Journal articles: 'Numerical modelling of superconducting cables'

1

Bottura, L. "Modelling stability in superconducting cables." Physica C: Superconductivity 310, no. 1-4 (December 1998): 316–26. http://dx.doi.org/10.1016/s0921-4534(98)00482-1.

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Testoni, Pietro, Alessandro Bonito Oliva, Didier Comberscure, Sascha Hell, and Alfredo Portone. "Numerical Simulations of Superconducting Cables Bending and Winding." IEEE Transactions on Applied Superconductivity 20, no. 3 (June 2010): 1928–31. http://dx.doi.org/10.1109/tasc.2010.2040955.

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KOVACHEV, V. "AC LOSSES OF SUPERCONDUCTING ACCELERATOR MAGNETS." Modern Physics Letters B 17, no. 05n06 (March 10, 2003): 175–98. http://dx.doi.org/10.1142/s0217984903005093.

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We are focusing on the uncertainties of analytical and numerical analysis of AC losses in superconducting accelerator magnets working at a relatively high ramp rate. The loss experimental techniques are discussed as well as the source of error in the measurements. The correlation between the interstrand resistance of Rutherford cables and quench current behavior of superconducting magnets is addressed. The control of the critical current of full Rutherford cables by measuring the strands extracted from such cables is illustrated. The importance of cables curing temperature on microhardness and RRR of Cu-matrix of multifilamentary NbTi is pointed out.

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Hartmann, R., P. Rem, and L. Van de Klundert. "Numerical solutions of the current distribution in superconducting cables." IEEE Transactions on Magnetics 23, no. 2 (March 1987): 1584–87. http://dx.doi.org/10.1109/tmag.1987.1065018.

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Rochinha, F. A., and H. S. Costa Mattos. "Numerical modelling of the extension-torsion coupling in cables." Mechanics Research Communications 23, no. 5 (September 1996): 511–17. http://dx.doi.org/10.1016/0093-6413(96)00051-1.

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Hartmann, R. A., D. Dijkstra, F. P. H. van Beckum, and L. J. M. van de Klundert. "Numerical solution of the transverse resistivity of superconducting cables under AC conditions." IEEE Transactions on Magnetics 25, no. 2 (March 1989): 2131–34. http://dx.doi.org/10.1109/20.92730.

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Sheng, Jie, Michal Vojenciak, Rifki Terzioglu, Lubomir Frolek, and Fedor Gomory. "Numerical Study on Magnetization Characteristics of Superconducting Conductor on Round Core Cables." IEEE Transactions on Applied Superconductivity 27, no. 4 (June 2017): 1–5. http://dx.doi.org/10.1109/tasc.2016.2632901.

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Čiegis, Raimondas, Remigijus Čiegis, Mečislavas Meilūnas, Gerda Jankevičiutė, and Vadimas Starikovičius. "PARALLEL NUMERICAL ALGORITHMS FOR OPTIMIZATION OF ELECTRICAL CABLES." Mathematical Modelling and Analysis 13, no. 4 (December 31, 2008): 471–82. http://dx.doi.org/10.3846/1392-6292.2008.13.471-482.

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In this paper we propose new heuristic numerical algorithm for determination of the optimal wires diameters in electrical cables. Two multilevel parallel versions of the optimization algorithm are constructed. The first algorithm is based on master‐slave technique and the second algorithm uses the data‐parallel strategy. Multilevel structure of the algorithms gives a possibility to adapt them to parallel architecture, for example, cluster of multicore computers. Some results of numerical experiments are presented which agree well with theoretical analysis.

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TEBANO, RICCARDO, RENATA MELE, VINCENZO BOFFA, FEDOR GÖMÖRY, FRANTISEK STRYCEK, and EUGEN SEILER. "NUMERICAL INVESTIGATION ON AC PROPERTIES IN HIGH TC SUPERCONDUCTING TAPES." International Journal of Modern Physics B 17, no. 04n06 (March 10, 2003): 528–33. http://dx.doi.org/10.1142/s0217979203016182.

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Reduction of AC losses for large-scale applications of superconductors is a critical issue. Therefore, the quantitative evaluation of AC losses is important for the development of superconductors and their applications to electrical power systems. The development of numerical models that simulate the electromagnetic phenomena inside superconductors allows to understand the electromagnetic behavior of superconductors and to evaluate the AC loss properties. Following an approach proposed by Brandt in several papers, a numerical model was developed in order to study the AC properties of superconducting tapes in different geometrical arrangements and with time dependent current and magnetic field. Here we show an example for simple single-layer model cables to show how this rather simple and versatile numerical approach allows optimizing configurations for actual operational conditions.

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Qin, Jinggang, Donghua Yue, Xingyi Zhang, Yu Wu, Xiaochuan Liu, Huajun Liu, Huan Jin, et al. "Rotation analysis on large complex superconducting cables based on numerical modeling and experiments." Superconductor Science and Technology 31, no. 2 (December 19, 2017): 025001. http://dx.doi.org/10.1088/1361-6668/aa9c7b.

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Čiegis, Raimondas, Audrius Ilgevičius, Heinz Liess, Mečislavas Meilūnas, and Olga Suboč. "NUMERICAL SIMULATION OF THE HEAT CONDUCTION IN ELECTRICAL CABLES." Mathematical Modelling and Analysis 12, no. 4 (December 31, 2007): 425–39. http://dx.doi.org/10.3846/1392-6292.2007.12.425-439.

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The modelling of the heat conduction in electrical cables is a complex mathematical problem. To get a quantitative description of the thermo‐electrical characteristics in the electrical cables, one requires a mathematical model for it. It must involve the different physical phenomena occurring in the electrical cables, i.e. heat conduction, convection and radiation effects, description of heat sources due to current transitions. Since the space in mobile systems is limited and weight is always reduced, wire conductor sizes must be kept as small as possible. Thus the main aim is to determine optimal conductor cross‐sections for long standing loads. In this paper we develop and validate a set of mathematical models and numerical algorithms for the heat transfer simulation in cable bundles. The numerical algorithms are targeted to the two‐dimensional transient heat transfer mathematical models. Finally, a validation procedure for the coefficient validation of the differential equations is carried out. Results of numerical experiments are presented.

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12

Mitchell, N. "Modelling of non-uniform current diffusion coupled with thermohydraulic effects in superconducting cables." Cryogenics 40, no. 8-10 (August 2000): 637–53. http://dx.doi.org/10.1016/s0011-2275(01)00021-2.

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CHEN, HONGKUI, ZHAOHUA ZHANG, JILONG WANG, and QINGYU XU. "GLOBAL BIFURCATIONS AND CHAOTIC DYNAMICS IN SUSPENDED CABLES." International Journal of Bifurcation and Chaos 19, no. 11 (November 2009): 3753–76. http://dx.doi.org/10.1142/s0218127409025092.

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The global bifurcations and chaotic dynamics of parametrically and externally excited suspended cables are investigated in this paper. The governing equations are obtained to describe the nonlinear transverse vibrations of suspended cables. The Galerkin procedure is introduced to simplify the governing equations of motion to ordinary differential equations with two-degrees-of-freedom. The case of one-to-one internal resonance between the modes of suspended cables, primary and principal parametric resonance of suspended cables is considered. With the method of multiple scales, parametrically and externally excited system is transformed to the averaged equation, based on which, the recently developed global bifurcation method is employed to detect the presence of orbits which are homoclinic to certain invariant sets for the resonant case. The analysis of the global bifurcations indicates that there exist the generalized Šhilnikov type multipulse homoclinic orbits in the averaged equation of suspended cables. The results obtained here mean that chaotic motions can occur in suspended cables. Numerical simulations also verify the analytical predictions. It is found, according to the results of numerical simulations, that the Šhilnikov type multipulse homoclinic orbits exist in the nonlinear motion of the cables.

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Jiang, Zhenan, Naoyuki Amemiya, and Masaaki Nakahata. "Numerical calculation of AC losses in multi-layer superconducting cables composed of coated conductors." Superconductor Science and Technology 21, no. 2 (January 17, 2008): 025013. http://dx.doi.org/10.1088/0953-2048/21/2/025013.

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Kudryashov, N. A., and A. A. Kutukov. "Numerical modelling of doped graphane superconducting and normal properties." Journal of Physics: Conference Series 937 (December 2017): 012024. http://dx.doi.org/10.1088/1742-6596/937/1/012024.

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Bi, J. H., H. Y. Qiao, N. Nikitas, J. Guan, J. Wang, and P. Lu. "Numerical modelling for rain wind induced vibration of cables with longitudinal ribs." Journal of Wind Engineering and Industrial Aerodynamics 178 (July 2018): 69–79. http://dx.doi.org/10.1016/j.jweia.2018.05.002.

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17

Manil, Pierre, Francois Nunio, Yamen Othmani, Veronique Aubin, Jean-Yves Buffiere, Maria Soledad Commisso, Petr Dokladal, et al. "A Numerical Approach for the Mechanical Analysis of Superconducting Rutherford-Type Cables Using Bimetallic Description." IEEE Transactions on Applied Superconductivity 27, no. 4 (June 2017): 1–6. http://dx.doi.org/10.1109/tasc.2017.2664803.

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18

Ye, Haosheng, Wenrong Li, Boyang Shen, Rui Hu, Zhijian Jin, and Jie Sheng. "Numerical Study on Effect of Current Injection Methods on Terminal Resistance of Superconducting Compact Cables." IEEE Transactions on Applied Superconductivity 31, no. 5 (August 2021): 1–5. http://dx.doi.org/10.1109/tasc.2021.3071561.

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Čiegis, Raimondas, Gerda Jankevičiūtė, and Natalija Tumanov. "ON EFFICIENT NUMERICAL ALGORITHMS FOR SIMULATION OF HIGH POWER ELECTRICAL CABLES." Mathematical Modelling and Analysis 20, no. 6 (November 23, 2015): 701–14. http://dx.doi.org/10.3846/13926292.2015.1108250.

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The new virtual modelling tool is constructed, which is used for optimal design of power transmission lines and cables. The construction of such lines should meet the latest power transmission network technical and economical requirements. The solver is is based on classical and modified mathematical models describing main heat conduction processes: diffusion, convection and radiation in various materials and environments. In basic heat conduction equation, we take into account a linear dependence of the resistance on temperature. Multi-physic and multi-scale models are required to simulate industrial cases of power transmission lines. The velocity of convective transport of the heat in air regions is simulated by solving a coupled thermo-convection problem including the heat conduction problem and the standard Navier-Stokes model of the heat flow in air. Another multi-physic model is used to describe changes of material heat conduction coefficients in soil due to influence of heating. This process is described by by solving a simplified mass balance equation for flows in porous media. The multi-scale and homogenization analysis is required to to formulate simple and accurate mathematical describing heat conduction process is metal region which consists of a bundle of tightly coupled metal wires. The FVM is used to solve the obtained systems of differential equations. Discretization of the domain is done by applying “aCute” mesh generator, which is a modification of the well-known Triangle mesh generator. The discrete schemes are implemented by using the OpenFOAM tool.

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Benkraouda, M., H. Ghamlouche, M. I. Hussein, and T. M. Badarneh. "Numerical Modelling of High–Tc Superconducting Microstrip Line Using Fdtdtechnique." International Journal of Modelling and Simulation 30, no. 1 (January 2010): 67–72. http://dx.doi.org/10.1080/02286203.2010.11442559.

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21

Lindsay, K. A., J. R. Rosenberg, and G. Tucker. "Analytical and numerical construction of equivalent cables." Mathematical Biosciences 184, no. 2 (August 2003): 137–64. http://dx.doi.org/10.1016/s0025-5564(03)00059-2.

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22

Bugajev, Andrej, Gerda Jankevičiūtė, and Natalija Tumanova. "The Mathematical Modelling of Heat Transfer in Electrical Cables." Electrical, Control and Communication Engineering 5, no. 1 (May 1, 2014): 46–53. http://dx.doi.org/10.2478/ecce-2014-0007.

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Abstract This paper describes a mathematical modelling approach for heat transfer calculations in underground high voltage and middle voltage electrical power cables. First of the all typical layout of the cable in the sand or soil is described. Then numerical algorithms are targeted to the two-dimensional mathematical models of transient heat transfer. Finite Volume Method is suggested for calculations. Different strategies of nonorthogonality error elimination are considered. Acute triangles meshes were applied in two-dimensional domain to eliminate this error. Adaptive mesh is also tried. For calculations OpenFOAM open source software which uses Finite Volume Method is applied. To generate acute triangles meshes aCute library is used. The efficiency of the proposed approach is analyzed. The results show that the second order of convergence or close to that is achieved (in terms of sizes of finite volumes). Also it is shown that standard strategy, used by OpenFOAM is less efficient than the proposed approach. Finally it is concluded that for solving real problem a spatial adaptive mesh is essential and adaptive time steps also may be needed.

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23

Low, Chee Meng, Eddie Yin-Kwee Ng, Srikanth Narasimalu, Frank Lin, and Youngkook Kim. "Numerical modelling of seabed impact effects on chain and small diameter mooring cables." Applied Ocean Research 80 (November 2018): 248–77. http://dx.doi.org/10.1016/j.apor.2018.09.010.

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Wang, Yuefang, and Albert C. J. Luo. "Dynamics of traveling, inextensible cables." Communications in Nonlinear Science and Numerical Simulation 9, no. 5 (October 2004): 531–42. http://dx.doi.org/10.1016/s1007-5704(03)00002-9.

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25

Tsotsopoulou, Eleni, Adam Dyśko, Qiteng Hong, Abdelrahman Elwakeel, Mariam Elshiekh, Weijia Yuan, Campbell Booth, and Dimitrios Tzelepis. "Modelling and Fault Current Characterization of Superconducting Cable with High Temperature Superconducting Windings and Copper Stabilizer Layer." Energies 13, no. 24 (December 16, 2020): 6646. http://dx.doi.org/10.3390/en13246646.

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With the high penetration of Renewable Energy Sources (RES) in power systems, the short-circuit levels have changed, creating the requirement for altering or upgrading the existing switchgear and protection schemes. In addition, the continuous increase in power (accounting both for generation and demand) has imposed, in some cases, the need for the reinforcement of existing power system assets such as feeders, transformers, and other substation equipment. To overcome these challenges, the development of superconducting devices with fault current limiting capabilities in power system applications has been proposed as a promising solution. This paper presents a power system fault analysis exercise in networks integrating Superconducting Cables (SCs). This studies utilized a validated model of SCs with second generation High Temperature Superconducting tapes (2G HTS tapes) and a parallel-connected copper stabilizer layer. The performance of the SCs during fault conditions has been tested in networks integrating both synchronous and converter-connected generation. During fault conditions, the utilization of the stabilizer layer provides an alternative path for transient fault currents, and therefore reduces heat generation and assists with the protection of the cable. The effect of the quenching phenomenon and the fault current limitation is analyzed from the perspective of both steady state and transient fault analysis. This paper also provides meaningful insights into SCs, with respect to fault current limiting features, and presents the challenges associated with the impact of SCs on power systems protection.

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Eriksen, M., J. I. Bech, B. Seifi, and N. Bay. "3-dimensional numerical modelling of rolling of superconducting Ag/BSCCO tape." IEEE Transactions on Appiled Superconductivity 11, no. 1 (March 2001): 3756–59. http://dx.doi.org/10.1109/77.919881.

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Joseph, Jineeth, Shilpa Mohan, and Sindhu Thiruthi Krishnan. "Numerical modelling, simulation and experimental validation of partial discharge in cross-linked polyethylene cables." IET Science, Measurement & Technology 13, no. 2 (March 1, 2019): 309–17. http://dx.doi.org/10.1049/iet-smt.2018.5248.

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28

Amemiya, N., and M. Nakahata. "Numerical study on AC loss characteristics of superconducting power transmission cables comprising coated conductors with magnetic substrates." Physica C: Superconductivity and its Applications 463-465 (October 2007): 775–80. http://dx.doi.org/10.1016/j.physc.2007.04.265.

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Inada, R., Y. Nakamura, and A. Oota. "Numerical analysis for AC losses in single-layer cables composed of rectangular superconducting strips with various lateralJcdistributions." Journal of Physics: Conference Series 97 (February 1, 2008): 012324. http://dx.doi.org/10.1088/1742-6596/97/1/012324.

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Wang, X., A. Ishiyama, M. Ohya, O. Maruyama, and T. Ohkuma. "Numerical analyses of the electromagnetic force acting on high-temperature superconducting power cables due to fault current." Superconductor Science and Technology 25, no. 5 (April 23, 2012): 054018. http://dx.doi.org/10.1088/0953-2048/25/5/054018.

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31

He, Miao, Miao Hao, George Chen, Wenpeng Li, Chong Zhang, Xin Chen, Haitian Wang, Mingyu Zhou, and Xianzhang Lei. "Numerical study of influential factors on partial discharges in HVDC XLPE cables." COMPEL - The international journal for computation and mathematics in electrical and electronic engineering 37, no. 3 (May 8, 2018): 1110–17. http://dx.doi.org/10.1108/compel-08-2017-0323.

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Purpose For the dramatically developed high voltage direct current (HVDC) power transmission, HVDC cables play a vital role in the power transmission across seas and connections with renewable power sources. However, the condition monitoring of HVDC cables is still a challenging research topic. This paper aims to understand the influence of external factors, namely, current, cavity location and material properties, on partial discharge (PD) characteristics in HVDC cable in a numerical way referring to the refined Niemeyer’s model. Design/methodology/approach The influences of the three external factors are studied by a proposed numerical model for DC PDs based on the modification of a conventional PD model for AC voltage via a finite element analysis method. Findings The external factors can influence the discharge magnitude and discharge repetition rate via affecting the electrical conductivity of the material: DC PD is more frequent and with higher discharge magnitude when the cavity is closer to the conductor or the current through the conductor is higher. Both DC PD repetition rate and average discharge magnitude in long-term aged material are lower than virgin material. The effect of discharge on insulation degradation becomes decreasingly significant. Research limitations/implications The current work is based on the numerical modelling of DC PDs. Further experimental validations and comparisons are essential for improving the model. Practical implications The studies of the influence factors for PDs under HVDC voltage can benefit the research and practical power transmission on DC PDs, contributing the design and test of DC PDs in HVDC cables, exploring the understandings of the DC PDs’ mechanism. Originality/value This paper, to the best of author’s knowledge, first studies the influence factors on DC PDs based on the numerical modelling work.

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Araujo, H., and G. J. White. "Numerical modelling of the diffusion cooling response in superconducting hot-electron mixers." IEEE Transactions on Appiled Superconductivity 9, no. 2 (June 1999): 4229–32. http://dx.doi.org/10.1109/77.783958.

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Gömöry, F., and J. Sheng. "Two methods of AC loss calculation in numerical modelling of superconducting coils." Superconductor Science and Technology 30, no. 6 (May 11, 2017): 064005. http://dx.doi.org/10.1088/1361-6668/aa66af.

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34

Ainslie, Mark D., Chris W. Bumby, Zhenan Jiang, Ryuki Toyomoto, and Naoyuki Amemiya. "Numerical modelling of dynamic resistance in high-temperature superconducting coated-conductor wires." Superconductor Science and Technology 31, no. 7 (June 6, 2018): 074003. http://dx.doi.org/10.1088/1361-6668/aac1d3.

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Seo, K., M. Morita, K. Shimohata, and H. Yoshimura. "Numerical analyses for ramp rate limitation from the standpoint of heat generation during current redistribution [in superconducting cables]." IEEE Transactions on Appiled Superconductivity 9, no. 2 (June 1999): 591–95. http://dx.doi.org/10.1109/77.783365.

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Yu, P., and K. Pan. "Direct perturbation analysis on cables with concentrated loads." Communications in Nonlinear Science and Numerical Simulation 8, no. 2 (June 2003): 97–112. http://dx.doi.org/10.1016/s1007-5704(02)00083-7.

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Raoof, M., and I. Kraincanic. "Critical examination of various approaches used for analysing helical cables." Journal of Strain Analysis for Engineering Design 29, no. 1 (January 1, 1994): 43–55. http://dx.doi.org/10.1243/03093247v291043.

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Using theoretical parametric studies covering a wide range of cable (and wire) diameters and lay angles, the range of validity of various approaches used for analysing helical cables are critically examined. Numerical results strongly suggest that for multi-layered steel strands with small wire/cable diameter ratios, the bending and torsional stiffnesses of the individual wires may safely be ignored when calculating the 2 × 2 matrix for strand axial/torsional stiffnesses. However, such bending and torsional wire stiffnesses are shown to be first order parameters in analysing the overall axial and torsional stiffnesses of, say, seven wire stands, especially under free-fixed end conditions with respect to torsional movements. Interwire contact deformations are shown to be of great importance in evaluating the axial and torsional stiffnesses of large diameter multi-layered steel strands. Their importance diminishes as the number of wires associated with smaller diameter cables decreases. Using a modified version of a previously reported theoretical model for analysing multilayered instrumentation cables, the importance of allowing for the influence of contact deformations in compliant layers on cable overall characteristics such as axial or torsional stiffnesses is demonstrated by theoretical numerical results. In particular, non-Hertzian contact formulations are used to obtain the interlayer compliances in instrumentation cables in preference to a previously reported model employing Hertzian theory with its associated limitations.

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Jasman, Nur Azira, Nur Adlin Lina Normisyidi, Yeak Sue Hoe, Ahmad Razin Zainal Abidin, and Mohd Ridza Mohd Haniffah. "Numerical Calculation of Two-Dimensional Subsea Cable Tension Problem Using Minimization Approach." MATEMATIKA 35, no. 4 (December 31, 2019): 15–32. http://dx.doi.org/10.11113/matematika.v35.n4.1261.

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Subsea cable laying is a risky and challenging operation faced by engineers, due to many uncertainties arise during the operation. In order to ensure that subsea cables are laid out diligently, the analysis of subsea cable tension during the laying operation is crucial. This study focuses on the fatigue failure of cables that will cause large hang-off loads based on catenary configuration after laying operation. The presented problem was addressed using mathematical modelling with consideration for a number of defining parameters, which include external forces such as current velocity and design parameters such as cable diameter. There were two types of subsea cable tension analyses studied: tensional analysis of catenary configurations and tensional analysis of lazy wave configurations. The latter involved a buoyancy module that was incorporated in the current catenary configuration that reduced subsea cable tension and enhanced subsea cable lifespan. Both analyses were solved using minimization through the gradient-based approach concerning on the tensional analysis of the subsea cable in differentconfigurations. Lazy wave configurations were shown to successfully reduce cable tension,especially at the hang-off section.

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Yu, Long, and Jia-hua Tan. "Numerical Investigation of Seabed Interaction in Time Domain Analysis of Mooring Cables." Journal of Hydrodynamics 18, no. 4 (August 2006): 424–30. http://dx.doi.org/10.1016/s1001-6058(06)60115-7.

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Robert, Bright Chimezie, Muhammad Umar Fareed, and Harold Steven Ruiz. "How to Choose the Superconducting Material Law for the Modelling of 2G-HTS Coils." Materials 12, no. 17 (August 22, 2019): 2679. http://dx.doi.org/10.3390/ma12172679.

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In an attempt to unveil the impact of the material law selection on the numerical modelling and analysis of the electromagnetic properties of superconducting coils, in this paper we compare the four most common approaches to the E-J power laws that serve as a modelling tool for the conductivity properties of the second generation of high-temperature superconducting (2G-HTS) tapes. The material laws considered are: (i) the celebrated E-J critical-state like-model, with constant critical current density and no dependence with the magnetic field; (ii) the classical Kim’s model which introduces an isotropic dependence with the environment magnetic field; (iii) a semi-empirical Kim-like model with an orthonormal field dependence, J c ( B ) , widely used for the modelling of HTS thin films; and (iv) the experimentally measured E–J material law for SuperPower Inc. 2G-HTS tapes, which account for the magneto-angular anisotropy of the in-field critical current density J c ( B ; θ ) , with a derived function similar to Kim’s model but taking into account some microstructural parameters, such as the electron mass anisotropy ratio ( γ ) of the superconducting layer. Particular attention has been given to those physical quantities which within a macroscopic approach can be measured by well-established experimental setups, such as the measurement of the critical current density for each of the turns of the superconducting coil, the resulting distribution of magnetic field, and the curve of hysteretic losses for different amplitudes of an applied alternating transport current at self-field conditions. We demonstrate that although all these superconducting material laws are equally valid from a purely qualitative perspective, the critical state-like model is incapable of predicting the local variation of the critical current density across each of the turns of the superconducting coil, or its non-homogeneous distribution along the width of the superconducting tape. However, depending on the physical quantity of interest and the error tolerance allowed between the numerical predictions and the experimental measurements, in this paper decision criteria are established for different regimes of the applied current, where the suitability of one or another model could be ensured, regardless of whether the actual magneto angular anisotropy properties of the superconducting tape are known.

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Amadio, Claudio, and Chiara Bedon. "Multiple Dissipative Devices for Blast-Resisting Cable-Supported Glazing Façades." Modelling and Simulation in Engineering 2013 (2013): 1–13. http://dx.doi.org/10.1155/2013/964910.

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The paper analyzes the structural response of a high-level air blast loaded cable-supported façade. Since the glass panels and the cables present a typical brittle behavior and are subjected to elevated tensile stresses when a high-level explosion occurs, multiple dissipative devices are simultaneously introduced in the conventional glazing system to mitigate the maximum effects of the design blast wave. Dynamic analyses are performed using a sophisticated FE-model to describe accurately the response of the façade equipped by dissipative devices. Based on numerical results of previous contributions, viscoelastic spider connectors (VESCs) are introduced in the points of connection between glass panels and pretensioned cables, to replace “rigid” spider connectors commonly used in practice. At the same time, rigid-plastic frictional devices (RPDs) are installed at the top of the bearing cables to mitigate furthermore the bracing system. As a result, due to the combined use of VESCs and RPDs opportunely calibrated, the maximum tensile stresses in the glass panels and in the cables appear strongly reduced. In addition, the proposed devices do not trouble the aesthetics of such transparent structural systems. At last, simple design rules are presented to predict the response of cable-supported façades subjected to high-level dynamic loads and to preliminary estimate the mechanical parameters of combined VESCs and RPDs.

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Mohammadian, Behrouz, Mehdi Sarayloo, Ahmed Abdelaal, Asif Raiyan, Douglas K. Nims, and Hossein Sojoudi. "Experimental and Theoretical Studies of Wet Snow Accumulation on Inclined Cylindrical Surfaces." Modelling and Simulation in Engineering 2020 (February 20, 2020): 1–11. http://dx.doi.org/10.1155/2020/9594685.

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Wet snow accumulation on bridge cables and its shedding due to external phenomena such as rise in temperature, wind, and gravity is a serious threat to the safety of cars and pedestrians crossing the bridge. Commonly the accumulated snow on bridge cables is removed by external means such as mechanical removal or heat treatment which are expensive, time-consuming, and high-risk processes and are conducted based on little or no information available regarding the actual size and shape of the accumulated snow. In addition, cleaning of cables using the mechanical methods can potentially lead to erosion of cable materials when applied over years, resulting in enhanced surface roughness and potentially increased wet snow/ice accumulation during future precipitation events, and sometimes might require replacement of cable stays, which is an extremely costly and complicated task. Optimizing the number of mechanical cleaning procedures such as chain release through predicting the shape and thickness of the accumulated snow on the cable stays reduces the cost, time, and risk associated with the process. In this study, wet snow accumulation on torsionally rigid inclined cylinders of high-density polyethylene (HDPE) has been studied experimentally and numerically. A 2-D numerical model has been developed utilizing weather data to predict the thickness and the shape of the accumulated wet snow on inclined cylindrical surfaces. Outdoor experiments were also conducted to measure the density and thickness of accumulated snow, while monitoring the weather data real time. Overall, snow density was found to be linearly increasing with an increase in wind velocity, during snow precipitation. The maximum thickness and shape of the accumulated snow on cables obtained from the numerical model were found to be in good agreement with the outdoor experimental data. This work aims to provide a mean for prediction of snow accumulation on surfaces for optimizing the efficiency of the costly and high-risk snow removal procedures.

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Teng, Yu Ping, Shao Tao Dai, Li Ye Xiao, Dong Zhang, and Bing Song Cheng. "The Electric Field Analysis of the Warm Dielectric HTS Power Cable." Applied Mechanics and Materials 347-350 (August 2013): 1276–82. http://dx.doi.org/10.4028/www.scientific.net/amm.347-350.1276.

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The 75 m/1.5 kA AC high-temperature superconducting cable(75 m HTS cable) and the 360 m/10 kA DC HTS power cable (10 kA HTS cable), which are supported by Chinese State 863 projects, are both of the demonstration projects facing to industrialization application. The characteristic in structure of warm dielectric (WD) insulated HTS cable is introduced. The electric field distribution characteristic at the cryogenic envelope body, the end-point of metallic shield layer at the end of the HTS cable and the connection sections are analyzed; the controlling method for electric field stress is introduced; there is serious concentration of electric field both in the termination and the connection sections between the termination and the cryogenic envelope. It is difficult to calculate the electric field of the part with irregular or special structure by resolution analytical methods, and the numerical analysis method is effective to analyze the electric field of the shaped structural part for HTS cable. The electric analysis, simulation, the design and processing of insulation for the two cables are finished based upon these two cables run well by now.

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Hong, Z., Q. Jiang, R. Pei, A. M. Campbell, and T. A. Coombs. "A numerical method to estimate AC loss in superconducting coated conductors by finite element modelling." Superconductor Science and Technology 20, no. 4 (February 26, 2007): 331–37. http://dx.doi.org/10.1088/0953-2048/20/4/006.

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Liess, H. D., and A. Ilgevičius. "ANALYTICAL VERSUS NUMERICAL CALCULATIONS OF PHYSICAL PROBLEMS. THE BENEFITS OF ITS COMBINATION." Mathematical Modelling and Analysis 8, no. 4 (December 31, 2003): 291–302. http://dx.doi.org/10.3846/13926292.2003.9637231.

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The disadvantage of the pure application of numerical approaches, however, is the fact, that the physicals laws behind are not so easy to visualize, the results art not so easy to generalize, and the storage of the information requires mostly an extensive amount of data. This paper would like to show at some examples the advantages of the combination of both methods. The key part of this approach is the calculation of the heat transfer by the Finite Volume Method (FVM) and the approximation of the calculated data by the so‐called “simplified equations”. These simplified equations were received by analytical solutions of the basic heat conduction equation. The required adaptation of the numerical results was done with properly adapted fitting algorithms on the basis of the elaborated analytical solutions, a process which was leading to an enormous reduction of data. As a result it became possible to describe the applied tasks by a few characteristic constants. Another approach for an analytical solution with a numerical calculation process is the determination of the so‐called “properties of mixed magnitudes”. As an example this principle has been applied for the numerical calculation of electrical multi conductor containing cables. This process allowed the prediction of the thermal behavior of any cable harness with the required precision.

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Palm, Johannes, and Claes Eskilsson. "Influence of Bending Stiffness on Snap Loads in Marine Cables: A Study Using a High-Order Discontinuous Galerkin Method." Journal of Marine Science and Engineering 8, no. 10 (October 13, 2020): 795. http://dx.doi.org/10.3390/jmse8100795.

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Marine cables are primarily designed to support axial loads. The effect of bending stiffness on the cable response is therefore often neglected in numerical analysis. However, in low-tension applications such as umbilical modelling of ROVs or during slack events, the bending forces may affect the slack regime dynamics of the cable. In this paper, we present the implementation of bending stiffness as a rotation-free, nested local Discontinuous Galerkin (DG) method into an existing Lax–Friedrichs-type solver for cable dynamics based on an hp-adaptive DG method. Numerical verification shows exponential convergence of order P and P+1 for odd and even polynomial orders, respectively. Validation of a swinging cable shows good comparison with experimental data, and the importance of bending stiffness is demonstrated. Snap load events in a deep water tether are compared with field-test data. The bending forces affect the low-tension response for shorter lengths of tether (200–500 m), which results in an increasing snap load magnitude for increasing bending stiffness. It is shown that the nested LDG method works well for computing bending effects in marine cables.

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Heinrich, R., R. Jobava, W. Kalkner, and A. Gheonjian. "Numerical modelling for investigation and optimization of a sensor for sensitive partial discharge detection on high-voltage XLPE cables." European Transactions on Electrical Power 10, no. 3 (September 7, 2007): 161–66. http://dx.doi.org/10.1002/etep.4450100306.

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Amadio, Claudio, and Chiara Bedon. "Dynamic Response of Cable-Supported Façades Subjected to High-Level Air Blast Loads: Numerical Simulations and Mitigation Techniques." Modelling and Simulation in Engineering 2012 (2012): 1–13. http://dx.doi.org/10.1155/2012/863235.

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A glazing façade subjected to blast loads has a structural behaviour that strongly differs from the typical response of a glazing system subjected to ordinary loads. Consequently, sophisticated modelling techniques are required to identify correctly its criticalities. The paper investigates the behaviour of a cable-supported façade subjected to high-level blast loading. Nonlinear dynamic analyses are performed in ABAQUS/Explicit using a sophisticated FE-model (M01), calibrated to dynamic experimental and numerical results. The structural effects of the total design blast impulse, as well as only its positive phase, are analyzed. At the same time, the possible cracking of glass panels is taken into account, since this phenomenon could modify the response of the entire façade. Finally, deep investigations are dedicated to the bearing cables, since subjecting them to elevated axial forces and their collapse could compromise the integrity of the cladding wall. Based on results of previous studies, frictional devices differently applied at their ends are presented to improve the response of the façade under the impact of a high-level explosion. Structural effects of various solutions are highlighted through dynamic simulations. Single vertical devices, if appropriately calibrated, allow reducing significantly the axial forces in cables, and lightly the tensile stresses in glass panes.

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Zhao, Yaobing, and Henghui Lin. "Nonlinear Dynamics of Suspended Cables under Periodic Excitation in Thermal Environments: Two-to-One Internal Resonance." International Journal of Bifurcation and Chaos 31, no. 10 (August 2021): 2150153. http://dx.doi.org/10.1142/s0218127421501534.

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The temperature change is a non-negligible factor in examining the vibration behaviors of the cable structures. For this reason, the paper aims at investigating the thermal effects on suspended cables’ resonant responses considering two-to-one internal resonances. Firstly, a nonlinear continuous condensed model of the suspended cable under periodic excitation in thermal environments is adopted. Then, a multidimensional discretized model is constructed via the Galerkin method. Following the multiple scaling procedure, the modulation equations with both polar and Cartesian forms are obtained, which are solved numerically. A complete dynamic scenario is presented through bifurcation diagrams, phase portraits, time history curves, Fourier spectra, and Poincaré sections in three internal resonant cases. Numerical examples show that a small change in the static configuration due to thermal effects induces some noticeable changes in dynamic behaviors. The response amplitude, the nonlinear spring behavior, the resonant and stability region, the multi-periodic and chaotic motions are all dependent on temperature changes. Additional Hopf bifurcations might be found due to temperature changes, and it may lead to some more complicated dynamic characteristics. A good agreement between the perturbation and numerical solutions is observed to confirm the results’ correctness and accuracy.

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Wang, K. F., Y. Q. Wang, B. L. Wang, and L. Zheng. "A double cantilever beam incorporating cohesive crack modeling for superconductors." Modern Physics Letters B 34, no. 15 (March 30, 2020): 2050166. http://dx.doi.org/10.1142/s0217984920501663.

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In this paper, a double cantilever beam (DCB) specimen incorporating cohesive crack is developed for superconductors which have potential applications in high temperature superconducting cables in space solar power station. The cohesive interface is introduced along the crack front of the DCB model under electromagnetic force. The load-separation relation (i.e. the crack opening displacement) is used as the fracture mechanics parameter and the corresponding curves during fracture process are obtained and verified by the finite element numerical method. Results show that the presence of tensile electromagnetic force makes crack propagate easily. Superconductors with small cracks have good adaptability to the oscillation of magnetic fields while that with large cracks are easier to fracture during the descent of the magnetic field. In addition, the ductility ratio of the cohesive interface can significantly increase the fracture strength. The length of fracture zone decreases as the crack length increases.

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Journal articles on the topic 'Numerical modelling of superconducting cables'

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