水工闸门流激振动响应的一种计算方法

将作用在闸门上的水动力荷载分解为闸门无振动时的水流脉动压力和由于闸门振动引起的附加扰动流场所产生的动水压力两部分．用定义在频域上的相干函数来分析模型试验测得的脉动压力在各个节点之间的时空相关性，同时考虑脉动压力在不同频率分量上相关程度的不同，形成脉动水流的节点荷载，然后据随机振动理论建立模型试验和数值计算相结合的水工闸门流激振动响应计算方法，并以双口渡电站弧形闸门为例进行了算例分析．计算结果表明，该方法能够较好地满足工程分析的要求，并可以应用于其他水工建筑物的流激振动响应分析．

A computation method for flow-induced vibration response of gates

The pressures acting on the gate were divided into two parts: the fluctuating pressure of flow on the stationary gate and the hydrodynamic pressure due to gate vibration-induced additional disturbed flow. The temporal-spatial correlation of fluctuating pressures obtained by model experiments between different nodes was analyzed by the coherence function defined in frequency domain with consideration of different levels of correlation for different frequency components, and the nodal load of the fluctuating pressure could be obtained. Then, the computation method for flow-induced vibration response of gates with model experiment and numerical calculation combined together was developed based on the random vibration theory. As an example, the response of radial gate of Shuangkoudu hydropower station was analyzed. The result shows that the present method meets the requirement of engineering, and can be applied to flow-induced vibration analysis of other hydraulic structures.