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정재덕(Jung, Jae-Deok),홍석윤(Hong, Suk-Yoon),길현권(Kil, Hyun-Gwon),송지훈(Song, Jee-Hun),권현웅(Kwon, Hyun-Wung),전재진(Jeon, Jae-Jin),서영수(Seo, Youngsoo) 한국소음진동공학회 2013 한국소음진동공학회 논문집 Vol.23 No.7
Underwater acoustic sensors are significantly damaged from underwater explosion. The damage that affects sensor should be evaluated for its smooth operations and safety. For satisfying these objectives, it is necessary to obtain more accurate values of the pressure and the energy flux density by distance. This paper is divided into two part. First, to obtain more accurate value of the pressure and the energy flux density at each point, the simulation results and the reference values were compared. For fitting to the reference pressure and the reference energy flux density, the sizes of fluid and TNT model are corrected, and the comparison results show good agreements. Second, based on these results, the structural integrity of underwater sensor structure was analyzed when TNT located in 10 meters from underwater sensors structure. This simulation used the commercial software MSC/DYTRAN.
고조파 전류 주입을 통한 견인전동기의 소음 진동 저감연구
정재덕(Jae-Deok Jung),정경태(KyungTae Jung),송경태(KyungTae Song) 한국자동차공학회 2023 한국자동차공학회 부문종합 학술대회 Vol.2023 No.5
As the electric vehicle market expands, the developing engineers have been putting lots of efforts into the electromagnetic noise reduction of the traction motors. The fundamental source of electromagnetic noise stems from the torque ripple and electromagnetic radial force reacting between rotor and stator of motors. Many approaches have been introducing a lot of methods to reduce the torque ripple, the research has studied the harmonic current injection method which is reducing torque ripple by adding a specific current value and phase into the input current. It was evaluated that the torque ripple is lowered from 3.43% to 0.68% under base rpm, and from 14.63% to 2.88% at high speed. And the radiated power level was also lowered at 2000 and 10,000 rpm by 2 dB and 1 dB respectively, and the radiated power in watt was reduced by 37% and 21% respectively. However, it is expected that it can be applied limitedly only below a certain speed because precise control is required.