Effect of parameters on the rubbing condition of an unbalanced rotor system with initial permanent deflection |
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Authors: | Xiaoyao Shen Jiuhong Jia Mei Zhao |
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Affiliation: | (1) State Key Laboratory of Vibration, Shock and Noise, Shanghai Jiaotong University, Shanghai, 200240, People’s Republic of China |
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Abstract: | A rotor-stator rubbing Jeffcott model of a rotor system with mass unbalance including the mass eccentricity and the initial
permanent deflection was set up and the corresponding governing motion equation was derived by d’Alembert principle. Through
the analytical method, the rubbing condition was analyzed. Whether the rub would happen and when the rub would happen were
well solved. The amplitude of the rotor center was calculated, and the rubbing factor was introduced to determine whether
the rub would happen or not for all rotating speeds. Rubbing speeds when rub began to happen were obtained. Parameters such
as the mass eccentricity, the initial permanent deflection, damping coefficients, and the phase angle between the mass eccentricity
and the permanent deflection were used to analyze their effect on the rubbing condition. Results were obtained and could be
used to prevent the rubbing fault or decrease the damage of the rub and diagnose or balance the initial permanent deflection
fault. |
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Keywords: | Jeffcott rotor system Mass unbalance Rubbing condition |
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