【摘要】 对基于主元分析方法的冷水机组传感器故障检测效率取决于训练数据和被测数据的质量的问题进行了研究.采用小波变换剔除测量数据中的噪声,提高数据质量,从而提高故障检测效率.结果表明:在-1.0℃故障下,基于小波去噪的主元分析方法的故障检测效率达到了91%.在同等数值的正负偏差故障下,基于小波去噪的主元分析方法的故障检测效率对称性更好.故障检测效率与小波基函数的分解层次关系密切.分解层次越多,故障检测效率越高.所有的db族小波基函数在5层分解的情况下,-0.5℃故障下的检测效率均能达到90%以上.更多还原

【Abstract】 Chiller sensor fault detection based on principal component analysis is a data-based analysis method.The fault detection efficiency relies on the quality of the training data and the measured data.The measurement noise was removed by wavelet transfer.The fault detection efficiencies were promoted because of the promotion of the data quality.Results show that the fault detection efficiency is 91% on the-1.0 ℃ introduced fault level by the PCA-based method combined with wavelet de-noising.On the same values of the positive and negative fault levels,the symmetry of the presented method is well than the normal PCA-based method.The fault detection efficiencies rely on the decomposed layer of the wavelet transfer.The more decomposed layers are,the well the fault detection efficiencies are.On the-0.5 ℃ fault level,the fault detection efficiencies of all the db′s wavelet function on the 5 layers decomposition are greater than 90%.更多还原