磁流变液对转子系统的影响规律实验研究

Experimental study on the influence of magneto-rheological fluid on rotor system

针对磁流变阻尼器能够通过变刚度和变阻尼实现半主动控制,搭建单跨转子实验台,将磁流变阻尼器作为辅助装置安装于转子跨内,通过实验研究阻尼器内磁流变液对转子系统的影响规律。结果表明,阻尼器通电状况下,使用的磁流变液质量比较小,即铁粉占比较大时,阻尼器可等效为刚性支撑,为转子提供刚度,并改变其临界转速;阻尼器使用的磁流变液质量比增大到一定程度时,阻尼器为转子提供阻尼,能有效抑制转子振动;质量比继续增大,则振动降幅随之减小;磁流变液所用硅油黏度增大时,阻尼器对转子系统振动的抑制作用增强。

Magneto-rheological dampers can be semi-actively controlled by changing the stiffness or damping. A single -span rotor bench was established to simulate the starting process. A magneto-theological damper was installed at middle of the inside part of the shaft. The influence of the magneto-rheological fluid on rotor system was studied. The results showed that the damper can be regarded as a rigid support when the mass ratio of the magneto-rheological fluid is small, namely when there is a large proportion of iron powder in the magneto-rheological fluid. The damper provides stiffness for the rotor and the critical speed of the rotor is changed. The damper converts a rigid support into an elastic support when the mass ratio increases to a certain value and the damper provides damping for the rotor. The effect is weaker when the mass ratio is bigger. The reduction in the vibration of the rotor system is better when the viscosity of the silicone oil is higher.