한국소음진동공학회:학술대회논문집 (Proceedings of the Korean Society for Noise and Vibration Engineering Conference)
- 한국소음진동공학회 2000년도 추계학술대회논문집
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- Pages.612-617
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- 2000
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- 1598-2548(pISSN)
저압 터빈용 Finger 형 블레이드의 공진 방지를 위한 개선 및 시험
Modification and Testing to Prevent the Resonance in a Finger-type Low Pressure Turbine Blade
- 발행 : 2000.11.16
초록
This paper describes the experience gained from the treatments for prevention of blade failure occurred in the low-pressure turbine. Some cracks due to high cycle fatigue were found at the blades in low-pressure turbines after long time operation. Such failure was mainly caused by the resonance of the blade with the vane passing frequency excitation. If a natural frequency of the blade exists near the excitation frequency, a resonant vibration can occur and leads to a large amount of stress which may cause fatigue failures in turbine blades. To avoid the resonance of the blade, some modifications have been performed and full-scaled mockup testing has been done to confirm the verification for modification. Test result shows that enlarging the span cover is very useful to change the natural frequency of the grouped blades effectively.
키워드