The Optimization of Parallel Resonance Circuit for Wear Debris Detection by Adjusting Capacitance

Zhijian Liu, Sen Wu (), Mahmud Kamal Raihan, Diyu Zhu, Kezhen Yu, Feng Wang and Xinxiang Pan ()
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Zhijian Liu: College of Marine Engineering, Dalian Maritime University, Dalian 116026, China
Sen Wu: Research Institute, Xuzhou Construction Machinery Group Co., Ltd., Xuzhou 221004, China
Mahmud Kamal Raihan: Department of Mechanical Engineering, Clemson University, Clemson, SC 29634-0921, USA
Diyu Zhu: College of Marine Engineering, Dalian Maritime University, Dalian 116026, China
Kezhen Yu: College of Marine Engineering, Dalian Maritime University, Dalian 116026, China
Feng Wang: College of Marine Engineering, Dalian Maritime University, Dalian 116026, China
Xinxiang Pan: College of Marine Engineering, Dalian Maritime University, Dalian 116026, China

Energies, 2022, vol. 15, issue 19, 1-15

Abstract: Wear debris in lubrication oil provides important information for marine engine condition monitoring and faults diagnosis. Inductive sensors have been widely used to detect wear debris in lubrication oil. To improve the sensitivity, the inductive coil is always connected with a capacitor in parallel to form parallel LC resonance-sensing circuit. A previous study optimized the parallel resonance circuit by adjusting the excitation frequency. However, multiple parameters (namely, excitation signal, signal detection circuits, and signal-processing program, etc.) need to be adjusted accordingly for a series of the testing frequencies. To simplify the optimization, we propose a method based on adjusting the parallel capacitance in this work. The impedance (inductance and internal resistance) of the sensing coil and its variation induced by particles are first measured, which are the necessary parameters for establishing the function relationship between the parallel capacitance and the relative impedance variation. With the function relationship, the relative impedance variation is calculated directly, and the optimal capacitance is located at the highest absolute value of it. The experimental results for the ferrous and nonferrous particles match the calculation results well. Interestingly, the optimal capacitance for the nonferrous particle was larger than that of the ferrous particle. We speculate that the difference is generated due to the increased resistance induced by the eddy current effect.

Keywords: parallel resonance circuit; inductive sensor; wear debris detection; ferrous and nonferrous particle; optimization (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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