变频辅机振动特性分析与抑制方法研究

Characteristics Analysis and Suppression Method for Vibration in Frequency Conversion Auxiliary Equipment

从变频电动机谐波扭矩机理出发,理论分析了变频工况下谐波扭矩特性以及产生扭振结构共振的原因,得出脉动谐波扭矩的计算公式。建立了转子动力学模型,模拟分析了脉动谐波扭矩对轴系的影响,得出在变频工况下机组电动机侧联轴器处脉动谐波扭矩值最大。相应地给出了一种扭振抑制方法,结果表明,刚度阻尼质量系统可明显降低脉动扭矩幅值。

Based on the mechanism of harmonic torque in frequency conversion motor,the harmonic torque characteristic under frequency conversion condition and the cause of resonance in torsional vibration structure were theoretically analyzed.Then the calculation formula of impulse harmonic torque was derived.The dynamic mode of rotor was established to analyze the influence of impulse harmonic torque on the rotor system by simulation.It was concluded that under frequency conversion condition,the highest value of impulse harmonic torque appeared in the coupling on the motor side of unit.Corresponding method to suppress the torsional vibration was then proposed,and it was indicated that stiffness damping mass system could obviously reduce the impulse torque amplitude.