Abstract
The purpose of this study is to develop a procedure for carrying out analysis on torsional vibration of a mechanical system including piston-crank systems such as a reciprocating compressor. In the formulation, we first derived variable moment of inertia of a piston-crank system about the crankshaft through revolution of the crank. We adopted the mechanical system consisting of a motor, a fly wheel and multiple piston-crank systems as an analysis model. We also derived equations of motion using the derived variable moment of inertia of a piston-crank system and considering the boundary conditions that both ends of the crankshaft are free. The program for eigenvalue analysis and the one for time history responses were developed according to the formulation. The dynamic characteristics of a model system consisting of a motor, a fly wheel and two piston-crank systems were investigated by performing eigenvalue analysis. The time history responses on torsional vibration of the crankshafts of the model system were also calculated.
