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- Title
Modal Analysis and Optimization of Fluid-Structure Coupling for Rotor and Inner Cylinder of Vertical Condensate Pump.
- Authors
Xiao-feng HE; Xiao-feng LIU; Yun-xiang MA; Cheng-bin LU; Yang WU; Zhong-fu NIE
- Abstract
Based on the acoustic method, the dynamic model of the rotor and inner cylinder of Jiangsu Guohua Chenjiagang Power Plant 2B condensate pump is established to compare the difference between dry modal and fluid-structure coupling modal, the influence of perpendicularity, concentricity and bearing wear on the natural frequency of rotor is studied. The results show that the fluid-structure coupling modal is much lower than the dry modal, so it is necessary to consider the fluid force in the dynamic analysis. The rotor is rigid under normal conditions and will not cause resonance. When the bearing is worn, the frequency of the rotor will be greatly reduced and may fall into the frequency conversion operation range to excite resonance. The deviation of perpendicularity and concentricity will not directly lead to the decrease of the rotor modal but will lead to the increase of bearing stress, aggravate bearing wear, and then affect the rotor modal. As the inner cylinder only relies on the fixed support at the top, the structure stiffness is low, which may lead to lowfrequency resonance. By adding two support structures at the guide vane, the first-order modal frequency of the inner cylinder can be increased from 3.29 Hz to 28.88 Hz, effectively avoiding the operating frequency range of the system. This study can provide guidance for the optimization of similar pump structures.
- Subjects
MODAL analysis; FREQUENCY changers; ROTORS; BEARINGS (Machinery); COUPLINGS (Gearing); DYNAMIC models; RESONANCE
- Publication
International Journal of COMADEM, 2023, Vol 26, Issue 4, p45
- ISSN
1363-7681
- Publication type
Article