究其原因，多为加工系统所存在的某些系统性和随机性误差。
The main reason of this is some system and trandom errors existing mainly in processing system.
利用此法，能计算结构静响应的均值和标准差，估价制造误差引起的结构力学性能的随机性误差。
We can use this method to calculate the mean values and standard deviations of the responses, and estimate the stochastic errors of structural characters resulting from the fabrication errors.
该模型有自组织和自学习的功能，可以根据每次学习误差的不同，不断调整学习速率，加速收敛过程，充分排除数据样本的随机性影响。
The network model can organize and study itself, according to different study error, continuously adjust the study rate, and accelerate refrain process, expel influence of the data sample.
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