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Articles de revues sur le sujet "Simplified FE model"
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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.
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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.
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Šedek, Jakub, et Roman Růžek. « Magna-Lok rivet joint and the stiffness-equivalent FE model ». Aircraft Engineering and Aerospace Technology 91, no 6 (10 juin 2019) : 834–42. http://dx.doi.org/10.1108/aeat-07-2018-0188.
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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.
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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, no 4 (23 juillet 2008) : 408–15. http://dx.doi.org/10.1007/s00773-008-0008-3.
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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, no 12 (14 décembre 2022) : 1214. http://dx.doi.org/10.3390/machines10121214.
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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.
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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, no 2 (avril 2006) : 87–102. http://dx.doi.org/10.1680/stbu.2006.159.2.87.
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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, no 2 (mai 2008) : 154–63. http://dx.doi.org/10.1007/s00773-008-0274-0.
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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.
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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.
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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.
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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.
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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, no 3 (1 mars 2004) : 263–71. http://dx.doi.org/10.1243/095440604322900390.
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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.
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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, no 12 (9 décembre 2021) : 387. http://dx.doi.org/10.3390/aerospace8120387.
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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).
Thèses sur le sujet "Simplified FE model"
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González, Ignacio. « Dynamic Behaviour of the New Årsta Bridge to Moving Trains : Simplified FE ‐ Analysis and Verifications ». Thesis, KTH, Bro- och stålbyggnad (byte av engelskt namn 20110630), 2008. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-37019.
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Youssef, Michel. « Analyse de l'influence des paramètres structuraux et fonctionnels d'une cage thoracique sous chargement dynamique a l'aide d'un modèle simplifié ». Thesis, Lyon 1, 2012. http://www.theses.fr/2012LYO10190/document.
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En Union Européenne les accidents frontaux font 28% des accidents routiers et sont responsables de 49% de mortalité, les fractures thoraciques étant la cause principale de décès. Les modèles en éléments finis du corps humain sont un outil important pour la simulation de chocs réels et la prédiction des risques d'endommagement. Cette thèse a permis de développer un modèle simple en éléments finis de la cage thoracique suffisamment souple d'utilisation et facilement paramétrable. Ce modèle est validé expérimentalement avant d'être utilisé pour une étude paramétrique. Cette étude a permis de caractériser l'influence de différents paramètres structurels et géométriques sur le comportement de la cage thoracique sous chargement dynamique. Le travail réalisé au cours de cette thèse est divisé en trois parties : Modélisation de la cage thoracique entière avec des éléments finis de type poutre dont les propriétés mécaniques sont déterminées à partir d'essais de flexion trois points sur des segments de côtes et complétées par des éléments de la littérature, Validation du modèle dont les résultats sont suffisamment proches des résultats des essais de chargement dynamique antéro-postérieur menés par Vezin et Berthet [Vez09], Etude paramétrique sur l'influence paramètres, géométrie des sections droites et géométrie globale de la cage thoracique (inclinaison des côtes, forme et taille globale de la cage thoracique). A partir de cette étude nous trouvons que le module d'Young et l'épaisseur du cortical ont une influence identique sur la raideur globale de la cage thoracique ainsi que sur la rotation et la déformation des côtes. Avec l'augmentation de ces deux paramètres la rigidité du thorax augmente et le taux de compression maximal diminue. D'autre part les côtes tournent plus et se déforment moins. La raideur des liaisons costo-verterbales a une influence directe sur la rotation latérale qui diminue avec l'augmentation de cette raideur alors que les déformations augmentent ; tandis que la raideur globale de la cage thoracique est légèrement modifiée. L'inclinaison des côtes est le facteur ayant la plus grande influence sur la déformation des côtes et donc sur le risque d'endommagement : plus les côtes sont proches de la direction de chargement la raideur de la cage thoracique augmente et la déformation des côtes augmenteIn the European Union, 28% of road accidents are frontal impacts which provoke 49% of fatalities where the thoracic fractures are the main cause of death. The finite element models of the human body are an important tool for the simulation of real impacts and the prediction of damage. This thesis has led to develop a rib cage simplified finite element model sufficiently flexible and easily customizable. First, this model is experimentally validated and then used in a parametric study. This study allowed us to characterize the influence of different structural and geometric parameters on the behavior of the rib cage under dynamic loading. This work is divided into three parts : Modeling the rib cage using beam elements whose mechanical properties are determined by three-point bending tests on rib segments and supplemented from literature, Validating the model by simulating the anteroposterior dynamic loading tests led by Vezin and Berthet [Vez09], Performing a parametric study on the influence of the mechanical parameters (Young modulus, stiffness of costo-vertebral joints), the geometry of the rib sections and the overall geometry of the rib cage (ribs slope, shape and overall size of the rib cage). This study permitted to find that Young modulus and the thickness of the cortical have the same influence on the overall stiffness of the chest as well as on the rotation and deformation of the ribs. By increasing these parameters, the stiffness of the chest increases and the maximum compression ratio decreases. Besides, we'll find more rotation and less deformation of the ribs. The stiffness of the costoverterbal joints has a direct influence on the lateral rotation : it will decrease by increasing of the stiffness while deformation will increase. However, the overall stiffness of the chest is slightly modified by modifying the costovertebral joint stiffness. The initial inclination of the ribs accordingly to the load direction has the greatest influence on the deformation of the ribs and therefore on the damage risk. When the ribs are closer to the loading direction, the stiffness of the rib cage and the deformation of the ribs increases
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BRANDISKA, PAVLINA GEORGIEVA. « CONCEPT MODELING TECHNIQUES FOR THE DESIGN OF AUTOMOTIVE STRUCTURES ». Doctoral thesis, 2013. http://hdl.handle.net/2158/803876.
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During the last decades the overall trend in the automotive industry has been to shorten the design cycles and decrease the production costs while increasing the product quality with respect to competitors. In such a context there is an ever growing need for analysis that leads the design process from the concept phase onward. On the other hand, a conventional Finite Element (FE) model of a vehicle can be created only when its detailed Computer-Aided Design (CAD) model is available, which automatically excludes obtaining early stage simulation results. In this sense novel Computer-Aided Engineering (CAE) methodologies are required to support the concept modeling and optimization of vehicles.
This challenge defines the main framework of the research in the present dissertation. The leading motivation is to introduce new improvements and developments in the field of CAE concept approaches. The focus is put on the design of the car structure. The main objective is to obtain in an efficient way accurate
early stage predictions of its static and low frequency dynamic behavior by means of FE concept models. Predecessor-based concept modeling methods, which start from the reference FE model of an existing car and aim at achieving variant or incremental improvements of it, are addressed. Developments in regard to two main groups of techniques are introduced: methods based on simplified FE models of the vehicle structure and methods based on mesh morphing.
The related achievements are presented in this dissertation. To begin with, the current challenges of 1D beam concept modeling have been thoroughly investigated. Guidelines have been given on good practices to overcome the intrinsic limitations of the existing techniques and to make them more accurate and reliable.
Beam Bounding Box has been proposed as a novel approach for 1D beam concept modeling and optimization handling, which is accurate, computationally beneficial, easy to implement and to apply. Furthermore superelement joints have been introduced as means for the creation of more accurate simplified FE models. A major breakthrough has been achieved in the field of sizing optimization by identifying, improving, implementing and validating successfully Differential Evolution (DE) as an advanced alternative to the state-of-the-art gradient-based methods. Finally, surrogate modeling based on mesh morphing of predecessor FE models has been introduced as another option to enable fast modification and optimization studies in the concept stage. The added value of all these contributions in the automotive engineering practice has been demonstrated by their application on a number of realistic industrial case-studies throughout the dissertation.
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Zangeneh, Kamali Abbas. « Dynamic Soil-Structure Interaction Analysis of Railway Bridges : Numerical and Experimental Results ». Licentiate thesis, 2018. http://urn.kb.se/resolve?urn=urn:nbn:se:kth:diva-224313.
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The work reported in this thesis presents a general overview of the dynamic response of short-span railway bridges considering soil-structure interaction. The study aims to identify the effect of the surrounding and underlying soil on the global stiffness and damping of the structural system. This may lead to better assumptions and more efficient numerical models for design.A simple discrete model for calculating the dynamic characteristics of the fundamental bending mode of single span beam bridges on viscoelastic supports was proposed. This model was used to study the effect of the dynamic stiffness of the foundation on the modal parameters (e.g. natural frequency and damping ratio) of railway beam bridges. It was shown that the variation in the underlying soil profiles leads to a different dynamic response of the system. This effect depends on the ratio between the flexural stiffness of the bridge and the dynamic stiffness of the foundation-soil system but also on the ratio between the resonant frequency of the soil layer and the fundamental frequency of the bridge. The effect of the surrounding soil conditions on the vertical dynamic response of portal frame bridges was also investigated both numerically and experimentally. To this end, different numerical models (i.e. full FE models and coupled FE-BE models) have been developed. Controlled vibration tests have been performed on two full-scale portal frame bridges to determine the modal properties of the bridge-soil system and calibrate the numerical models. Both experimental and numerical results identified the substantial contribution of the surrounding soil on the global damping of short-span portal frame bridges. A simplified model for the surrounding soil was also proposed in order to define a less complicated model appropriate for practical design purposes.QC 20180315
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DI, GANGI GIORGIA. « Structural analysis and design of Timber Light-Frame shear walls ». Doctoral thesis, 2019. http://hdl.handle.net/11573/1241516.
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The thesis aims at investigating the seismic performances of timber light-frame shear walls with focus on the contribution offered by the sheathing-to-framing connections in terms of energy dissipation and ductility. Numerical non-linear analyses under displacement-controlled loading conditions are carried out using an original parametric finite element (FE) model developed within the open-source software OpenSees (McKenna and Fenves, 2007) in order to allow the easy variation of some basic design variables affecting the overall racking capacity of the wall, namely: i) aspect ratio, ii) nails spacing, iii) number of vertical studs and iv) cross-section size of the framing elements. In fact, although many researches dealt with the in-plane behavior of a fully-anchored timber shear wall, few efforts have been spent so far to analyze the mechanical behavior and the energy dissipation attributable to the sheathing-to-framing connections that, with hold-down connections, represent the highest contribution in terms of a wall deformation. There are few parametric analyses that consider different wall configurations (Salenikovich, 2000; Salenikovich and Dolan, 2003; Dhonju et al., 2017) of a fully-anchored timber shear wall. Several experimental tests have demonstrated that the dissipative behavior of a shear wall is mainly influenced by its connections. Timber has, in general, a poor dissipative capacity and is a brittle material in bending and in tension, unless it is properly reinforced (Jorissen and Fragiacomo, 2011). Conversely, the steel connections ensure a good amount of energy dissipation and cyclic ductility notwithstanding their significant pinching, strength degradation and softening. This evidence is well reflected into many numerical models proposed in literature, where the non-linear wall response is related to the load-deformation relationships of the connections (Tuomi and McCutcheon, 1978; Gupta and Kuo, 1985; Gupta and Kuo, 1987). Observing the results of the sensitivity analyses and starting from the study by Casagrande et al. (2016) - who model the timber shear wall considering rigid framing elements - an analytical procedure is here proposed to predict the capacity curve of a timber light-frame shear wall. Considering the characteristic non-linear softening-type behavior of timber structures, an analytical expression of the equivalent viscous damping is provided, which allows to assess the ductility of a common timber shear wall configuration. Finally, optimal configurations of a timber light-frame shear wall, considering two values of aspect ratio (2 and 1), are provided to show how the design variables affect the variation of racking capacity and costs.
Chapitres de livres sur le sujet "Simplified FE model"
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Huang, Shiwen, Chong Li, Fan Zhang, Anling Qi et Hang Lv. « Research and Application on the Deceleration Sled Simplified Finite Element Simulation ». Dans Advances in Transdisciplinary Engineering. IOS Press, 2022. http://dx.doi.org/10.3233/atde220032.
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Based on the basic structure of deceleration sled, the paper established an simplified finite element model by Ansys/Ls-Dyna software, which is verified by GB 13057-2014 passenger seat simulating impact test and GB 27887-2011 child seat simulating impact test. Then, how the sled mass and the layout of the steel bars influence the decelerating curves are being discussed through the FE calculation: when the layout of the steel bars and the initial velocity of the sled remain unchanged, the heavier the sled is, the longer the deceleration curve continued; when the sled mass and the initial velocity remain unchanged, the more centrally the steel bars are being placed, the larger the peak value of the deceleration curve is. What’s more, the finite element model in this paper can provide some guidance in the daily tests.
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Brocco, E., L. Moro et M. Biot. « A simplified FE model for the non-linear analysis of container stacks subject to inertial loads due to ship motions ». Dans Analysis and Design of Marine Structures V, 331–39. CRC Press, 2015. http://dx.doi.org/10.1201/b18179-45.
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« Structural analysis A simplified FE model for the non-linear analysis of container stacks subject to inertial loads due to ship motions ». Dans Analysis and Design of Marine Structures V, 345–54. CRC Press, 2015. http://dx.doi.org/10.1201/b18179-46.
Texte intégralActes de conférences sur le sujet "Simplified FE model"
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Markusic, Craig A., et Ram Songade. « Simplified Side Impact FE Model - SSM ». Dans SAE 2015 World Congress & Exhibition. 400 Commonwealth Drive, Warrendale, PA, United States : SAE International, 2015. http://dx.doi.org/10.4271/2015-01-1486.
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Raval, H., Z. W. Guan, M. Bailey et D. G. Covill. « Simplified 3-D FE model of thermal conditions inside a shoe ». Dans HEAT AND MASS TRANSFER 2006. Southampton, UK : WIT Press, 2006. http://dx.doi.org/10.2495/ht060391.
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Wang, Lidong, Svein Sævik, Naiquan Ye, Qianjin Yue, Zhixun Yang et Jinlong Chen. « Alternative Stress Models With Focus on Full FE Model for Flexible Risers ». Dans ASME 2016 35th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/omae2016-54547.
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Flexible risers are exposed to complicated loading conditions including internal/external pressure, wave and current loads, as well as floater movements. The combination of these three loads may lead to instability of the tensile armor wire in both longitudinal and transverse directions, which may result in different stress state based on different numerical models in BFLEX software. Simplified models have been implemented to calculate the stress in tensile armor wires with moderate accuracy, with only considering the longitudinal slip of wires. In order to investigate how the transverse slip will influence the stress state, a full finite element (FullFE) modeling option has been implemented recently to capture the interaction between different layers more precisely thus giving more accurate stress prediction. Different stress components will be compared with already existing simplified approaches. In addition, geodesic and loxodromic slip assumptions will be applied to study the slip behavior of the tensile armor layers.
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Wang, Ping, Qingmiao Wang, Xin Yang et Zhenfei Zhan. « Research on a Multi-Fidelity Surrogate Model Based Model Updating Strategy ». Dans ASME 2018 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2018. http://dx.doi.org/10.1115/imece2018-88421.
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In vehicle design modeling and simulation, surrogate model is commonly used to replace the high fidelity Finite Element (FE) model. A lot of simulation data from the high-fidelity FE model are utilized to construct an accurate surrogate model requires. However, computational time of FE model increases significantly with the growing complexities of vehicle engineering systems. In order to attain a surrogate model with satisfactory accuracy as well as acceptable computational time, this paper presents a model updated strategy based on multi-fidelity surrogate models. Based on a high-fidelity FE model and a low-fidelity FE model, an accurate multi-fidelity surrogate model is modeled. Firstly, the original full vehicle FE model is simplified to get a sub-model with acceptable accuracy, and it is able to capture the essential behaviors in the vehicle side impact simulations. Next, a primary response surface model (RSM) is built based on the simplified sub-model simulation data. Bayesian inference based bias term is modeled using the difference between the high-fidelity full vehicle FE model simulation data and the primary RSM running results. The bias is then incorporated to update the original RSM. This method can enhance the precision of surrogate model while saving computational time. A real-world side impact vehicle design case is utilized to demonstrate the validity of the proposed strategy.
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Ma˚rtensson, Hans, Johan Forsman et Martin Eriksson. « Simplified Forced Response HCF Assessment of Turbomachinery Blades ». Dans ASME Turbo Expo 2009 : Power for Land, Sea, and Air. ASMEDC, 2009. http://dx.doi.org/10.1115/gt2009-60166.
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A method is proposed for HCF-analysis that is suitable for use in early design stages of turbomachinery blades. Quantitative measures of the risk for later encountering HCF life limiting vibrations are the goal for the development. The novelty of the system is the unique and rational way all design data are processed resulting in a mode risk priority listing. The method makes extensive use of FE calculated modal analyses and simple assumptions on the modal force and damping. The modal force is taken proportional to the tangential force on the blade over the operating range. This choice is made because the tangential force is known early on from the compressor performance map, and gives a reasonable scaling with the operating point. Crossings occurring at low speed get a lower force than at high speed. The system damping used is a constant critical damping ratio. Using a modal force and damping along with the FE model forced response amplitude can be directly computed at resonance crossings inside operating envelope. The modal force calculated this way can be compared to the force amplitude needed to reach the fatigue limit in a Haigh diagram. Using the Haigh diagram this way allows modes with localized high stresses, so-called hot spots, to be highlighted. Taking the ratio of the forces gives a ranking value that can be used to compare risk. Details of the technique along with example applications to compressor blades are presented in the paper. It is found that many mode crossings can be excluded as low risk this way and that a rational way of prioritizing is achieved.
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Anderson, Andrew E., Steve A. Maas, Benjamin J. Ellis et Jeffrey A. Weiss. « Can the Hip Joint be Modeled Accurately Using Simplified Geometry ? » Dans ASME 2008 Summer Bioengineering Conference. American Society of Mechanical Engineers, 2008. http://dx.doi.org/10.1115/sbc2008-192902.
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Simplified analytical approaches to estimate hip joint contact pressures using perfectly spherical geometry have been described in the literature (rigid body spring models); however, estimations based on these simulations have not corresponded well with experimental in vitro data. Recent evidence from our laboratory suggests that finite element (FE) models of the hip joint that incorporate detailed geometry for cartilage and bone can predict cartilage pressures in good agreement with experimental data [1]. However, it is unknown whether this degree of model complexity is necessary. The objective of this study was to compare cartilage contact pressure predictions from FE models with varying degrees of simplicity to elucidate which aspects of hip morphology are required to obtain accurate predictions of cartilage contact pressure. Models based on 1) subject-specific (SS) geometry, 2) spheres, and 3) rotational conchoids were analyzed.
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O’Meara, Nicholas, John A. Francis, Simon D. Smith et Philip J. Withers. « Development of Simplified Empirical Phase Transformation Model for Use in Welding Residual Stress Simulations ». Dans ASME 2014 Pressure Vessels and Piping Conference. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/pvp2014-29100.
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The level and distribution of residual stresses in welds arises from the complex thermo-mechanical history of heat flow and thermal expansion at very high temperatures. It is not possible to make assessments of these with the methods that are used to determine service stresses. Simulation techniques have been developed over many years making it increasingly possible to predict residual stresses. These models need accurate materials data including, where applicable, the effect of phase transformations. In nuclear reactor pressure vessel welds, it is necessary to consider welding as a metallurgical problem as well as a thermo-mechanical one and FE simulations of these require a wide range of material data in order to create suitable input parameters. It is crucial that models of ferritic steel welds simulate the effects of phase transformations because the different phases have different thermal expansion coefficients. Partly due to differences in thermal expansion coefficient attributed to the different phases, but more significantly because of the associated transformation strain and transformation plasticity. Further to this, predicting the distribution of the phase fractions enables structural simulations to account for the distribution of mechanical properties throughout a weld. In this work, a simplified approach to producing an empirical model to simulate phase transformations in SA-508 Gr3 pressure vessel steel is presented. A commercial finite element package is used to implement the model which calculates the volume fraction of bainite, martensite and austenite and the thermal strains that evolve over the thermal excursions. The results of these FE simulations are compared to experimental data.
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Järvenpää, Veli-Matti, et Erno K. Keskinen. « Simplified FEM Model of Paper Machine Roll for Multibody Rolling Contact Analyses ». Dans ASME 2001 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2001. http://dx.doi.org/10.1115/imece2001/de-23244.
Texte intégralRésumé :
Abstract In this paper a finite element model of a rotating paper machine roll for nip unit rolling contact analyses is discussed. This work presented here is based on the earlier work of the authors presented in [1] and [2]. The major motivations for developing a tailored FE-model including the large spin rotation are firstly to include the complex vibration phenomena as the shell vibrations of the roll structure in the analyses and secondly to reduce the computational costs of the numerical simulations due to the large number of degrees of freedom. The approach used is the use of the modal analysis i.e. to express the dynamics of the roll in terms of the lowest eigenmodes. The equations of motion are at first written in the rotating coordinates and then in addition to this the equations are expressed by using the modal coordinates. Numerical tests executed show that this modeling technique reduces computational costs significantly. Furthermore, use of the (semidefinite) eigenmode basis maintains the vibration characteristics of the roll structure. For verification purposes a test model was constructed and these simulation results were compared to the standard geometrically non-linear finite element analysis.
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Anderson, Andrew E., Christopher L. Peters, Benjamin D. Tuttle et Jeffrey A. Weiss. « Development and Validation of a Finite Element Model of the Pelvis ». Dans ASME 2003 International Mechanical Engineering Congress and Exposition. ASMEDC, 2003. http://dx.doi.org/10.1115/imece2003-43134.
Texte intégralRésumé :
An improved understanding of the stress distribution in and around the hip joint may provide important information regarding the relationship between altered pelvic and acetabular geometry and development of hip osteoarthritis, as well as point to improved diagnostic methods and analysis of surgical treatment. It is very difficult to accurately assess how changes in pelvic geometry affect the stress and strain distribution of the joint in an experimental setting. The finite element (FE) method provides an alternative approach for study of hip joint mechanics. Although FE models of the pelvis have been developed, validation by direct comparison with subject-specific experimental measurements has not been performed. In addition, previous models have utilized over-simplified bone geometry and homogeneous material properties. The objectives of this study were to 1) develop and validate a FE model of the pelvis using subject-specific measurements of bone geometry as well as location-dependent cortical thickness and trabecular bone elastic modulus, and 2) assess the sensitivity of the subject-specific FE model to changes in material properties and cortical thickness.
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Yu, Je-Yong, Jin-Seok Park et Chang-Gi Ahn. « Dynamic Characteristic Analysis of Structures for Reactor Coolant Pump ». Dans ASME 2011 Pressure Vessels and Piping Conference. ASMEDC, 2011. http://dx.doi.org/10.1115/pvp2011-58019.
Texte intégralRésumé :
In this study, the dynamic characteristics of a reactor coolant pump (RCP) which can be used for APR1400 nuclear power plant are investigated using an equivalent simplified solid model. An effective simplified solid mass model to preserve the behavior of the RCP is presented. The equivalent simplified solid model for the dynamic analysis is developed from the detailed FE model of RCP through iterative runs. The results show that the fundamental frequency of RCP resides around 11Hz in the bending mode.
Rapports d'organisations sur le sujet "Simplified FE model"
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FINITE ELEMENT SIMULATION FOR ULTRA-HIGH-PERFORMANCE CONCRETE-FILLED DOUBLE-SKIN TUBES EXPOSED TO FIRE. The Hong Kong Institute of Steel Construction, août 2022. http://dx.doi.org/10.18057/icass2020.p.263.
Texte intégralRésumé :
Ultra-high-performance concrete (UHPC) or ultra-high-strength concrete (UHSC) are alternatively used to reduce construction materials, thereby achieving more sustainable constructions. Moreover, engaging the advantages of concrete cores and outer steel tubes in concrete-filled steel tubes (CFST) or ductile concrete-filled double-skin tubes (CFDST) is of great interest for the better performance of such members under fire. Nevertheless, current design provisions do not provide design models for UHPC-filled double-skin tubes under fire, and existing finite-element (FE) methodologies available in the literature may not accurately simulate the behaviour of CFDST exposed to fire. Therefore, this paper develops a comprehensive FE protocol implementing the scripting technique to model CFDST members for heat transfer and coupled (simultaneously or sequentially) thermal-stress analyses. Various modelling parameters incorporated in the proposed FE routine include the cross-sectional geometry (circular, elliptical, hexagonal, octagonal, and rectangular), the size (width, diameter, and wall thickness), interactions, meshing, thermal- and mechanical-material properties, and boundary conditions. The detailed algorithm for heat transfer analysis is presented and elaborated via a flow chart. Validations, verifications, and robustness of the developed FE models are established based on extensive comparison studies with existing fire tests available in the literature. As a result, and to recognize the value of the current FE methodology, an extensive parametric study is conducted for different affecting parameters (e.g., nominal steel ratio, hollowness ratio, concrete cylindrical strength, yield strength of metal tubes, and width-to-thickness ratio). Extensive FE results are used for optimizing the fire design of such members. Consequently, a simplified and accurate analytical model that can provide the axial load capacity of CFDST columns under different fire ratings is presented
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LOCAL BUCKLING (WRINKLING) OF PROFILED METAL-FACED INSULATING SANDWICH PANELS – A PARAMETRIC STUDY. The Hong Kong Institute of Steel Construction, août 2022. http://dx.doi.org/10.18057/icass2020.p.248.
Texte intégralRésumé :
This study aims to investigate the effects of various parameters including the height of the profiling region, spacing of profiling ribs, length of the panel, thickness and modulus of the foam core, and thickness of the profiled face sheet, on the local buckling capacity of profiled metal faced insulating sandwich panels. A simplified finite element (FE) modeling approach that models the profiled face sheet as a folded plate structure resting on elastic foundation is adopted. This modeling approach was validated through comparison with tests results and 3D FE modeling of the entire sandwich structure in a previous study conducted by the authors. The two-parameter elastic foundation properties are determined using a modified nonlinear Vlasov foundation model. The results show that all the above-mentioned parameters play important roles in controlling the buckling capacity of the panel. However, the slenderness ratio of the panel is the most dominant parameter among all. Understanding the influence of each of the aforementioned parameters aids in the design process of such panels and provides insight into their local buckling response.
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SIMPLIFIED MODELLING OF NOVEL NON-WELDED JOINTS FOR MODULAR STEEL BUILDINGS. The Hong Kong Institute of Steel Construction, décembre 2021. http://dx.doi.org/10.18057/ijasc.2021.17.4.10.
Texte intégralRésumé :
Prefabricated modular steel (PFMS) construction is a more efficient and safe method of constructing a high-quality building with less waste material and labour dependency than traditional steel construction. It is indeed critical to have a precise and valuable intermodular joining system that allows for efficient load transfer, safe handling, and optimal use of modular units' strength. Thus, the purpose of this study was to develop joints using tension bolts and solid tenons welded into the gusset plate (GP). These joints ensured rigid and secure connectivity in both horizontal and vertical directions for the modular units. Using the three-dimensional (3D) finite element (FE) analysis software ABAQUS, the study investigated the nonlinear lateral structural performance of the joint and two-storey modular steel building (MSB). The solid element FE models of joints were then simplified by introducing connectors and beam elements to enhance computational efficiency. Numerous parameters indicated that column tenons were important in determining the joint's structural performance. Moreover, with a standard deviation (SD) of 0.025, the developed connectors and beam element models accurately predicted the structural behaviour of the joints. As a result of their simplification, these joints demonstrated effective load distribution, seismic performance, and ductility while reducing computational time, effort, and complexity. The validity of the FE analysis was then determined by comparing the results to the thirteen joint bending tests performed in the reference.