Research On Dynamic Balance Method Of Multi-disk Rotor And Vibration Reduction By Pipeline Damping

With the development of modern industrial technology and economy,the requirement of high speed,high efficiency and low energy consumption is put forward for production equipment,and the higher reliability requirement is put forward for the rotating machinery and auxiliary pipeline system.The vibration of rotating machinery caused by unbalanced faults is particularly prominent.Aiming at the problem of unbalanced vibration of multi-stage compressor equipments such as gas turbine,aeroengine,the dynamic balance of double-sided influence coefficient method was studied to control unbalanced vibration of rotor.In this thesis,a squirrel cage elastic support was designed,and a rigid multi-stage wheel-disk rotor test bench and a flexible multi-stage wheel-disk rotor test bench with elastic support were built.Combining with virtual dynamic balance,the vibration control experiment of dynamic balance was carried out.A three-stage wheel-disc rotor test bench was built,and the modal dynamic balance method was studied experimentally.Aiming at the vibration problem of pipeline system,the viscous damping vibration control technology was studied to realize the actual installation of the project and solve the vibration problem.The main contents are as follows:(1)A rigid-supported rotor test-bed consisting of nine-stage compressor disk and one-stage turbine disk was built.Under different unbalanced conditions,the optimal selection of the counterweight surface was studied by using the method of double-sided influence coefficient.(2)A squirrel cage elastic support for a specific rotor structure and installation space was designed.An elastic-supported rotor test bench was built to simulate the influence of support stiffness on the critical speed and mode of vibration of the rotor system.At the same time,the vibration responses of different planes at the support were extracted.The attenuation effect of elastic support on vibration signals was analyzed experimentally.The problem of supercritical vibration control of rotor support system with different vibration modes after dynamic balancing was studied.(3)Three kinds of test benches of rotor support system were built,including left-elastic-supported and right-rigid-supported rotor system,left-rigid-supported and right-elastic-supported rotor system,left-elastic-supported and right-elastic-supported rotor system.The dynamic balance experiments of double-sided influence coefficient method under different modes of vibration were carried out.The effect of the change of the counterweight plane on the counterweight mass of multi-disk rotors under different supporting forms was studied.(4)The modal dynamic balancing method was studied.The mechanism and dynamic balance effect of the double-sided influence coefficient method,the N plane method and the N+2 plane method under different modes of vibration were compared by the three-stage disk rigidly supported rotor test-bed and the left-elastic-supported right-elastic-supported rotor test-bed.(5)Aiming at the vibration problem of centrifugal compressor filter separator device pipeline and reciprocating compressor buffer pipeline,through field measurement,modeling analysis and optimization design,the viscous damping vibration reduction technology was used to install and transform,and good vibration reduction effect was achieved.