Abstract
To simplify the analysis of the three-dimension vibrations of reciprocating compressor crankshaft system under working conditions, a spatial finite element model based on 3-node Timoshenko beam was proposed in this paper. The crankshaft was idealized by a set of jointed structures consisting of simple round rods and simple beam blocks, the main journal bearings were idealized by a set of linear springs and dash-pots, and the flywheel and motor were idealized by a set of masses and moments of inertia. In practice, a FEM model of 6M51 reciprocating compressor crankshaft system was established using this method. And then the modal and forced vibration was calculated by ANSYS package.
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