Fan fault diagnosis based on symmetrized dot pattern analysis and image matching

•Symmetrized dot pattern analysis is used to extract features of vibration signals.•The image matching is used to diagnose the faults.•Single, multiple and clustering fault templates are used to perform image matching.

To detect the mechanical failure of fans, a new diagnostic method based on the symmetrized dot pattern (SDP) analysis and image matching is proposed. Vibration signals of 13 kinds of running states are acquired on a centrifugal fan test bed and reconstructed by the SDP technique. The SDP pattern templates of each running state are established. An image matching method is performed to diagnose the fault. In order to improve the diagnostic accuracy, the single template, multiple templates and clustering fault templates are used to perform the image matching.