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Sato, Masayasu; Kawashima, Hisato; Miura, Yukitoshi; Tsuzuki, Kazuhiro; Kimura, Haruyuki; Uehara, Kazuya; Ogawa, Toshihide; Isei, Nobuaki; Tani, Takashi; Akiyama, Takashi*; et al.
Fusion Engineering and Design, 51-52(Part.B), p.1071 - 1076, 2000/11
Times Cited Count：15 Percentile：68.6(Nuclear Science & Technology)no abstracts in English
; Aoto, Kazumi;
JNC TN9400 99-061, 32 Pages, 1999/07
In this report, reconstruction of magnetic charges induced by mechanical damages in a test piece of SUS304 stainless steel is performed as a part of eforts to establish a passive nondestructive testing method on the basis of the inspection of leakage magnetic field. The approach for solving this typical ill-posed inverse problem is selected as a way in the least square method category. Concerning the ill-poseness of the system of equations, an iteration algorithm is adopted to its solving in which the designations of initial profile, the weight coefficients and the total number of iterations are taken as means of reqularization. From examples using simulated input data, it is verified that the approach gives good reconstruction results in case of signals with a relative high S/N ratio. For improving the robustness of the proposed method, a Galerkin procedure with base functions chosen as the Daubechies' wavelet is also introduced for discretizing the governing equation. By comparing the reconstruction results of the least square method and those using wavelet discretization, it is found that the wavelet used approach is more feasible in the inversion of noise polluted signals. Reconstruction of 1-D and 2-D magnetic charges with the least square strategy and reconstruction of an 1-D problem with the wavelet used method are carried out from both simulated and measured magnetic field signals which are used as the validation of the proposed inversion strategy.
Kurihara, Kenichi; Kawamata, Yoichi
Fusion Technology 1996, 1, p.795 - 798, 1997/00
no abstracts in English
Kobayashi, Hideki*; *; Sasaki, Shigemi; Shimada, Taihei; Takao, Masaru*; *;
JAERI-Tech 96-014, 14 Pages, 1996/03
no abstracts in English
Sasaki, Shigemi; *; *; *; Ono, Hideo
Proc. of the 1991 IEEE Particle Accelerator Conf., p.2715 - 2717, 1992/00
no abstracts in English
; *; Yoshida, H.; ; ; ; ;
JAERI-M 86-006, 48 Pages, 1986/02
no abstracts in English
