提出一种基于二次逼近模型的PID增益预测控制，并阐述了该系统的结构、算法和应用特点。
PID gain predictive control based on two approximation model is proposed for the problems of the traditional PID control and predictive control.
对原有指数平滑法进行市场预测，在此基础上建立了二次指数平滑法的预测模型，进而提出了三次指数平滑法的预测模型。
To make market prediction of former index, based on which build the prediction model of two dimension index and then bring about the prediction model of three dimension index.
计算获得了分离流、二次流和多尺度旋涡结构，表明SST模型能很好地预测尾水管内的湍流流动。
Finally, separation flow, secondary flow and multi-scale eddy structure are simulated, it indicates that SST model can give a good prediction of turbulence in the draft tube.
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