But the complexity of the problem, the indefinite of the factors and especially the limits of the predicting method made large error between the prediction value and the reality.
但由于问题本身的复杂性、影响因素的不确切性、特别是预测方法的局限性，使得目前需水预测误差较大。
The prediction value tallied with the actual drilling result, and the average error was 11%.
预测与实钻结果吻合较好，实钻误差平均为11%。
The experimental results show that the absolute value of mean error of such prediction and control precision is within 5% , which gets good effect on sheet shape control. The BP network m…
仿真与实验结果表明：该模型预测和控制板形精度的平均误差绝对值均在5％之内，具有较好的效果，可应用于板形在线预测与控制。
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