Fault Detection in a Diesel Engine by Analysing the Instantaneous Angular Speed

Yang, Jianguo; Liao, Pu; Wang, Zhihua; Zhou, Yisu; Yan, Xinping

doi:10.1006/mssp.2000.1344

Cited by 105 publications

(47 citation statements)

References 4 publications

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“…Furthermore, the symmetrical N planet structure and periodically changing transmission path make fault diagnosis process based on vibration and acoustics very challenging. Instantaneous Angular Speed (IAS), which is one of the key parameters of machine dynamics, has been shown to have vital information for diagnosis and condition monitoring [1][2][3]. Compared to conventional vibration and acoustics signals, IAS is less affected by transmission path and non-cyclic stationary load, which can be suppressed by rotation domain average [1].…”

Section: Introductionmentioning

confidence: 99%

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Planetary gear fault diagnosis based on instantaneous angular speed analysis

Zeng

Mones

Shao

et al. 2017

2017 23rd International Conference on Automation and Computing (ICAC)

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Abstract-Planetary Gears (PG) are widely used in many important transmission systems such as helicopters and wind turbines due to its advantages of high power-weight ratio, self-centering and high transmission ratio. Vibration based condition monitoring of PG has received extensive researches for ensuring safe operations of these critical systems. However, due to the moving mesh gears and noise influences, the diagnostics of planet gear faults by conventional vibration measurements needs intensive signal processing but provides less satisfactory performance. This study investigates Instantaneous Angular Speed (IAS) based diagnostics which associates more directly with gear dynamics and is not influenced by the moving mesh gears. A pure torsional dynamic model of a PG is developed to gain the characteristics of IAS under different fault cases. Then experiments are performed to evaluate this IAS based diagnostics. Particularly, IAS signatures obtained by demodulating the frequency modulated pulse trains produced by two in-house made encoder wheels mounted at both the input and output of the PG. In addition, order spectrum analysis is applied to IAS signals to highlight fault components. IAS order spectra exhibit clear changes in the spectral amplitudes associating with different fault frequencies, showing consistent and efficient diagnostics. Besides, both the measurement system and signal processing computation for IAS based monitoring are more costeffective and easier to be implemented online, compared with conventional vibration based methods.

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Section: Introductionmentioning

confidence: 99%

“…Stander [1] built a simplified gear dynamic model with four degrees of freedom and found that tooth fault with meshing stiffness reduction result in IAS changes. Yang [2] and Li [3] etc. developed a dynamic model of diesel engines, and used IAS derived from the encoder to diagnose the faults related to combustion and gas pressure.…”

Section: Introductionmentioning

confidence: 99%

Planetary gear fault diagnosis based on instantaneous angular speed analysis

Zeng

Mones

Shao

et al. 2017

2017 23rd International Conference on Automation and Computing (ICAC)

View full text Add to dashboard Cite

show abstract

“…Prompted by the rapid development of data acquisition hardware and signal processing techniques over the last decade or two, a non intrusive instantaneous angular speed (IAS) measurement is gaining wide applications for condition monitoring and fault detection of rotating machinery. For instance, IAS technique was successfully employed for torsional vibration analysis [1, 2], condition monitoring of gear transmission [2][3][4][5], condition monitoring and fault detection of diesel engines [6][7][8][9], condition monitoring of electric motors [10] and roller bearing fault detection [11]. Instantaneous angular speed (IAS) technique can also be employed for monitoring engine performance as the variation of crank angular speed is directly correlated to the total gas pressure torque produced by the engine combustion process.…”

Section: Introductionmentioning

confidence: 99%

“…In the application of IAS for fault detection and diagnosis of diesel engines, Yang et al [6] presented a simple two-degree of freedom dynamic system for the simulation of instantaneous angular speed fluctuation of a four-stroke four-cylinder diesel engine. They found that the instantaneous angular speed is largely affected by the tangential force induced by the gas pressure and the vertical imbalance inertial force induced by piston acceleration/deceleration of all the cylinders.…”

Section: Introductionmentioning

confidence: 99%

Estimating the Loading Condition of a Diesel Engine Using Instantaneous Angular Speed Analysis

Lin

Tan

et al. 2013

Lecture Notes in Mechanical Engineering

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Continuing monitoring of diesel engine performance is critical for early detection of fault developments in the engine before they materialize and become a functional failure. Instantaneous crank angular speed (IAS) analysis is one of a few non intrusive condition monitoring techniques that can be utilized for such tasks. In this experimental study, IAS analysis was employed to estimate the loading condition of a 4-stroke 4-cylinder diesel engine in a laboratory condition. It was shown that IAS analysis can provide useful information about engine speed variation caused by the changing piston momentum and crankshaft acceleration during the engine combustion process. It was also found that the major order component of the IAS spectrum directly associated with the engine firing frequency (at twice the mean shaft revolution speed) can be utilized to estimate the engine loading condition regardless of whether the engine is operating at normal running conditions or in a simulated faulty injector case. The amplitude of this order component follows a clear exponential curve as the loading condition changes. A mathematical relationship was established for the estimation of the engine power output based on the amplitude of the major order component of the measured IAS spectrum.

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“…Balancing the cylinder-wise torque contributions of automotive and other high-speed engines was addressed by reconstructing the cylinder-wise net indicated torques [14][15][16] by direct use of the angular acceleration [17,18] or by reconstructing only the relative torque contributions of the cylinders [19]. Taraza et al [8] suggested a method where the measured angular speed was directly related to the nonuniform torque contribution.…”

Section: Introductionmentioning

confidence: 99%

Power Balancing of Inline Multicylinder Diesel Engine

Gawande

Navale

Nandgaonkar³

2012

Advances in Mechanical Engineering

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In this work, a simplified methodology is presented for power balancing by reducing the amplitude of engine speed variation, which result in excessive torsional vibrations of the crankshaft of inline six-cylinder diesel engine. In modern fuel injection systems for reciprocating engines, nonuniform cylinder-wise torque contribution is a common problem due to nonuniform fuel supply due to a defect in fuel injection system, causing increased torsional vibration levels of the crankshaft and stress of mechanical parts. In this paper, a mathematical model for the required fuel adjustment by using amplitude of engine speed variation applied on the flywheel based on engine dynamics is suggested. From the found empirical relations and FFT analysis, the amplitude of engine speed variation (i.e., torsional vibration levels) of the crankshaft of inline six-cylinder diesel engine genset can be reduced up to 55%. This proposed methodology is simulated by developing MATALB code for uniform and nonuniform working of direct injection diesel engine of SL90 type manufactured by Kirloskar

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Fault Detection in a Diesel Engine by Analysing the Instantaneous Angular Speed

Cited by 105 publications

References 4 publications

Planetary gear fault diagnosis based on instantaneous angular speed analysis

Planetary gear fault diagnosis based on instantaneous angular speed analysis

Estimating the Loading Condition of a Diesel Engine Using Instantaneous Angular Speed Analysis

Power Balancing of Inline Multicylinder Diesel Engine

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