摘要
近几年来,国内外一些新投入运行的大型电站在稳定性运行方面遇到了不少问题,有的已经解决,有的则还没有找到问题的原因,影响了电站的稳定运行.三峡水电站2003年已有多台机组投入运行,其将来能否安全稳定运行是人们共同关心和担心的问题.
The measurement position on pressure fluctuation acceptance test of hydro turbines should be located close to the outlet of wicket gate, because this position is near the sensitive region of vibration and similarity between prototype and model is better than that of the position on draft tube. The frequency resolution factor of Fast Fourier Transform (FFT) analysis of pressure fluctuation wave is equal to the reciprocal value of the total sampling time. For the lower frequency range,prolonging sampling time will increase the analysis precision, while for the higher frequency range, increasing the sampling points and shortening sampling time will increase the analysis precision. The transducer should be located near the main flow passage. The measurement tube can not be made of elastic materials.
出处
《水利水电技术》
CSCD
北大核心
2003年第11期76-78,共3页
Water Resources and Hydropower Engineering
关键词
水轮机
压力脉动
频谱分析
快速付里叶变换
pressure fluctuation
spectrum analysis
Fast Fourier Transform (FFT)
