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Flow meter fault isolation in building central chilling systems using wavelet analysis

机译:基于小波分析的建筑物中央制冷系统流量计故障隔离

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This paper presents an approach to isolate flow meter faults in building central chilling systems. It mathematically explains the fault collinearity among the flow meters in central chilling systems and points out that the sensor validation index (SVI) used in principal component analysis (PCA) is incapable of isolating flow meter faults due to the fault collinearity. The wavelet transform is used to isolate the flow meter faults as a substitute for the SVI of PCA. This approach can identify various variations in measuring signals, such as ramp, step, discontinuity etc., due to the good property of the wavelet in local time-frequency. Some examples are given to demonstrate its ability of fault isolation for the flow meters.
机译:本文提出了一种隔离建筑物中央冷却系统中流量计故障的方法。它在数学上解释了中央冷却系统中流量计之间的故障共线性,并指出由于故障共线性,主成分分析(PCA)中使用的传感器验证指标(SVI)无法隔离流量计故障。小波变换用于隔离流量计故障,以替代PCA的SVI。由于小波在局部时频上的良好特性,这种方法可以识别测量信号的各种变化,例如斜坡,阶跃,不连续性等。给出了一些示例以说明其对流量计进行故障隔离的能力。

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