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Critical Speed of Hyperbolic Disks and Eccentricity Effects on The Stability of The Rotor Bearing System | ||
| Engineering and Technology Journal | ||
| Article 1, Volume 25, Issue 8, 2007, Pages 998-1011 PDF (198.59 K) | ||
| DOI: 10.30684/etj.25.8.8 | ||
| Author | ||
| Muhannad Zedan Khalifa | ||
| Abstract | ||
| The critical speed of hyperbolic disks for the selected model is calculated in three different cases, anisotropic material and thermal case, isotropic material and thermal case finally isotropic material and thermal with generated heat case. The second case is found to be the best because the critical speed occurs above maximum speed values. For recognition of the eccentricity (e) effects on the stability, the original bearings of the selected model were tilting pads bearing replaced by adjustable hydrodynamic pads bearing. The results proved that stability criteria (Sc), critical mass (Mc), whirling frequency ratio ( - 2 fn ) of variable rotational speed of the adjustable hydrodynamic pads bearing are stable for the range of eccentricity (e) about 0.02 mm to 0.09 mm. Finally the thermohydrodynamic (THD) analysis of eccentricity ratio (e) has effects on the stability of the rotor-bearing system. | ||
| Keywords | ||
| hyperbolic disk; rotor; bearing system; critical speed; stability criteria | ||
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