根据服役结构的特点，提出了服役结构抗力的非平稳随机过程模型。
Based on the features of existing structure, the nonstationary random process model of resistance for existing structure is proposed.
ARIMA模型可以较准确地预测非稳态随机过程的时间序列。
ARIMA model can be used to predict the non stable time series with adequate precision.
当管制图中出现非随机性模型时，表示制程可能正处于管制外。
A control chart may indicate an out-of - control condition when some nonrandom patterns occur.
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