Vibration analysis is widely used for rotating machinery diagnostics; however measuring vibration of operational oil well pumps is\r\nnot possible.The pump�s driver�s current signatures may provide condition-related information without the need for an access to\r\nthe pump itself. This paper investigates the degree of relationship between the pump�s driver�s current signatures and its induced\r\nvibration. This relationship between the driver�s current signatures (DCS) and its vibration signatures (DVS) is studied by calculating\r\nmagnitude-squared coherence and phase coherence parameters at a certain frequency band using continuous wavelet transform\r\n(CWT). The CWT coherence-based technique allows better analysis of temporal evolution of the frequency content of dynamic\r\nsignals and areas in the time-frequency planewhere the two signals exhibit common power or consistent phase behaviour indicating\r\na relationship between the signals. This novel approach is validated by experimental data acquired from 3 kW petroleum pump�s\r\ndriver. Both vibration and current signatureswere acquired under different speed and load conditions.Theoutcomes of this research\r\nsuggest the use of DCS analysis as reliable and inexpensive condition monitoring tool, which could be implemented for oil pumps,\r\nreal-time monitoring associated with condition-based maintenance (CBM) program.
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