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Journal articles on the topic 'Thermal field modeling'

Author: Grafiati

Published: 30 May 2022

Last updated: 31 May 2022

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1

Liu, Xue-Ming, Han-Yi Zhang, Yi-Li Guo, Xiao-Ping Zheng, and Yan-He Li. "Modeling of Thermal/Electric-Field Poling." Japanese Journal of Applied Physics 40, Part 2, No. 8A (August 1, 2001): L807—L809. http://dx.doi.org/10.1143/jjap.40.l807.

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2

Yushchenko, N. L. "CURRENT STATE OF DEVELOPMENT IN THE FIELD OF ECONOMIC AND MATHEMATICAL MODELING OF THERMAL POWER." SCIENTIFIC BULLETIN OF POLISSIA 2, no. 1(9) (2017): 24–31. http://dx.doi.org/10.25140/2410-9576-2017-2-1(9)-24-31.

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3

Jaffe, T. R. "Multiwavelength Magnetic Field Modeling." Proceedings of the International Astronomical Union 10, H16 (August 2012): 401. http://dx.doi.org/10.1017/s1743921314011703.

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AbstractWe model the large-scale Galactic magnetic fields, including a spiral arm compression to generate anisotropic turbulence, by comparing polarized synchrotron and thermal dust emission. Preliminary results show that in the outer Galaxy, the dust emission comes from regions where the fields are more ordered than average while the situation is reversed in the inner Galaxy. We will attempt in subsequent work to present a more complete picture of what the comparison of these observables tells us about the distribution of the components of the magnetized ISM and about the physics of spiral arm shocks and turbulence.

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4

Huang, Guang Yu, and Cher Ming Tan. "Device level electrical-thermal-stress coupled-field modeling." Microelectronics Reliability 46, no. 9-11 (September 2006): 1823–27. http://dx.doi.org/10.1016/j.microrel.2006.07.076.

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5

Ancona, M. G. "Modeling of thermal effects in silicon field emitters." Journal of Vacuum Science & Technology B: Microelectronics and Nanometer Structures 14, no. 3 (May 1996): 1918. http://dx.doi.org/10.1116/1.588955.

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6

Litvinov, D. O., O. O. Shlyanin, Т. V. Bondarchuk, O. V. Stremydlovska, and Riham Matar. "SCHEME-FIELD MODELING OF THERMAL PROCESSES IN INDUCTION MOTORS." Electrical Engineering and Power Engineering, no. 1 (July 14, 2017): 71–78. http://dx.doi.org/10.15588/1607-6761-2017-1-9.

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7

Gilbert, K. M., W. B. Handler, and B. A. Chronik. "Thermal modeling of resistive magnets for field-cycled MRI." Concepts in Magnetic Resonance Part B: Magnetic Resonance Engineering 26B, no. 1 (2005): 56–66. http://dx.doi.org/10.1002/cmr.b.20035.

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8

Tarnawski, V. R., T. Momose, M. L. McCombie, and W. H. Leong. "Canadian Field Soils III. Thermal-Conductivity Data and Modeling." International Journal of Thermophysics 36, no. 1 (December 18, 2014): 119–56. http://dx.doi.org/10.1007/s10765-014-1793-z.

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9

Herreinstein, A. V., E. A. Herreinstein, and N. Mashrabov. "Modeling a Rotating Circle Thermal Field with a Thermal Source on the Edge." Procedia Engineering 129 (2015): 317–20. http://dx.doi.org/10.1016/j.proeng.2015.12.068.

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10

Lu, Dawei, Ananda Das, and Wounjhang Park. "Direct modeling of near field thermal radiation in a metamaterial." Optics Express 25, no. 11 (May 26, 2017): 12999. http://dx.doi.org/10.1364/oe.25.012999.

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11

Swift, G., T. S. Molinski, R. Bray, and R. Menzies. "A fundamental approach to transformer thermal modeling. II. Field verification." IEEE Transactions on Power Delivery 16, no. 2 (April 2001): 176–80. http://dx.doi.org/10.1109/61.915479.

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12

Kiryukhin, Alexey, Tianfu Xu, Karsten Pruess, John Apps, and Igor Slovtsov. "Thermal–hydrodynamic–chemical (THC) modeling based on geothermal field data." Geothermics 33, no. 3 (June 2004): 349–81. http://dx.doi.org/10.1016/j.geothermics.2003.09.005.

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13

Jedrasiak, P., H. R. Shercliff, Y. C. Chen, L. Wang, P. Prangnell, and J. Robson. "Modeling of the Thermal Field in Dissimilar Alloy Ultrasonic Welding." Journal of Materials Engineering and Performance 24, no. 2 (December 10, 2014): 799–807. http://dx.doi.org/10.1007/s11665-014-1342-8.

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14

Barański, Mariusz, and Krystian Glapa. "3D thermal field modelling in electromagnetic gripping system." ITM Web of Conferences 28 (2019): 01012. http://dx.doi.org/10.1051/itmconf/20192801012.

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In this paper, 3D steady-state thermal field modeling in electromagnetic gripping system using Comsol Multiphisics was presented. The electromagnetic gripping system, which is a component of the mechanical leg of a walking robot was designed by the authors. An algorithm to design of the electromagnetic gripping was developed. During calculations, the influence of the value of the current on the thermal field distribution in steady-state was carried out. Selected results of simulations as well as the analysis of these results were presented.

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15

Sfetsos, H., J. Angelis, and C. Doumanidis. "Scanned Orbital Welding: Thermal Modeling and Lumped Adaptive Control." Journal of Pressure Vessel Technology 121, no. 4 (November 1, 1999): 393–99. http://dx.doi.org/10.1115/1.2883721.

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Scan orbital welding of cylindrical vessel, flange, and piping parts is performed by their rapid revolution under a radially or axially translated heat source, with its power modulated so as to implement a specified thermal distribution. Thus, the plasma-arc welding torch sweeps the stainless steel surface to generate a desirable temperature field and the concomitant material features. A numerical simulation of the thermal field is developed for off-line analysis. On this basis, a lumped thermal regulator of the heat-affected zone, employing infrared temperature feedback at a single spot, as well as standard PI, gain scheduling, and self-tuning control algorithms is tested. The thermal model is also employed for real-time torch efficiency identification and compensation. The numerical reference model serves as the basis for an in-process adaptive thermal control system to regulate the temperature field, using thermal feedback from the infrared pyrometer. A distributed-parameter control strategy, with guidance of the torch motion and power by a new weighted attraction strategy to randomly sampled points, is tested on scan-welded flanges. The regulator is validated computationally and experimentally, and its applicability to other scanned processing of materials is considered.

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16

Liu, Hong, Jin Guo Li, and Yong Tian Wang. "Fast Computing Model for Thermal Field of Auto Lamp." Key Engineering Materials 364-366 (December 2007): 783–88. http://dx.doi.org/10.4028/www.scientific.net/kem.364-366.783.

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Thermal field analysis for automotive lamps is a complicated thermodynamics problem. According to the features of structure and lighting process of automotive lamps, a simple and convenient model is put forward here for analyzing their thermal field. Under certain assumptions, it simplifies the complicated geometrical structure to the relative simple cavities and only considers the influence of thermal conduction and thermal radiation as main forms of heat transfer for thermal field of the lamps. The consistency of numerical analysis and actual test demonstrates that this modeling method calculates thermal field of the lamps quickly and perfectly, and indicates its practical signification.

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17

Popa, Ioan, and Alin-Iulian Dolan. "Numerical modeling of DC busbar contacts." Facta universitatis - series: Electronics and Energetics 24, no. 2 (2011): 209–19. http://dx.doi.org/10.2298/fuee1102209p.

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The paper presents two electro-thermal numerical models which can be used for the modeling and optimization of high currents busbar contacts for DC. The models are obtained by coupling of the electric model with the thermal field problem. The coupling is carried out by the source term of the differential equation which describes the thermal field. The models allows the calculation of the space distribution of the electric quantities (electric potential, the gradient of potential and the current density) and of the thermal quantities (the temperature, the temperature gradient, the Joule losses and heat flow). A heating larger than that of the busbar appears in the contact zone, caused by the contact resistance. The additional heating, caused by the contact resistance is simulated by an additional source injected on the surface of contact. The 2D model has been solved by the finite volumes method while the 3D model, by the finite elements method. Both models were experimentally validated. Using the models, one can determine the optimal geometry of dismountable contact for an imposed limit value of the temperature.

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18

Rahadian, Erwin Yuniar, and Agung Prabowo Sulistiawan. "The Evaluation of Thermal Comfort using a BIM-based Thermal Bridge Simulation." Journal of Architectural Research and Education 1, no. 2 (January 1, 2020): 129. http://dx.doi.org/10.17509/jare.v1i2.22304.

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Global warming has become an important issue today, caused by the increasing demand for energy and humans lifestyle. To reduce the impact, more architects started to respond regarding environmental issues. The concept of green architecture promotes to solving this problem. Natural ventilation is the one of the concept green architecture. This research tends to look at the aspect of Thermal Comfort in naturally ventilated mosque buildings through the Thermal Bridges strategy. Naturally ventilated building tend to have better indoor air quality (IAQ), but worse thermal comfort. Therefore, this research investigates the range of acceptable temperature and calculate by BIM thermal bridge simulation to achieve thermal comfort for naturally ventilated mosque building. The method of analysis conducted is quantitative based on direct measurement of weather data and existing comfort conditions in the field, calculations, and simulations using Building Information Modeling (BIM). Data was collected through a field survey in Itenas Mosque Building and were used to develop and validate then using the BIM thermal bridge model for simulation. The data collected from field survey and in situ environmental measurement such as air temperature, relative humidity, and wind velocity. The thermal comfort prediction model was developed from statistical analysis of the field survey data. Based on the result of thermal Bridge simulation using BIM software required exchange material of the existing building to achieve thermal comfort. Keyword-Thermal comfort, Building Information Modelling, Thermal Bridge Simulation

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19

Zhao, Feifei. "Modeling and Thermal-Mechanical Coupling Analysis of Piston in Car Engines." Annales de Chimie - Science des Matériaux 45, no. 1 (February 28, 2021): 83–92. http://dx.doi.org/10.18280/acsm.450111.

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In this paper, finite-element analysis (FEA) is carried out on the temperature field and stress field of automobile engine piston, as well as the thermal-mechanical load coupling stress field. Through the analysis, the authors grasped the thermal load and combined stress distribution of the piston, and thus optimized the piston design to improve its operational reliability. Specifically, a 1/4 solid model of the piston was constructed in the three-dimensional (3D) computer-aided design (CAD) software Pro/ENGINEER, and then converted into a finite-element model in Pro/Mechanica. Then, an alternating load was imposed on the piston model, and fatigue analysis was performed to identify the parts of the piston prone to fatigue failure, and judge whether the piston structure satisfies working requirements. Next, temperature field analysis was carried out on the piston model. The distribution of the steady-state temperature field as determined by applying temperatures and heat transfer coefficients as required by the boundary conditions of the third kind. Finally, the piston model was subject to thermal-mechanical coupling analysis. The stress and deformation distributions of the piston under the coupled stress field were ascertained under the boundary conditions of temperature field distribution and mechanical load. Through the above work, the authors obtained the basis for safety evaluation of piston, laying the foundation for further reducing the thermal load and optimizing the stress distribution of piston.

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20

Han, Jian, Li Ping Wang, and Lian Qing Yu. "Modeling and Estimating Thermal Error in Precision Machine Spindles." Applied Mechanics and Materials 34-35 (October 2010): 507–11. http://dx.doi.org/10.4028/www.scientific.net/amm.34-35.507.

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Thermal induced errors are significant factors that affect machine tool accuracy. The deformation of spindle is the main contributor to thermal error. In this paper, the thermal characteristics of the spindle system are investigated. Taking into account the coupling of elastic deformation and temperature, the heat conduction of the spindle system is modeled. The heat of bearings and heat transfer coefficient, and boundary conditions of the spindle are determined. Based on the numerical results, an iterative model of spindle's temperature and thermal deformation are acquired under the actions of thermal loads using the finite element method. Taking the spindle of precision boring machine with some reasonable assumptions and simplicities as an example, the finite element analysis model of spindle thermal characteristics is analyzed with virtual prototyping, and the static/transient temperature field and thermal-structure field are calculated using ABAQUS software. The characteristics of heat flow and thermal deformation within the spindle are analyzed according to the simulation results. The research results provide a theoretical foundation for reasonable arrangement and optimal design to reduce radial and axial deformation of the spindle head, temperature controlling, and the error compensation to the precision machining tool.

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21

Efremov, A. N., V. A. Khokhlov, S. V. Isupov, and Yu P. Zaikov. "ELECTRIC AND THERMAL FIELD MODELING IN ELECTROLYZER WITH LIQUID METAL ELECTRODES." Izvestiya Vuzov Tsvetnaya Metallurgiya (Proceedings of Higher Schools Nonferrous Metallurgy, no. 6 (January 1, 2016): 14–20. http://dx.doi.org/10.17073/0021-3438-2016-6-14-20.

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22

Jiang, Shou Zhong, Zhi Yi Wang, and Jian Jun Li. "Modeling & Field Test of Dwelling with Courtyard Summer Thermal Environment." Applied Mechanics and Materials 193-194 (August 2012): 1061–64. http://dx.doi.org/10.4028/www.scientific.net/amm.193-194.1061.

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Chinese historical experience of constructing buildings merits attention. As the main and typical kind of Chinese traditional residential building, the dwelling with courtyard is “cool in summer”. However, less research on the thermal performance of dwelling with courtyard has been available in public literature. In this paper, based on the systematic analysis on various related elements, the physical and mathematical model of the air temperature distribution is set up. It is proved by the fieldwork measurement and computer simulation that the shielding effect of the aisle, side house and the long-narrow structure are the main reasons for the low temperature in courtyard.

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23

Almukhametova, E. M. "Recommendations on thermal non-stationary waterflooding when modeling oil field development." IOP Conference Series: Earth and Environmental Science 194 (November 15, 2018): 062002. http://dx.doi.org/10.1088/1755-1315/194/6/062002.

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24

Bayer, U., M. Scheck, and M. Koehler. "Modeling of the 3D thermal field in the northeast German basin." Geologische Rundschau 86, no. 2 (August 28, 1997): 241–51. http://dx.doi.org/10.1007/s005310050137.

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25

Cui, Shiyu, Qiang Miao, Joseph P. Domblesky, Wenping Liang, and Youpeng Song. "Modeling of the temperature field in a porous thermal barrier coating." Ceramics International 45, no. 10 (July 2019): 12635–42. http://dx.doi.org/10.1016/j.ceramint.2019.02.166.

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26

Drahoš, Peter, Vladimír Kutiš, and Róbert Lenický. "Thermocouple Sensor Influence on Temperature Field in SMA Actuator." Applied Mechanics and Materials 394 (September 2013): 50–56. http://dx.doi.org/10.4028/www.scientific.net/amm.394.50.

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The paper deals with thermal analysis, modeling and simulation of the Shape Memory Alloy (SMA) actuator with temperature sensor. Because the capabilities of analytical description of SMA system are limited, numerical simulations of model have to be performed. Two different numerical models are investigated - lumped and continuous model. Simple parametric lumped model of actuator thermal field is developed in order to describe thermal field at the measuring point. The characteristic parameters of the lumped model are set up according to continuous coupled electric-thermal model made in ANSYS FEM program.

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27

Yakovlev, O. Ya, and D. V. Malygin. "External thermal modeling satellite platform «Synergy»." Spacecrafts & Technologies 3, no. 3 (2019): 155–63. http://dx.doi.org/10.26732/2618-7957-2019-3-155-163.

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In order to conduct thermal research of the satellite platform «Synergy», a mathematical model has been developed for calculating external thermal loads for spacecraft of the CubeSat form factor, operating in various orientation modes in near-Earth circular orbits. When modeling thermal conditions, heat fluxes from the Sun, the earth's flux and atmospheric effects are taken into account. A feature of the model is the transition to a moving geocentric coordinate system for determining the density of heat fluxes of direct and reflected solar radiation. The study of thermal conditions in the process of orbital motion is carried out and the parameters of the position of the orbital plane and the parameters of the Sun are determined at which the maximum and minimum average integral thermal loads are achieved during the orbital period. In these orbits, the motion of the satellite platform was simulated in three typical orientation modes and the density values of the absorbed heat fluxes by its external elements were determined. Four options for the design of the housing are being investigated. The data obtained during the simulation were used for the initial stationary calculation of the temperature field of the satellite platform in the ANSYS software package. The most interesting cases from the point of view of the thermal regime for further thermal research have been identified.

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28

Gao, Tian Hong. "Modeling of Diesel Engine Piston and Finite Element Mesh." Advanced Materials Research 971-973 (June 2014): 581–83. http://dx.doi.org/10.4028/www.scientific.net/amr.971-973.581.

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according to the heat load of diesel engine piston, to set up the finite element model and the corresponding thermal boundary conditions of 3D thermal models of the diesel engine piston, Through the finite element analysis , simulating the temperature field. Through the above finite element analysis,getting the temperature field of diesel engine piston, to build a theoretical basis for the development and design of other diesel engine piston.

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29

Wang, Zi Jun, Zhao Xuan Zhu, and Yu Hong Ma. "Thermal Security Analysis of Lithium-Ion Batteries Based on Electro-Thermal Modeling." Advanced Materials Research 724-725 (August 2013): 804–7. http://dx.doi.org/10.4028/www.scientific.net/amr.724-725.804.

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The power lithium-ion battery with its high specific energy, high theoretical capacity and good cycle-life is a prime candidate as a power source for electric vehicles (EVs) and hybrid electric vehicles (HEVs). Sacurity is especially important for large-scale lithium-ion batteries, especially the thermal analysis is essential for their development and design. Mathematical model and thermal model for Li-ion battery were built to analyze the effects of discharge rate on the peak temperature and on the homogeneity of temperature field, and to compare the calculated and the simulated results.

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30

Ji, Liang Bo, and Tian Rui Zhou. "Finite Element Simulation of Temperature Field in Fused Deposition Modeling." Advanced Materials Research 97-101 (March 2010): 2585–88. http://dx.doi.org/10.4028/www.scientific.net/amr.97-101.2585.

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Taking into account temperature-dependent thermal conduction and heat capacity, based in the research on the physical property of the material of Acrylonitrile Butadiene Styrene (ABS), a three-dimensional transient thermal finite element model has been developed in Fused Deposition Modeling (FDM). The moving material of ABS by the sprayer on the mold equipment is simulated with the employment of ANSYS parametric design language (APDL) and latent heat is considered by using enthalpy. By the technique of element live and die on ANSYS software and using the nonlinear finite element method, several conclusions according to the simulation results were produced, first of all, the simulation result shows that the temperature field distribution likes an ellipse; secondly, comparing with the previous track, the latter one has larger heat affected region and larger inhomogeneous temperature distribution; the greatest temperature gradient takes place near the edges of deposited part where the sprayer scanning direction changes.

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31

Zhao, Yan Jun, Xin Jun Li, Yong Hai Wu, and Cheng Xu. "Thermal Response Analysis and FE Modeling of Weapon." Advanced Materials Research 503-504 (April 2012): 11–14. http://dx.doi.org/10.4028/www.scientific.net/amr.503-504.11.

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Thermal is a important factor that affect weapon firing accuracy and security in the process of weapon fire, so thermal analysis of weapon has important meaning . Aim at researched Weapon, the finite element model of the gun body was built, the temperature field of the gun body was calculated by FEM. The effects of temperature of the gun body on firer and aiming mechanism were also studied. Current research work will be helpful the weapon design

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32

Radu, Bogdan, Cosmin Codrean, Radu Cojocaru, and Cristian Ciucă. "Numerical Modeling of Thermal Field Distribution during Friction Stir Welding (FSW) of Dissimilar Materials." Solid State Phenomena 254 (August 2016): 261–66. http://dx.doi.org/10.4028/www.scientific.net/ssp.254.261.

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Friction Stir Welding (FSW) is an innovative solid state welding process, relatively new in industry, which allow welding of two or more materials which have very different properties, particularly thermal properties as fusion temperature, thermal expansion coefficient, specific heat and thermal conduction and have a predisposition to form intermetallic brittle phases, neither one of the components to be weld reach to the melting point. Being a solid state welding process temperature field is very important for the quality of the welded joint, and a lot of researches focused on this topic. This paper presents some results in modeling and estimation of thermal field developed during FSW of dissimilar joints, using Finite Element Analysis. Numerical modeling of thermal field allows engineers to predict, in advance, the evolution of temperature and to estimate the behavior of the welded materials during the welding process. This will reduce significantly the time and number of experiments that have to be carried out, in the process of establishing a good FSW technology, as well as reducing significantly the cost of the tests.

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33

Korizis, G., and C. Doumanidis. "Scan Welding: Thermal Modeling and Control of Material Processing." Journal of Manufacturing Science and Engineering 121, no. 3 (August 1, 1999): 417–24. http://dx.doi.org/10.1115/1.2832697.

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This article provides a thermal analysis of scan welding, as a redesign of classical joining methods, employing computer technology to ensure the composite morphologic, material and mechanical integrity of the joint. This is obtained by real-time control of the welding temperature field by a proper dynamic heat input distribution on the weld surface. This distribution is implemented in scan welding by a single torch, sweeping the joint surface by a controlled reciprocating motion, and power adjusted by feedback of infrared temperature measurements in-process. An off-line numerical simulation of the thermal field in scan welding is established, as well as a linearized multivariable model with real-time parameter identification. An adaptive thermal control scheme is thus implemented and validated both computationally and experimentally on a robotic Gas-Tungsten Arc Welding setup. The resulting productivity and quality features of scan welding are comparatively analyzed in terms of material structure and properties of the joint.

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34

Scott, G. C., and G. Astfalk. "Modeling Thermal Stress Behavior in Microelectronic Components." Journal of Electronic Packaging 112, no. 1 (March 1, 1990): 35–40. http://dx.doi.org/10.1115/1.2904338.

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Thermal stress cracking is a significant mechanical failure mode in microelectronic components. This failure results from elevated stresses in components exposed to elevated temperatures due to the mismatch of thermal and mechanical properties of the constituent materials. The underlying mechanism responsible for these elevated stresses is not well understood. Therefore, we developed general mathematical and computational techniques for modeling the evolution of these stresses. As a test vehicle, we applied these techniques to thermal stress evolution in multilayer ceramic capacitors (MLCC). Thermal stress cracking has been implicated in significant, industry-wide problems associated with the cracking of these components. The model is used to solve for the transient development of thermal and mechanical gradients across the two spatial dimensions of the MLCC mid-plane. Material types with different thermal and mechanical properties and the interfaces between the material types are specifically included in the model. The stress field solutions are used to indicate when and where mechanical failure is expected to occur. The solutions of the model equations have been obtained using special partial differential equation solvers implemented on a CONVEX C120/220 supercomputer. The model is used to investigate the effects of MLCC termination geometry and material properties on the evolution of thermal stresses.

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35

Liu, De Ping, Jie Li, Yu Feng Su, and Yu Ping Wang. "Temperature Field Modeling and Thermal Deformation Analysis of Turning and Milling Machining Center." Advanced Materials Research 189-193 (February 2011): 1986–90. http://dx.doi.org/10.4028/www.scientific.net/amr.189-193.1986.

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Taking the high-speed CX series vertical milling compound machining center of CX8075 produced by Anyang Xinsheng Machine Tool Co., Ltd. as example, the machine three-dimensional simplified model is established, the source of the heat and the distribution of the important hot-points are analyzed, the machine temperature field distribution is derived which lays a foundation for the thermal error compensation. Taking into account the moving part-saddle of the machining center, its mathematic model is obtained, the important hot-points are studied, the thermodynamic parameters are determined. Based on ANSYS finite element method, the steady-state temperature field and the thermal deformation of saddle are presented, the optimal design of high-speed and high-accuracy machine tool is doned and its thermal deformation analysis is realized.

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36

Kwak, Taejin, and Dongchoul Kim. "Controlling Equilibrium Morphologies of Bimetallic Nanostructures Using Thermal Dewetting via Phase-Field Modeling." Materials 14, no. 21 (November 7, 2021): 6697. http://dx.doi.org/10.3390/ma14216697.

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Herein, we report a computational model for the morphological evolution of bimetallic nanostructures in a thermal dewetting process, with a phase-field framework and superior optical, physical, and chemical properties compared to those of conventional nanostructures. The quantitative analysis of the simulation results revealed nano-cap, nano-ring, and nano-island equilibrium morphologies of the deposited material in thermal dewetting, and the morphologies depended on the gap between the spherical patterns on the substrate, size of the substrate, and deposition thickness. We studied the variations in the equilibrium morphologies of the nanostructures with the changes in the shape of the substrate pattern and the thickness of the deposited material. The method described herein can be used to control the properties of bimetallic nanostructures by altering their equilibrium morphologies using thermal dewetting.

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37

Jia, Meixia, Jianjun Hu, Feng Xiao, Ying Yang, and Chenghao Deng. "Modeling and Analysis of Electromagnetic Field and Temperature Field of Permanent-Magnet Synchronous Motor for Automobiles." Electronics 10, no. 17 (September 6, 2021): 2173. http://dx.doi.org/10.3390/electronics10172173.

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In order to study the interaction of electromagnetic fields and temperature fields in a motor, the iron loss curve at different frequencies of silicon steel and the B-H curve at different temperatures of the permanent magnet (PM) were obtained to establish the electromagnetic model of the permanent magnet synchronous motor (PMSM). Then, unidirectional and bidirectional coupling models were established and analyzed based on the multi-physical field. By establishing a bidirectional coupling model, the temperature field distribution and electromagnetic characteristics of the motor were analyzed. The interaction between temperature and electromagnetic field was studied. Finally, the temperature of the PMSM was tested. The results showed that the bidirectional coupling results were closer to the test result because of the consideration of the interaction between electromagnetic and thermal fields.

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38

Barglik, Jerzy. "Mathematical modeling of induction surface hardening." COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering 35, no. 4 (July 4, 2016): 1403–17. http://dx.doi.org/10.1108/compel-09-2015-0323.

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Purpose – As far as the author knows the modeling of induction surface hardening is still a challenge. The purpose of this paper is to present both mathematical models of continuous and simultaneous hardening processes and exemplary results of computations and measurements. The upper critical temperature Ac3 is determined from the Time Temperature Austenization diagram for investigated steel. Design/methodology/approach – Computation of coupled electromagnetic, thermal and hardness fields is based on the finite element methods, while the hardness distribution is determined by means of experimental dependence derived from the continuous cooling temperature diagram for investigated steel. Findings – The presented results may be used as a theoretical background for design of inductor-sprayer systems in continual and simultaneous arrangements and a proper selection of their electromagnetic and thermal parameters. Research limitations/implications – The both models reached a quite good accuracy validated by the experiments. Next work in the field should be aimed at further improvement of numerical models in order to shorten the computation time. Practical implications – The results may be used for designing induction hardening systems and proper selection of field current and cooling parameters. Originality/value – Complete mathematical and numerical models for continuous and simultaneous surface induction hardening including dual frequency induction heating of gear wheels. Experimental validation of achieved results. Taking into account dependence of the upper critical temperature Ac3 on speed of heating.

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Zyablov, Dmitiy Vyacheslavovich, Sergey Valeryevich Bespalko, and Alexander Vyacheslavovich Zyablov. "Modeling of non-steady thermal field of shell for oil and gasoline tank at fire." Transport of the Urals, no. 1 (2022): 15–18. http://dx.doi.org/10.20291/1815-9400-2022-1-15-18.

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Emergency states that arise at influence of free fire on an oil and gasoline tank shell lead to thermal stress that can cause shell damage, a decrease of hardness and material strength. The paper considers a method for determination of a non-steady thermal field of the shell in a fire centre. Besides, the authors have got a thermal conductivity equation in partial derivatives and suggest a new approximation of the thermal field in the form of polynomials. The method is realized in the MathCad program complex and can be used at design of railway tanks for transportation of dangerous freights and at development of systems for protection from emergency thermal influences.

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Park, Chan Hyeong, and In-Young Chung. "Modeling of Electrolyte Thermal Noise in Electrolyte-Oxide-Semiconductor Field-Effect Transistors." JSTS:Journal of Semiconductor Technology and Science 16, no. 1 (February 28, 2016): 106–11. http://dx.doi.org/10.5573/jsts.2016.16.1.106.

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Wang, Di, Kaibo Liu, and Xi Zhang. "Spatiotemporal Thermal Field Modeling Using Partial Differential Equations With Time-Varying Parameters." IEEE Transactions on Automation Science and Engineering 17, no. 2 (April 2020): 646–57. http://dx.doi.org/10.1109/tase.2019.2940269.

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Yuan, Chao, Yuewei Zhang, Robert Montgomery, Samuel Kim, Jingjing Shi, Akhil Mauze, Takeki Itoh, James S. Speck, and Samuel Graham. "Modeling and analysis for thermal management in gallium oxide field-effect transistors." Journal of Applied Physics 127, no. 15 (April 21, 2020): 154502. http://dx.doi.org/10.1063/1.5141332.

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Zhu, Ming-Xiao, Heng-Gao Song, Jia-Cai Li, Qiu-Cheng Yu, and Ji-Ming Chen. "Phase-field modeling of electric-thermal breakdown in polymers under alternating voltage." IEEE Transactions on Dielectrics and Electrical Insulation 27, no. 4 (August 2020): 1128–35. http://dx.doi.org/10.1109/tdei.2020.008717.

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Abubakar, Abba Abdulhamid, Syed Sohail Akhtar, and Abul Fazal M. Arif. "Phase field modeling of V2O5 hot corrosion kinetics in thermal barrier coatings." Computational Materials Science 99 (March 2015): 105–16. http://dx.doi.org/10.1016/j.commatsci.2014.12.004.

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Fourligkas, N., and C. Doumanidis. "Temperature Field Regulation in Thermal Cutting for Layered Manufacturing." Journal of Manufacturing Science and Engineering 121, no. 3 (August 1, 1999): 440–47. http://dx.doi.org/10.1115/1.2832701.

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A general thermal modeling and control methodology for thermal processing of layered materials for rapid prototyping technologies is established in this article. An analytical multivariable model of lumped temperature outputs generated by heat inputs on a surface grid is developed, based on Green’s function and state-space descriptions. The few independent parameters needed in such a linearized formulation are experimentally identified, and their time-variability reflects the heat transfer nonlinearities and process disturbances. A robust controller with thermal feedback is designed by pole placement methods, to obtain a specified dynamic temperature field yielding the desired material structure and properties. The regulated thermal processing is optimized in real time by proper heat source power modulation and torch guidance through a simulated annealing strategy. Its performance is tested on both the computer model and a laboratory station, using robotically guided plasma-arc cutting and infrared thermal sensing, in regulating the sensitized zone during blanking of an elementary contour pattern on stainless steel.

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Hu, Tao, Yan Li, Duo Su, and Hai Xia Lv. "Thermal Modeling Solid-Liquid Phase Change Materials (PCMs)." Advanced Materials Research 746 (August 2013): 161–66. http://dx.doi.org/10.4028/www.scientific.net/amr.746.161.

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Three thermal modeling methods for phase change materials (PCMs): enthalpy-based method, effective heat capacity method and apparent heat capacity method, are presented in details. Their characteristics and application limitations are compared and discussed. We found that enthalpy-based method and effective heat capacity method are both approximation treatments, and can be well used in steady state problems, while apparent heat capacity method tracks the moving phase change boundary in PCMs, and it is the most accurate and applicable method of the three for dealing with transient processes. This work might provide useful information for the study of using PCMs in temperature control field, especially in aircraft environmental temperature control and thermal management.

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Carrillo-Heian, E. M., O. A. Graeve, A. Feng, J. A. Faghih, and Z. A. Munir. "Modeling studies of the effect of thermal and electrical conductivities and relative density of field-activated self-propagating combustion synthesis." Journal of Materials Research 14, no. 5 (May 1999): 1949–58. http://dx.doi.org/10.1557/jmr.1999.0263.

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The role of the electrical conductivity of the product and of the thermal conductivities of the reactants on self-propagating combustion synthesis was investigated through modeling studies. Similar studies were made to investigate the role of the relative density of the reactants. The effect of an imposed electric field on the results of the modeling analysis was considered. For any given imposed field, the wave velocity exhibited a maximum at a given normalized thermal conductivity, electrical conductivity, and relative density. The results are discussed in terms of the Joule heat contribution of the field and are compared with experimental observations.

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Mao, Jian, Hong Juan Hou, Ji Feng Song, and Song Gao. "Modeling and Thermal Performance Analysis of Parabolic trough Solar Field with Single-Axis Tracked." Advanced Materials Research 512-515 (May 2012): 101–8. http://dx.doi.org/10.4028/www.scientific.net/amr.512-515.101.

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In this paper, a model of parabolic trough solar field with single-axis tracked was developed based on detailed mathematical derivation. A software tool is also developed for its performance calculation. By the model and software, the direct solar irradiation (DNI) intercepted by the collectors and the thermal output can be obtained for a given solar field under different tracking mode. To obtain the characters of the solar field performance with different tracking modes and regions, the annual performance of the solar field is evaluated for different sites in China such as Beijing, Lhasa. Besides that, the effect of the space between collector rows on thermal output of a solar field is also discussed.

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Popov, Yury, Mikhail Spasennykh, Anuar Shakirov, Evgeny Chekhonin, Raisa Romushkevich, Egor Savelev, Anastasia Gabova, et al. "Advanced Determination of Heat Flow Density on an Example of a West Russian Oil Field." Geosciences 11, no. 8 (August 18, 2021): 346. http://dx.doi.org/10.3390/geosciences11080346.

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Reliable geothermal data are required for basin and petroleum system modeling. The essential shortcomings of the methods and results of previous geothermal investigations lead to a necessity to reappraise the data on the thermal properties and heat flow. A new, advanced experimental basis was used to provide reliable data on vertical variations in the thermal properties of formation and heat flow for the area surrounding a prospecting borehole drilled through an unconventional hydrocarbon reservoir of the Domanik Formation in the Orenburg region (Russia). Temperature logging was conducted 12.5 months after well drilling. The thermal properties of the rocks were measured with continuous thermal core profiling on all 1699 recovered core samples. Within non-cored intervals, the thermal conductivity of the rocks was determined from well-logging data. The influence of core aging, multiscale heterogeneity and anisotropy, in situ pressure and temperature on the thermal properties of rock was accounted for. The terrestrial heat flow was determined to be 72.6 ± 2.2 mW·m−2—~114% larger than the published average data for the studied area. The experiment presents the first experience of supporting basin modeling in unconventional plays with advanced experimental geothermal investigations.

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Chekhonin, Evgeny, Raisa Romushkevich, Evgeny Popov, Yury Popov, Alexander Goncharov, Konstantin Pchela, Maxim Bagryantsev, Alexey Terentiev, Ivan Kireev, and Sergey Demin. "Advanced Methods of Thermal Petrophysics as a Means to Reduce Uncertainties during Thermal EOR Modeling of Unconventional Reservoirs." Geosciences 11, no. 5 (May 7, 2021): 203. http://dx.doi.org/10.3390/geosciences11050203.

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Within the vast category of unconventional resources, heavy oils play an essential role as related resources are abundant throughout the world and the amount of oil produced using thermal methods is significant. Simulators for thermo–hydro–dynamic modeling, as a mandatory tool in oilfield development, are continuously improving. However, the present paper shows that software capabilities for the integration of data on the rock thermal properties necessary for modeling are limited, outdated in some aspects, and require revision. In this paper, it is demonstrated that a characteristic lack of reliable data on rock thermal properties also leads to significant errors in the parameters characterizing oil recovery efficiency. A set of advanced methods and equipment for obtaining reliable data on thermal properties is presented, and a new, vast set of experimental data on formation thermal properties obtained from the Karabikulovskoye heavy oil field (Russia) is described. The time-dependent results of modeling oil recovery at the field segment using the steam-assisted gravity drainage method with both published and new data are discussed. It is shown that the lack of experimental data leads to significant errors in the evaluation of the cumulative oil production (up to 20%) and the cumulative steam/oil ratio (up to 52%).

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