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Tetsuya Kojima,Toshihiko Takauchi,Toshifumi Ise,Isao Iyoda,Hiroyuki Sasao,Yoshiyuki Kono,Koji Temma,Nobuyoshi Inoue,Akira Kawamoto 전력전자학회 2004 ICPE(ISPE)논문집 Vol.- No.-
A new parallel type voltage sag compensator is proposed. The proposed system can reduce the necessary capacity of a storage capacitor for voltage sag compensation by boost type power factor correction rectifier getting charging energy from residual voltage of utilities as it compensates the load voltage. This paper shows principle and control system of the proposed circuit. Compensation<br/> performances are demonstrated by experiments.
Rotordynamic Characteristics of Floating Ring Seals in Rocket Turbopumps
Tokunaga, Yuichiro,Inoue, Hideyuki,Hiromatsu, Jun,Iguchi, Tetsuya,Kuroki, Yasuhiro,Uchiumi, Masaharu Korean Society for Fluid machinery 2016 International journal of fluid machinery and syste Vol.9 No.3
Floating ring seals offer an opportunity to reduce leakage flows significantly in rotating machinery. Accordingly, they have been applied successfully to rotating machinery within the last several decades. For rocket turbopump applications, fundamental behavior and design philosophy have been revealed. However, further work is needed to explore the rotordynamic characteristics associated with rotor vibrations. In this study, rotordynamic forces for floating ring seals under rotor's whirling motions are calculated to elucidate rotordynamic characteristics. Comparisons between numerical simulation results and experiments demonstrated in our previous report are carried out. The three-dimensional Reynolds equation is solved by the finite-difference method to calculate hydrodynamic pressure distributions and the leakage flow rate. The entrance loss at the upstream inlet of the seal ring is calculated to estimate the Lomakin effect. The friction force at the secondary seal surface is also considered. Numerical simulation results showed that the rotordynamic forces of this type of floating ring seal are determined mainly by the friction force at the secondary seal surface. The seal ring is positioned almost concentrically relative to the rotor by the Lomakin effect. Numerical simulations agree quite well with the experimental results.
Joshi, Navin Chandra,Magara, Tetsuya,Inoue, Satoshi IOP Publishing 2014 The Astrophysical journal Vol.795 No.1
<P>We present observations of compound flux rope formation, which occurred on 2014 January 1, via merging of two nearby filament channels, the associated dynamics, and its stability using multiwavelength data. We also discuss the dynamics of cool and hot plasma moving along the newly formed compound flux rope. The merging started after the interaction between the southern leg of the northward filament and the northern leg of the southward filament at approximate to 01:21 UT and continued until a compound flux rope formed at approximate to 01:33 UT. During the merging, the cool filament plasma heated up and started to move along both sides of the compound flux rope, i.e., toward the north (approximate to 265 km s(-1)) and south (approximate to 118 km s(-1)) from the point of merging. After traveling a distance of approximate to 150 Mm toward the north, the plasma cooled down and started to return back to the south (approximate to 14 km s(-1)) after approximate to 02:00 UT. The observations provide a clear example of compound flux rope formation via merging of two different flux ropes and the occurrence of a flare through tether cutting reconnection. However, the compound flux rope remained stable in the corona and had a confined eruption. The coronal magnetic field decay index measurements revealed that both the filaments and the compound flux rope axis lie within the stability domain (decay index <1.5), which may be the possible cause for their stability. The present study also deals with the relationship between the filament's chirality (sinistral) and the helicity (positive) of the surrounding flux rope.</P>