Determination of top dead centre location based on the marine diesel engine indicator diagram analysis
1
Odessa National Maritime University
2
Danube institute of National university «Odessa maritime academy»
Submission date: 2019-10-18
Final revision date: 2020-01-08
Acceptance date: 2020-01-14
Online publication date: 2020-01-15
Publication date: 2020-01-15
Diagnostyka 2020;21(1):51–60
KEYWORDS
diesel enginetop dead centercylinder pressure monitoringmean indicated pressureship energy efficiency coefficient
TOPICS
ABSTRACT
The article discusses methods for determining top dead center, based on the analysis of pressure diagrams of a marine engine. The advantages and disadvantages of different methods are shown. Diagnostics of marine engines during operation and the selection of optimal operating conditions is based on the analysis of gas pressure diagrams. As a result of the analysis of the pressure diagrams, the indicator engine power is calculated, which is further used in the management of engine operation modes, in the calculation of specific indicators, as well as in the calculation of energy efficiency coefficients of marine vessels according to International Maritime Organization recommendations. The influence of the accuracy of determining the position of the top dead center on the calculation of the mean indicated pressure and indicator power is shown. The authors considered a method for determining top dead center, based on the solution of the equation P’= 0, which provides the required accuracy in calculating the mean indicated pressure and indicator power of the engine during operation. It is shown that the method can be applicable in marine engine working process monitoring systems as an alternative to hardware methods for determining the top dead center.
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