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박기락(G.L. Park),최재호(J.H. Choi),김태웅(T.W. Kim) 전력전자학회 2003 전력전자학술대회 논문집 Vol.2003 No.7(2)
In the paper, a three-phase-in three-phase-out Matrix Converter(MC) for the PMSM is simulated by the PSIM simulator A lighter L-C filters are installed at the input side of the Converter to remove the current harmonics around the switching frequency In modelling the Matirx Converter, the PSIM is the powerful tool that the basic researches can be quickly performed within the given periods, because the simulation calculation by PSIM is very fast, compared to other simulators such as Matlab, Saber, and Pspice<br/>
저합금 고장력강 용접열영향부의 S . R . 귀열 발생 기구에 관한 연구
이종섭,김태웅,장래웅,엄기원 대한금속재료학회(대한금속학회) 1989 대한금속·재료학회지 Vol.27 No.3
This study was carried out to investigate the mechanism of S. R. cracking in HAZ of high strength low alloy steel. Among 3 commercial high strength steels, steel A (HT80), which is equivalent to ASTM A514 Gr.F. was most susceptible to S. R cracking whereas steel C(HT60) showed no crack in oblique Y-groove test even in high restraint. The cause of S. R cracking along the coarsened austenite grain boundary was secondary hardening phenomenon and impurity segregation to the prior austenite grain boundary. The crack susceptibility was reduced as increasing heat input due to the weakening of secondary hardening.