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Nonlinear dynamics of multy-disc rotor in dry friction bearings,

In this paper the FEM is used for calculating the transient response of horizontal multi-disc rotor supported by two dry friction bearings. The nonlinearity in numerical simulation is introduced on the basis of contact force theory through the deformation vector at contact point. The nonlinear system of differential equations is solved by using modificated Newmark integration scheme associated with the HHT alpha method. The results of calculations are compared for rotors with different radial clearances. Detailed results are given in the form of diagrams of displacement amplitude in horizontal and vertical direction as well as in the forms of whirl orbits. Also the diagrams of contact angle and normal contact force in the contact point are given. Results of numerical model are compared with experimental results obtained on the test rig during the rotor's run down.

nonlinear dynamics; dry friction bearings; HHT alpha method

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