A Modified Rotor Model to Approach the Dynamic Responses of Anisotropic Rotor with Different Shaft Orientation

Malta, jhon (2013) A Modified Rotor Model to Approach the Dynamic Responses of Anisotropic Rotor with Different Shaft Orientation. Proceeding of Quality in Research. pp. 91-96. ISSN 1411-1284

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Abstract

This research deals with a modification of anisotropic rotor model in order to approach the experimental dynamic responses of anisotropic rotor. The prototype of an anisotropic rotor with two disks is supported by four quasi-rigid bearings. In the experimental studies, the dynamic responses of disks are recorded in horizontal and vertical directions at constant angular speed from 1 to 80 Hz with an incremental speed of 1 Hz. In the numerical studies, two mathematical models are developed by using a minimal number of discrete elements. The dynamic responses of the models are solved by using the Runge-Kutta method of fourth order. In the first model, the mass of shaft is negligible. In the second model, the mass of shaft is taken into account. Comparing the numerical and the experimental analyses, the numerical natural frequencies of the first model is rather higher than the experimental natural frequencies. The better results which closed to the experimental natural frequencies are obtained in the second rotor model, whereas the mass of shaft contributes to reduce the natural frequencies. In the other results, the dynamic responses of the rotor both in simulation and in experiment show the instability area in a wide range.

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