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Engine Malfunctioning Conditions Identification through Instantaneous Crankshaft Torque Measurement Analysis

Tsitsilonis, K-M and Theotokatos, G (2021) Engine Malfunctioning Conditions Identification through Instantaneous Crankshaft Torque Measurement Analysis. Applied Sciences, 11 (8). ISSN 2076-3417

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Open Access URL: https://doi.org/10.3390/app11083522 (Published version)


In this study a coupled thermodynamics and crankshaft dynamics model of a large two-stroke diesel engine was utilised, to map the relationship of the engine Instantaneous Crankshaft Torque (ICT) with the following frequently occurring malfunctioning conditions: (a) change in Start of Injection (SOI), (b) change in Rate of Heat Release (RHR), (c) change in scavenge air pressure, and (d) blowby. This was performed using frequency analysis on the engine ICT, which was obtained through a series of parametric runs of the coupled engine model, under the various malfunctioning and healthy operating conditions. This process demonstrated that engine ICT can be successfully utilised to identify the distinct effects of malfunctions (c) or (d), as they occur individually in any cylinder. Furthermore by using the same process, malfunctions (a) and (b) can be identified as they occur individually for any cylinder, however there is no distinct effect on the engine ICT among these malfunctions, since their effect on the in-cylinder pressure is similar. As a result, this study demonstrates the usefulness of the engine ICT as a non-intrusive diagnostic measurement, as well as the benefits of malfunctioning conditions mapping, which allows for quick and less resource intensive identification of engine malfunctions.

Item Type: Article
Uncontrolled Keywords: Chemistry; Chemistry, Multidisciplinary; crankshaft dynamics model; degradation; diagnostics; engine harmonic frequencies; Engineering; Engineering, Multidisciplinary; frequency analysis; instantaneous crankshaft torque; malfunctioning conditions mapping; MARINE DIESEL-ENGINES; Materials Science; Materials Science, Multidisciplinary; MODEL; PERFORMANCE; Physical Sciences; Physics; Physics, Applied; PROPULSION; Science & Technology; Technology; thermodynamics model; two-stroke diesel engine; Science & Technology; Physical Sciences; Technology; Chemistry, Multidisciplinary; Engineering, Multidisciplinary; Materials Science, Multidisciplinary; Physics, Applied; Chemistry; Engineering; Materials Science; Physics; instantaneous crankshaft torque; frequency analysis; two-stroke diesel engine; engine harmonic frequencies; malfunctioning conditions mapping; thermodynamics model; crankshaft dynamics model; degradation; diagnostics; MARINE DIESEL-ENGINES; PERFORMANCE; PROPULSION; MODEL
Subjects: T Technology > TA Engineering (General). Civil engineering (General)
V Naval Science > VM Naval architecture. Shipbuilding. Marine engineering
Divisions: Engineering
Publisher: MDPI AG
SWORD Depositor: A Symplectic
Date Deposited: 15 Dec 2022 11:08
Last Modified: 15 Dec 2022 11:15
DOI or ID number: 10.3390/app11083522
URI: https://researchonline.ljmu.ac.uk/id/eprint/18410
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