Research On The Vibration Controlling Of The Rotor System By Means Of Viscous Dampers And Tuned Mass Dampers

The rotor system is a core component of the large rotating machinery. During operation, the machine may be caused different levels of vibration due to the unbalance, rubbing, misalignment, oil whirl and other faults. However, how to take effective measures to reduce the vibration of the rotor system has become a hot issue. In this paper, based on the research of the traditional damping technology, a new shear viscous damper with a high damping effect was designed and introduced into the passive controlling vibration of the rotor system caused by different failures.On the basis of studying passive damping vibration reduction, a kind of semi-active tuned mass damper (STMD) was designed for the high-frequency vibration of the rotor unbalance, so it could achieve the online active control of the rotor system vibration. The main contents are as follows:(1) The damping characteristics of viscous dampers were analyzed theoretically. And the mechanical model of the new shear viscous dampers designed for a rotor system was also established.(2) Study on the viscous damper controlling unbalance vibration of the rotor system. The damping mechanism for the rotor unbalance vibration was studied, and the single-span and the two-span rotors vibration reduction benches were also designed. The damping characteristics of viscous dampers for single-span rotor and two-span rotors system unbalance vibration were explorated by means of the finite element simulation and experimental methods.(3) Study on the viscous dampers suppressing the rotor rubbing vibration.The finite element method was used to theoretically study the vibration suppression effect for a damper acting on a single disc and sliding support film bearings rotor system with rubbing fauts. On the basis of theoretical analysis, experimental bench was designed for verification. The researched results show that the damper can effectively eliminate the complex high-frequency rubbing vibration of the rotor system.(4) Study on the viscous dampers suppressing the rotor misalignment vibration. The finite element method (FEM) analysis was used to discuss the shear viscous dampers inhibition on the right vibration response. Also, the corresponding experiment platform was designed for validation. And the researched results show that the damper can effectively control the rotor misalignment vibration, improving the stability of the rotor system.(5) Research on the viscous dampers inhibiting the gear shaft vibration. Based on the more complicated vibration and noise characteristics of gear box, viscous damper was designed and actting on the gear shaft to achieve the purpose of reducing the gear box vibration. Different gear vibration test benches were set up to verify the vibration characteristics of viscous dampers, which provided a new method for reducing gear vibration.(6) The vibration controlling mechanism of the tuned mass dampers for structures was analyzed theoretically, and the steady-state response of the main system with and without TMD was derived. The structural parameters, such as the TMD mass ratio, frequency ratio, affecting the quality of the damping effect were discussed by the use of simulation in MATLAB. On this basis, a new cage-type tuned mass damper was optimizedly designed for the rotor system. And its structural properties were studied by the use of the finite element method and experiment.(7) The novel cage-type tuned mass damper was applied to the rotor system, and the based on segmentation speed control strategy was designed to control the stiffness and mass parameters of the TMD online, so that it can achieve the semi-active control of the rotor system. The damping performance was simulated through the rotor dynamics simulation analysis. The comparison of the vibration reducion effect between the uncontrollable cage-type TMD and controllable TMD actting on a single-span rotor, cantilever span rotor and two-span rotors system was comparative experimental analyzed, which indicates that the controllable cage-type TMD can well avoid the two new resonate peaks caused by the uncontrollable TMD, and it can play a more effective role in TMD vibration absorption, having more advantagesas opposed to non-controllable TMD.