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1

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.

2

Marine diesel engine – a novel approach of indicated power determination and related uncertainty level

Kowalak P., Żmudzki S., Borkowski T.

Combustion Engines

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2017

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R. 56, nr 1

15--20

EN

A proposal of a new method for marine engine indicated power determination, based on direct piston position, instead of crankshaft angular position measurement, was presented. With the aid of bond graph theory, it was proved, that the new method is equivalent to conventional method. To verify hypothesis, that the new method has potential of determined indicated power uncertainty reduction, simulated calculations were carried out. Results of calculations for two marine diesel engines: medium-speed, four stroke and slowspeed two stroke type, at assumption of engine crankshaft constant speed, were compared with results obtained by a conventional method. Data, collected by means of a typical portable, industrial, digital indicator on engines in service, were used for simulation. The uncertainties of engines indicated power determined by means of two methods were analysed. The indicated power uncertainty, achieved for conventional method, was nearly twice higher than for new proposed method. Finally, uncertainty structure was analysed and evaluated for both: new and conventional method of engine indicated power determination.

3

Marine engine indicated power uncertainty determination

Kowalak P.

Combustion Engines

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2015

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R. 54, nr 2

3--13

EN

A proposal of marine engine indicated power uncertainty evaluation method was presented. The uncertainties of the indicated power definitional formula components were evaluated. Methods of uncertainty estimation for measurement carried out in industrial conditions were proposed. A new component called a phase shift angle, in modified formula for the piston kinetic was introduced. The indicated power uncertainty was divided into two calculable parts called uncertainty category I and uncertainty category II. The results of the uncertainties determined for two marine engines: trunk piston and cross-head type were presented. The influence of the individual component of indicated power formula for the overall indicated power uncertainty value was shown.

PL

Zaprezentowano propozycję metody oceny niepewności mocy indykowanej silnika okrętowego. Określono niepewności składników definicyjnego równania mocy indykowanej. Przedstawiono metody szacowania niepewności dla pomiarów przeprowadzonych w warunkach przemysłowych. W zmodyfikowanym równaniu ruchu tłoka wprowadzono nową wielkość fizyczną określoną jako kąt przesunięcia fazowego. Zaproponowano także podział niepewności mocy indykowanej na dwie obliczalne części, nazwane niepewnością rodzaju I oraz niepewnością rodzaju II. Przedstawiono wyniki niepewności wyznaczonych dla dwóch silników okrętowych: wodzikowego i bezwodzikowego. Zaprezentowano wpływ poszczególnych składników równania mocy indykowanej na wartość jej całkowitej niepewności.

4

Moc indykowana tłokowej sprężarki chłodniczej

Dudar A.

Zeszyty Naukowe Politechniki Białostockiej. Budowa i Eksploatacja Maszyn

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2003

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Z. 11

49-59

PL

W niniejszej pracy przedstawiono jedną z metod pomiaru mocy indykowanej tłokowej sprężarki chłodniczej. Stanowisko eksperymentalne zostało zbudowane w oparciu o agregat skraplający WF 180. Stosowne pomiary pozwalają określić parametry pracy badanej sprężarki oraz jej stan techniczny. Metoda badawcza opiera się na pomiarze ciśnienia w cylindrze sprężarki w funkcji kąta obrotu wału korbowego. Do pomiaru ciśnienia wykorzystano tensometryczny przetwornik ciśnienia własnej konstrukcji, natomiast do określenia położenia tłoka zastosowano układ kontaktron - magnes. Układ pomiarowy został zbudowany przy wykorzystaniu rejestratora MC201 oraz komputera PC. Stanowisko badawcze jest obecnie w wyposażeniu Laboratorium Chłodnictwa w Katedrze Termodynamiki i Mechaniki Płynów na Wydziale Mechanicznym Politechniki Białostockiej.

EN

A method of measurement of indicated power of refrigerating piston compressor has been presented in this work. The proper experimental test stand became built basing on the condensation unit of WF 180. Appropriate measurements permit determination of operational parameters of tested compressor as well as their technical state. Investigative method is strictly connected with measurement of pressure in cylinder of compressor as a function of crank angle. Measurement of pressure has been realized with use of the own extensometer's pressure converter, while piston position has been determined by means of contracton - magnet arrangement. Measurement system became executed with utilization of MC201 recorder as well as proper PC computer. At present, the demonstrated stand is on equipment of Laboratory of Refrigerating Engineering at Chair of Thermodynamics and Mechanics of Fluids on Mechanical Department of Technological University of Białystok.