Bibliographies thématiques / Dynamic meshing

Littérature scientifique sur le sujet « Dynamic meshing »

Auteur : Grafiati
Publié le 6 septembre 2023

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Articles de revues sur le sujet "Dynamic meshing"

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Xu, Rui, Jing Zhang, Jiugen Wang, Zihui Wang, Lin Xi, Renjun Li et Hao Li. « New Method to Determine Dynamic Meshing Force for Spur Gears Considering the Meshing State of Multiple Pairs of Teeth ». Applied Sciences 12, no 9 (6 mai 2022) : 4690. http://dx.doi.org/10.3390/app12094690.

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The determination of meshing force and the load sharing ratio of gear teeth is critical to predict the dynamic behavior or the load capacity of gear transmissions. In the previous literature, the dynamic meshing force is usually calculated based on the traditional dynamic model, which ignores the different effects of the meshing characteristics of each pair of teeth on the dynamic behavior of the gear system. In this work, a new calculation method of dynamic meshing force is proposed based on the new dynamic model considering the meshing state of multiple pairs of teeth. The difference between the traditional calculation method and the new calculation method of dynamic meshing force is analyzed. Based on the new dynamic model and new calculation method of dynamic meshing force, the influence of different factors on dynamic response and dynamic meshing force are further discussed. The results show that, compared with the traditional calculation method, this new method can be used to effectively calculate the dynamic meshing force and the load sharing ratio of each pair of teeth with different meshing characteristics. The presented method for the calculation of the dynamic meshing force and the load sharing ratio provides an important reference for analyzing and predicting the dynamic behavior or the load capacity of spur gears, especially the high contact ratio (HCR) gears with contact ratio more than two.
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Fu, Hu Dai, Jin Gang Gao et Shan Gang Wang. « Dynamic Simulation of Gear Meshing Force Based on ADAMS ». Advanced Materials Research 1049-1050 (octobre 2014) : 867–70. http://dx.doi.org/10.4028/www.scientific.net/amr.1049-1050.867.

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It proposes a method for dynamic simulation of gear meshing force on the basis of dynamics analysis software ADAMS in the paper. Three dimensional solid model of parametric helical gear is built by using PRO/E. The data conversion between PRO/E and ADAMS has been realized. The parameters in contact force are confirmed based on the Hertz elastic impact theory. The gear meshing process has been simulated and analyzed by using mechanical system dynamic simulation software ADAMS. The change regulation of meshing force in the time-domain and frequency-domain has been researched under different speed conditions. It is proved that the meshing force of gears can be accurately simulated by using ADAMS. The simulation results of meshing force can provide basic data for the next gear strength analysis. It also can provide the reference for the analysis of gear dynamic optimization, fatigue and stiffness.
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Wang, Xigui, Jian Zhang, Yongmei Wang, Chen Li, Jiafu Ruan et Siyuan An. « Research on Meshing Gears CIMT Design and Anti-Thermoelastic Scuffing Load-Bearing Characteristics ». Materials 15, no 6 (11 mars 2022) : 2075. http://dx.doi.org/10.3390/ma15062075.

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In the process of gear meshing, it is an inevitable trend to encounter failure cases such as contact friction thermal behavior and interface thermoelastic scuffing wear. As one of the cores influencing factors, the gear meshing contact interface micro-texture (CIMT) significantly restricts the gear transmission system (GTS) dynamic characteristics. This subject suggests the contact characteristic model and interface friction dynamics coupling model of meshing gear pair with different CIMT. Considering the influence of gear meshing CIMT on distribution type of hydrodynamic lubricating oil film, contact viscous damping and frictional thermal load, the aforementioned models have involved transient meshing stiffness (TMS) and static transmission accumulated error (STAE). Based on the proposed models, an example verification of meshed gear pair (MGP) is analyzed to reveal the influence of CIMT on the dynamic characteristics of GTS under a variety of micro-texture configurations and input branch power and rated speed/shaft torque conditions. Numerical simulation results indicate that the influence of CIMT on gear dynamic response is extremely restricted by the transient contact regularity of the meshing gear surface. Meshing gears’ dynamic characteristics (especially vibration and noise) can be obviously and effectively adjusted by setting a regular MGP with CIMT instead of random gear surfaces.
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Shan, Li Jun, Wei Dong He et Tian Min Guan. « Analysis of Nonlinear Characteristics of Double-Crank Ring-Plate-Typed Pin-Cycloid Gear Planetary Drive ». Advanced Materials Research 44-46 (juin 2008) : 711–16. http://dx.doi.org/10.4028/www.scientific.net/amr.44-46.711.

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Double-crank ring-plate-typed pin-cycloid gear planetary drive conquers shortcomings of a traditional pin-cycloid gear planetary drive, whose load-capacity is restricted by rotation-arm bearing dimension. The load-capacity of this kind of new drive is improved greatly and the efficiency of whole machine is 94%. In order to know dynamics reliability of this drive , nonlinear characteristics of double-crank ring-plate-typed pin-cycloid gear planetary drive are analyzed from two sides of transmission error and dynamic meshing process in this paper. A sensitive analytic mathematic model of rod dimension error is set up by kinematics theory. Based on ring-plate-type cycloid drive dynamic meshing characteristics, a rigidity-flexibility combined model of pin-cycloid planetary drive is set up by ANSYS/LS-DYNA module. Meshing process between pin-cycloid gear is simulated by FEM. Instantaneous stress, distortion and dynamic meshing rigidity are computed. Analytical results show that nonlinear meshing rigidity and transmission errors are two main dynamic exciters which cause prototype to vibrate. So, rod dimension error should be reduced in order to increase meshing accuracy, and meshing rigidity of new prototype should be increased in order to reduce vibration. Nonlinear characteristics of the drive can offer some theoretical bases for design of new prototype.
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Feng, Zengming, Fuliang Suo et Yabing Cheng. « 58793 MESHING MECHANISM AND DYNAMIC ANALYSIS OF NEW SILENT CHAIN(Dynamics of Machine Components) ». Proceedings of the Asian Conference on Multibody Dynamics 2010.5 (2010) : _58793–1_—_58793–5_. http://dx.doi.org/10.1299/jsmeacmd.2010.5._58793-1_.

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Wang, Haiwei, Cheng Ji, Fengxia Lu, Cheng Wang et Xueyan Sun. « A Generalized Dynamic Model and Coupling Meshing Force Analysis for Planetary Gear Set Transmissions ». Applied Sciences 12, no 12 (20 juin 2022) : 6279. http://dx.doi.org/10.3390/app12126279.

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The dynamics analysis of a planetary gear set transmissions requires the creation of completely different models for different gears, which is very tedious. In this paper, a generalized dynamics modeling process is proposed for a three planetary gear set transmissions, and a generalized dynamic model for multiple gears is established by using the lumped mass method. The analysis of meshing force characteristics is carried out for the second gear position, and the meshing frequency coupling phenomenon between the meshing forces of the three planetary gear sets is investigated. The results show that, for the current gear set of meshing force, the meshing frequency components of other gear sets only appear in a part of the speed, and with the increase in speed, certain low-frequency components of other sets that exist at low speed will decrease or even disappear, and the coupling relationship between the meshing forces of different planetary gear sets is not symmetrical.
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Yang, Li, Wu Bao-lin et Zhu Lin-lin. « Analysis and Calculation of Double Circular Arc Gear Meshing Impact Model ». Open Mechanical Engineering Journal 9, no 1 (16 mars 2015) : 160–67. http://dx.doi.org/10.2174/1874155x01509010160.

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The goal of this study is to propose a new theoretical approach for the analysis of the impact of the double circular arc gear meshing. The gear meshing impact dynamic model for four different meshing states was firstly built in the gear system. According to the mechanical dynamics and dynamics of the gear system, the reasons for the meshing impact and the impact type of double-circular-arc gear were analyzed in the paper. The content of the paper covers: (i) analysis of the mechanism of meshing impact; (ii) the practical meshing impact process; (iii) establishment of meshing impact model; (iv) solution of the meshing impact radius; (v) calculation of the meshing impact force in theory. The reverse method and the graphing method were used to determine the starting positions of impact and its coordinate formulas were built. Formula of impact velocity, impact force and impact radius were also established. Impact force is calculated with formulas constructed above. This paper’s target is quite innovative and applicable and the paper gives a new way for double circular arc gear meshing impact research.
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Liu, Xuan, Zongde Fang, Haitao Jia, Ning Zhao, Yunbo Shen, Hui Guo et Xijin Zhang. « Investigation of Load Sharing and Dynamic Load Characteristics of a Split Torque Transmission System with Double-Helical Gear Modification ». Shock and Vibration 2021 (29 juin 2021) : 1–22. http://dx.doi.org/10.1155/2021/9912148.

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A new dynamic model for a two-input two-path split torque transmission system which considers meshing error, time-varying meshing stiffness, and meshing-in impact is proposed. Time-varying meshing stiffness and meshing-in impact of each gear pair are accurately calculated based on tooth contact analysis and loaded tooth contact analysis. Equivalent displacements of eccentricity error and installation error along the meshing line of second- and third-stages gears are derived. The modified tooth surface of a third-stage double-helical gear is obtained by optimizing the amplitude of static loaded transmission error and meshing-in impact via nondominated sorting genetic algorithm-II (NSGA-II). Influence of modification on load sharing and dynamic load characteristics of split torque transmission system is investigated. The results indicate that the system’s dynamic meshing force increases when meshing-in impact is accounted for, which is unfavorable for the transmission. Following the modification of a double-helical gear, the dynamic load characteristics of the split torque transmission system are significantly improved, while its load sharing characteristics are improved to a certain extent.
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Hu, Shengyang, Zongde Fang, Yingqiang Xu, Yabin Guan et Rui Shen. « Meshing impact analysis of planetary transmission system considering the influence of multiple errors and its effect on the load sharing and dynamic load factor characteristics of the system ». Proceedings of the Institution of Mechanical Engineers, Part K : Journal of Multi-body Dynamics 235, no 1 (10 janvier 2021) : 57–74. http://dx.doi.org/10.1177/1464419320986285.

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The meshing impact on transmission system and internal meshing gear pair and its impact on the load sharing and dynamic characteristics of the system are not well understood yet. In this paper, the meshing impact models of internal gear pairs and planetary transmission system were successfully constructed, and the meshing impact point, meshing impact time and meshing impact force were accurately obtained. Meshing impact in gear transmission system is obviously affected by eccentricity error, installation error, and other errors. Due to the difference in error of each component, the internal and external gears of each branch lead to different meshing positions, which causes the constant change in meshing impact point, meshing impact time and meshing impact force. This creates difficulties in the analysis of meshing impact characteristics of gear transmission system. Load Tooth Contact Analysis (LTCA) method can be used to accurately analyse the change in position of gear tooth under load condition. Through the dynamic model of planetary transmission system, the influence in component errors on the contact position of tooth surface is obtained. Combining the loaded transmission error of the tooth surface under load and the geometric transmission errors under the influence of component errors, the model of meshing impact for accurately solving the system is deduced, and the influence of meshing impact on the system's load sharing coefficient and dynamic load factor coefficient is analysed. By comparing the planetary transmission system before and after considering the meshing impact of the system, it is found that the system's load-sharing coefficient increases slightly, dynamic load factor coefficient fluctuates significantly, and meshing force becomes more clutter after considering meshing impact.
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Liu, Yang, Yinghou Jiao, Shiyuan Qi, Guangbin Yu et Mengdi Du. « Study on the Nonlinear Dynamic Behavior of Rattling Vibration in Gear Systems ». Machines 10, no 12 (23 novembre 2022) : 1112. http://dx.doi.org/10.3390/machines10121112.

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To reveal the nonlinear dynamic behavior of gear rattling vibration caused by gear backlash, a 2-DOF oscillator model with spring and damping elements was established. Based on the theory of discontinuous dynamical systems, the phase plane of gear motion was divided into three parts: the domain of tooth surface meshing motion, the domain of free motion and the domain of tooth back meshing motion. Introducing the global mapping and local mapping dynamics method, the process of gear teeth from impact to meshing and then impact and meshing was accurately described. The influence of different restitution coefficients on gear impact-meshing motion was studied by numerical simulation. The results showed that the grazing bifurcation caused by gear backlash will lead to complex mapping structures of the system and even chaos. The restitution coefficient directly affects the impact-meshing behavior. The introduction of meshing stiffness and restitution coefficient can reasonably characterize the elastic deformation and energy loss during gear meshing, which provides a theoretical model for the application of the theory of discontinuous dynamical systems to a more complex multi-degree of freedom flexible contact gear transmission system.
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Thèses sur le sujet "Dynamic meshing"

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Worrall, Adam. « Dynamic discontinuity meshing ». Thesis, University of Bristol, 1998. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.246285.

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Chambers, Steven B. « Investigation of combustive flows and dynamic meshing in computational fluid dynamics ». Thesis, Texas A&M University, 2004. http://hdl.handle.net/1969.1/1324.

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Computational Fluid Dynamics (CFD) is a field that is constantly advancing. Its advances in terms of capabilities are a result of new theories, faster computers, and new numerical methods. In this thesis, advances in the computational fluid dynamic modeling of moving bodies and combustive flows are investigated. Thus, the basic theory behind CFD is being extended to solve a new class of problems that are generally more complex. The first chapter that investigates some of the results, chapter IV, discusses a technique developed to model unsteady aerodynamics with moving boundaries such as flapping winged flight. This will include mesh deformation and fluid dynamics theory needed to solve such a complex system. Chapter V will examine the numerical modeling of a combustive flow. A three dimensional single vane burner combustion chamber is numerically modeled. Species balance equations along with rates of reactions are introduced when modeling combustive flows and these expressions are discussed. A reaction mechanism is validated for use with in situ reheat simulations. Chapter VI compares numerical results with a laminar methane flame experiment to further investigate the capabilities of CFD to simulate a combustive flow. A new method of examining a combustive flow is introduced by looking at the solutions ability to satisfy the second law of thermodynamics. All laminar flame simulations are found to be in violation of the entropy inequality.
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Acikgoz, Nazmiye. « Adaptive and Dynamic Meshing Methods for Numerical Simulations ». Diss., Georgia Institute of Technology, 2007. http://hdl.handle.net/1853/14521.

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For the numerical simulation of many problems of engineering interest, it is desirable to have an automated mesh adaption tool. This is important especially for problems characterized by anisotropic features and require mesh clustering in the direction of high gradients. Another significant issue in meshing emerges in unsteady simulations with moving boundaries, where the boundary motion has to be accommodated by deforming the computational grid. Similarly, there exist problems where current mesh needs to be adapted to get more accurate solutions. To solve these problems, we propose three novel procedures. In the first part of this work, we present an optimization procedure for three-dimensional anisotropic tetrahedral grids based on metric-driven h-adaptation. Through the use of topological and geometrical operators, the mesh is iteratively adapted until the final mesh minimizes a given objective function. We propose an optimization process based on an ad-hoc application of the simulated annealing technique, which improves the likelihood of removing poor elements from the grid. Moreover, a local implementation of the simulated annealing is proposed to reduce the computational cost. Many challenging unsteady multi-physics problems are characterized by moving boundaries and/or interfaces. When the boundary displacements are large, degenerate elements are easily formed in the grid such that frequent remeshing is required. We propose a new r-adaptation technique that is valid for all types of elements (e.g., triangle, tet, quad, hex, hybrid) and deforms grids that undergo large imposed displacements at their boundaries. A grid is deformed using a network of linear springs composed of edge springs and a set of virtual springs. The virtual springs are constructed in such a way as to oppose element collapsing. Both frequent remeshing, and exact-pinpointing of clustering locations are great challenges of numerical simulations, which can be overcome by adaptive meshing algorithms. Therefore, we conclude this work by defining a novel mesh adaptation technique where the entire mesh is adapted upon application of a force field in order to comply with the target mesh or to get more accurate solutions. The method has been tested for two-dimensional problems of a-priori metric definitions as well as for oblique shock clusterings.
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Radovitzky, Raúl A. Ortiz Michael. « Error estimation and adaptive meshing in strongly nonlinear dynamic problems /cRaúl A. Radovitzky ; Michael Ortiz, Committee Chair ». Diss., Pasadena, Calif. : California Institute of Technology, 1998. http://resolver.caltech.edu/CaltechETD:etd-11032003-113427.

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Moraes, Matheus de. « Validação de um modelo dinâmico realístico de um par engrenado aplicado no monitoramento de condições de transmissões / ». Ilha Solteira, 2019. http://hdl.handle.net/11449/182380.

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Orientador: Aparecido Carlos Gonçalves
Resumo: Pares engrenados são elementos de transmissão de potência amplamente utilizados em máquinas e equipamentos, todavia as falhas catastróficas desses componentes são comuns e dispendiosas. A análise de vibrações está entre as técnicas de diagnóstico de defeitos incipientes utilizadas em manutenção preditiva, posto que a presença de uma falha altera o comportamento dinâmico do sistema e o estado de degradação pode ser detectado pelo monitoramento dos sinais de vibração. Na indústria atual, onde as aquisições de dados, tanto para controle de processos, quanto para o monitoramento das condições de integridade de equipamentos, são realizadas em tempo real, faz-se necessário o desenvolvimento de métodos que aumentem a confiabilidade das tomadas de decisões em relação à identificação, localização e prognóstico de falhas. O objetivo deste trabalho é desenvolver um modelo matemático de par de engrenagens que auxilie no monitoramento da condição e validar o modelo dinâmico com dados de vibração de um multiplicador de velocidades obtidos experimentalmente. Para tanto, foi elaborada uma metodologia baseada no modelo dinâmico de par engrenado com 6 graus de liberdade para simulação de sinais de vibração; nesse modelo, inclui-se erros geométricos no perfil do dente; de maneira analítica, simula-se uma a trinca do dente de uma das engrenagens que ocasiona a queda de rigidez em função do tempo; desenvolveu-se também um experimento com um multiplicador de velocidades; e, por fim, algumas técnic... (Resumo completo, clicar acesso eletrônico abaixo)
Abstract: Spur gears are transmission power elements widely used in machinery, however catastrophic failures of this components are just as common and onerous. Vibration analysis is a technique, in among of others, that can be used in diagnostics of incipient damages, common in predictive maintenance, because they change the dynamic behavior of the mechanical system, and the degradation state can be detected by vibration signal or noise. In the current industry production, in which real-time data acquisition - whether for processes control, or for health condition monitoring of equipment - is the reality, it is necessary to develop auxiliary methods that provide high reliability to identification, localization and failure prognostics. In this work, the main objective is to provide a spur gears’ model-based methodology for condition-monitoring and to validate a dynamic model with experimental vibration data of a gearbox. Hence, a dynamic model of spur meshing gears was developed considering a 6 degrees of freedom and time-varying meshing stiffness to simulate vibrations signals; a tooth profile error was also included; in this analytical model, a straight crack was simulated by reducing the meshing stiffness in a tooth; experiments with a gearbox experimental set were run; and, some signal processing was apllied in the vibration data. The results allowed the model validation with the comparison between simulate and experimental signals, in time-domain and frequency-domain
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Curry, Jacob Michael. « Subregion meshing for multiblock models ». Thesis, Queen's University Belfast, 2000. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.322619.

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Hoogendoorn, Corné. « A statistical dynamic cardiac atlas for the virtual physiological human : construction and application ». Doctoral thesis, Universitat Pompeu Fabra, 2014. http://hdl.handle.net/10803/132632.

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This thesis is centered on the construction of a cardiac atlas to serve as a common reference frame in the Virtual Physiological Human (VPH). The construction covers the entire construction pipeline, starting from a set of 3D+t multislice computed tomography images, then performing a spatial normalization of these images, segmentation of the synthesized mean image, multi-structure meshing, and finally mapping of the mesh back to the population of images. In addition, two applications are presented in this thesis. First, the atlas is used to frame a spatio-temporal model of cardiac morphology which models the variability along both 'axes' simultaneously. Such a unified approach should be preferable over existing methods, which decouple the two sources of variation and then model them separately, in isolation. Second, the proposed atlas is applied to develop an acceleration technique for performing personalized simulation of cardiac electrophysiology (EP). The prior knowledge encapsulated in our atlas is used, in conjunction with a numerical solver of cardiac EP, to build a statistical model linking cardiac morphology with the steady states of myocardial cell models that pre condition detailed cardiac EP simulations. This application puts the proposed dynamic cardiac atlas in the context of VPH-related simulations, of which the computational costs are currently greatly in excess of what is acceptable for their adoption in current clinical practice.
Esta tesis está centrada en la construcción de un atlas cardiaco, para servir como marco común de referencia en el Virtual Physiological Human (VPH). La construcción consiste en la trayectoria completa, empezando con un conjunto de imágenes 3D+t de tomografía computacional multi-corte, y entonces hacer una normalización espacial de las imágenes, segmentación de la imagen promedio sintetizada, un mallado multi-estructura, y finalmente la transformación de la malla a la población de imágenes. Adicionalmente, la tesis presenta dos aplicaciones del atlas. Primero, el atlas se usa para enmarcar un modelo espacio-temporal de la morfología cardiaca que modela la variación a lo largo de ambos 'ejes' simultáneamente. Tal propuesta debe ser preferible sobre otros m\'etodos existentes, los cuales desacoplan las dos fuentes de variación para modelarlas separadamente, en isolación. Segundo, el atlas está aplicado al desarrollo de una técnica de aceleración para simulaciones personalizadas de electrofisiología (EF) cardiaca. El conocimiento previo encapsulado en nuestro atlas se usa, en conjunto con un solver de EF cardiaca, para construir un modelo estadístico conectando morfología cardiaca con los steady states de modelos celulares del miocardio que precondicionan a simulaciones detalladas de EF cardiaca. Esta aplicación posiciona el propuesto atlas dinámico cardiaco en el contexto de simulaciones relacionadas al VPH, cuyo costo computacional actual está en gran exceso de lo aceptable para su adopción en la práctica clínica de hoy en día.
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Kasmai, Naser Talon Shamsi. « Solution adaptive meshing strategies for flows with vortices ». Master's thesis, Mississippi State : Mississippi State University, 2008. http://library.msstate.edu/etd/show.asp?etd=etd-07082008-134106.

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Roulois, Guillaume. « Etude et simulation du bruit des boîtes de transmission principales d'hélicoptères ». Thesis, Dijon, 2011. http://www.theses.fr/2011DIJOS105.

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La boîte de transmission principale (BTP) est une des principales sources dubruit perçu dans les cabines d’hélicoptères et pénalise fortement le confort acoustique deséquipages et passagers. Afin de réduire l’impact de cette source, les phénomènes acoustiqueset vibratoires mis en jeu par les boîtes de transmission à engrenages doivent être compris etsimulés durant les phases de développement. De cette façon, le comportementvibroacoustique des BTP pourra être amélioré dès la conception, réduisant ainsi le coût, lamasse et les difficultés d’intégration des solutions d’insonorisation. Ce travail présente lesBTP d’hélicoptères ainsi que le bruit qu’elles génèrent. Il présente également nosdéveloppements concernant la modélisation du comportement dynamique des BTP afin d’encalculer le bruit. Nous avons développé un code éléments finis permettant d’effectuer desétudes paramétriques afin d’ajuster le design des boîtes de transmission lors des phases dedéveloppement. Notre modèle est capable de calculer les efforts dynamiques aux paliers detransmissions composées de plusieurs engrenages cylindriques et spiro-coniques. Enfin, nousanalysons des mesures acoustiques et vibratoires effectuées autour de deux BTP pourplusieurs conditions de couple et vitesse. Ces mesures nous permettent de mieux comprendrele comportement vibroacoustique des BTP et de confirmer certaines tendances observées avecnotre modèle
Main gearbox (MGB) is one of the main noise sources in helicopter cabinsand it strongly penalizes acoustic comfort of crews and passengers. In order to reduce theimpact of this source, acoustic and vibration mechanisms of gearboxes have to be understoodand simulated during the development phases. By this way, MGB vibroacoustic behaviourcould be improved by design, thus reducing cost, additional weight and integration difficultiesof sound-proofing solutions. This work presents helicopters MGB and the noise they generate.It also presents our developments regarding the modelling of MGB dynamic behaviour fornoise computation. We have developed a finite elements code allowing to conduct parametricstudies to tune the gearboxes design in early development phases. Our model is able tocompute dynamic loads on bearings of any transmission composed of several cylindrical andspiral bevel gears. At last, we analyse acoustic and vibration measurements done around twoMGB for several conditions of torque and speed. These measurements allow to betterunderstand MGB vibroacoustic behaviour and to confirm some trends observed with ourmodel
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Zhou, Chunfeng. « Simulations of interfacial dynamics of complex fluids using diffuse interface method with adaptive meshing ». Thesis, University of British Columbia, 2008. http://hdl.handle.net/2429/1062.

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A diffuse-interface finite-element method has been applied to simulate the flow of two-component rheologically complex fluids. It treats the interfaces as having a finite thickness with a phase-field parameter varying continuously from one phase to the other. Adaptive meshing is applied to produce fine grid near the interface and coarse mesh in the bulk. It leads to accurate resolution of the interface at modest computational costs. An advantage of this method is that topological changes such as interfacial rupture and coalescence happen naturally under a short-range force resembling the van der Waals force. There is no need for manual intervention as in sharp-interface model to effect such event. Moreover, this energy-based formulation easily incorporates complex rheology as long as the free energy of the microstructures is known. The complex fluids considered in this thesis include viscoelastic fluids and nematic liquid crystals. Viscoelasticity is represented by the Oldroyd-B model, derived for a dilute polymer solution as linear elastic dumbbells suspended in a Newtonian solvent. The Leslie-Ericksen model is used for nematic liquid crystals，which features distortional elasticity and viscous anisotropy. The interfacial dynamics of such complex fluids are of both scientific and practical significance. The thesis describes seven computational studies of physically interesting problems. The numerical simulations of monodisperse drop formation in microfluidic devices have reproduced scenarios of jet breakup and drop formation observed in experiments. Parametric studies have shown dripping and jetting regimes for increasing flow rates, and elucidated the effects of flow and rheological parameters on the drop formation process and the final drop size. A simple liquid drop model is used to study the neutrophil, the most common type of white blood cell, transit in pulmonary capillaries. The cell size, viscosity and rheological properties are found to determine the transit time. A compound drop model is also employed to account for the cell nucleus. The other four cases concern drop and bubble dynamics in nematic liquid crystals, as determined by the coupling among interfacial anchoring, bulk elasticity and anisotropic viscosity. In particular, the simulations reproduce unusual bubble shapes seen in experiments, and predict self-assembly of microdroplets in nematic media.
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Livres sur le sujet "Dynamic meshing"

1

Institute for Computer Applications in Science and Engineering., dir. Multigrid solution strategies for adaptive meshing problems. Hampton, VA : Institute for Computer Applications in Science and Engineering, NASA Langley Research Center, 1995.

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2

Institute for Computer Applications in Science and Engineering., dir. Adaptive meshing techniques for viscous flow calculations on mixed element unstructured meshes. Hampton, VA : Institute for Computer Applications in Science and Engineering, NASA Langley Research Center, 1997.

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3

Mavriplis, Dimitri. Adaptive meshing techniques for viscous flow calculations on mixed element unstructured meshes. Hampton, VA : Institute for Computer Applications in Science and Engineering, NASA Langley Research Center, 1997.

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Chapitres de livres sur le sujet "Dynamic meshing"

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Foteinos, Panagiotis, et Nikos Chrisochoides. « Dynamic Parallel 3D Delaunay Triangulation ». Dans Proceedings of the 20th International Meshing Roundtable, 3–20. Berlin, Heidelberg : Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-24734-7_1.

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Blayo, Eric, Laurent Debreu, Grégory Mounié et Denis Trystram. « Dynamic Load Balancing for Ocean Circulation Model with Adaptive Meshing ». Dans Euro-Par’99 Parallel Processing, 303–12. Berlin, Heidelberg : Springer Berlin Heidelberg, 1999. http://dx.doi.org/10.1007/3-540-48311-x_39.

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Filgueira da Silva, Samuel, Jony J. Eckert, Áquila Chagas de Carvalho, Fabio Mazzariol Santiciolli, Ludmila C. A. Silva et Franco Giuseppe Dedini. « Multi-body Dynamics Co-simulation of Planetary Gear Train for Dynamic Meshing Force Analysis ». Dans Multibody Mechatronic Systems, 159–67. Cham : Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-60372-4_18.

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Curà, Francesca, et Carlo Rosso. « Modelling of Gear Meshing : A Numerical Approach for Dynamic Behavior Estimation of Thin Gears ». Dans Topics in Nonlinear Dynamics, Volume 1, 319–33. New York, NY : Springer New York, 2013. http://dx.doi.org/10.1007/978-1-4614-6570-6_29.

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Xu, Rui, Jing Zhang, Jiugen Wang, Renjun Li et Peicheng Shi. « Nonlinear Dynamic Modelling and Analysis for a High Contact Ratio Spur Gear Pair Considering the Meshing State of Multiple Pairs of Teeth ». Dans Advances in Mechanical Design, 2259–72. Singapore : Springer Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-7381-8_140.

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Diestmann, Thomas, Nils Broedling, Benedict Götz et Tobias Melz. « Surrogate Model-Based Uncertainty Quantification for a Helical Gear Pair ». Dans Lecture Notes in Mechanical Engineering, 191–207. Cham : Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-77256-7_16.

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AbstractCompetitive industrial transmission systems must perform most efficiently with reference to complex requirements and conflicting key performance indicators. This design challenge translates into a high-dimensional multi-objective optimization problem that requires complex algorithms and evaluation of computationally expensive simulations to predict physical system behavior and design robustness. Crucial for the design decision-making process is the characterization, ranking, and quantification of relevant sources of uncertainties. However, due to the strict time limits of product development loops, the overall computational burden of uncertainty quantification (UQ) may even drive state-of-the-art parallel computing resources to their limits. Efficient machine learning (ML) tools and techniques emphasizing high-fidelity simulation data-driven training will play a fundamental role in enabling UQ in the early-stage development phase.This investigation surveys UQ methods with a focus on noise, vibration, and harshness (NVH) characteristics of transmission systems. Quasi-static 3D contact dynamic simulations are performed to evaluate the static transmission error (TE) of meshing gear pairs under different loading and boundary conditions. TE indicates NVH excitation and is typically used as an objective function in the early-stage design process. The limited system size allows large-scale design of experiments (DoE) and enables numerical studies of various UQ sampling and modeling techniques where the design parameters are treated as random variables associated with tolerances from manufacturing and assembly processes. The model accuracy of generalized polynomial chaos expansion (gPC) and Gaussian process regression (GPR) is evaluated and compared. The results of the methods are discussed to conclude efficient and scalable solution procedures for robust design optimization.
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Zhao, Guang, Juncong Su, Jingyu Zhai, Qingkai Han et Yanyan Shi. « Study on Nonlinear Meshing Stiffness of Spline ». Dans Proceedings of the 9th IFToMM International Conference on Rotor Dynamics, 1315–21. Cham : Springer International Publishing, 2015. http://dx.doi.org/10.1007/978-3-319-06590-8_107.

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Gusman, Marshall R., Jeffrey A. Housman et Cetin C. Kiris. « Adjoint-Based Adaptive Meshing in a Shape Trade Study for Rocket Ascent ». Dans Computational Fluid Dynamics 2010, 391–400. Berlin, Heidelberg : Springer Berlin Heidelberg, 2011. http://dx.doi.org/10.1007/978-3-642-17884-9_49.

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Burda, Pavel, Jaroslav Novotný et Bedřich Sousedík. « A Posteriori Error Estimates and Adaptive Meshing Applied to Flow in Channels with Corners ». Dans Computational Fluid Dynamics 2002, 465–70. Berlin, Heidelberg : Springer Berlin Heidelberg, 2003. http://dx.doi.org/10.1007/978-3-642-59334-5_69.

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Dai, Jianing, Yulin Yan, Erhao Li, Zhengyu Gong, Ling Zhang et Zhixing Gu. « Study on the 3-D Natural Circulation Characteristics of LFR Under Steady State by Using Ansys Fluent ». Dans Springer Proceedings in Physics, 930–40. Singapore : Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-99-1023-6_79.

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AbstractAs one of the Generation IV reactors, Lead-based Fast Reactor (LFR) has been considered to be great promising owing to its advantages in nuclear safety, sustainable development of nuclear energy and nuclear waste disposal. Owing to the excellent thermal expansion characteristics of Lead-based coolant materials, the primary cooling system of LFR can operate in natural circulation driven mode. The CFD (Computational Fluid Dynamics)-based thermal-hydraulics and safety analyses of nuclear reactors, especially liquid metal pool-type reactors have attracted great attentions in recent years. In this paper, the entire 3-D geometric model of a 10 MWth natural circulation driven LFR primary cooling system was established and simulated by ANSYS Fluent, in which the mesh was partitioned by utilizing structured meshing technology, and the porous medium model was utilized to fine the reactor core simulation. The results showed that the above LFR can operate safely in natural circulation mode, and has excellent natural circulation characteristics for the primary cooling system.
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Actes de conférences sur le sujet "Dynamic meshing"

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Cai, Chen, Shi Quan, Wang Guangyan, Ge Hongyu et He Zewen. « Dynamic simulation of meshing force in broken tooth involute gear meshing process based on ADAMS ». Dans 2015 34th Chinese Control Conference (CCC). IEEE, 2015. http://dx.doi.org/10.1109/chicc.2015.7261027.

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Li, Ruihua, Ruihua Ding et Feng Wang. « Dynamic Simulation Analysis of the Translational Meshing Motor ». Dans 2011 International Conference on Intelligent Human-Machine Systems and Cybernetics (IHMSC). IEEE, 2011. http://dx.doi.org/10.1109/ihmsc.2011.98.

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Snyder, Deryl, Evangelos Koutsavdis et John Anttonen. « Transonic Store Separation Using Unstructured CFD with Dynamic Meshing ». Dans 33rd AIAA Fluid Dynamics Conference and Exhibit. Reston, Virigina : American Institute of Aeronautics and Astronautics, 2003. http://dx.doi.org/10.2514/6.2003-3919.

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Sathyanarayana, Nidhi D., et Klaus Hoffmann. « Trajectory Prediction Using Coupled CFD-RBD with Dynamic Meshing ». Dans AIAA Scitech 2019 Forum. Reston, Virginia : American Institute of Aeronautics and Astronautics, 2019. http://dx.doi.org/10.2514/6.2019-2304.

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Li, Qiang, Zhiwei Wang, Zehua Hu, Zhilai Lu et Rui Lu. « Dynamic Analysis and Vibration Research of Point Meshing Gear System ». Dans 2022 IEEE International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale (3M-NANO). IEEE, 2022. http://dx.doi.org/10.1109/3m-nano56083.2022.9941628.

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Xie, M., F. M. L. Amirouche et M. Valco. « Dynamic Analysis of Gear Meshing Teeth Using Modified Timoshenko Beam Theory ». Dans ASME 1992 Design Technical Conferences. American Society of Mechanical Engineers, 1992. http://dx.doi.org/10.1115/detc1992-0057.

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Abstract An explicit dynamical formulation of the gear meshing teeth using modified Timoshenko beam theory is presented in this paper. The acting position direction and magnitude of the external force is assumed time variant. The meshing tooth is modeled as a cantilever beam where the inertia forces due to the large rotation of the tooth base, as well as the external equivalent axial force and moment are all included in the equations of motion. Computer algorithms for gear dynamics based on the theory developed is presented. In the numerical simulations, the involute for the gear tooth profile is considered.
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Chen, Siyu, Jinyuan Tang et Xin Liu. « The Dynamic Transmission Error and the Tooth Meshing Force Based on ANSYS/LS-DYNA ». Dans ASME 2007 International Design Engineering Technical Conferences and Computers and Information in Engineering Conference. ASMEDC, 2007. http://dx.doi.org/10.1115/detc2007-34717.

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Two dynamic models of meshing contact in gear transmission are established. The transient dynamic characteristics of the gear transmission along line of action were analyzed based on deformable-body model and discrete parameter model. The curves on the displacement, the speed and the meshing force of the gear tooth meshing node with the change of time were gotten. Dynamic transmission error curves and teeth loads were computed within a wide range of rotational speed for different torques and working conditions with and without friction force. The results of the dynamic transmission error and dynamic teeth loads are validated by comparing the calculating results with that of the former experimental data. The research provides basic data for analyzing the gear impact and predicting the fatigue life of gear tooth, and it is also beneficial for the optimum design of gear parameters and the understanding of the dynamic phenomenon of gear meshing impact.
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De Smet, M., H. Van Brussel et P. Sas. « FE Meshing Tool for the Dynamic Analysis of Beam-Like Structures ». Dans ASME 1991 Design Technical Conferences. American Society of Mechanical Engineers, 1991. http://dx.doi.org/10.1115/detc1991-0282.

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Abstract This paper outlines a methodology for the automatic creation of finite element meshes used for calculating structural dynamic behaviour. Starting from the idealized geometry of the structure, the proposed Intelligent Meshing Tool determines a mesh density that a priori guarantees the resonant frequencies to be calculated within predetermined accuracy limits. Unlike most existing techniques for automatic meshing, this technique is not inherently adaptive, but does not exclude an extra adaptive mesh refinement step, either. Implementation of this methodology is discussed for structures composed of straight uniform, curved and tapered beam-like components. The feasibility of the meshing strategy is illustrated by means of an example.
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Hong, Jie, XiRu Xu, LiMing Jiang et YanHong Ma. « Vibration Characteristics of Rotor System Considering Gear Meshing ». Dans ASME Turbo Expo 2019 : Turbomachinery Technical Conference and Exposition. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/gt2019-91445.

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Abstract Spiral bevel gears are essential units in the accessories system of the aero-engine. The rotor transmits torque to the accessories system through the spiral bevel gears, which also change the direction of rotation. With the wide application of elastic support and the reduction in the number of bearing frames, the fulcrum stiffness and the rotor shaft stiffness is on the same order of magnitude of the gear meshing stiffness. For these multi-axis gear transmission systems, the effects of time-varying relative displacement between the gear meshing points and its additional constraint on the dynamic characteristics of the rotor ought be considered. In this paper, a coupled mechanical model of the bevel gear-coupled two-shaft rotor system is established. Besides, the coupled vibration mode of the gear-rotor system is studied. Finally, the influence of nonlinearity relative displacement and its additional constraint on the vibration characteristics of the rotor system are analyzed. The results show that the driven gear will produce elastic additional constraint on the rotor under the specific vibration mode. When the gear meshing stiffness is on the same magnitude as the support stiffness of the rotor, and the relative vibration displacement between the driving and driven gears is large enough, it is necessary to consider the influence of additional constraints on the rotor dynamics. The analysis in this paper provide a reference for dynamic optimization designs, fault monitoring and diagnosis of gear-rotor systems.
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Pearson, Connor, Tom Allen et Mark Battley. « Numerical Water Impacts of 2D Hull Forms Using Dynamic Overset Meshing ». Dans SNAME 24th Chesapeake Sailing Yacht Symposium. SNAME, 2022. http://dx.doi.org/10.5957/csys-2022-016.

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The phenomenon of ’slamming’ is often the critical design load for high-performance marine craft. Slamming involves the solid-fluid impact of a hull structure, resulting in large forces acting on the structure due to the large volume of water displaced quickly. Due to its importance in the design and operation of marine craft, the impact of hull sections into water has been the focus of a significant body of research. These studies have primarily focused on rigid shapes, so the effects of hydroelasticity have not been examined in detail. This paper presents a robust and practical methodology for water impacts involving overset meshing and the VOF method using the FLUENT solver. The framework involves a high resolution dynamic overset mesh attached to the body in a coarse static Cartesian background mesh. Results for a simple 2D wedge impact are compared to experimental, analytical, and numerical results and an excellent agreement to the validation material is observed. Finally, a 2D transverse section based on the ORMA60 racing yacht Banque Populaire VIII was studied. This methodology is used to obtain impact force and pressures. It is applicable for designers of high-performance sailing craft to improve the prediction of hydrodynamic loading on their hull-form designs. The work carried out in this study is part of an ongoing PhD investigating existing and proposed structural design configurations for high-speed marine craft and analysing failure mechanisms under slamming events. Various structural configurations will be analysed using the framework outlined in this paper.
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Rapports d'organisations sur le sujet "Dynamic meshing"

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Zukas, Jonas A., et Daniel R. Scheffler. Practical Aspects of Numerical Simulations of Dynamic Events : Effects of Meshing. Fort Belvoir, VA : Defense Technical Information Center, septembre 2000. http://dx.doi.org/10.21236/ada384433.

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Duque, Earl, Steve Legensky, Brad Whitlock, David Rogers, Andrew Bauer, Scott Imlay, David Thompson et Seiji Tsutsumi. Summary of the SciTech 2020 Technical Panel on In Situ/In Transit Computational Environments for Visualization and Data Analysis. Engineer Research and Development Center (U.S.), juin 2021. http://dx.doi.org/10.21079/11681/40887.

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At the AIAA SciTech 2020 conference, the Meshing, Visualization and Computational Environments Technical Committee hosted a special technical panel on In Situ/In Transit Computational Environments for Visualization and Data Analytics. The panel brought together leading experts from industry, software vendors, Department of Energy, Department of Defense and the Japan Aerospace Exploration Agency (JAXA). In situ and in transit methodologies enable Computational Fluid Dynamic (CFD) simulations to avoid the excessive overhead associated with data I/O at large scales especially as simulations scale to millions of processors. These methods either share the data analysis/visualization pipelines with the memory space of the solver or efficiently off load the workload to alternate processors. Using these methods, simulations can scale and have the promise of enabling the community to satisfy the Knowledge Extraction milestones as envisioned by the CFD Vision 2030 study for "on demand analysis/visualization of a 100 Billion point unsteady CFD simulation". This paper summarizes the presentations providing a discussion point of how the community can achieve the goals set forth in the CFD Vision 2030.
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Pointer, William David. Reference Computational Meshing Strategy for Computational Fluid Dynamics Simulation of Departure from Nucleate Boiling. Office of Scientific and Technical Information (OSTI), juillet 2017. http://dx.doi.org/10.2172/1424433.

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