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3-D optimal design of laminated yoke of billet heater for rolling wire rod using ON/OFF method

Takahashi N., Nakazaki S., Miyagi D., Uchida N., Kawanaka K., Namba H. H.

Archives of Electrical Engineering

2012

Vol. 61, nr 1

115-123

The optimization method using the ON/OFF sensitivity analysis has an advantage hat an epoch-making construction of magnetic circuit may be obtained. Therefore, it is attractive for designers of magnetic devices. We have already developed the ON/OFF method for the optimization of a static magnetic field problem, and the effectiveness is verified by applying it to the optimization of magnetic recording heads. In this paper, the ON/OFF sensitivity method is extended to the optimization of the eddy current problem using the adjoint variable. The newly developed ON/OFF method is applied to the determination of the optimal topology of the yoke of the billet heater for rolling wire rod. As a result, the optimal shape of yoke, which we could not imagine beforehand can be obtained. It is shown that the local heating of the yoke was reduced without decreasing the heating efficiency.

Water treatment including surfactant using a pulsed discharge

Yamabe C., Nakazaki S., Ihara S.

Przegląd Elektrotechniczny

2009

R. 85, nr 5

105-108

An industrial wasted water including surfactant such as the Nonylphenol ethoxylate (NPEO) was treated by a pulsed discharge. The effect of treatment was estimated by the COD measurements. The generation of active radicals such as atomic oxygen whose emission wavelength was 777 nm and OH radicals whose emission wavelength was 306.7 nm and 308.9 nm were confirmed at the different repetition rate of discharge (100 - 300 Hz) by the measurements of optical emission spectroscopy. The COD removal rate of about 19 % was obtained and the efficiency of wasted water treatment was 0.74 mg/kWh.

Poddawano obróbce ścieki przemysłowe za pomocą wyładowania impulsowego z nonylofenonem (NFD). Skuteczność obróbki określono za pomocą współczynnika chemicznego zapotrzebowania tlenu(COD). Za pomoca optycznej spektrometrii emisyjnej zaobserwowano powstawanie aktywnych rodników, takich jak: tlen atomowy (długość fali 777 nm) oraz OH (o długościach fali emisji 308,9 i 306,7 mm), dla czestotliwosci wyładowania z zakresu od 100 do 300 Hz. Uzyskano ok. 19% obniżenie COD oraz sprawnośc energetyczną obróbki ścieków 0,74 mg/kWh