Research Of Rotor Torsional Vibration Suppressed By Electromagnetic Damping Torsion Absorber

Rotor is the core component of rotating machinery,which plays an important role in petrochemical industry,transportation,national defense and other fields.Steam turbine rotor is widely used in power generation in power plants,but the short circuit and oscillation of the power system will produce short circuit fault and grid connection failure,and the torsional vibration caused by the fault often causes damage to the steam turbine shaft system.Short circuit and grid connection fault are random and difficult to completely avoid it,so it is of practical significance to inhibit the torsion and vibration of the steam turbine rotor so as to ensure the safety of the system.Therefore,this paper studies the suppression of rotor torsional vibration by magnetic damping vibration absorber,and the main work and conclusions involved in the research process are as follows:1)The centralized mass method is used to establish the mathematical model of the rotor axis system,and the simplified method of the complex axis system is introduced in detail.The transfer matrix of the axis system is derived,and the torsional vibration response is calculated using the Riccati transfer matrix method based on the axis system continuous mass model.2)Referring to the power shock absorber used to inhibit the lateral vibration of a single degree of freedom,the electromagnetic damping shock absorber specially designed to inhibit the rotor torsional vibration is designed.The calculation formula of the electromagnetic damping and the transfer matrix of the rotor are derived based on the fixed point theory.In order to achieve the best vibration damping effect,the current that needs to be connected in the electromagnetic damper is 0.55A.3)Simulation vibration absorber-rotor system under simple harmonic excitation characteristics,the short circuit fault excitation and the vibration absorber-rotor system is studied,the results show that the vibration absorber can effectively inhibit the steam turbine rotor production of torsion vibration,after the installation of the shock absorber system resonance peak frequency increases with the electromagnetic damping in the static current I₀ increase.4)Three intelligent optimization algorithms are used to further optimize the electromagnetic damping torsion shock absorber parameters,and to compare and determine the better algorithm.The comparative differential evolution algorithm has a better optimization effect.Based on this method,the influence rules of the vibration suppression effect and the optimal parameters are analyzed to provide reference for the actual structure design.