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Letteratura scientifica selezionata sul tema "Hydrostatic models"

Autore: Grafiati

Pubblicato: 26 ottobre 2024

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Articoli di riviste sul tema "Hydrostatic models"

Hasegawa, Tatsuhiko. "Hydrostatic models of Bok globules". Astrophysics and Space Science 119, n. 1 (gennaio 1986): 151–54. http://dx.doi.org/10.1007/bf00648835.

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White, A. A., B. J. Hoskins, I. Roulstone e A. Staniforth. "Consistent approximate models of the global atmosphere: shallow, deep, hydrostatic, quasi-hydrostatic and non-hydrostatic". Quarterly Journal of the Royal Meteorological Society 131, n. 609 (1 luglio 2005): 2081–107. http://dx.doi.org/10.1256/qj.04.49.

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Gibbon, J. D., e D. D. Holm. "Extreme events in solutions of hydrostatic and non-hydrostatic climate models". Philosophical Transactions of the Royal Society A: Mathematical, Physical and Engineering Sciences 369, n. 1939 (28 marzo 2011): 1156–79. http://dx.doi.org/10.1098/rsta.2010.0244.

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Initially, this paper reviews the mathematical issues surrounding hydrostatic primitive equations (HPEs) and non-hydrostatic primitive equations (NPEs) that have been used extensively in numerical weather prediction and climate modelling. A new impetus has been provided by a recent proof of the existence and uniqueness of solutions of viscous HPEs on a cylinder with Neumann-like boundary conditions on the top and bottom. In contrast, the regularity of solutions of NPEs remains an open question. With this HPE regularity result in mind, the second issue examined in this paper is whether extreme events are allowed to arise spontaneously in their solutions. Such events could include, for example, the sudden appearance and disappearance of locally intense fronts that do not involve deep convection. Analytical methods are used to show that for viscous HPEs, the creation of small-scale structures is allowed locally in space and time at sizes that scale inversely with the Reynolds number.

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Deupree, Robert G. "Multidimensional Hydrodynamic and Hydrostatic Stellar Models". Symposium - International Astronomical Union 215 (2004): 378–87. http://dx.doi.org/10.1017/s0074180900195919.

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Results for multidimensional stellar model simulations of both 2D and 3D hydrodynamic models and 2D stellar evolution sequences are presented. Simulations of the highly superadiabatic region of the solar convective region provide a good example of the current status and limitations of explicit 3D finite difference methods in stellar problems. Such simulations cannot be used for stellar cores, where the motion is expected to be well subsonic. The results of some 2D fully implcit hydrodynamic simulations of convective cores and shells are given for models with and without rotation, and their effects examined through fully 2D stellar evolution sequences. One effect of moderate to rapid rotation in convective cores is to alter the convective flow pattern so that convective eddies tend to line up parallel to the rotation axis. Rotation also appears to modestly reduce the amount of convective core overshooting, at least for intermediate mass models.

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Duffy, Dean G. "Hydrostatic Adjustment in Nonhydrostatic, Compressible Mesoscale Models". Monthly Weather Review 125, n. 12 (dicembre 1997): 3357–67. http://dx.doi.org/10.1175/1520-0493(1997)125<3357:haincm>2.0.co;2.

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Ascasibar, Y., A. C. Obreja e A. I. Díaz. "Hydrostatic photoionization models of the Orion Bar". Monthly Notices of the Royal Astronomical Society 416, n. 2 (11 luglio 2011): 1546–55. http://dx.doi.org/10.1111/j.1365-2966.2011.19151.x.

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Zingale, M., L. J. Dursi, J. ZuHone, A. C. Calder, B. Fryxell, T. Plewa, J. W. Truran et al. "Mapping Initial Hydrostatic Models in Godunov Codes". Astrophysical Journal Supplement Series 143, n. 2 (dicembre 2002): 539–65. http://dx.doi.org/10.1086/342754.

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Guerra, Jorge E., e Paul A. Ullrich. "A high-order staggered finite-element vertical discretization for non-hydrostatic atmospheric models". Geoscientific Model Development 9, n. 5 (1 giugno 2016): 2007–29. http://dx.doi.org/10.5194/gmd-9-2007-2016.

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Abstract. Atmospheric modeling systems require economical methods to solve the non-hydrostatic Euler equations. Two major differences between hydrostatic models and a full non-hydrostatic description lies in the vertical velocity tendency and numerical stiffness associated with sound waves. In this work we introduce a new arbitrary-order vertical discretization entitled the staggered nodal finite-element method (SNFEM). Our method uses a generalized discrete derivative that consistently combines the discontinuous Galerkin and spectral element methods on a staggered grid. Our combined method leverages the accurate wave propagation and conservation properties of spectral elements with staggered methods that eliminate stationary (2Δx) modes. Furthermore, high-order accuracy also eliminates the need for a reference state to maintain hydrostatic balance. In this work we demonstrate the use of high vertical order as a means of improving simulation quality at relatively coarse resolution. We choose a test case suite that spans the range of atmospheric flows from predominantly hydrostatic to nonlinear in the large-eddy regime. Our results show that there is a distinct benefit in using the high-order vertical coordinate at low resolutions with the same robust properties as the low-order alternative.

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Savoulides, N., K. S. Breuer, S. Jacobson e F. F. Ehrich. "Low-Order Models for Very Short Hybrid Gas Bearings". Journal of Tribology 123, n. 2 (16 giugno 2000): 368–75. http://dx.doi.org/10.1115/1.1308000.

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A low-order model was created to analyze a small-scale gas bearing with a diameter of 4.1 mm, designed to spin at 2.4 million rpm. Due to microfabrication constraints, the bearing lies outside the standard operating space and stable operation is a challenge. The model is constructed by reference to Newton’s second law for the rotor and employs stiffness and damping coefficients predicted by other models. At any operating point it is able to predict (1) whether the journal can sustain stable operation, and (2) the whirling frequency of the journal. Analysis shows that the best way to operate the bearing is in a hybrid mode where the bearing relies on hydrostatics at low speeds and hydrodynamics at high speeds. However, in transitioning from hydrostatic to hydrodynamic operation, the model shows that the bearing is prone to instability problems and great care must be taken in scheduling the bearing pressurization system in the course of accelerating through low and intermediate rotational speeds.

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Kållberg, P., e A. Montani. "A case study carried out with two different NWP systems". Natural Hazards and Earth System Sciences 6, n. 5 (4 settembre 2006): 755–60. http://dx.doi.org/10.5194/nhess-6-755-2006.

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Abstract. A model intercomparison between two atmospheric models, the non–hydrostatic Lokal Modell (LM) and the hydrostatic HIgh Resolution Limited Area Model (HIRLAM) is carried out for a one-week period, including a case of cyclogeneis leading to heavy precipitation over Northern Italy. The two models, very different in terms of data-assimilation and numerics, provide different results in terms of forecasts of surface fields. Opposite diurnal biases for the two models are found in terms of screen level temperatures. HIRLAM wind speed forecasts are too strong, while LM precipitation forecasts have larger extremes. The intercomparison exercise identifies some systematic differences in the weather products generated by the two systems and sheds some light on the biases of the two numerical weather prediction systems.

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Tesi sul tema "Hydrostatic models"

Ye, Feng. "Derivation of a two-layer non-hydrostatic shallow water model". Thesis, Water Resources Research Center, University of Hawaii at Manoa, 1995. http://hdl.handle.net/10125/21919.

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A theoretical non-hydrostatic model is developed to describe the dynamics of a two-layer shallow water system in the presence of viscous and Coriolis effects. The Navier-Stokes equations are integrated over the water depth in each layer to obtain the layer-mean equations. To close the resulting equation set, perturbation expansions of the vertical momentum equation are used and the dynamic pressures are solved in terms of wave elevations and horizontal velocities. A preliminary analysis is also carried out and a result for the quasigeostrophic problems is given based on an previous study. Our final model is of the Bousinesq class which is nonlinear and dispersive, and includes the effects of surface wind stress, bottom friction, eddy diffusion and earth rotation. It is shown that our new model can be readily reduced to previous inviscid non-hydrostatic models. Our model can be used in numerical simulations to study real ocean problems such as hurricane generated waves, tidal induced current, and interactions among surface waves, internal waves and variable topographies.
Thesis (M. S.)--University of Hawaii at Manoa, 1995.
Includes bibliographical references (leaves 55-59).
UHM: Has both book and microform.
U.S. Geological Survey; project no. 06; grant agreement no. 14-08-0001-G2015

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Zhang, Yuli. "Free wobble/nutation of the earth : a new approach for hydrostatic earth models /". Thesis, National Library of Canada = Bibliothèque nationale du Canada, 1998. http://www.collectionscanada.ca/obj/s4/f2/dsk2/tape17/PQDD_0008/MQ34243.pdf.

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League, Richard B. "Bond graph model and computer simulation of a hydrostatic drive test stand". Thesis, Virginia Polytechnic Institute and State University, 1985. http://hdl.handle.net/10919/50042.

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A hydrostatic drive test stand was constructed to aid in the instruction of the characteristics of hydrostatic transmissions and to develop a time-varying load in a shaft to compare torque transducers. A mathematical model of the device was derived using the bond graph approach and was implemented using the Advanced Continuous Simulation Language (ACSL). The test stand was used to obtain experimental data to try to refine the model parameters. To facilitate the measurement of system flows, a microprocessor-based digital flow indicator was developed. Steady-state tests were performed at various constant pump swashplate angles; for the dynamic tests, the pump swashplate angle was cycled from zero degrees to 6.5 degrees.
Master of Science
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Gonzaga, F. Luis F. "Static pressure drop as affected by moisture and foreign material in rough rice". Thesis, Kansas State University, 1985. http://hdl.handle.net/2097/9843.

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Bulian, Gabriele. "DEVELOPMENT OF ANALYTICAL NONLINEAR MODELS FOR PARAMETRIC ROLL AND HYDROSTATIC RESTORING VARIATIONS IN REGULAR AND IRREGULAR WAVES". Doctoral thesis, Università degli studi di Trieste, 2006. http://hdl.handle.net/10077/2518.

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2004/2005
Parametrically excited roll motion has become a relevant technical issue, especially in recent years, due the increasing number of accidents related to this phenomenon. For this reason, its study has attracted the interest of researchers, regulatory bodies and classification societies. The objective of this thesis is the developing of nonlinear analytical models able to provide simplified tools for the analysis of parametrically excited roll motion in longitudinal regular and irregular long crested waves. The sought models will take into account the nonlinearities of restoring and of damping, in order to try filling the gap with the analytical modelling in beam sea. In addition, semi-empirical methodologies will be provided to try extending the usual static approach to ship stability based on the analysis of GZ curve, in a probabilistic framework where the propensity of the ship to exhibit restoring variations in waves is rationally accounted for. The thesis addresses three main topics: the modelling of parametric roll in regular sea (Chapter 2 to Chapter 5), the modelling of parametric roll motion in irregular long crested sea (Chapter 6 and Chapter 7) and the extension of deterministic stability criteria based on the analysis of geometrical GZ curve properties to a probabilistic framework (Chapter 8). Chapter 1 gives an introduction, whereas Chapter 9 reports a series of final remarks. For the regular sea case an analytical model is developed and analysed both in time domain and in frequency domain. In this latter case an approximate analytical solution for the nonlinear response curve in the first parametric resonance region is provided by using the approximate method of averaging. Prediction are compared with experimental results for four ships, and the analytical model is investigated with particular attention to the presence of multiple stable steady states and the inception of chaotic motions. The influence of harmonic components higher than the first one in the fluctuation of the restoring is also investigated. In the case of irregular sea, the Grim's effective wave concept is used to develop an analytical model for the long crested longitudinal sea condition, that allows for an approximate analytical determination of the stochastic stability threshold in the first parametric resonance region. Experimental results are compared with Monte Carlo simulations on a single ship, showing the necessity of a tuning factor reducing the hydrostatically predicted magnitude of parametric excitation. The non-Gaussianity of parametrically excited roll motion is also discussed. Finally, on the basis of the analytical modelling of the restoring term in irregular waves, an extension of the classical deterministic approach to ship static stability in calm water is proposed, to take into account, although is a semi-empirical form, restoring variations in waves. Classical calm water GZ curve is then extended from a deterministic quantity to a stochastic process. By limiting the discussion to the instantaneous ensemble properties of this process, it is shown how it is possible to extend any static stability criterion based on the geometrical properties of the GZ curve, in a rational probabilistic framework taking into account the actual operational area of the ship and the propensity of the ship to show restoring variations in waves. General measures of restoring variations are also discussed, such as the coefficient of variation of metacentric height, restoring lever and area under GZ. Both the short-term and long-term point of view are considered, and the method is applied to three different ships in different geographical areas.

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Minář, Petr. "Návrh a optimalizace prostoru hydrostatické kapsy". Master's thesis, Vysoké učení technické v Brně. Fakulta strojního inženýrství, 2011. http://www.nusl.cz/ntk/nusl-229483.

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This diploma thesis deals with an optimization of hydrostatic slide of the large-portal gantry machine FRU (TOS Kuřim). First part of the thesis concerns with an analysis of the current practice in hydrostatic guides in the field of heavy gantry machines, an usage of alternative materials for a construction of carrying parts of machines, and possibilities of current simulation methods. Aim of the second part of this thesis is a brief clarification of the principle of mathematical optimization, and creation of general methodology of construction optimization by means of system analysis. Optimization calculations were processed by ANSYS Workbench 11.0. There is achieved adjusted and optimized design of the hydrostatic slide as the result of the thesis. Moreover, the comparison of key deformations was added. Created methodology is applicable in both an area of construction of gantry machines, and a wide spectrum of construction fields.

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Miller, Adam Charles. "Assessment of Alternate Viscoelastic Contact Models for a Bearing Interface between an Axial Piston Pump Swash Plate and Housing". The Ohio State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=osu1403274866.

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Carlsson, Erik. "Modeling Hydrostatic Transmission in Forest Vehicle". Thesis, Linköping University, Department of Electrical Engineering, 2006. http://urn.kb.se/resolve?urn=urn:nbn:se:liu:diva-6864.

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Hydrostatic transmission is used in many applications where high torque at low speed is demanded. For this project a forest vehicle is at focus. Komatsu Forest would like to have a model for the pressure in the hose between the hydraulic pump and the hydraulic motor. Pressure peaks can arise when the vehicle changes speed or hit a bump in the road, but if a good model is achieved some control action can be developed to reduce the pressure peaks.

For simulation purposes a model has been developed in Matlab-Simulink. The aim has been to get the simulated values to agree as well as possible with the measured values of the pressure and also for the rotations of the pump and the motor.

The greatest challenge has been due to the fact that the pressure is a sum of two flows, if one of these simulated flows is too big the pressure will tend to plus or minus infinity. Therefore it is necessary to develop models for the rotations of the pump and the motor that stabilize the simulated pressure.

Different kinds of models and methods have been tested to achieve the present model. Physical modeling together with a black box model are used. The black box model is used to estimate the torque from the diesel engine. The probable torque from the ground has been calculated. With this setup the simulated and measured values for the pressure agrees well, but the fit for the rotations are not as good.

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Marien, Lennart Christopher [Verfasser]. "Towards well-balancing the regional hydrostatic climate model REMO / Lennart Christopher Marien". Hamburg : Staats- und Universitätsbibliothek Hamburg Carl von Ossietzky, 2019. http://d-nb.info/1229625690/34.

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Júnior, Francival Barbosa. "Analysis of electro-hydrostatic actuator in more electric aircraft". Instituto Tecnológico de Aeronáutica, 2006. http://www.bd.bibl.ita.br/tde_busca/arquivo.php?codArquivo=900.

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The aim of this dissertation is to evaluate the possibility of using electrically powered systems instead of a centralized hydraulic system composed of set of distribution pipes for aircrafts' primary control surfaces actuation. Focus will be given in the following topics: Description of new actuation technologies; Option chosen to be studied among the new possibilities; Comparison between the traditional system and the new proposal e System engineering evaluation regarding: weight, safety, thermal issue, connection with electric system, maintenance and certification. Besides that, a more electric actuation architecture will be proposed and compared with the conventional option for an airplane design's case study. A simulation model will be developed to describe the more electric actuator behavior and preview its interaction with other systems. This model will be included in a closed loop to command a primary surface. The closed-loop project will be developed based on an algorithmic method. A Genetic Algorithm (GA) will be implemented to define the gains. Finally, the results obtained will be discussed.

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Libri sul tema "Hydrostatic models"

Haase, Günther. A physical initialization algorithm for non-hydrostatic weather prediction models using radar derived rain rates. St. Augustin [Germany]: Asgard Verlag, 2002.

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Castillo, Henry A. Optimum design of isotropic monocoque and ring-stiffened circular cylindrical shells subject to external hydrostatic pressure. Monterey, California: Naval Postgraduate School, 1992.

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D, Roberts Gary, Gilat Amos e NASA Glenn Research Center, a cura di. Implementation of an associative flow rule including hydrostatic stress effects into the high strain rate deformation analysis of polymer matrix composites. [Cleveland, Ohio]: National Aeronautics and Space Administration, Glenn Research Center, 2003.

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Robinson, David N. A hydrostatic stress-dependent anisotropic model of viscoplasticity. [Washington, DC]: National Aeronautics and Space Administration, 1994.

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Q, Tao, Verrilli M. J e United States. National Aeronautics and Space Administration., a cura di. A hydrostatic stress-dependent anisotropic model of viscoplasticity. [Washington, DC]: National Aeronautics and Space Administration, 1994.

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United States. National Aeronautics and Space Administration., a cura di. Observational and numerical studies of extreme frontal scale contraction: Final report, NASA project NAG 5-2589, July 1, 1994-August 31, 1995. Raleigh, NC: Dept. of Marine, Earth, and Atmospheric Sciences, North Carolina State University, 1995.

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Canada. Defence Research Establishment Atlantic. Shipmo4: An Updated User's Manual For the Shipmo Computer Program Incorporating an Extended Hydrostatics Capability and an Improved Viscous Roll Damping Model. S.l: s.n, 1987.

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Yudaev, Vasiliy. Hydraulics. ru: INFRA-M Academic Publishing LLC., 2021. http://dx.doi.org/10.12737/996354.

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The textbook corresponds to the general education programs of the general courses "Hydraulics" and "Fluid Mechanics". The basic physical properties of liquids, gases, and their mixtures, including the quantum nature of viscosity in a liquid, are described; the laws of hydrostatics, their observation in natural phenomena, and their application in engineering are described. The fundamentals of the kinematics and dynamics of an incompressible fluid are given; original examples of the application of the Bernoulli equation are given. The modes of fluid motion are supplemented by the features of the transient flow mode at high local resistances. The basics of flow similarity are shown. Laminar and turbulent modes of motion in pipes are described, and the classification of flows from a creeping current to four types of hypersonic flow around the body is given. The coefficients of nonuniformity of momentum and kinetic energy for several flows of Newtonian and non-Newtonian fluids are calculated. Examples of solving problems of transient flows by hydraulic methods are given. Local hydraulic resistances, their use in measuring equipment and industry, hydraulic shock, polytropic flow of gas in the pipe and its outflow from the tank are considered. The characteristics of different types of pumps, their advantages and disadvantages, and ways of adjustment are described. A brief biography of the scientists mentioned in the textbook is given, and their contribution to the development of the theory of hydroaeromechanics is shown. The four appendices can be used as a reference to the main text, as well as a subject index. Meets the requirements of the federal state educational standards of higher education of the latest generation. For students of higher educational institutions who study full-time, part-time, evening, distance learning forms of technological and mechanical specialties belonging to the group "Food Technology".

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author, Kreter Fabian, Archimedes e Archimedes, a cura di. Heureka!: Francisco de Mello über das Archimedische Prinzip. Hildesheim: Georg Olms Verlag, 2015.

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A hydrostatic stress-dependent anisotropic model of viscoplasticity. [Washington, DC]: National Aeronautics and Space Administration, 1994.

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Capitoli di libri sul tema "Hydrostatic models"

Satoh, Masaki. "Vertical discretization of hydrostatic models". In Atmospheric Circulation Dynamics and General Circulation Models, 572–91. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-13574-3_22.

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Hasegawa, Tatsuhiko. "Hydrostatic Models of Bok Globules". In Third Asian-Pacific Regional Meeting of the International Astronomical Union, 151–54. Dordrecht: Springer Netherlands, 1986. http://dx.doi.org/10.1007/978-94-009-4630-9_35.

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Jamet, Quentin, Etienne Mémin, Franck Dumas, Long Li e Pierre Garreau. "Toward a Stochastic Parameterization for Oceanic Deep Convection". In Mathematics of Planet Earth, 143–57. Cham: Springer Nature Switzerland, 2023. http://dx.doi.org/10.1007/978-3-031-40094-0_6.

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AbstractCurrent climate models are known to systematically overestimate the rate of deep water formation at high latitudes in response to too deep and too frequent deep convection events. We propose in this study to investigate a misrepresentation of deep convection in Hydrostatic Primitive Equation (HPE) ocean and climate models due to the lack of constraints on vertical dynamics. We discuss the potential of the Location Uncertainty (LU) stochastic representation of geophysical flow dynamics to help in the process of re-introducing some degree of non-hydrostatic physics in HPE models through a pressure correction method. We then test our ideas with idealized Large Eddy Simulations (LES) of buoyancy driven free convection with the CROCO modeling platform. Preliminary results at LES resolution exhibit a solution obtained with our Quasi-nonhydrostatic (Q-NH) model that tends toward the reference non-hydrostatic (NH) model. As compared to a pure hydrostatic setting, our Q-NH solution exhibits vertical convective plumes with larger horizontal structure, a better spatial organization and a reduced intensity of their associated vertical velocities. The simulated Mixed Layer Depth (MLD) deepening rate is however too slow in our Q-NH experiment as compared to the reference NH, a behaviour that opposes to that of hydrostatic experiments of producing too fast MLD deepening rate. These preliminary results are encouraging, and support future efforts in the direction of enriching coarse resolution, hydrostatic ocean and climate models with a stochastic representation of non-hydrostatic physics.

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Satoh, Masaki. "Basic equations of hydrostatic general circulation models". In Atmospheric Circulation Dynamics and General Circulation Models, 519–30. Berlin, Heidelberg: Springer Berlin Heidelberg, 2013. http://dx.doi.org/10.1007/978-3-642-13574-3_20.

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Carroll, John J., Luis R-Mendez-Nuñez e Saffet Tanrikulu. "Accurate Pressure Gradient Calculations in Hydrostatic Atmospheric Models". In Interactions between Energy Transformations and Atmospheric Phenomena. A Survey of Recent Research, 149–69. Dordrecht: Springer Netherlands, 1987. http://dx.doi.org/10.1007/978-94-017-1911-7_11.

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Fox-Rabinovitz, Michael S. "Computational Dispersion Properties of 3-D Staggered Grids for Hydrostatic and Non-Hydrostatic Atmospheric Models". In Notes on Numerical Fluid Mechanics (NNFM), 95–101. Wiesbaden: Vieweg+Teubner Verlag, 1996. http://dx.doi.org/10.1007/978-3-322-89838-8_13.

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Yoshizaki, Masanori, Chiashi Muroi, Hisaki Eito, Sachie Kanada, Yasutaka Wakazuki e Akihiro Hashimoto. "Simulations of Forecast and Climate Modes Using Non-Hydrostatic Regional Models". In High Resolution Numerical Modelling of the Atmosphere and Ocean, 129–39. New York, NY: Springer New York, 2008. http://dx.doi.org/10.1007/978-0-387-49791-4_8.

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Talat Odman, M., e Armistead G. Russell. "Mass Conservative Coupling of Non-Hydrostatic Meteorological Models with Air Quality Models". In Air Pollution Modeling and Its Application XIII, 651–60. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/978-1-4615-4153-0_67.

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Wolke, Ralf, Oswald Knoth e Annette Münzenberg-St.Denis. "Online Coupling of Multiscale Chemistry-Transport Models with Non-Hydrostatic Meteorological Models". In Air Pollution Modeling and Its Application XIII, 769–70. Boston, MA: Springer US, 2000. http://dx.doi.org/10.1007/978-1-4615-4153-0_98.

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Wan, L., C. Ovalle e L. Laiarinandrasana. "Modeling the mechanical response of reinforced rubber in taking into account heat build-up and hydrostatic stress". In Constitutive Models for Rubber XII, 53–58. London: CRC Press, 2022. http://dx.doi.org/10.1201/9781003310266-10.

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Atti di convegni sul tema "Hydrostatic models"

Stelling, G. S., e J. van Kester. "Efficient Non Hydrostatic Free Surface Models". In Seventh International Conference on Estuarine and Coastal Modeling. Reston, VA: American Society of Civil Engineers, 2002. http://dx.doi.org/10.1061/40628(268)46.

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Hao Sun, Thomas Meinlschmidt e Harald Aschemann. "Passivity-based control of a hydrostatic transmission with unknown disturbances". In 2014 19th International Conference on Methods & Models in Automation & Robotics (MMAR). IEEE, 2014. http://dx.doi.org/10.1109/mmar.2014.6957331.

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Coe, Ryan G., e Diana L. Bull. "Sensitivity of a Wave Energy Converter Dynamics Model to Nonlinear Hydrostatic Models". In ASME 2015 34th International Conference on Ocean, Offshore and Arctic Engineering. American Society of Mechanical Engineers, 2015. http://dx.doi.org/10.1115/omae2015-41993.

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A three dimensional time-domain model, based on Cummins equation, has been developed for an axisymmetric point absorbing wave energy converter (WEC) with an irregular cross section. This model incorporates a number of nonlinearities to accurately account for the dynamics of the device: hydrostatic restoring, motion constraints, saturation of the power-take-off force, and kinematic nonlinearities. Here, an interpolation model of the hydrostatic restoring reaction is developed and compared with a surface integral based method. The effects of these nonlinear hydrostatic models on device dynamics are explored by comparing predictions against those of a linear model. For the studied WEC, the interpolation model offers a large improvement over a linear model and is roughly two orders-of-magnitude less computationally expensive than the surface integral based method.

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Danh, Dang Ngoc, e Harald Aschemann. "Comparison of Estimator-Based Compensation Schemes for Hydrostatic Transmissions with Uncertainties". In 2018 23rd International Conference on Methods & Models in Automation & Robotics (MMAR). IEEE, 2018. http://dx.doi.org/10.1109/mmar.2018.8486052.

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Ritzke, Joran, Jens Windelberg e Harald Aschemann. "Fault detection for a hydrostatic drive chain using online parameter estimation". In 2012 17th International Conference on Methods & Models in Automation & Robotics (MMAR). IEEE, 2012. http://dx.doi.org/10.1109/mmar.2012.6347890.

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Böhle, M., Y. Gu e A. Schimpf. "Two Flow Models for Designing Hydrostatic Bearings With Porous Material". In ASME-JSME-KSME 2019 8th Joint Fluids Engineering Conference. American Society of Mechanical Engineers, 2019. http://dx.doi.org/10.1115/ajkfluids2019-4657.

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Abstract The numerical prediction of load capacity, stiffness, power loss of hydrostatic journal bearings must be performed for technical applications. In this contribution hydrostatic bearings consisting of porous material are considered. Porous hydrostatic bearings have the advantage that no pressure erosion occurs and that the flow medium can be led homogenously to the gap between shaft and bearing. It is still a problem to design such bearings because the flow in the porous material must be taken into account. There is a simple flow model (SFM) available to calculate quickly the load capacity, stiffness, power loss. This model which is based on the assumption that the flow inside the porous material is axially symmetric works well provided that the eccentricity is small (dimensionless eccentricity e/h0 < 0.5). For large eccentricities — larger than e/h0 > 0.5 the axially symmetric assumption is too strong violated and the results for load capacity, stiffness become inaccurate. Therefore an improved model was developed which is described in the present contribution. This improved model couples the Reynolds equation for hydrodynamic lubrication (REHL) with Darcy Law as it had already been done for the aforementioned fast working SFM. The improved model is not based on the axially symmetric assumption but models the flow completely inside the porous material, i.e. Darcys Law is applied for the porous material without making any assumptions. By the application of the new model, its short name is Full Darcy’s Law (FDL) Model, bearings with high eccentricities can be designed. The application of Darcys Law leads to a Laplace equation for the static pressure distribution in the porous material which is coupled with the REHL. It is described how the resulting equation system is solved by a finite difference method. In this contribution the fast working SFM is described shortly again. The main emphasis lies on the introduction of the FDL-model which needs more computer resources for designing a porous bearing than the SFM. It is explained in detail how the coupling between Darcy Law (Laplace equation) and the REHL is realized. A comparison between the results of both models is shown and the differences are interpreted. Additionally, CFD results are used in order to validate the results of the FDL-model.

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Hasebe, Masanobu, e Shigeru Tabeta. "Unsteady Buoyant Jet Simulations Using Dynamic Connection Scheme of Hydrostatic and Non-Hydrostatic Zone". In ASME 2010 29th International Conference on Ocean, Offshore and Arctic Engineering. ASMEDC, 2010. http://dx.doi.org/10.1115/omae2010-20666.

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Most of ocean models employ hydrostatic approximation because the horizontal scale is usually much larger than the vertical scale in oceanic phenomena. In hydrostatic approximation, dynamic pressure is neglected and the momentum equation in vertical direction needs not to be solved. But for the phenomena of buoyant jet from the sea bottom such as submarine groundwater discharge, hydrothermal plume and so on, hydrodynamic pressure cannot be neglected and the momentum equation of vertical direction must to be taken into account. Non-hydrostatic analysis requires so much computation time that it is usually difficult to calculate the current field in the wide ocean area by this approach. On the other hand, analysis assuming the hydrostatic approximation needs less computational time and usually gives reasonable results for large scale ocean phenomena such as tidal current. In the present study, the authors developed a new type of ocean model for multi-scale analysis, which conducts hydrostatic analysis for phenomena in wide area and non-hydrostatic analysis for the detail flow around the buoyant jet simultaneously. The application limit of hydrostatic approximation for ocean model was investigated, and a dynamic connection method of hydrostatic zone with non-hydrostatic zone was developed. By theoretical consideration employing parameter δ and ε which represent the ratio of grid size Δz to Δx and the ratio of vertical velocity to horizontal velocity, it was found that hydrostatic approximation can be applied if δε and ε2 are minute. To examine the developed method, simulations for lock-exchange problem and vertical jet under oscillating current were conducted. The result by the present model was similar to that of non-hydrostatic model in the case that hydrostatic approximation was applied on the area of δε<0.005 and ε2<0.005.

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Peres, G., F. Reale e L. Golub. "Hydrostatic models of X-ray coronal loops observed by NIXT". In Electromechanical Coupling of the Solar Atmosphere. AIP, 1992. http://dx.doi.org/10.1063/1.42871.

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Danh, Dang Ngoc, e Harald Aschemann. "Tracking Differentiator-Based Sliding Mode Velocity Control of a Hydrostatic Transmission". In 2021 25th International Conference on Methods and Models in Automation and Robotics (MMAR). IEEE, 2021. http://dx.doi.org/10.1109/mmar49549.2021.9528444.

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Aschemann, Harald, e Julia Kersten. "Observer-based decentralised control of a wind turbine with a hydrostatic transmission". In 2015 20th International Conference on Methods and Models in Automation and Robotics (MMAR ). IEEE, 2015. http://dx.doi.org/10.1109/mmar.2015.7283991.

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Rapporti di organizzazioni sul tema "Hydrostatic models"

Hodges, Ben R. Evolution of Internal Waves in Hydrostatic Models. Fort Belvoir, VA: Defense Technical Information Center, settembre 2001. http://dx.doi.org/10.21236/ada625163.

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Hodges, Ben R. Evolution of Internal Waves in Hydrostatic Models. Fort Belvoir, VA: Defense Technical Information Center, agosto 2002. http://dx.doi.org/10.21236/ada626974.

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Fan, Yalin, Zhitao Yu e Fengyan Shi. Are Hydrostatic Models Still Capable of Simulating Oceanic Fronts. Fort Belvoir, VA: Defense Technical Information Center, novembre 2016. http://dx.doi.org/10.21236/ada640860.

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Allen, John S. Effects of Turbulence Parameterization Schemes in Hydrostatic and Nonhydrostatic Shelf Circulation Models. Fort Belvoir, VA: Defense Technical Information Center, settembre 2001. http://dx.doi.org/10.21236/ada625208.

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Tandon, Samarth, Pablo Cazenave e Ming Gao. PR-328-103602-R01 Improved Site-Selection Modeling by Correlating ILI with Operational-Geotechnical Data. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), settembre 2017. http://dx.doi.org/10.55274/r0010854.

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The primary objective of the research is to establish better correlations between SCC severity and operational and geotechnical characteristics, and to develop improved models for site-selection for SCCDA excavations, hydrostatic testing or in-line inspection (ILI). This report summarizes the modeling efforts and results, gaps and direction for future studies.

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Gallacher, Patrick C. A Regional Modeling Study of the South China Sea with High Resolution Hydrostatic and Nonhydrostatic Nested Models of the Luzon Strait. Fort Belvoir, VA: Defense Technical Information Center, settembre 2007. http://dx.doi.org/10.21236/ada573055.

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Bowlin, Elizabeth, Puneet Agarwal e Rhett Dotson. PR-201-153718-R02 Integrity Assessment of DTI Pipelines Using High Resolution NDE. Chantilly, Virginia: Pipeline Research Council International, Inc. (PRCI), aprile 2018. http://dx.doi.org/10.55274/r0011480.

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This is a new revision of the Year 2 work. The NDE-3-2 project seeks to advance the state of the art for integrity assessment of difficult to inspect pipelines by proposing guidance for application of alternate inspection approaches other than hydrostatic test, in-line inspection and ECDA/ICDA currently prescribed by Code and Regulations. The hydrostatic test and in-line inspection methods for integrity assessment have in common the concept that the full length of the pipeline is assessed. Many pipelines exhibit configuration and operational issues that preclude integrity assessment by the prescribed methods. The ECDA/ICDA structured processes employ evaluation of protective barriers followed by deployment of a small sample of high resolution wall thickness measurements. The NDE-3-2 study proposes a new structured process that evaluates low resolution NDE data of the pipe wall for the full length of the pipeline followed by statistically significant numbers of high resolution wall thickness measurements to predict the condition of the pipeline relative to the fitness for service criterion of corroded pipe such as prescribed in ASME B31G. While conventional ILI inspections or hydrotest rely on full coverage as the basis for evaluating the integrity of a pipeline segment, this structured process would seek to use partial inspections at discrete locations and then use Extreme Value Analysis to estimate the integrity of pipeline segments. The objective is not to provide guidance to replace ILI or hydrostatic testing but rather to offer an alternative for the purposes of gathering data to justify the safe prioritization of piggability conversion or pipeline replacement of difficult to inspect pipelines for both onshore and subsea. This report documents the current state-of-the-art for corrosion location NDE, selection models, and Extreme Value Analysis (EVA) Methodologies for deployment in a structured process as an Alternative to In-Line Inspection of difficult to inspect pipelines. The research on NDE screening technologies addressed in this report reviews technologies identified in the Year 1 work that can be used to screen the condition of pipe wall along its full length as well as existing location selection models such as employed by Direct Assessment Methodologies. This report leverages extensive research that has been conducted on existing Extreme Value Analysis Methodologies from multiple sources and applications including metal corrosion (HOIS, HSE), pipeline corrosion, metocean criteria, wind loading, and multiple textbooks. Multiple case studies are summarized in this report that demonstrate the use of the Partial Inspection Integrity Assessment process utilizing EVA on segments of a pipeline compared to results from full length integrity assessments (either ILI or hydrotest). This report also documents a full Extreme Value Analysis using a demonstration case study and then compares the EVA results with the wall thickness measurements from a full length integrity assessment as a validation example. Ultimately, it is the goal of NDE-3-2 to identify more case studies that might serve as demonstrations. The report also identifies gaps that currently exist and the work that must be completed to develop a complete validated structured process required to deploy the technologies for integrity assessment of difficult to inspect pipelines. The research also aims to compare predictions of remaining life using statistical approaches applied to the partial inspection data with remaining life obtained from conventional integrity assessment using ILI or hydrostatic test.

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Bettin, Giorgia, David Lord e David Keith Rudeen. SPR Hydrostatic Column Model Verification and Validation. Office of Scientific and Technical Information (OSTI), ottobre 2015. http://dx.doi.org/10.2172/1235644.

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