http://chineseinput.net/에서 pinyin(병음)방식으로 중국어를 변환할 수 있습니다.
변환된 중국어를 복사하여 사용하시면 됩니다.
개별검색 DB통합검색이 안되는 DB는 DB아이콘을 클릭하여 이용하실 수 있습니다.
통계정보 및 조사
예술 / 패션
<해외전자자료 이용권한 안내>
- 이용 대상 : RISS의 모든 해외전자자료는 교수, 강사, 대학(원)생, 연구원, 대학직원에 한하여(로그인 필수) 이용 가능
- 구독대학 소속 이용자: RISS 해외전자자료 통합검색 및 등록된 대학IP 대역 내에서 24시간 무료 이용
- 미구독대학 소속 이용자: RISS 해외전자자료 통합검색을 통한 오후 4시~익일 오전 9시 무료 이용
※ 단, EBSCO ASC/BSC(오후 5시~익일 오전 9시 무료 이용)
Shrouded impeller consisting of a cover attached to top of the blades has complicated irregular cross sections. The blades distribute its centrifugal load into the wheel and fillet area in a very non-uniform manner which depends upon its own pattern of deflection of the disk along its interface. Therefore, full 3D structural analysis should be performed in order to calculate von-mises stresses and compared with its allowable stresses at certain sections. Additionally, to determine dynamic characteristics of the impeller, a modal analysis was performed. Vibration characteristics of the impeller must be investigated in detail to prevent high cycle fatigue and rubbing due to interaction of impeller blade tips with stationary inlet as a result of excessive vibration. Subsequently, Campbell diagram was constructed to ensure there's no resonant failures up to 34k harmonics. According to results, stress safety margins are below criteria and none of the impeller frequencies intersect with 1~12k engine order for the operational range of impeller speed at 12,840 rpm.
Doosan has been developing a 5MW class gas turbine engine, DGT-5. Campbell diagram has been used for prediction of possible occurrence of resonances of rotating machinery. The Campbell diagram consists of blade natural frequency and excitation frequency. In this paper, modal characteristics of compressor and turbine blades are investigated and Campbell diagram is obtained. We calculated compressor and turbine blade's natural frequency using ANSYS tool. The result has been verified through test.
The exact load measurements for the mechanical parts of wind turbine are important step both for evaluation of specific wind turbine design and for a certification process. A wind turbine monitoring system is essential equipment for mechanical load analysis of a wind turbine. This monitoring system is based on IEC 61400-13 and strain gage are used to measure a mechanical load of wind turbine. Also this system monitors signals from a meteorological mast. The measured signals which are sampled at 200 Hz are automatically saved on a data file in the unit of ten minutes. A detail explanation for the developed wind turbine monitoring system is presented in this study.