Algorithm development for acoustic emission measurement in high-frequency ranges and its application on a large two-stroke marine diesel engine

Dong, Xuan; Nguyen, Manh Hung; Lee, Donchool

doi:10.1016/j.measurement.2020.107907

Cited by 6 publications

(2 citation statements)

References 16 publications

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“…Accurate real-time assessment of the engine status can help avoid lapses in operation by emergency shutdowns, major maintenance works, and catastrophic accidents, significantly saving cost and resources. Methods, such as vibration analysis, infrared thermography, ultrasound, acoustic emissions, etc., are commonly and regularly employed in this regard [1][2][3][4][5]. However, the detection of possible faults with these methods often involves complex data acquisition and assessment steps.…”

Section: Introductionmentioning

confidence: 99%

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

Liu

Raihan

et al. 2022

Energies

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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.

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Section: Introductionmentioning

confidence: 99%

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

Liu

Raihan

et al. 2022

Energies

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“…Many research works have found that the nonintrusive measurements can be utilized to monitor and diagnose the combustion process of ICEs. The measurements are mainly performed by using sensors of engine instantaneous speed, [4][5][6] acoustics, 7,8 and surface vibration. Among these indirect measurements, engine surface vibration contains rich information about the combustion process and has attracted wide attention.…”

Section: Introductionmentioning

confidence: 99%

Vibration analysis and combustion parameter evaluation of CI engine based on Fourier Decomposition Method

Wang

Yong

2021

International Journal of Engine Research

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As a non-intrusive method for engine working condition detection, the engine surface vibration contains rich information about the combustion process and has great potential for the closed-loop control of engines. However, the measured engine surface vibration signals are usually induced by combustion as well as non-combustion excitations and are difficult to be utilized directly. To evaluate some combustion parameters from engine surface vibration, the tests were carried out on a single-cylinder diesel engine and a new method called Fourier Decomposition Method (FDM) was used to extract combustion induced vibration. Simulated and test results verified the ability of the FDM for engine vibration analysis. Based on the extracted vibration signals, the methods for identifying start of combustion, location of maximum pressure rise rate, and location of peak pressure were proposed. The cycle-by-cycle analysis of the results show that the parameters identified based on vibration and in-cylinder pressure have the similar trends, and it suggests that the proposed FDM-based methods can be used for extracting combustion induced vibrations and identifying the combustion parameters.

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Acoustic Emission Investigation on an Electronically Controlled Two-Stroke Low-Speed Marine Diesel Engine: in Axial and Vertical Directions

Dong

Nguyen

2021

Acoust Aust

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Algorithm development for acoustic emission measurement in high-frequency ranges and its application on a large two-stroke marine diesel engine

Cited by 6 publications

References 16 publications

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

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

Vibration analysis and combustion parameter evaluation of CI engine based on Fourier Decomposition Method

Acoustic Emission Investigation on an Electronically Controlled Two-Stroke Low-Speed Marine Diesel Engine: in Axial and Vertical Directions

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