Estimating the loading condition of a diesel engine using instantaneous angular speed analysis

Lin, Tian Ran, Tan, Andy C. C., Ma, Lin, & Mathew, Joseph (2011) Estimating the loading condition of a diesel engine using instantaneous angular speed analysis. In Lee, Jay (Ed.) Proceedings of the 6th World Congress on Engineering Asset Management, Springer, Duke Energy Center, Cincinatti, Ohio. (In Press)

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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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ID Code: 46608
Item Type: Conference Paper
Refereed: Yes
Keywords: Condition monitoring, Instantaneous angular speed analysis, Order analysis, Diesel engine performance
Subjects: Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > AUTOMOTIVE ENGINEERING (090200)
Australian and New Zealand Standard Research Classification > ENGINEERING (090000) > MECHANICAL ENGINEERING (091300)
Divisions: Current > Research Centres > CRC Integrated Engineering Asset Management (CIEAM)
Past > QUT Faculties & Divisions > Faculty of Built Environment and Engineering
Past > Schools > School of Engineering Systems
Copyright Owner: Copyright 2011 [please consult the author]
Deposited On: 26 Oct 2011 01:35
Last Modified: 26 Oct 2011 01:35

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