Bibliographies thématiques / One-dimensional refined model

Littérature scientifique sur le sujet « One-dimensional refined model »

Auteur : Grafiati
Publié le 14 mars 2023

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

Choisissez une source :

Sommaire

Consultez les listes thématiques d’articles de revues, de livres, de thèses, de rapports de conférences et d’autres sources académiques sur le sujet « One-dimensional refined model ».

À côté de chaque source dans la liste de références il y a un bouton « Ajouter à la bibliographie ». Cliquez sur ce bouton, et nous générerons automatiquement la référence bibliographique pour la source choisie selon votre style de citation préféré : APA, MLA, Harvard, Vancouver, Chicago, etc.

Vous pouvez aussi télécharger le texte intégral de la publication scolaire au format pdf et consulter son résumé en ligne lorsque ces informations sont inclues dans les métadonnées.

Articles de revues sur le sujet "One-dimensional refined model"

1

Carrera, E., et M. Filippi. « A refined one-dimensional rotordynamics model with three-dimensional capabilities ». Journal of Sound and Vibration 366 (mars 2016) : 343–56. http://dx.doi.org/10.1016/j.jsv.2015.12.036.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
2

Pereira, Wildrimak S., Jhonatan M. S. Costa, Fábio L. C. Costa Júnior, Rômulo O. Barros et Ricardo M. Ramos. « Glucosamine-6-Phosphate Synthase de Mycobacterium tuberculosis um estudo in silico para predição de um modelo tridimensional refinado ». Somma : Revista Cientifica do Instituto Federal de Educação, Ciência e Tecnologia do Piauí 7, no 1 (21 avril 2021) : 1–9. http://dx.doi.org/10.51361/somma.v7i1.49.

Texte intégral
Résumé :
Tuberculosis is one of the main causes of death by an infectious agent in the world, according to the World Health Organization. Studies indicate that enzymes involved in the biosynthesis of uridine diphospho-N-acetylglucosamine are essential for the life cycle of the bacterium. One of these enzymes is glucosamine-6-phosphate synthase (GlmS), which does not have a three-dimensional structure available in the protein database on the internet. In this work, structural bioinformatics methods (comparative modeling and molecular refinement) were used to build a refined three-dimensional model for the GlmS enzyme of Mycobacterium tuberculosis. The model was generated using four templates structures (crystallographic). The results obtained for the stereochemical and general parameters of the refined model were better than the original model and similarto those templates structures, validating the refined model.
Styles APA, Harvard, Vancouver, ISO, etc.
3

MARTIN, PH A., et G. NENCIU. « SEMI-CLASSICAL INELASTIC S-MATRIX FOR ONE-DIMENSIONAL N-STATES SYSTEMS ». Reviews in Mathematical Physics 07, no 02 (février 1995) : 193–242. http://dx.doi.org/10.1142/s0129055x95000116.

Texte intégral
Résumé :
A mathematically fully controlled study of the semi-classical S-matrix associated with one-dimensional N-states systems is presented for energies above the barriers. The transmission coefficients are described by an “effective evolution” model which at high energies approaches the usual “common trajectory” model. In the two-states case a refined Landau-Zener formula describing the cross-over regime between avoided and real crossings is obtained.
Styles APA, Harvard, Vancouver, ISO, etc.
4

Zappino, Enrico, et Erasmo Carrera. « Thermo-piezo-elastic analysis of amplified piezoceramic actuators using a refined one-dimensional model ». Journal of Intelligent Material Systems and Structures 29, no 17 (3 août 2017) : 3482–94. http://dx.doi.org/10.1177/1045389x17721026.

Texte intégral
Résumé :
The thermo-piezo-elastic analysis of amplified piezoceramic actuators is presented in this article. A refined one-dimensional multi-field finite element model, based on the Carrera Unified Formulation, has been developed. Thermal and piezoelectric effects have been included in the structural model and a fully coupled thermo-piezo-elastic analysis has been performed. The finite element model has been assessed by comparing it with results from open literature The model has also been used to perform the analysis of complex amplified piezoceramic actuators. These actuators are able to amplify the displacements produced by piezoceramic material, but they suffer from high deformations when they undergo high thermal loads. An accurate thermal analysis has been performed to evaluate the strain/stress field. The results show the accuracy of the present model and its capabilities in multi-field analyses.
Styles APA, Harvard, Vancouver, ISO, etc.
5

Liao, Sheng-hui, Xing-hao Zhu, Jing Xie, Vikesh Kumar Sohodeb et Xi Ding. « Influence of Trabecular Bone on Peri-Implant Stress and Strain Based on Micro-CT Finite Element Modeling of Beagle Dog ». BioMed Research International 2016 (2016) : 1–11. http://dx.doi.org/10.1155/2016/3926941.

Texte intégral
Résumé :
The objective of this investigation is to analyze the influence of trabecular microstructure modeling on the biomechanical distribution of the implant-bone interface. Two three-dimensional finite element mandible models, one with trabecular microstructure (a refined model) and one with macrostructure (a simplified model), were built. The values of equivalent stress at the implant-bone interface in the refined model increased compared with those of the simplified model and strain on the contrary. The distributions of stress and strain were more uniform in the refined model of trabecular microstructure, in which stress and strain were mainly concentrated in trabecular bone. It was concluded that simulation of trabecular bone microstructure had a significant effect on the distribution of stress and strain at the implant-bone interface. These results suggest that trabecular structures could disperse stress and strain and serve as load buffers.
Styles APA, Harvard, Vancouver, ISO, etc.
6

Mackney, Michael D. A., et Carl T. F. Ross. « Preliminary Ship Design Using One and Two-Dimensional Models ». Marine Technology and SNAME News 36, no 02 (1 avril 1999) : 102–12. http://dx.doi.org/10.5957/mt1.1999.36.2.102.

Texte intégral
Résumé :
Computational studies of hull-superstructure interaction were carried out using one-, two-and three-dimensional finite element analyses. Simplification of the original three-dimensional cases to one- and two-dimensional ones was undertaken to reduce the data preparation and computer solution times in an extensive parametric study. Both the one- and two-dimensional models were evaluated from numerical and experimental studies of the three-dimensional arrangements of hull and superstructure. One-dimensional analysis used a simple beam finite element with appropriately changed sections properties at stations where superstructures existed. Two-dimensional analysis used a four node, first order quadrilateral, isoparametric plane elasticity finite element, with a corresponding increase in the grid domain where the superstructure existed. Changes in the thickness property reflected deck stiffness. This model was essentially a multi-flanged beam with the shear webs representing the hull and superstructure sides, and the flanges representing the decks One-dimensional models consistently and uniformly underestimated the three-dimensional behaviour, but were fast to create and run. Two-dimensional models were also consistent in their assessment, and considerably closer in predicting the actual behaviours. These models took longer to create than the one-dimensional, but ran in very much less time than the refined three-dimensional finite element models Parametric insights were accomplished quickly and effectively with the simplest model and processor, but two-dimensional analyses achieved closer absolute measure of the displacement behaviours. Although only static analysis with simple loading and support conditions were presented, it is believed that similar benefits would be found for other loadings and support conditions. Other engineering components and structures may benefit from similarly judged simplification using one- and two-dimensional models to reduce the time and cost of preliminary design.
Styles APA, Harvard, Vancouver, ISO, etc.
7

Baraldi, Daniele, Claudia Brito De Carvalho Bello, Antonella Cecchi et Filippo Ubertini. « Refined Rigid Block Model for In-Plane Loaded Masonry ». Advances in Civil Engineering 2020 (29 septembre 2020) : 1–13. http://dx.doi.org/10.1155/2020/8844759.

Texte intégral
Résumé :
In this work, a refined rigid block model is proposed for studying the in-plane behavior of regular masonry. The rigid block model is based on an existing discrete/rigid model with rigid blocks and elastoplastic interfaces that already proven its effectiveness in representing masonry behavior in linear and nonlinear fields. In this case, the proposed model is improved by assuming rigid quadrilateral elements connected by one-dimensional nonlinear interfaces, which are adopted both to represent mortar (or dry) joints between the blocks and also to represent inner potential cracks into the blocks. Furthermore, the softening behavior of interfaces in tension and shear is taken into account. Several numerical tests are performed by considering masonry panels with regular texture subjected to compression and shear. Particular attention is given to the collapse mechanisms and the pushover curves obtained numerically and compared with existing numerical and laboratory results. Furthermore, the numerical tests aim to evaluate the applicability limits of the proposed model with respect to existing results.
Styles APA, Harvard, Vancouver, ISO, etc.
8

Bhalla, Suresh, et Sumedha Moharana. « A refined shear lag model for adhesively bonded piezo-impedance transducers ». Journal of Intelligent Material Systems and Structures 24, no 1 (5 septembre 2012) : 33–48. http://dx.doi.org/10.1177/1045389x12457837.

Texte intégral
Résumé :
The performance (sensing/actuating) of a piezotransducer highly depends upon the ability of the bond layer to transfer the stress and strain (through shear lag mechanism) between the transducer and the structure. Therefore, the coupled electromechanical response of the piezotransducer should consider the effect of dynamic behaviour, geometry and composition of the adhesive layer used to bond the transducer patch on the structure. This article presents a new refined analytical model for inclusion of the shear lag effect in modelling of adhesively bonded piezoelectric ceramic (lead zirconate titanate) patches for consideration in the electromechanical impedance technique. The previous models neglected the inertial term in shear lag formulations for simplicity. The present refined model, on the other hand, considers the inertial and the shear lag effects simultaneously, and is therefore more rigorous and complete. In this article, the formulations are first derived for one-dimensional case, and then extended to two-dimensional lead zirconate titanate–structure interaction. The overall results are found to be in better proximity to experimental observations. The refined formulations are employed for a detailed stress analysis of the bond layer. The article concludes with a parametric study on the influence of various sensor parameters on the electromechanical impedance signatures.
Styles APA, Harvard, Vancouver, ISO, etc.
9

Anile, A. M., O. Muscato, S. Rinaudo et P. Vergari. « Testing Hydrodynamical Models on the Characteristics of a One-Dimensional Submicrometer Structure ». VLSI Design 6, no 1-4 (1 janvier 1998) : 155–60. http://dx.doi.org/10.1155/1998/63185.

Texte intégral
Résumé :
Recent advances in technology leads to increasing high speed performance of submicrometer electron devices by the scaling of both process and geometry. In order to aid the design of these devices it is necessary to utilize powerful numerical simulation tools. In an industrial environment the simulation codes based on the Drift-Diffusion models have been widely used. However the shrinking dimension of the devices causes the Drift-Diffusion based simulators to become less accurate. Then it is necessary to utilize more refined models (including higher order moments of the distribution function) in order to correctly predict the behaviour of these devices. Several hydrodynamical models have been considered as viable simulation tools. It is possible to discriminate among the several hydrodynamical models on the basis of their results on the output characteristics of the electron device which are measurable (I-V curves). We have analyzed two classes of hydrodynamical models: i) HFIELDS hydrodynamical models and HFIELDS drift-diffusion model; ii) self-consistent extended hydrodynamical models with relaxation times determined from Monte Carlo simulations.
Styles APA, Harvard, Vancouver, ISO, etc.
10

Usuba, Hiroki, Shota Yamanaka et Homei Miyashita. « Modeling Movement Times and Success Rates for Acquisition of One-dimensional Targets with Uncertain Touchable Sizes ». Proceedings of the ACM on Human-Computer Interaction 5, ISS (3 novembre 2021) : 1–15. http://dx.doi.org/10.1145/3486953.

Texte intégral
Résumé :
In touch interfaces, a target, such as an icon, has two widths: the visual width and the touchable width. The visual width is the target's appearance, and the touchable width is the area in which users can touch a target and execute an action. In this study, we conduct two experiments to investigate the effects of the visual and touchable widths on touch pointing performance (movement time and success rate). Based on the results, we build candidate models for predicting the movement time and compare them by the values of adjusted R^2 and AIC. In addition, we build a success rate model and test it through cross-validation. Existing models can be applied only to situations where the visual and touchable widths are equal, and we show that our refined model achieves better model fitness, even when such widths are different. We also discuss the design implications of the touch interfaces based on our models.
Styles APA, Harvard, Vancouver, ISO, etc.
Plus de sources

Chapitres de livres sur le sujet "One-dimensional refined model"

1

Zappino, Enrico, et Erasmo Carrera. « Refined One-Dimensional Models for the Multi-Field Analysis of Layered Smart Structures ». Dans Analysis and Modelling of Advanced Structures and Smart Systems, 343–66. Singapore : Springer Singapore, 2017. http://dx.doi.org/10.1007/978-981-10-6895-9_15.

Texte intégral
Styles APA, Harvard, Vancouver, ISO, etc.
2

Wang, Yingxu, Jason Huang et Jingsheng Lei. « The Formal Design Models of a Universal Array (UA) and its Implementation ». Dans Advances in Abstract Intelligence and Soft Computing, 241–59. IGI Global, 2013. http://dx.doi.org/10.4018/978-1-4666-2651-5.ch017.

Texte intégral
Résumé :
Arrays are one of the most fundamental and widely applied data structures, which are useful for modeling both logical designs and physical implementations of multi-dimensional data objects sharing the same type of homogeneous elements. However, there is a lack of a formal model of the universal array based on it any array instance can be derived. This paper studies the fundamental properties of Universal Array (UA) and presents a comprehensive design pattern. A denotational mathematics, Real-Time Process Algebra (RTPA), allows both architectural and behavioral models of UA to be rigorously designed and refined in a top-down approach. The conceptual model of UA is rigorously described by tuple- and matrix-based mathematical models. The architectural models of UA are created using RTPA architectural modeling methodologies known as the Unified Data Models (UDMs). The physical model of UA is implemented using linear list that is indexed by an offset pointer of elements. The behavioral models of UA are specified and refined by a set of Unified Process Models (UPMs). As a case study, the formal UA models are implemented in Java. This work has been applied in a number of real-time and nonreal-time systems such as compilers, a file management system, the real-time operating system (RTOS+), and the ADT library for an RTPA-based automatic code generation tool.
Styles APA, Harvard, Vancouver, ISO, etc.
3

Koch, Christof. « Voltage-Dependent Events in the Dendritic Tree ». Dans Biophysics of Computation. Oxford University Press, 1998. http://dx.doi.org/10.1093/oso/9780195104912.003.0025.

Texte intégral
Résumé :
So far, we worked under the convenient fiction that active, voltage-dependent membrane conductances are confined to the spike initiation zone at or close to the cell body and that the dendritic tree is essentially passive. Under the influence of one-dimensional passive cable theory, as refined by Rail and his school (Chaps. 2 and 3), the passive model of dendritic integration of synaptic inputs has become dominant and is taught in all the textbooks. Paradoxically, from the earliest days of intracellular recordings from the fat dendrites of spinal cord motoneurons with the aid of glass microelectrodes, active dendritic responses had been witnessed (Brock, Coombs, and Eccles, 1952; Eccles, Libet, and Young, 1958). Today, there exists overwhelming evidence for a host of voltage-dependent sodium and calcium-conductances in the dendritic tree. In the following section we summarize the experimental evidence and discuss current biophysical modeling efforts focusing on the question of the existence and genesis of fast all-or-none electrical events in the dendrites. We then turn toward possible functional roles of active dendritic processing. One word of advice. It has been argued that linear cable theory as applied to dendrites and taught in the first chapters of this book is irrelevant in the face of all this evidence for active processing and can be relegated to the dustbin. However, this would be a mistake. Under many physiological conditions these nonlinearities will not be relevant. Even if they are, the resistive and capacitive cable properties of the dendrites profoundly influence the initiation and propagation of dendritic action potentials and other active phenomena. Thus, for a complete understanding of the events in active dendritic trees we need to be thoroughly versed in cable theory. The issue of dendritic all-or-none electrical events must be seen as separate from the broader question of the existence and nature of active, that is, voltage-dependent, membrane conductances in the dendritic tree.
Styles APA, Harvard, Vancouver, ISO, etc.

Actes de conférences sur le sujet "One-dimensional refined model"

1

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

Texte intégral
Résumé :
In this paper, the dynamics of rotating structures has been studied using a refined one-dimensional finite element model with a node-dependent kinematics. The present approach has been used to derive models where refined theories are used only in the region in which they are required and classical models elsewhere. This produces a reduction in the computational cost without a reduction in the accuracy of the analysis. The equations of motion have been derived in a three-dimensional fashion and they include all contributions due to the rotational speed, namely the gyroscopic, the spin softening, and the centrifugal stiffening terms. Classical and higher-order refined models have been established with the Carrera Unified Formulation. The numerical model has been assessed and then a number of applications to thin-walled structures have been proposed. The current methodology appears very effective when rotors are constituted of components with different deformability such as compact shafts and disks. The results have been compared with those obtained from uniform kinematic models and convergence analyses have been performed. The results show the efficiency of the proposed model.
Styles APA, Harvard, Vancouver, ISO, etc.
2

Carrera, Erasmo, et Enrico Zappino. « Analysis of Complex Structures Coupling Variable Kinematics One-Dimensional Models ». Dans ASME 2014 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2014. http://dx.doi.org/10.1115/imece2014-37961.

Texte intégral
Résumé :
One-dimensional models are widely used in mechanical design. Classical models, Euler-Bernoulli or Timoshenko, ensure a low computational cost but are limited by their assumptions, many refined models were proposed to overcome these limitations and extend one-dimensional models at the analysis of complex geometries or advanced materials. In this work a new approach is proposed to couple different kinematic models. A new finite element is introduced in order to connect one-dimensional elements with different displacement fields. The model is derived in the frameworks of the Carrera Unified Formulation (CUF), therefore the formulation can be written in terms of fundamental nuclei. The results show that the use variable kinematic models allows the computational costs to be reduced without reduce the accuracy, moreover, refined-one dimensional models can be used in the analysis of complex structures.
Styles APA, Harvard, Vancouver, ISO, etc.
3

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

Texte intégral
Résumé :
The formulation of simplified models in the description of flow fields can be highly interesting in many complex network such as the circulatory system. This work presents a refined one-dimensional finite element model with node-dependent kinematics applied to incompressible and laminar flows. In the framework of 1D-FE modelling, this methodology is a new development of the Carrera Unified Formulation (CUF), which is largely employed in structural mechanics. According to the CUF, the weak formulation of the Stokes problem is expressed in terms of fundamental nuclei and, in this novel implementation, the kinematics can be defined node by node, realizing different levels of refinements within the main direction of the pipe. Such feature allows to increase the accuracy of the model only in the areas of the domain where it is required, i.e. particular boundary condition, barriers or sudden expansion. Some typical CFD examples are proposed to validate this novel technique, including Stokes flows in uniform and non-uniform domains. For each numerical example, different combinations of 1D models have been considered to account for different kinematic approximations of flows, and in particular, models based on Taylor and Lagrange expansion have been used. The results, compared with ones obtained from uniform kinematics 1D models and with those come from available tools, highlight the capability of the proposed model in handling non-conventional boundary conditions with ease and in preserving the computational cost without any accuracy loss.
Styles APA, Harvard, Vancouver, ISO, etc.
4

Zappino, Enrico, Navid Zobeiry, Marco Petrolo, Reza Vaziri, Erasmo Carrera et Anoush Poursartip. « Computationally Efficient Thermo-Mechanical Analysis for Predicting Process-Induced Deformations of Composite Structures ». Dans ASME 2019 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/imece2019-11261.

Texte intégral
Résumé :
Abstract This paper presents an innovative numerical model for the calculation of process-induced deformations of composite structures. The capabilities of a refined one-dimensional model, based on the Carrera Unified Formulation, have been exploited to describe the complex displacement field that originates during the curing process of a composite component. The refined kinematic models adopted are able to describe a three-dimensional solution and make it possible to predict the through-thickness deformation that is one of the causes of the origins of the process-induced deformations. The evolution of the material properties during the curing process is evaluated using the software RAVEN and the manufacturing process is simulated using an ‘incrementally elastic’ constitutive model. The results demonstrate the capabilities of the present approach to predict the process-induced deformations including the complex stress field due to thermal and mechanical loads.
Styles APA, Harvard, Vancouver, ISO, etc.
5

Pydah, Anup. « An Accurate Discrete Model for the Dynamics of Web-Core Sandwich Plates ». Dans ASME 2015 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/imece2015-50938.

Texte intégral
Résumé :
An accurate discrete model is presented here for the dynamics of simply supported web-core sandwich plates using the elasticity approach. By modelling the face-plates as 3D solids and the core webs using a plane stress idealization for transverse bending and classical one-dimensional models for lateral bending and torsion, the non-classical effects of transverse shear deformation, thickness-stretch and rotary inertia are completely accounted for in both, the face-plates and webs. Vibrational frequency results obtained using this model are used to highlight the errors of the commonly used model based on the classical Kirchhoff hypothesis for the face-plates, indicating the importance of using refined theories for modelling the face-plates.
Styles APA, Harvard, Vancouver, ISO, etc.
6

Cavallo, Tommaso, Alfonso Pagani, Enrico Zappino et Erasmo Carrera. « A Component-Wise Approach to Analyse a Composite Launcher Structure Subjected to Loading Factor ». Dans ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-66696.

Texte intégral
Résumé :
The space structures are realized by combining skin and reinforced components, such as longitudinal reinforcements called stringers and transversal reinforcements called ribs. These reinforced structures allow two main design requirements to be satisfied, the former is the light weight and the latter is a high strength. Solid models (3D) are widely used in the Finite Element Method (FEM) to analyse space structures because they have a high accuracy, in contrast they also have a high number of degrees of freedoms (DOFs) and huge computational costs. For these reasons the one-dimensional models (1D) are gaining success as alternative to 3D models. Classical models, such as Euler-Bernoulli or Timoshenko beam theories, allow the computational cost to be reduced but they are limited by their assumptions. Different refined models have been proposed to overcome these limitations and to extend the use of 1D models to the analysis of complex geometries or advanced materials. In this work very complex space structures are analyzed using 1D model based on the Carrera Unified Formulation (CUF). The free-vibration analysis of isotropic and composite structures are shown. The effects of the loading factor on the natural frequencies of an outline of launcher similar to the Arian V have been investigated. The results highlight the capability of the present refined one-dimensional model to reduce the computational costs without reducing the accuracy of the analysis.
Styles APA, Harvard, Vancouver, ISO, etc.
7

Carrera, E., A. Pagani, P. H. Cabral, A. Prado et G. Silva. « Component-Wise Models for the Accurate Dynamic and Buckling Analysis of Composite Wing Structures ». Dans ASME 2016 International Mechanical Engineering Congress and Exposition. American Society of Mechanical Engineers, 2016. http://dx.doi.org/10.1115/imece2016-65645.

Texte intégral
Résumé :
In the present work, a higher-order beam model able to characterize correctly the three-dimensional strain and stress fields with minimum computational efforts is proposed. One-dimensional models are formulated by employing the Carrera Unified Formulation (CUF), according to which the generic 3D displacement field is expressed as the expansion of the primary mechanical variables. In such a way, by employing a recursive index notation, the governing equations and the related finite element arrays of arbitrarily refined beam models can be written in a very compact and unified manner. A Component-Wise (CW) approach is developed in this work by using Lagrange polynomials as expanding cross-sectional functions. By using the principle of virtual work and CUF, free vibration and linearized buckling analyses of composite aerospace structures are investigated. The capabilities of the proposed methodology and the advantages over the classical methods and state-of-the-art tools are widely demonstrated by numerical results.
Styles APA, Harvard, Vancouver, ISO, etc.
8

Lin, Ray-Qing, et Joseph T. Klamo. « Ship Motions From Unsteady Maneuvering in Two-Dimensional Waves : Part I—Numerical Simulations ». Dans ASME 2011 30th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2011. http://dx.doi.org/10.1115/omae2011-49018.

Texte intégral
Résumé :
Numerically simulating the six-degrees-of-freedom response motions of a ship executing an unsteady maneuver in a two-dimensional wave environment is one of the most challenging tasks in seakeeping. Mathematical difficulties may occur for several reasons. For example, the rapid change in encounter frequencies may cause a numerical dynamics imbalance. Furthermore, in order to predict the ship’s track (ship heading) accurately, the rudder forces and two-dimensional drift forces must be predicted accurately; otherwise, erroneously predicted headings can ultimately lead to obtaining entirely different ship motions. To overcome these problems, we added a well-behaved, pre-conditional iterative method into the hybrid flow-based, fully-nonlinear ship motion model, DiSSEL (Digital, Self-consistent Ship Experimental Laboratory), in a two-dimensional wave environment. DiSSEL includes two components: a ship-wave interactions model (Lin et al., 2005[1], Lin and Kuang, 2006[2]), and a solid body motions interactions model (Lin and Kuang 2010[3]). The rudder and appendage forces (Lin et al, 2010[4]) are included in the solid body motions component. This refined model is able to overcome the mathematical dynamics imbalance when the encounter frequency rapidly changes as well as accurately calculate the forces on the hull and rudders. Finally the simulations of ship response motions at various relative headings and at various forward speeds in a two-dimensional seaway will be benchmarked against experimental model data for the test cases.
Styles APA, Harvard, Vancouver, ISO, etc.
9

Sumali, Hartono, Jaron D. Kuppers, David A. Czaplewski, Jordan E. Massad et Christopher W. Dyck. « Structural Dynamics of an RF MEMS Switch ». Dans ASME 2005 International Mechanical Engineering Congress and Exposition. ASMEDC, 2005. http://dx.doi.org/10.1115/imece2005-80956.

Texte intégral
Résumé :
The radio-frequency micro-electromechanical system (RF MEMS) switch comprises a plate suspended by four double-cantilever springs. When electrostatic actuation is applied, the plate moves toward the substrate and closes the switch. This article discusses how simulation and experimental methods improve the performance of the switch by suppressing mechanical rebounds and thus electrical signal discontinuities. To accurately simulate the mechanical motion of the switch, a high-fidelity three-dimensional finite element model is created to couple the solid dynamics with the electrostatic actuation. The displacement of the switch at various points is measured using a laser Doppler velocimeter through a microscope. The operational deflection shapes agree with the model. The three-dimensional model produces the necessary information for an effective one-dimensional model. The latter model is used to calculate an actuation voltage waveform to minimize switch velocity at closure, thereby suppressing switch rebound. The waveforms can be refined experimentally to compensate for switch property variations. Laboratory tests indicate that the waveform suppresses or eliminates rebound events.
Styles APA, Harvard, Vancouver, ISO, etc.
10

Hu, Yazhe, et Tomonari Furukawa. « A Self-Supervised Learning Technique for Road Defects Detection Based on Monocular Three-Dimensional Reconstruction ». Dans ASME 2019 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/detc2019-98135.

Texte intégral
Résumé :
Abstract This paper presents a self-supervised learning technique for road surface defects detection using a monocular camera. The uniqueness of the proposed technique relies on its self-supervised learning structure which is achieved by combining physics-driven three-dimensional (3D) reconstruction with data-driven Convolutional Neural Network (CNN). Only images from one camera are needed as the inputs to the model without human labeling. The 3D point cloud are reconstructed from input images based on a near-planar road 3D reconstruction process to self-supervise the learning process. During testing, the network receives images and predicts the images as defect or non-defect. A refined class prediction is produced by combining the 3D road surface data with the network output when the belief of original network prediction is not strong enough to conclude the classification. Experiments are conducted on real road surface images to find the optimal parameters for this model. The testing results demonstrate the robustness and effectiveness of the proposed self-supervised road surface defects detection technique.
Styles APA, Harvard, Vancouver, ISO, etc.
Vous pouvez également être intéressé par les bibliographies sur le sujet « One-dimensional refined model » pour d’autres types de sources :
Articles de revues
Nous offrons des réductions sur tous les plans premium pour les auteurs dont les œuvres sont incluses dans des sélections littéraires thématiques. Contactez-nous pour obtenir un code promo unique!

Vers la bibliographie