Safety Analysis On Torsional Vibration Of The Feedwater Pump Shaft With Frequency Control Consindering Electromechanical Coupling

In recent years,thermal power units to participate in the peak,peak range of some units reached half of the rated value,how to effectively reduce the power consumption rate has become a key,and to pump as the largest power plant auxiliary equipment especially needs to be improved.The water pump reform scheme of popular is the use of inverter,while saving energy significantly,but the problem of shaft safety have gradually emerged,some units in the frequency converter and the occurrence of broken shaft accident.So in this paper,the three schemes of frequency conversion of feed water pump are calculated and analyzed,and the scheme is evaluated.In this paper,the three possible schemes of frequency conversion of feed pump are analyzed,and the corresponding shafting model is established.The scheme of gear box connection is analyzed emphatically,and the multi section lumped mass and the finite element model of the gear rotor are obtained.The key of the model is to gear the gear model,get the corresponding gear unit,and analyze the influence of the gear meshing stiffness on the bending and torsional frequency of the system;By using Simulink to establish the model of frequency conversion and speed regulation of the motor system,the disturbance source is simulated and analyzed,and the corresponding electromagnetic torque fluctuation is obtained;Finally,the response of the ANSYS is calculated,and the stress response of the dangerous section is obtained,and the damage is obtained according to the life theory;In this paper,the electromechanical coupling simulation system is built by using Simulink platform.