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Estimating instantaneous internal combustion engine cylinder pressure using the manipulation of crankshaft vibrations | ||
| Engineering and Technology Journal | ||
| Article 1, Volume 26, Issue 3, 2008, Pages 62-80 PDF (1.01 M) | ||
| DOI: 10.30684/etj.26.3.10 | ||
| Authors | ||
| موفق علي توفيق; احسان عبد الحسين باقر | ||
| Abstract | ||
| This research summarized the possibility of prediction of the cylinder pressure (combustion pressure) of internal combustion engine by measuring the vibration amplitude at the housing of the main bearing of crankshaft. A mathematical model was developed using the Transfer Matrix Method to analyze the crankshaft vibration. The journal bearings were modeled as springs and dampers in the direction of main system coordinates. The bearings were under dynamic load conditions. This was achieved by sampling the crankshaft to multi-supported beam using the Equation of Three Moments Theory. A relation between the reactions were found at main bearings and the applied forces on the crankshaft as a result of pressure and the effect of both reciprocating and rotating motion . A computer program in Fortran language was developed for each cited sample. The study depends on experimental results previously measured on (Zetor MType), four stroke, 4-cylinders diesel engine under motoring condition using special prepared computer program. The resulting amplitude of vibration at local position were compared with the experimental amplitude also the cylinder pressure were corrected until a convergence criterion is reached between the theoretical and the experimental amplitudes. The instantaneous cylinder pressure will be predicted, two samples of data were taken for the amplitude of vibration at two rotational speeds. The results show good agreement with those obtained experimentally. Also the rotational speed was deduced by the use of practical measurement of vibration amplitude and cylinder pressure for two rotational speeds using the same program with simple change and showed good agreement between practical and theoretical results. | ||
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