However, the problem how to select sample data in PCA model building has not been solved.The relationship between fault detectability of PCA model and standard deviation of sample data was derived.

• 通过推导主元模型的故障可检测性指标和建模数据样本的方差之间的解析关系，发现主元模型的故障可检测性随建模数据样本标准差的变大而提高。