this simplification, the method is shown to predict foundation responses that closely match those computed using more sophisticated finite element (FE) analyses and those measured in laboratory footing tests, where the stiffness characteristics in triaxial compression were well defined. The method is also seen to predict general variations of foundation settlement with bearing pressure, foundation width, and degree of preloading that are entirely consistent with empirically observed trends. It is concluded that satisfactory settlement predictions for shallow foundations on cohesionless soil may be obtained using Boussinesq's equations if the soil's vertical stiffness characteristics, as inferred from triaxial compression data, can be specified with some degree of precision.Key words: stiffness, settlement, cohesionless soil.

Styles APA, Harvard, Vancouver, ISO, etc.

36

Staszak, Natalia, Tomasz Garbowski et Anna Szymczak-Graczyk. « Solid Truss to Shell Numerical Homogenization of Prefabricated Composite Slabs ». Materials 14, n^o 15 (23 juillet 2021) : 4120. http://dx.doi.org/10.3390/ma14154120.

Texte intégral

Résumé :

The need for quick and easy deflection calculations of various prefabricated slabs causes simplified procedures and numerical tools to be used more often. Modelling of full 3D finite element (FE) geometry of such plates is not only uneconomical but often requires the use of complex software and advanced numerical knowledge. Therefore, numerical homogenization is an excellent tool, which can be easily employed to simplify a model, especially when accurate modelling is not necessary. Homogenization allows for simplifying a computational model and replacing a complicated composite structure with a homogeneous plate. Here, a numerical homogenization method based on strain energy equivalence is derived. Based on the method proposed, the structure of the prefabricated concrete slabs reinforced with steel spatial trusses is homogenized to a single plate element with an effective stiffness. There is a complete equivalence between the full 3D FE model built with solid elements combined with truss structural elements and the simplified homogenized plate FE model. The method allows for the correct homogenization of any complex composite structures made of both solid and structural elements, without the need to perform advanced numerical analyses. The only requirement is a correctly formulated stiffness matrix of a representative volume element (RVE) and appropriate formulation of the transformation between kinematic constrains on the RVE boundary and generalized strains.

Styles APA, Harvard, Vancouver, ISO, etc.

37

Ševeček, Oldřich, Petr Navrátil, Roman Papšík, Petr Skalka et Michal Kotoul. « Influence of the Ceramic Foam Structure Irregularity on the Tensile Response ». Solid State Phenomena 258 (décembre 2016) : 161–64. http://dx.doi.org/10.4028/www.scientific.net/ssp.258.161.

Texte intégral

Résumé :

To better understand response or fracture conditions of the ceramic foam materials to the mechanical loading, a finite element (FE) analysis of these structures has to be employed. The cellular structure of foams can be modelled either using a detailed realistic FE model based on the computer tomography scans or by using of simplified, beam element based, models. Nevertheless a main drawback of the realistic foam modelling consists in its high demandingness on computational resources. Therefore, simplified models are welcome substitutions (at least for analysis of the global mechanical foam response). The regular foam structure, based e.g. on Kelvin cells, is simple from the modelling point of view, but it doesn´t exactly capture the fully random character of the real foam structures and corresponding response to the external load. Definition of the random beam foam structure (respecting the real cell shapes and their distribution within volume), can thus improve this deficiency. The main aim of this work is thus to compare these different modelling approaches and quantify the influence of the foam irregularity on the response of ceramic foams to external (tensile) loading for various model sizes.

Styles APA, Harvard, Vancouver, ISO, etc.

38

Arai, T., K. Shinozuka et H. Sawai. « The kinetic analysis of the redox reaction of the simplified bleomycin model Fe-complex ». Journal of Inorganic Biochemistry 67, n^o 1-4 (juillet 1997) : 328. http://dx.doi.org/10.1016/s0162-0134(97)80197-3.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

39

Eladly, Mohammed M. « Behaviour of stainless steel beam-to-column bolted connections–Part 1 : Simplified FE model ». Journal of Constructional Steel Research 164 (janvier 2020) : 105784. http://dx.doi.org/10.1016/j.jcsr.2019.105784.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

40

Wiśniowski, Maciej. « Proposal Of Simplified Way of Applying Wind Load on Circular Cross-Section ». IOP Conference Series : Materials Science and Engineering 1203, n^o 3 (1 novembre 2021) : 032075. http://dx.doi.org/10.1088/1757-899x/1203/3/032075.

Texte intégral

Résumé :

Abstract Wind action on circular cross section was described in many publications. It finds an application for flue gas ducts, pipelines, silo or chimneys. This study concentrate on elements with diameter greater than 1m. There are well recognized analytical solutions of static calculation with uses Fourier-series for wind distribution. Although during last 10 years numerical methods of solving problems get more popular, especially among young engineers. For surface structures ability of analytical finding internal forces disappears, and Finish Element Method substitutes analytical calculation. Modelling of wind load in FEM programs cause several problems. Using wind load distribution proposed in Eurocode 1-4, or from laboratory test, it is usually necessary to divide circular cross-section into 32 up to 72 rectangular elements. Applying load in that way is the most accurate method to imitate wind load in FE model. From the other hand that take much time, and requires preparing data about distribution before modelling. Applying wind on complicated model, with many independent parts of piping, for at least 2 load cases cause faults and slows down work. This paper shows and compares a few proposal wind load models for numerical calculation. Those models were built to obtain accurate internal forces in compare to Eurocode procedure. Proposed models offers simplification of Geometry in numerical model, and saves of time. It also helps to make FE mesh become independent from structural nodes, lines or divisions. This paper concern on one case of one Reynolds number, with refers to 2m wide cylinder, wind velocity of 22m/s and surface roughness of steel plate – 0,05 mm. This paper compares different wind load distributions, in terms of required number of division of model, time consuming, precision of results. Author selected one proposal load distribution, with give equivalent internal forces as wind load distribution obtained from Wind Flow simulation (for example CFD method). Proposed model is useful for structural engineers and statics in offer stage of project. With some safety factor it can be also used as wind load as case for detailing cylindrical structures.

Styles APA, Harvard, Vancouver, ISO, etc.

41

Casarejos, Enrique, Jose Riol, Jose Lopez-Campos, Abraham Segade et Jose Vilan. « Evaluation of an FE Model for the Design of a Complex Thin-Wall CFRP Structure for a Scientific Instrument ». Materials 12, n^o 3 (5 février 2019) : 489. http://dx.doi.org/10.3390/ma12030489.

Texte intégral

Résumé :

In this paper, the reliability of a finite element (FE) model including carbon-fibre reinforced plastics (CFRPs) is evaluated for a case of a complex thin-wall honeycomb structure designed for a scientific instrument, such as a calorimeter. Mechanical calculations were performed using FE models including CFRPs, which required a specific definition to describe the micro-mechanical behaviour of the orthotropic materials coupled to homogeneous ones. There are well-known commercial software packages used as powerful tools for analyzing structures; however, for complex (many-parts) structures, the models become largely time consuming for both definition and calculation, which limits the appropriate feedback for the structure’s design. This study introduces a method to reduce a highly nonlinear model, including CFRPs, into a robust, simplified and realistic FE model capable of describing the deformations of the structure with known uncertainties. Therefore, to calculate the deviations of our model, displacement measurements in a reduced mechanical setup were performed, and then a variety of FE models were studied with the objective to find the simplest model with reliable results. The approach developed in this work leads to concluding that the deformations evaluated, including the uncertainties, were below the actual production tolerances, which makes the proposed model a successful tool for the designing process. Ultimately, this study serves as a future reference for complex projects requiring intensive mechanical evaluations for designing decisions.

Styles APA, Harvard, Vancouver, ISO, etc.

42

Shrestha, Kshitij C., Takuya Nagae et Yoshikazu Araki. « Finite Element Modeling of Cyclic Out-of-Plane Response of Masonry Walls Retrofitted by Inserting Inclined Stainless Steel Bars ». Journal of Disaster Research 6, n^o 1 (1 février 2011) : 36–43. http://dx.doi.org/10.20965/jdr.2011.p0036.

Texte intégral

Résumé :

This paper focuses on finite element (FE) modeling of the out-of-plane response of retrofitted masonry walls subjected to quasistatic cyclic loading. Retrofitting involves inserting inclined stainless steel bars on the plane perpendicular to the wall face, already practiced in several historical masonry structures in Japan. The FE model for masonry walls, in which continuum elements represent brick units, interface elements the brick unit/mortar interface, and truss elements reinforcing bars, is demonstrated in comparisons with experimental results. A simplified FE model we also propose represents reinforcing bars by an equivalent vertical bar to facilitate convergence and reduce the computational burden. A study evaluating numerical result sensitivity to modeling parameters demonstrates both modeling stability and retrofitting robustness.

Styles APA, Harvard, Vancouver, ISO, etc.

43

Sovilla, Bruno. « IMPACTO DE CORTO Y LARGO PLAZO DE LAS REMESAS EN MODELOS KEYNESIANOS ». Investigación Económica 81, n^o 322 (29 septembre 2022) : 73. http://dx.doi.org/10.22201/fe.01851667p.2022.322.83637.

Texte intégral

Résumé :

En este artículo sostenemos que las remesas pueden contraer la demanda agregada de las economías receptoras. En la primera parte de este trabajo estimamos un modelo estático para comprobar de manera analítica y gráfica el impacto de corto plazo de las remesas. Luego construimos un modelo dinámico mediante una simulación con desfases temporales que considera las variaciones de algunos parámetros de las funciones utilizadas. En la segunda parte, con base en el modelo de Kaldor, analizamos el impacto de las remesas en el proceso de acumulación y la distribución del ingreso en el largo plazo a través de las propensiones al consumo diferenciadas entre trabajadores y capitalistas y de una función inversión. SHORT-TERM AND LONG-TERM IMPACT OF REMITTANCES IN KEYNESIAN MODELSABSTRACTRemittances can have negative consequences on recipient economies, causing a contraction in aggregate demand. In the first part of this paper, we point out the short-run impact of remittances using a simplified static model that can be solved analytically and presented graphically. Subsequently, we carry out a simulation, introducing time lags that allow us to build a dynamic model and to consider the variations of some parameters of the functions used. In the second part we move on to a long-run analysis, using a model proposed by Kaldor, with consumption propensities differentiated between workers and capitalists and an investment function, which allow us to analyze the impact of remittances on the accumulation process and on income distribution.

Styles APA, Harvard, Vancouver, ISO, etc.

44

JUNGES, E., et H. L. LA ROVERE. « Comparison between simplified and FE models for short-term deflection in continuous RC beams ». Revista IBRACON de Estruturas e Materiais 10, n^o 2 (avril 2017) : 415–50. http://dx.doi.org/10.1590/s1983-41952017000200007.

Texte intégral

Résumé :

Abstract In this work, a comparative study of different simplified methods and nonlinear finite element (FE) models used for calculating short-term deflections (vertical displacements of the longitudinal axis) in continuous reinforced concrete (RC) beams, under service loads, is performed. The simplified methods employed are the one proposed by Branson and the bilinear method recommended by the European Code CEB - Design Manual on Cracking and Deformations. Two finite element models are utilized: the first one with frame elements in which material nonlinearities are considered along the element and its cross section divided into layers, by using of constitutive relationships for steel and concrete, while the second one utilizes beam elements, with physical nonlinearity considered by means of moment-curvature diagrams, obtained from Branson equation. Several examples of continuous RC beams under service loads are analysed and the results obtained by the different models are compared taking as reference the nonlinear frame element model. A few conclusions and recommendations regarding the use of the different methods are drawn at the end of the work.

Styles APA, Harvard, Vancouver, ISO, etc.

45

Cai, Yongzhou, Mengyan Zang et Fuyao Duan. « Modeling and Simulation of Vehicle Responses to Tire Blowout ». Tire Science and Technology 43, n^o 3 (1 septembre 2015) : 242–58. http://dx.doi.org/10.2346/tire.15.430301.

Texte intégral

Résumé :

ABSTRACT The finite element (FE) model of a tire to simulate tire blowout is developed, the effectiveness of which is validated by the tire blowout test. Then, a simplified FE model of a vehicle that integrates the tire model is established. The vehicle responses to tire blowout are analyzed under the situation of no steering and braking behavior on the vehicle. Finally, some meaningful results, such as the trajectory, yaw velocity of the vehicle, and the forces acting on the tires, are obtained. This study provides the foundation to further investigate the handling stability and control strategy of a vehicle when a tire blowout occurs during normal vehicle operation.

Styles APA, Harvard, Vancouver, ISO, etc.

46

Toropov, Andrey, Alla Toropova et Emilio Benfenati. « QSPR modelling of the octanol/water partition coefficient of organometallic substances by optimal SMILES-based descriptors ». Open Chemistry 7, n^o 4 (1 décembre 2009) : 846–56. http://dx.doi.org/10.2478/s11532-009-0095-y.

Texte intégral

Résumé :

AbstractUsually, QSPR is not used to model organometallic compounds. We have modeled the octanol/water partition coefficient for organometallic compounds of Na, K, Ca, Cu, Fe, Zn, Ni, As, and Hg by optimal descriptors calculated with simplified molecular input line entry system (SMILES) notations. The best model is characterized by the following statistics: n=54, r2=0.9807, s=0.677, F=2636 (training set); n=26, r2=0.9693, s=0.969, F=759 (test set). Empirical criteria for the definition of the applicability domain for these models are discussed.

Styles APA, Harvard, Vancouver, ISO, etc.

47

Neugebauer, Reimund, Markus Rössinger, Martin Wahl, Frank Schulz, Alexander Eckert et W. Schützle. « Predicting Dimensional Accuracy of Mechanically Joined Car Body Assemblies ». Key Engineering Materials 473 (mars 2011) : 973–80. http://dx.doi.org/10.4028/www.scientific.net/kem.473.973.

Texte intégral

Résumé :

Mechanical joining of complex car body components is an essential part of lightweight construction concepts in the field of car body manufacturing. Besides the mechanical behavior of the joints, the influence on the dimensional accuracy is of particular interest, as joining techniques like clinching or self-piercing riveting cause distortion comparable to spot welding. In recent years, a lot of simplified models using the FE-Method to predict the distortion of assemblies caused by welding (weld seams, spot welds) were presented and commercialized. In contrast to thermal joining technologies, there are no such simplified models with practical relevance existing in the mechanical joining technology sector. In this paper, a new method to predict distortion, caused by different mechanical joining technologies, including effects from previous forming processes, and clamping conditions, is presented. The validation of the simplified model takes place due to an extensive design of expe-riments. It can be proved that the distortion of simple as well as of complex specimens can be relia-bly predicted.

Styles APA, Harvard, Vancouver, ISO, etc.

48

PERERA, RICARDO, et SHENG-EN FANG. « INFLUENCE OF OBJECTIVE FUNCTIONS IN STRUCTURAL DAMAGE IDENTIFICATION USING REFINED AND SIMPLE MODELS ». International Journal of Structural Stability and Dynamics 09, n^o 04 (décembre 2009) : 607–25. http://dx.doi.org/10.1142/s021945540900320x.

Texte intégral

Résumé :

The most usual approach for solving damage identification problems is the use of the finite element (FE) model updating method. To apply the method, a minimization of an objective function measuring the fit between measured and model predicted data is performed. Then, the success of the procedure depends strongly on the accuracy of the FE model and the choice of a suitable objective function. Although detailed FE models provide an accurate means for calculating the dynamic response of the structure, their size and complexity involve a large number of parameters to be updated and a high computational cost. In order to shorten the computational time, more simplified and practical models able to model the global dynamic response of the structure accurately would be desirable. Furthermore, working with several objective functions instead of only one would increase the robustness and performance of the procedure. In this paper, a multi-objective simple beam model is proposed and compared with a more refined model based on plane elements. Furthermore, in the multi-objective framework, different combinations of objective functions are studied. The reliability and effectiveness of the proposed model has been evaluated in a damage detection problem of a reinforced concrete frame experimentally tested under different levels of damage.

Styles APA, Harvard, Vancouver, ISO, etc.

49

Montoya-Zapata, Diego, Camilo Cortés et Oscar Ruiz-Salguero. « FE-simulations with a simplified model for open-cell porous materials : A Kelvin cell approach ». Journal of Computational Methods in Sciences and Engineering 19, n^o 4 (11 novembre 2019) : 989–1000. http://dx.doi.org/10.3233/jcm-193669.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

50

Zhongwei, Zhao, Jian Xiangyang, Yuan Ye et Liu Haiqing. « Optimization for friction damped post-tensioned steel frame based on simplified FE model and GA ». Earthquake Engineering and Engineering Vibration 21, n^o 1 (24 octobre 2021) : 209–19. http://dx.doi.org/10.1007/s11803-021-2070-3.

Texte intégral

Styles APA, Harvard, Vancouver, ISO, etc.

Articles de revues sur le sujet « Simplified FE model »

Créez une référence correcte selon les styles APA, MLA, Chicago, Harvard et plusieurs autres