Development and calibration of a torsional engine model for a three-cylinder, two-stroke diesel engine

An experimental and analytical investigation was conducted to develop a calibrated torsional model of a three-cylinder, two-stroke diesel engine. A detroit Diesel 3-53 engine was instrumented for time resolved measurement of cylinder firing pressures and high resolution near instantaneous shaft speed using a 720 and a 3,600 count per revolution optical encoder. Data were taken for three spes and three torques for a total of nine conditions. A six degree- of-freedom torsional vibration model of the crankshaft, connecting rods, and pistons was developed. The nonlinear inertias, due to the reciprocating pistons, were included along with linear stiffness and damping. The equations of motion were numerically integrated over a cycle to obtain predicted response. The predicted response was compared to the measured response at the free end of the crankshafthttp://archive.org/details/developmentcalib00hudsU.S. Navy (U.S.N.) author.Lieutenant, United States NavyApproved for public release; distribution is unlimited