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Thermal Stress Analysis for Life Assessment of Small Steam Turbine Rotor (소형 기력발전용 터빈로터의 수명평가를 위한 열응력 해석)

  • 이진상;백운봉;윤기봉
    • Journal of Energy Engineering
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    • v.9 no.3
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    • pp.184-191
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    • 2000
  • 본 연구에서는 국내 10MW급 기력발전소의 소형 터빈 로터에 대한 응력 해석을 실시하였다. 터빈 로터의 기하학적 형상, 증기의 온도 및 압력 등의 기동조건 변화, 로터 재료의 온도에 따른 물성값 등을 고려하여 대류 열 전달계수를 계산하는 사용자 부프로그램을 구성하였으며, 이를 바탕으로 열해석을 실시하여 로터의 온도 분포를 결정하였다. 이 온도분포 조건에서 시간 경과에 따른 열응력 해석을 실시하여 로터의 응력 분포를 결정하였으며 그 결과 취약부위에서의 응력변동 범위 및 가동중 정상상태 응력수준을 결정하였다. 이 취약부위의 응력값과 운전이력을 이용하여 크리프 수명과 피로수명을 계산하고 로터의 잔여수명을 결정하는 방법을 논의하였다.

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Unbalance Response Analysis of Induction Motor Rotor Considering Unbalanced Electromagnetic Forces (불평형 전자기력을 고려한 유도전동기 회전자의 불평형 응답해석)

  • 손병구
    • Journal of Advanced Marine Engineering and Technology
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    • v.23 no.2
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    • pp.201-209
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    • 1999
  • This paper presents a general analytical method for analyzing mechanical unbalance response of unbalanced electromagnetic forces produced in induction motors with an eccentric rotor and a phase unbalance. The equations to be solved are a set of second order differential equations which give matrices with periodic coefficients that are a function of time due to the unbalanced electro-magnetic force. Unbalance response is processed by Newmark $\beta$ method. Two examples are given including an industrial application. The results show that the method proposed is satisfactory.

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Design of Magnetic Circuit with Minimum Leakage Using Response Surface Methodology (반응표면분석법을 이용한 자계누설 최소화 설계)

  • Park, Jin-Hun;Kwon, Jung-Hak;Hwang, Sang-Mun
    • Transactions of the Korean Society of Mechanical Engineers A
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    • v.34 no.1
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    • pp.27-33
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    • 2010
  • This paper focuses on the design of microspeakers with minimum flux leakage, for use in radiotelegraphy. The response surface methodology (RSM) is applied as the optimization technique for obtaining a large magnetic force and a small flux leakage on diaphragm. The object functions of this optimization are the magnetic force and the flux leakage along three factors; pole piece thickness, magnet grade and yoke thickness, which are determined by the design of the experiment. The magnetic force and the flux leakage are calculated for each condition and optimized by results evaluated with RSM. For a pole piece thickness of 0.9 mm, a magnet grade of N42H and a yoke thickness of 0.75 mm, the magnetic force is satisfied as initial model and flux leakage is decreased to 11.8% than initial model.