Publikationsdatum:
2020-05-14
Beschreibung:
The crankshaft dynamics model is of vital importance to a multitude of aspects on enginediagnostics; however, systematic investigations of such models performance (especially for largetwo-stroke diesel engines that are widely used in the power generation and shipping industries) havenot been reported in the literature. This study aims to cover this gap by systematically investigatingthe parameters that affect the performance of a two-stroke diesel engine crankshaft dynamics model,such as the numerical scheme as well as the engine components inertia and friction. Specifically, thefollowing alternatives are analysed: (a) two optimal performing numerical schemes, in particular,a stiff ordinary differential equations (ODE) solver and a fast solver based on a piecewise LinearTime-Invariant (LTI) scheme method, (b) the linear and the non-linear inertia-speed approaches,and (c) three engine friction submodels of varying complexity. All the potential combinations ofthe alternatives are investigated, and the crankshaft dynamics model performance is evaluated byemploying Key Performance Indicators (KPIs), which consider the results accuracy compared to themeasured data, the computational time, and the energy balance error. The results demonstrate that thebest performing combination includes the stiff ODE solver, the constant inertia-speed approach andthe most simplistic engine friction submodel. However, the LTI numerical scheme is recommendedfor applications that require fast response due to the significant savings in computational time withan acceptable compromise in the model results accuracy
Digitale ISSN:
1996-1073
Thema:
Energietechnik
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