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The Monitoring Of Ship Propulsion By Torque And Rotational Speed Measurements On The Propeller Shaft

Morawski L., Szuca Z.

Journal of Polish CIMAC

2009

Vol. 4, no 1

105-110

In paper device for measuring of torque and rotational speed at the ship main drive propeller shaft transferred will be described.. This device connected to the power plant monitoring systemt. It may be used for continuous control of operating costs of the ship and for the choosing of safe and best engine operational parameters. It is possible to observe the actual point of engine's operational state marked against the mechanical characteristic chart. The limited, safe area of acceptable working points is displayed on the diagram as well. The presented torque meter has possibility to measure instantaneous fluctuations of the torque and engine rotational speed as a function of the shaft rotation angle. This is a piece of important diagnostic information for fast preliminary assessment of the load on a particular cylinder and of the quality of engine work.

The microprocessor device for measurements of torque and rotational speed on the propeller shaft of ship

Morawski L., Szuca Z.

Pomiary Automatyka Kontrola

2007

R. 53, nr 12

5-7

The paper presents the new model of torque meter designed in Gdynia Maritime University and Research-Production Enterprise for Maritime Industry "ENAMOR" Ltd., Gdynia. The general idea of measurement makes use of the torsion angle measured on a shaft section (400 mm) using the photo-optical technique. Torque meter unit is equipped with Programmable Logic Device (PLC) for calculations, external parameters acquisition (ex.: speed, trim, shaft generator power etc.) and measured data storage in memory. This unit (bearing a symbol ETNP-8) has also possibility to measure instantaneous fluctuations of the torque and engine rotational speed as a function of the shaft rotation angle. Displaying time-histories of those parameters on the monitor screen of an external PC computer gives the operator an opportunity to make a preliminary performance assessment for each individual cylinder in the engine, and for the drive system as a whole. As an example, the analysis and processing of the measured torque and rotational speed fluctuations are presented. The measurements were done on the training ship m/s Horyzont II, owned by the Gdynia Maritime University.

Referat przedstawia urządzenie do pomiaru momentu i prędkości kątowej na wale śruby, wykorzystujące fotooptyczny pomiar kąta skręcenia wału. Na podstawie mierzonych czasów trwania zębów i szczelin dwóch tarczy zębowych wyznaczana jest prędkość obrotowa, moment i moc na wale oraz teoretyczne zużycie paliwa. Dołączony do urządzenia zewnętrzny komputer PC, z odpowiednim oprogramowaniem umożliwia pomiar wartości chwilowych momentu i prędkości obrotowej w funkcji kąta położenia wału korbowego. Pomiary wartości chwilowych zawierają informację diagnostyczną o pracy układu napędowego statku.