钢绞线液压提升装置在动水启闭中的抗振性能分析与试验研究

Anti-vibration performance analysis and experiment for the hydraulic lifting device with steel strand in the open and closed process in flowing water

针对动水闭门施工产生的复杂水力学和流激振动问题,以向家坝水电站导流底孔封堵闸门为研究对象,建立了闸门下放钢绞线装置数学模型,进行了系统弹性系数和阻尼系数的理论分析,确定了系统在简谐激励下的幅频响应特性和闸门在下放过程中影响钢绞线液压提升装置的优势频段范围。搭建了系统抗振试验系统,利用两台激振油缸带动钢绞线以一定的振幅和频率反复运行来模拟闸门的振动。通过振动模拟试验,验证了钢绞线液压提升装置在该振动频段下的可靠性。理论研究和试验验证结果表明,影响锚夹具夹紧性能的主要因素是钢绞线的有效长度,钢绞线液压提升装置可满足动水闭门操作要求;向家坝水电站导流底孔成功封堵施工也验证了该分析方法与模拟试验的正确性。

Aiming at the complex hydraulic problem and vibration problem induced by water flow,the sluice gate of diversion bottom tunnel of Xiangjiaba Hydropower Station was focused on. The mathematical model of hydraulic lifting device with steel strand was built. The elastic coefficient and damping coefficient were analyzed. The amplitude-frequency response and the preferential frequency range which would affect the hydraulic lifting equipment on steel wire in the process of putting down of gate were determined. The anti-vibration experiment system was built,and two cylinders were used to simulate the gate vibration under certain amplitude and frequency. The reliability of the hydraulic lifting device with steel strand was verified. The experimental results indicate that the effective length of the steel strand determines the clamping performance of the tendon anchorages. The lifting equipment could meet the construction requirements in flowing water by closed manner and the completion of construction of diversion tunnel plugging gate of Xiangjiaba Hydropower Station also confirms the validity of the analysis method and the simulated experiment.