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Determination of top dead centre location based on the marine diesel engine indicator diagram analysis

Varbanets Roman, Zalozh Vitalii, Shakhov Anatoliy, Savelieva Iryna, Piterska Varvara

Diagnostyka

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2020

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Vol. 21, No. 1

51--60

EN

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 well as fuel supply and gas distribution 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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Marine diesels working cycle monitoring on the base of IMES GmbH pressure sensors data

Neumann Stefan, Varbanets Roman, Kyrylash Olena, Maulevych Vladyslav, Yeryganov Oleksiy

Diagnostyka

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2019

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Vol. 20, No. 2

21--26

EN

The paper presents algorithms for marine diesel engines’ working process monitoring designed by analyzing data obtained with IMES pressure sensors. Main features and properties of IMES sensors, used for 2- and 4-stroke modern marine diesel engines, are presented here. The pressure-time diagrams were taken as a basis for creating algorithms for marine diesel engines’ working process monitoring. The task of preliminary calculation of top dead center position (TDC) of a cylinder was solved using polytropic compression equation. TDC position was calculated using the equation P' = 0. Then algorithm for calculating the average indicator pressure and the indicator power of the cylinder has been determined. The CFD methods show how indicator valve channel influences the results of marine diesel engines’ working process monitoring. With the example of compression curves in a cylinder, it’s shown amplitude and phase distortions introduced into pressure measurements by the indicator valve channel. Such research work is important and actual in time due to the use of marine diesel portable performance analysis systems.

3

Project of an TDC signal distributor prototype with galvanic separation destined for studies of the beginning of selfignition using Langmuir probe

Rudnicki J., Piechowski L.

Journal of Polish CIMAC

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2014

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Vol. 9, no 2

173--183

EN

The knowledge of pistons' TDC is crucial while performing any kind of measurement beneficial to diagnostic inference of a diesel engine. The research of engines under exploitation often cause impartial difficulties with, eg. capability of probe installation. Therefore, it becomes crucial to minimalize those. The paper presents a description of a TDC impulse distributor - divider that provides signal delivery to more than one measurement system used during the research (here -cylinder indication system and Langmuir probe system). The necessity of galvanic separation of signals was justified and detailed, electronic schematic diagrams of two Solutions of TDC signals distributors were presented. Those are systems with two and four independent output. The distributor's system with two outputs was realized in practice as a prototype used during measurements performed on diesel engines. Alternative possibilities of manufacturing any kind of distributor, according to user's needs, were presented.