Abstract
The dynamic vibration absorber, which is adopted to suppress the unbalanced vibration of rotor, is optimized for the optimal parameters in this paper. This paper proposes a parameter optimization method for dynamic vibration absorbers and seeks parameters of a dynamic vibration absorber with better vibration suppression performance. Firstly, the frequency response function of the dynamic vibration absorber-rotor coupling system is obtained by using the finite element method. Then, basing on the optimal mathematical model, the optimal design variables are solved with the adaptive particle swarm optimization algorithm. Also, an example is used to prove the validity of the optimization design method mentioned in this paper. Further, in order to master the influence of deviation from the optimal value on the suppressing vibration effect, the vibration suppression performance changes of the dynamic vibration absorber whose parameters deviate from the optimal value are analyzed. The results show that: compared with conventional design method, this method is more superior; The dynamic vibration absorber with optimal parameters has better vibration suppression performance; At the same degree deviated from the optimal value, the stiffness has a more remarkable influence on the vibration suppression performance than damping for suppressing the first resonance; For the dynamic vibration absorber which is adopted to suppress the fixed-frequency vibration, the influence of stiffness deviation on the vibration suppression performance appears an obvious interval which is related to working speed.
Highlights
In modern rotating machinery, most of them work at supercritical or higher speed
The frequency response function of the dynamic vibration absorber-rotor coupling system is obtained by using the finite element method
Basing on the optimal mathematical model, the optimal parameters of the dynamic vibration absorber are successfully solved with the adaptive particle swarm optimization algorithm
Summary
Most of them work at supercritical or higher speed. Various factors, such as uneven adhesion of dirt, wear or shedding of impeller and blades, might lead to mass unbalances of the system during long-term operation. The frequency response function of the dynamic vibration absorber-rotor coupling system is obtained by using the finite element method. There are two types of dynamic vibration absorber, which are used to suppress vibration of the rotor system affected by unbalanced forces: One is used to suppress the first resonance of the rotor system during startup process, to reduce the response amplitude of first resonances; and another used to suppress the fixed-frequency vibration generated while the rotor running at speed ω to reduce vibration response amplitude One thing they have in common is that the optimization design methods they used, which can obtain the minimum response amplitude of the main system by finding optimal stiffness and damping of absorber. For details of adaptive particle swarm optimization algorithm method, refer to [20] listed in references
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