The speed variation of the crankshaft may be easily and accurately measured using a shaft encoder and counting the pulses of the internal clock of the data acquisition system. If the crankshaft would be a rigid body, the variation of its angular speed could be directly correlated to the total gas-pressure torque. Actually, the variation of the crankshaft’s speed has a complex nature being influenced by the torsional stiffness of the cranks, the mass moments of inertia of the reciprocating masses and the average speed and load of the engine. Analyzing only the lower harmonic orders of the speed variation spectrum can filter out the distortions produced by the dynamic response of the crankshaft. The information carried by these harmonic orders permits to establish correlations between measurements and the average gas pressure torque of the engine, and to detect malfunctions and identify faulty cylinders.
The Frequency Analysis of the Crankshaft’s Speed Variation: A Reliable Tool for Diesel Engine Diagnosis
Contributed by the Internal Combustion Engine Division of THE AMERICAN SOCIETY OF MECHANICAL ENGINEERS for publication in the ASME JOURNAL OF ENGINEERING FOR GAS TURBINES AND POWER. Manuscript received by the ICE Division Feb. 9, 2000; final revision received by the ASME Headquarters Dec. 6, 2000. Associate Editor: D. Assanis.
- Views Icon Views
- Share Icon Share
- Cite Icon Cite
- Search Site
Taraza , D., Henein, N. A., and Bryzik, W. (December 6, 2000). "The Frequency Analysis of the Crankshaft’s Speed Variation: A Reliable Tool for Diesel Engine Diagnosis ." ASME. J. Eng. Gas Turbines Power. April 2001; 123(2): 428–432. https://doi.org/10.1115/1.1359479
Download citation file:
- Ris (Zotero)
- Reference Manager