基于混沌理论的弧形闸门支臂振动特性

Vibration Characteristics of Radial Gate Arm Based on Chaos Theory

为了研究弧形闸门支臂的振动问题,采用混沌理论对时间序列进行处理,确定延迟时间τ、嵌入维数m进行相空间重构,并计算时间序列的混沌特征值,进而研究弧形闸门在启闭过程中振动的复杂性。以某水电站弧形闸门支臂振动为研究对象,根据支臂振动加速度原型观测资料,分析不同开度的振动情况,发现启门振动的复杂程度高于闭门工况,小开度的振动复杂程度更高,且支臂振动的复杂程度为与面板连接位置最大,与闸墩连接位置最小,中间位置介于前两者之间。为弧形闸门短期振动预测提供了支持。

This paper is to research the vibration problem of the radial gate arms.The chaos theory was used to handle the time series.The delay timeτand embedding dimension m were adopted to implement the phase space reconstruction.And then the chaotic eigenvalue of the time series was calculate to study the complexity of the vibration of radial gate in the opening and closing process.Taking the vibration of a radial gate arms of a hydropower station as the research object,according to the prototype observation data of the arm vibration accelerations,the vibration at different opening degrees was analyzed.It founds that the vibration during opening is more complicated than that of closing process.The complexity of vibration is higher in small openings.The vibration complexity of the arm in the connection positions with the panel is the largest,the connection positions with the pier is the smallest,and the intermediate position is between the former two.This results can provide support for short-term vibration prediction of radial gates.