Analytical Formulation of $I_{c}$ Dependence on Torsion of YBCO and BSCCO Conductors

Fleiter, J.; Sitko, M.; Ballarino, A.

doi:10.1109/tasc.2012.2228292

Cited by 13 publications

(5 citation statements)

References 10 publications

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“…For a tape in which the filaments had a twist pitch of 10 mm, the experiment results of the self-field AC loss were a little smaller than those of their straight filament counterparts [50]. For a tape under torsional deformation, however, the critical damage twist pitch is about 100 mm [37,51,52], much bigger than 10 mm. This means that when a twist pitch of 10 mm is applied to a Bi-2223/Ag straight multi-filamentary HTS tape, a large range of damage will occur in the Bi-2223 superconducting filaments.…”

Section: Resultsmentioning

confidence: 87%

Strain dependence of critical current and self-field AC loss in Bi-2223/Ag multi-filamentary HTS tapes: a general predictive model

Gao

Wang

Zhou

2019

Supercond. Sci. Technol.

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It is well known that mechanical deformations have a strong impact on the critical current (I c ) of Bi-2223/Ag multi-filamentary high-temperature superconducting (HTS) tapes, and a remarkable I c degradation is induced, which results in a significant AC loss. In this paper, a general predictive model based on the strain dependence of the Weibull distribution function of statistical damage of superconducting filaments and the Norris formula is developed to explore the influence of the uniaxial, bending and torsional deformation on I c degradation and self-field AC loss of Bi-2223/Ag HTS composite tapes. A unified strain dependence of the I c formula is suggested, which is extended in view of the I c degradation mechanism of Bi-2223/Ag HTS tapes under a uniaxial deformation with an introduction of longitudinal strain to unify the strain in uniaxial, bending and torsional deformation modes. Then, a modified Norris formula is deduced in light of the unified strain dependence of the I c model to predict AC loss of Bi-2223/Ag HTS tapes. With a set of appropriate model parameters determined by the tested data of I c under uniaxial deformation, the presented model can well predict both I c degradation and AC loss behaviors under not only a uniaxial deformation mode, but the bending and torsional ones. The proposed model indicates that the significant increase of AC loss for a deformed tape is presented due to the notable degradation of I .

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Section: Resultsmentioning

confidence: 87%

Strain dependence of critical current and self-field AC loss in Bi-2223/Ag multi-filamentary HTS tapes: a general predictive model

Gao

Wang

Zhou

2019

Supercond. Sci. Technol.

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“…In this paper, results of experimental tests were used as input data to ANFIS. In [29][30][31][32][33][34][35][36][37], the experimental data are attained with respect to the electromechanical behaviour of different YBCO tapes under various thermomagnetic conditions based on the procedure shown in figure 6. The first step is to apply a mechanical load to the coated conductor.…”

Section: Resultsmentioning

confidence: 99%

“…Specifications of superconducting tapes used for analysing data[29][30][31][32][33][34][35][36][37].…”

mentioning

confidence: 99%

Advanced experimental-based data-driven model for the electromechanical behavior of twisted YBCO tapes considering thermomagnetic constraints

Yazdani-Asrami

Sadeghi

Seyyedbarzegar

et al. 2022

Supercond. Sci. Technol.

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Data-driven models can predict, estimate, and monitor any highly nonlinear and multi-variable behavior of high temperature superconducting (HTS) materials, and superconducting devices to analyze their characteristics with very high accuracy in almost real time, which is a significant figure of merit as compared with traditional numerical approaches. The electromechanical behavior of twisted HTS tapes under different strains, magnetic fields, and temperatures is a complicated problem to be solved using conventional approaches, including finite element-based methods, otherwise, experimental testing is needed to characterize it. This paper aims to offer a data-driven model based on artificial intelligence techniques to predict the electromechanical behavior of HTS tapes operating under various thermomagnetic conditions. By using the proposed model, normalized critical current value and stress of twisted tapes can be predicted under different temperatures and magnetic flux densities. For this purpose, experimental data were used as inputs to design an Adaptive Neuro-Fuzzy Inference System (ANFIS). To gain the best performance of the designed prediction system, multiple clustering methods have been used, such as the grid partitioning method, fuzzy c-means clustering method, and sub-clustering method. Sensitivity analyses were conducted to find the best architecture of ANFIS to predict and model electromechanical behavior of twisted tapes with high accuracy.

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“…If the mechanical limits surpass the threshold value, the critical current abruptly becomes zero. The correlation between the strain and the critical current of tapes is expressed in (15)(16)(17)(18)(19) [34]:…”

Section: B Modeling Formulationmentioning

confidence: 99%

“…In ( 16), ߝ is the maximum strain value of tapes. The other parameters are tabulated in Table III [34]. Figure 2 illustrates the normalized value of the critical current in different locations while the strain is varied.…”

Section: B Modeling Formulationmentioning

confidence: 99%

A Simple and Fast Computation Equivalent Circuit Model to Investigate the Effect of Tape Twisting on the AC Loss of HTS Cables

Sadeghi

Barzegar

Yazdani-Asrami

2022

Eng. Technol. Appl. Sci. Res.

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This paper aims to evaluate the AC loss of a High Temperature Superconducting (HTS) cable with respect to the twisting angle while considering mechanical constraints in an iterative approach. A 1km 22.9kV AC HTS cable was selected in this study to assess the impact of the twisting angle alterations. The electromagnetic behavior of the selected HTS cable was modeled using an Equivalent Circuit Model (ECM). After the implementation of this model in MATLAB/SIMULINK, a series of simulations were performed without the consideration of mechanical limits. They showed that the increase in the twisting angle leads to the decrease of the AC loss. Afterwards, simulations were conducted to reduce the AC loss, while mechanical limits were taken into account. This improvement could reduce the AC loss by 27.41% with a much lower computation time than Finite Element Methods (FEMs).

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Analytical Formulation of $I_{c}$ Dependence on Torsion of YBCO and BSCCO Conductors

Cited by 13 publications

References 10 publications

Strain dependence of critical current and self-field AC loss in Bi-2223/Ag multi-filamentary HTS tapes: a general predictive model

Strain dependence of critical current and self-field AC loss in Bi-2223/Ag multi-filamentary HTS tapes: a general predictive model

Advanced experimental-based data-driven model for the electromechanical behavior of twisted YBCO tapes considering thermomagnetic constraints

A Simple and Fast Computation Equivalent Circuit Model to Investigate the Effect of Tape Twisting on the AC Loss of HTS Cables

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