A COMPUTATIONAL ANALYSIS OF THE STEADY STATE LATERAL VIBRATION OF A FLEXIBLY SUPPORTED RIGID UNBALANCED ROTOR ATTENUATED BY SQUEEZING THE THIN FILMS OF CLASSICAL AND MAGNETORHEOLOGICAL LIQUIDS

Abstract eng:
The vibration amplitude of rotors excited by imbalance can be significantly reduced if damping devices are inserted between the rotor and its stationary part. To achieve their optimum performance, the damping effect must be controllable. For this purpose a new semiactive damping element has been proposed. It works on the principle of squeezing two concentric lubricating films formed by classical and magnetorheological liquids. In the mathematical model they are represented by newtonian and Bingham materials respectively. The damping effect is controlled by the change of intensity of the magnetic field generated by electric current. The rotor is assumed to be absolutely rigid and is coupled with the stationary part by spring elements. Its vibration is governed by nonlinear equations of motion whose steady state solution is obtained by application of a collocation method. The newly proposed semiactive damping element minimizes amplitude of the rotor vibration by adapting the damping effect to the current operating conditions.

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