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为研究乌江思林水电站溢流坝弧形工作闸门可能出现的闸门流激振动问题,通过制作几何比尺为1/35的完全水弹性模型进行流激振动试验,研究该闸门在有止水和无止水2种工况下的静动力特性及不同开度的动力响应,提出了该闸门安全运行的合理化建议.检测采用电测法,共进行静力试验2组,动力试验16组.静力试验结果表明该闸门结构设计合理,结构强度满足规范要求.动力试验结果表明结构的自振频率范围避开了水流脉动压力的高能区,正常运行情况下(止水良好)产生强烈振动的可能性不大,结构加速度最大值为0.228g,动应力最大值为0.92 MPa,各测点动力系数小于1.08,动力响应满足闸门抗振设计要求.闸门振动不利开度为0.6H和0.7H左右(H为水头).在漏水工况下运行时闸门振动加剧.
In order to study the possible gate flow vibration problem of the overflow gate of the overflow dam of Wujiang Silin Hydropower Station, a full hydroelastic model with a geometric scale of 1/35 was used to conduct the flow-induced vibration test. Static and dynamic characteristics under different working conditions and dynamic response of different opening degree are put forward, and reasonable suggestions are put forward for the safety operation of the gate.The electrical test method is adopted in the test, two groups of static tests and 16 dynamic tests The results of the force test show that the gate structure is reasonable in design and the structural strength meets the requirements of the standard.The dynamic test results show that the natural frequency range of the structure avoids the high energy area of the pressure pulsating pressure and may produce strong vibration under normal operation The maximum value of structural acceleration is 0.228g, the maximum value of dynamic stress is 0.92 MPa, the dynamic coefficient of each measuring point is less than 1.08, and the dynamic response meets the requirements of anti-vibration design of gate. The unfavorable degree of gate vibration is 0.6H and 0.7H H for the head.) Gates are agitated during run-time conditions.