CAJ | 학술논문

高水头长引水隧洞电站在水力过渡过程中具有振荡周期长、振幅大、波动衰减周期长等特点，水轮机顶盖振动可以较好地反映该规律。本文依据真机试验，采用小波和小波包联合分析方法，对一大型电站变负荷振动试验中顶盖的振动响应测试信号进行了精细分频分析。结果表明：高水头长引水隧洞电站的水流脉动、尾水涡带和水击波频率较为接近，三者共同作用，导致顶盖强烈的振动响应；其中，水流脉动和尾水涡带是引起顶盖振动的最主要原因；同时也证明了小波和小波包联合分析方法是处理水电站振动信号的一种较好的方法。
고수두장인수수동전참재수력과도과정중구유진탕주기장、진폭대、파동쇠감주기장등특점，수륜궤정개진동가이교호지반영해규률。본문의거진궤시험，채용소파화소파포연합분석방법，대일대형전참변부하진동시험중정개적진동향응측시신호진행료정세분빈분석。결과표명：고수두장인수수동전참적수류맥동、미수와대화수격파빈솔교위접근，삼자공동작용，도치정개강렬적진동향응；기중，수류맥동화미수와대시인기정개진동적최주요원인；동시야증명료소파화소파포연합분석방법시처리수전참진동신호적일충교호적방법。
The hydropower stations with high water head and long diversion tunnel have some characteris-tics such as long period of oscillation , large oscillation range and slow -attenuation wave in the process of hydraulic transient .The vibration of Francis turbine's head cover can reflect these characteristics .Based on a hydropower station with high water head and long diversion tunnel , the paper described the vibration of its head cover with a combination method of wavelet and wavelet packet analysis .The results show that the strong vibration resonance of head cover results from the three factors such as flow pulsation , tail wa-ter vortex and water hammer ,for their frequencies are close in the hydropower station with high head and long diversion tunnel .Flow pulsation and tail water vortex are the most main factors which cause the vi-bration of head cover .This paper also proved that the method combing wavelet with wavelet packet is a better tool in the treatment of vibration signal of hydropower station .