Research on Unstable Vibration Triggered by Impact Load During Clutch Engaging Process of Gas Turbine
This study addresses the unstable vibration phenomenon triggered by the engagement of the synchro-self-shifting clutch(SSS clutch),specifically focusing on a vibration failure in a heavy-duty combined cycle unit.The analysis delved into the impact of meshing angle discrepancies on vibration characteristics and investigated the underlying causes of vibration instabilities.To elucidate the dynam-ics,a comprehensive bearing-rotor model was developed,integrating the effects of unbalance forces and transient radial impacts.Through this model,the vibration response of the rotor post-impact was thor-oughly examined,shedding light on the unstable vibration mechanism during the engagement process.Fi-nally,practical measures for mitigation were proposed based on the findings.The findings indicate that sudden change in the center of the journal position occurs when the SSS clutch is engaged instantaneous-ly,indicating that a force is acting as an impact on the rotating shaft.The impact force varies in different states of engagement;these impact forces cause abrupt vibration changes,mainly manifesting as low-fre-quency components.The greater the impact force,the larger the low-frequency component deviation.The stability of the rotating shaft system is influenced by bearing loads.The greater the bearing load,the higher the system stability.It is concluded that reducing the engagement impact force and increasing the bearing load are two primary measures to solve the unstable vibrations induced by engagement impacts.
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