Vibration Contron Of Rotots Systrm By Magneto-Rheological Damper

In order to solve the problems, such as too large vibration around the first critical speed, short safe-operating period and high failure rate of rotating machinery, this paper designed a new kind of magneto-rheological dampers for rotors, which were used in rotor vibration control filed, and contribute to supporting a new kind of active vibration control methord. The main research contents of this paper are as follows.(1) The mechanism and preparation method of magneto-rheological fluid was studied, and contribute to completing the preparation of the magneto-rheological fluid. A kind of magneto-rheological damper by shear mode was designed basic on the laboratory conditions and existing equipment, which magnetic field was simulated by ANSYS.(2) Different types of rotors system were designed and built, which consist of single-span rotor, single-span cantilever rotor, two-span rotors, two-span cantilever rotors. The vibration mode of those rotor systems were theoretically calculated.(3) The vibration control system was designed and built, including original data collection module, data real-time monitoring and transfer module, control module, magnetic control module, and damper execution module.(4) The damper was applied to the single-span rotor bench and the single-span cantilever rotor, which were used to study the rotor vibration suppressed effect by the damper. Those rotor faults, such as unbalance, rub and misalignment, were imitated at the bench. Experimental research was done to study the rotor vibration suppressed effect of the damper at different current in those fault cases of without stopping the machine. Experimental results show that the damper can suppress rotor vibration caused by those faults.(5) According to the experiment results, different control strategies were added in the vibration control system, including the switch control, servo control and PID control. Through monitoring the vibration amplitude real time, the damper’s current was automatically adjusted on the basis of those control strategies. Then the control effect of rotor vibration based on those control strategies was studied experimentally. The results show that these three control strategies can reduce the vibration when the rotor went through the first order critical speed safely.(6) According to the experiment results of sinle-span rotor, experimental research was done to study the rotors’vibration of two-span rotors and two-span cantilever rotors suppressed effect of the dampers at different current without stopping the machine. Then add three control strategies and the control system in these two rotors systems. Experimentally research the two-span rotors systems’vibration real-time online control effect. The results show that these three control strategies can reduce the vibration when the rotors went through the critical speed of first and second order safely.(7) In order to solve the problem that gears box’s vibration and noise are too large, a parallel shafts system bench with gears was established to simulate the gear box. Two dampers were installed at each shaft. Different working conditions were set to study the influences at different operating current of dampers. The results show that the damper can reduce the vibration of the gearbox, and the effect is better when the current increases. Application of MR damper can change current to adapt to different conditions by monitoring the gear box vibration damper, which can keep the vibration of the gearbox low.