Research On Vibration Reduction Technology Of Multi-Span Rotors And Pipeline

Large rotating machinery and pipeline are important equipments widely used in petrochemical and electric power industry. However, vibration problems always exist in these equipments, which has serious bad effects on people and equipments’　safty. Rotor dynamic vibration absorbers are applied in vibration control of rotors which contribute to suppressing multi-spans rotors vibration on-line at critical speed without stopping machine running. Damping technology was applied on vibration control of pipeline. The main contents are as follow:1. Effects caused by rotor and pipeline vibration was analyzed. Vibration control methods of rotor and pipeline, research of dynamic vibration absorber were introduced.2. Finite element models of 2N or N+l support two-span rotors which connected by different couplings are constructed, coupling vibration laws of rotors syatem by two different supports which using different couplings were analyzed and calculated. Experimental rig of two-span rotors supported by 2N and N+1 were built. Experimental research of the two different supports rotors when they are connected by different couplings were studied.3. The rotor dynamic vibration absorber which is suitable for suppressing rotor vibration was designed and produced and switch control based on speed was also introduced. A single-span rotor test rig was built and dynamic vibration absorber was applied to control vibration which occurred during acceleration or deceleration of the rotor when its speed was passing through the first critical resonance region. Validity of dynamic vibration absorber controlling rotor vibration was confirmed.4. Finite element analysis and calculation of 2N support tow-span rotors and three-spans rotors were conducted and their critical speed or each order vibration types were also concluded.2N supported two-spans rotors and three-spanss rotors test rig were built with rotor dynamic vibration absorber installed in each shaft. Researches on vibration control law at each order critical resonance region of two-span rotors when it passed through the first two orders and three-spanss rotors when it passing through the first three order were conducted. In the end, the target control of 2N supported rotor shafting critical vibration was achieved.5. Finite element analysis and calculation of N+1 support shafting such as two-span three-support and three-spans four-support were conducted and rotors critical speed or their each step vibration types were obtained. N+1 supported shafting such as two-span three-support or three-spans four-support rotors experimental rig was built with dynamic vibration absorber installed in each shaft. Experimental research on vibration control law of each step resonance region of two-spans three-support or three-spans four-support rotors when it passing the first two order critical were conducted. Target control of N+1 supported rotor shafting critical vibration was achieved.6. The actual pipeline vibration situation and space structure were investigated in prtrochemical plants. Vibration reasons were analyzed. In addition, their corresponding finite element analysis was carried out and pipeline vibration damping modification scheme was formulated and optimized. According to the scheme, construction and reformation of pipeline were implemented. Finally, summary of modification achievements of pipeline vibration damping was finished perfectly.