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Liu H.,Tongji University | Su Y.,Tongji University | Wang Y.,Tongji University | Yue J.,Tongji University | Luo S.,Traction Power State Key Laboratory
Advanced Materials Research | Year: 2012

This paper deals with the application of interval arithmetic in internal model control (IMC) for suspension systems. The IMC problem is expressed as an optimization of filter parameters. And the optimization can be solved by branch-and-bound scheme with interval arithmetic techniques. We present the algorithm for the model of suspension systems. The effectiveness of the algorithm is demonstrated through simulation results. © (2012) Trans Tech Publications, Switzerland. Source


Yen F.,Southwest Jiaotong University | Yen F.,National Laboratory for Rail Transit | Yen F.,Traction Power State Key Laboratory | Lin Q.,Southwest Jiaotong University | And 15 more authors.
IEEE Transactions on Applied Superconductivity | Year: 2012

The critical current density of optimally doped bulk YBCO superconductor has been found to increase with the application of external hydrostatic pressure. This paper reports the transport measurements of the critical current (I c) of YBCO in the form of a coated conductor (CC) wire under hydrostatic pressure up to 0.24 GPa at 77 K. No noticeable change was observed in both the I c and n-value of the CC sample in the studied pressure range. Two possible scenarios are discussed to explain the observed effect. © 2012 IEEE. Source


Yen F.,Southwest Jiaotong University | Yen F.,Traction Power State Key Laboratory | Yen F.,National Laboratory for Rail Transit | Li J.,Southwest Jiaotong University | And 17 more authors.
IEEE Transactions on Applied Superconductivity | Year: 2011

A method to transport up to 180 A of current into the sample space of a pressure cell without causing thermal instabilities at 77 K was developed in order to study the critical current Ic of samples of first-generation Bi-2223 superconducting wire at different hydrostatic pressures. Ic was found to linearly decrease with increasing application of external pressure and was found to be irreversible upon release of pressure. The n-value of the voltage-current curves at different pressure was also found to systematically decrease. The decrease in Ic and the irreversibility effect is attributed to the deformation of the filamentary walls of the wire. © 2006 IEEE. Source

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