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Analysis of Vibration and Electromagnetic Forces on a Generator End-winding for 500 MW Fossil Power Plant (500MW 급 대형 발전기 권선단부의 전자기력과 동특성 해석)

  • 김철홍;주영호
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2001.11b
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    • pp.826-831
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    • 2001

  • Electromagnetic forces generate vibrations in the end-winding of large generators. A finite element analysis using a commercial S/W is performed to calculate electromagnetic force of end-winding in two pole generator for 500 MW fossil power plant. Also, this paper presents analytical and experimental modal analysis results of generator end- winding. Using validated FE model, 3D electromagnetic model which computes the forces on the end-winding is coupled with a 3D mechanical model which calculates the dynamic displacement and stress under electromagnetic forces. These results will be used to evaluate reliability of end-winding and applied to update model.

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Response and Modal Analyses of Micro Double Cantilever Beams Interacted by Electrostatic Force (정전기력을 받는 마이크로 이중 외팔 보의 응답 및 모드 해석)

  • Jung, Kang-Sik;Moon, Seung-Jae;Yoo, Hong-Hee
    • Proceedings of the Korean Society for Noise and Vibration Engineering Conference
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    • 2004.11a
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    • pp.656-661
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    • 2004

  • Static and dynamic responses of micro double cantilever beam structures interacted by electrostatic forces are obtained employing Galerkin's method based on Euler beam theory. Variations of static and dynamic responses as well as natural frequencies are estimated for several sets of beam properties and applied voltages. It is shown that the variations of beam properties resulted by manufacturing process influence the deflections and the modal characteristics significantly. Such information can be usefully employed for the design of MEMS structures.

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여름을 이기는 힘

  • KOREA ASSOCIATION OF HEALTH PROMOTION
    • 건강소식
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    • v.31 no.7 s.344
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    • pp.28-29
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    • 2007

  • 땀을 많이 흘리는 여름에는 기력이 쇠해 입맛도 잃어버리기 십상이다. 하지만 입맛이 없을수록 먹는 것에 소홀해서는 안 될 것이다. 여름철 대표적인 보양 음식인 삼계탕과 잃어버린 입맛 찾아주는 밥반찬으로 가족들의 건강한 여름나기를 준비해 보자.

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