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This paper presents a quasi-steady model of vibrations of two cylinders in a side-by-sidearrangement. The cylinders have flexible support and equal diameters. The model asumes that bothmovement of cylinders is described by a set of four non-linear differential equations. These equations areevaluated on the basis of a numerical simulation and experimental data. Moreover many features ofcylinder vibrations are found from numerical results and are described in this paper.