Parameter Optimization of Double Rotor Vibration Absorber
In order to solve the problem of excessive vibration when the gas turbine rotor is over-resonant due to mass imbalance and improve the system fault tolerance,a double-grounded rotor vibration absorber is studied.The dynamic model of the dual absorber-ro-tor system is established by using the finite element method,and the mathematical model of parameter optimization with the absorber parameters as independent variables is established.The differential evolution method is used to solve the optimal parameters.The opti-mal frequency ratio of the absorber gradually approaches 1.2 with the increase of mass ratio.The magnification of the double vibration absorber is about 0.12 lower than that of the single vibration absorber with the same mass ratio,and the fault tolerance of the rotor is a-bout 0.12 higher after the vibration absorber is installed.When the mass ratio of the two single absorbers of the double absorber is 0.055∶0.045,the magnification is 0.392,and the magnification is 0.31 when the mass ratio is 0.09∶0.01.When the installation position of the single vibration absorber with larger mass is closer to the target than away from the target,the magnification is lower and the rotor fault tolerance is higher.The double-grounded rotor vibration absorber has better vibration suppression effect than the single vibration absorber with the same mass,and the rotor with vibration absorber has higher fault tolerance.The double vibration absorber with high quality difference configuration has better vibration suppression effect;the rational use of the double vibration absorber can provide a certain guarantee for the safe operation of the rotor.
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维普
