Research On Magneto-Rheological Damping Technology Of Rotors And Vibration Damping Technology Of Pipeline

To solve the vibration fault problems of rotating machinery vibration in the operating process, The magnetorheological dampers vibration suppressing technology of the rotors system was studied, hardware and control software was designed which targeted to suppress multiple rotors vibration online. And the damping force imposed on the rotors system can changed intelligently, which contribute to suppress the vibration of the rotors system. Aimed at the high vibration failure rate of the pipeline system, the study on applying viscous damper to the vibration suppression of the piping system was conducted. The main works are as follows:(1) The common cause and harm of the rotors system and the pipeline system vibration were analyzed, the research status of vibration control methods and application situation of magnetorheological damping technology are elicited.(2) Study on the principle of Magnetorheological fluid (MRP) model was carried out. And the magnetorheological damper was developed which was designed in basic of the magnetic field simulation calculation of the damper. Using Labview to design the control system, data collection and conversion analysis models. Several rotors system were designed, such as single span, two spans, three spans, four spans rotor system of the "2N" and "N+1" support. Critical speed and vibration mode was calculated by Dyrobes.(3) Experiments on single span rotor vibration suppression were done to get the best current value under the critical speed. The switch control strategy which opens the switch near the rotor critical speed and close under the noncritical speed was used to control the working state of the damper. The results show that the strategy can actively suppresses the vibration of the rotor system under the critical speed. The control system recognizes the vibration amplitude signal as the feedback to change the electric current of the MRF damper real-timely, effectively and dynamically. Then make the vibration amplitude of rotor near or below the target value.(4) The double spans four supports, three spans six supports, four spans eight supports of 2N support multi-span rotors test bench were established. The acceleration experiments were conducted. Study on the original vibration law of the rotors system when the magnetorheological damper off and the full control, switch control experiments were carried out. The effect of multi-objective targeted to suppress the vibration of 2N support type rotors system under critical speed was achieved successfully.(5) The double spans three supports, three spans four supports, four spans five supports of N+1 support multi-span rotors test bench were established. The acceleration experiments were conducted. Study on the original vibration law of the rotors system when the magnetorheological damper off and the full control, switch control experiments were carried out. The vibration law was more complex then the rotors of 2N support. Then full control and switch control experiments were carried out. The effect of multi-objective targeted to suppress the vibration of N+1 support type rotors system under critical speed was achieved successfully.(6) Analyzing the vibration reason of feed pipe of methanol absorber in a petrochemical plant in Hunan and the muffler of butadiene recycle gas compressor in an ethylene plant in Xinjiang. Study on the principle of viscous damper vibration suppression was carried out. The vibration reduction plan was designed. The viscous dampers were installed on the specific location of the pipes, which successfully reduced the pipelines vibration amplitude to safe range.