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| Nonlinear vibration control for hydro-generator unit’s shafting based on MRD |
| SUN Wanquan1,2,ZHANG Ning1 |
1.School of Renewable Energy, North China Electric Power University, Beijing 102206, China;
2.Beijing Municipal Key Lab of Energy Safety and Clean Utilization, Beijing 102206, China |
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Abstract Considering actions of various nonlinear factors, a magnetorheological fluid damper (MRD) was introduced into nonlinear vibration model of a hydro-generator unit. The nonlinear dynamic model of the hydro-generator unit shafting based on MRD was established, and effects of MRD on its vibration were studied. Through contrastively study the new model and the traditional nonlinear model for hydro-generator unit, the results showed that using MRD damping passive control can significantly improve dynamic responses of the unit system, and reduce vibration displacement amplitudes and velocity responses of the unit system during its periodic motion without changing its motion form; it can also suppress complex quasi-periodic motion appearing after rotating speed rises under some transient conditions, and reduce its amplitude fluctuation.
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Received: 18 December 2018
Published: 28 December 2019
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