Agricultural Engineering, Volume 46

APPLICABILITY STUDY OF THE FIBER-OPTIC GYRO IN PISTON ENGINES DIAGNOSING PROCESS

Tomasz Lus, Marek Łutowicz, Dominika Cuper
Polish Naval Academy

Abstract

The Polish Naval Academy has been involved in marine reciprocating combustion engines indication tests for many years. Results of researches aiming to diagnostic using of measurement of engine crankshaft unsteady angular speed are presented in the paper. Up to now, adequate accuracy of angular speed measurement had not been achieved to make proper diagnostic decision. Commercially, measurement of unsteady rotation speed has been used only in MAPEX –TV system (Torsional Vibration detector) dedicated to SULZER engines, which can detect only the one engine cylinder switch out of work without any mistakes. For several years, mostly in navigation, more often are used optic gyroscopes which work on the base of Sagnac effect, assuring angular speed measurements with resolution of 0.001o/h. Such resolution is too high than needed in piston engines diagnostic, but range of measured rotation speed is much much lower than rpm of medium- or low-speed marine diesel engines. In scope of conducted research it was decided to build a model of Sagnac interferometer prepared to measure of instantaneous angular speed in range adequate to medium speed marine diesel engines. At rotational crankshaft speed equal 750 rpm 1mV change in output voltage had been achieved for the difference of 0,4 o/sec of rotational speed. Time of measurement is equal the time which need light ray to go through distance of 100 m fibber-optic line. In practice this method do not introduce any significant phase shifts and does not limit the number of samples per revolution.

Keyword(s): Piston engine, indicating, rotational speed accuracy, diagnostics.


References

Łutowicz M.: unsteady angular speed of diesel engine crankshaft preliminary examination, 38th International Scientific Congress on Powertrain and Transport Means European KONES 2012, Journal of KONES POWERTRAIN AND TRANSPORT 20112 Vol.19, No4, 393-399,WARSAW 2012.

Morawski L., Sikora M., Application of the photo optic torquemeter to estimation of torque and rotational speed fluctuations on the propeller shaft of ship, 6th Slovak and Czech Conference SENSOR and SENSOR SYSTEM ’97, Kosice-Presov 1997.

Piętak A., Borkowski W., Analiza pomiarów prędkości obrotowej i obliczeń przyspieszeń kątowych wału korbowego do celów diagnostycznych, SILWOJ’99, Jurata 1999.

Praca Zbiorowa, Indykowanie silników, AVL, 2004.

Wajand J. Pomiary szybkozmiennych ciśnień w maszynach tłokowych. Warszawa: Wydawnictwa Naukowo-Techniczne 1974.


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DOI: http://dx.doi.org/10.15544/ageng.2014.004

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Agricultural Engineering ISSN 1392-1134 / eISSN 2345-0371

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