• Title/Summary/Keyword: do-noise

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Electrical Characteristics and Electromagnetic Excitation Force Comparison of PM Motor according to the Driving method (영구자석형 전동기의 구동방법에 따른 전기적 특성 및 전자기적 가진원 분석)

  • Lee, Su-Jin;Kim, Do-Jin;Lee, Byeong-Hwa;Hong, Jung-Pyo
    • Transactions of the Korean Society for Noise and Vibration Engineering
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    • v.23 no.2
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    • pp.144-151
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    • 2013

  • This paper presents a result of the mechanical noise and vibration analysis as well as the electrical characteristics analysis of the permanent magnet(PM) motor according to the driving method that is Brushless DC(BLDC) drive and Brushless AC(BLAC) drive. To do that, the characteristics of the PM motor, which have the same output power but different driving method, are investigated. At that time, the characteristics such as torque, torque ripple and flux density, and so on, are obtained by finite element analysis(FEA). Besides, noise and vibration are obtained by spectrum analysis. The magnetic noise is defined as noise generated from vibrations due to electromagnetic excitation force. In this paper, the electromagnetic excitation force is analyzed and design process of noise reduction is proposed. Finally, The validity of the analysis results is verified by test.

  • https://doi.org/10.5050/KSNVE.2013.23.2.144 인용 PDF KSCI

Effects of Noise on a Model of Oscillatory Chemical Reaction

  • Basavaraja, C.;Bagchi, Biman;Park, Do-Young;Choi, Young-Min;Park, Hyun-Tae;Choe, Sang-Joon;Huh, Do-Sung
    • Bulletin of the Korean Chemical Society
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    • v.27 no.10
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    • pp.1525-1530
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    • 2006

  • A simple oscillating reaction model subject to additive Gaussian white noise is investigated as the model is located in the dynamic region of oscillations. The model is composed of three ordinary differential equations representing the time evolutions of X, Y, and Z, respectively. Initially, a uniform random noise is separately added to the three equations to study the effect of noise on the oscillatory cycle of X, Y, and Z. For a given value of noise intensity, the amplitude of oscillation increases monotonically with time. Furthermore, the noise is added to any one of the three equations to study the impact of noise on one species on the bifurcation behavior of the other.

  • https://doi.org/10.5012/bkcs.2006.27.10.1525 인용 PDF KSCI

Characteristics Comparison of PM Motor according to the Driving method (영구자석형 전동기의 구동방법에 따른 전자기적 특성 및 진동 소음 비교)

  • Hong, Jung-Pyo;Lee, Su-Jin;Kim, Do-Jin;Lee, Byeong-Hwa;Jang, Woo-Kyo
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2012.10a
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    • pp.522-527
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    • 2012

  • This paper presents a result of the mechanical noise and vibration analysis as well as the electrical characteristics analysis of the permanent magnet (PM) motor according to the driving method that is Brushless DC (BLDC) drive and Brushless AC (BLAC) drive. To do that, the characteristics of the PM motor, which have the same output power but different driving method, are investigated. At that time, the characteristics such as torque, torque ripple and flux density, and so on, are obtained by finite element analysis (FEA). Besides, noise and vibration are obtained by spectrum analysis. The magnetic noise is defined as noise generated from vibrations due to electromagnetic excitation force. In this paper, the electromagnetic excitation force is analyzed and design process of noise reduction is proposed. Finally, The validity of the analysis results is verified by test.

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Change of Survival, Growth Rate and Hormone Secretion in the Juvenile Trionyx sinensis Exposed to Construction Noise (건설소음이 자라의 생존, 성장률 및 호르몬분비에 미치는 영향)

  • Park, Jong Ho;Cho, Kyu Seok;Lee, Byung-Chan;Yeon, Ik Jun;Cho, Byung Yeol;Park, Sang Chan
    • Journal of Korean Society on Water Environment
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    • v.22 no.4
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    • pp.706-710
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    • 2006

  • To evaluate impacts of the construction noise, Trionyx sinensis, inland fishers aquacultural organism, were exposed to control groups (about 55 dB) and noise groups (80 dB). The survival, growth rate and feeding efficiency of the juvenile Trionyx sinensis were measured at 10, 20 and 30 days intervals (each 9 hours/day). No significant mortality occurred during the experiments, but growth rates (1.7 times) and feeding efficiency (1.83 times) showed significant reduction in time-dependent manner. Also, serum cortisol (6.7 times) and corticosterone levels (1.37 times) in noise groups significantly increased by the noise exposure, compared to the controls, In conclusion, this study may provide the fundamental knowledge on adverse effects Trionyx sinensis and apply to assessments on the impacts of aquaculture industry by construction noise.

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