In the present study a non-linear dynamic model of the compressor is developed to predict the entire motion of the compressor. The motion is described in terms of three linear positional coordinates (X, Y, Z), four Euler Parameters (θ_0, θ_1, θ_2, θ_3) and the position of the crankshaft β. The model has seven degrees of freedom since the four Euler Parameters are related by a single equation. A computer program is prepared for simulation of the motion. The crankshaft speed of rotation and the time response of the compressor unit during transient and steady state motion are predicted. The model is initially tested in a limited experiment to predict the peak displacements of the compressor body in three directions and good agreement was observed.
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