储能飞轮支承系统进动模态阻尼研究

Study on Whirl Modal Damping of Energy Storage Flywheel-Bearing System

高速运转的储能飞轮支承系统存在多个低频进动模态 ,这些模态的衰减指数对飞轮的安全运转具有决定意义。为提高模态阻尼 ,设计了引入外部阻尼的上、下阻尼器 ,具有恰当参数的阻尼器可以有效地改善飞轮转子支承系统的稳定性。本文求解飞轮转子支承系统的复特征值问题 ,分析了模态频率和模态阻尼比随转速的变化规律 ,对比了上、下阻尼器的功能 ,并讨论了下阻尼器刚度。

The rotor bearing system of an energy storage flywheel has several natural whirl modes with low frequencies. The modal decaying exponents of the whirl model decisively influence the running safety of the high speed flywheel. The upper and lower dampers are designed with proper parameters to enhance the stability of the system. The eigenvalues of the flywheel bearing system are solved and the changing patterns of the modal whirl frequency and modal damping ratio with the rising of the rotating speed are analyzed. The function of the upper and lower dampers and their effects on the modal damping ratio of the lower damper are also discussed.