基于集合经验模态分解和自回归滑动平均的某碾压混凝土重力坝变形预测模型及应用

Deformation Forecasting Model of RCC Gravity Dam and Its Application Based on Ensemble Empirical Mode Decomposition and Auto-Regressive Moving Average Model

为更精确地预测大坝变形数据,针对大坝变形监测序列的非线性和非平稳性问题,提出了一种结合集合经验模态分解和自回归滑动平均模型的大坝变形预测模型。首先利用集合经验模态分解法将非平稳的大坝变形监测数据分解为具有不同特征尺度的本征模态函数,然后分析各分量特征并分别建立自回归滑动平均模型,选择各自适合的最优模型参数,最后叠加各分量的预测结果作为最终的变形预测结果。分析结果表明,相较单一预测模型,结合集合经验模态分解和自回归滑动平均模型的组合预测模型的预测精度更高。

In order to better predict the dam deformation data and to overcome the deficiencies in monitoring and predicting non-stationary dam deformation series,a hybrid model of dam deformation forecasting based on ensemble empirical mode decomposition（EEMD）and auto-regressive moving average（ARMA）is proposed.Firstly,the dam deformation series is decomposed into a set of intrinsic mode function（IMF）with different characteristic scales by using EEMD.And then the ARMA forecasting model of each IMF is established with the optimal model parameters.Finally,the final forecasting result is obtained by superimposing the forecasting results of each component.Compared to single forecasting model,the simulation results demonstrate that the hybrid EEMD-ARMA model has higher prediction accuracy.