Active Control On Vibration Of Multi-Disc Flexible Rotor System Mounted On Magnetic Bearing

Rotor dynamic design is one of the most important aspects of rotating machinery design. And the stability of running rotor system is of first importance in rotating machinery design. With the development of the modem industry civilization, all kinds of rotating machinery not only demand rapid speed, long and thin, high efficiency, but also demands lower noise and vibration, long life, and more reliability. The custom rotor-bearing system design is gradually unfit for the demand of development of modern industry.This paper discusses the active control design of rotor system mounted on the magnetic bearing in detail. Firstly, this paper discusses the mechanic model of rotor system mounted on the magnetic bearing. Secondly, this paper also discusses the most common methods of computing critical speed of rotor system that include the finite method and transfer method. Fourthly, this paper discusses the active control design according to the stability of running rotor system. Finally, this paper gives an example of active control design of rotor system mounted on the magnetic bearing and its simulated result.From calculating methods, this paper give a comparison between the finite method and the transfer method and choose the finite method as the basic computing method due to its higher precision and its more apt to connect with other control methods. Meanwhile, this paper slightly improves on the finite method that result in easier programming. As to the critical speed computing method, there is also an improvement. Compare to the charting, the method of iteration is a rapid and high precision method.From control method, this paper seeks for a majorized function according to the stability of running rotor system and properties of magnetic bearing in the first instance and then work out it. Against the optimal linear quadratic control, this method has its advantages.From the selection of bearing types, this paper chooses an advanced magnetic bearing. This kind of bearing has its peculiarity and will be the future direction of development of bearing technology.