Based On The Integral Elastic Ring Squeeze Film Damper To Suppress The Over Critical Vibration Of Rotor And Study On Pipe Vibration Control

In the fields of aerospace,petroleum and petrochemical,the rotors of modern rotating machinery are developing in the direction of high speed and high power,and the operating speed is above the critical of the first order and belongs to the flexible rotor.When the rotor is over critical during start-stop or when it is subjected to other exciting forces,it may easily cause excessive vibration and even instability.Especially for the dual rotor structure of aero-engine,the rotor vibration problem is more prominent.In addition,the petrochemical equipment and pipeline vibration issues have also been an important factor hindering the company's safe production.Aiming at the problem of rotor critical vibration and fault vibration,this paper designed a new type of integral elastic ring squeeze film damper(Abbreviated as IERSFD)and magnetorheological integral elastic ring squeeze film damper(Abbreviated as MIERSFD).IERSFD is applied to the Jeffcott single rotor and double rotor support to study the effect of the rotor over critical vibration control.ApplyingMIERSFD to a four-disc rotor to perform an experiment based on NI control to suppress the critical vibration of the rotor.At the same time,the IERSFD was used to suppress the single rotor misalignment failure.Experimental comparison study on two kinds of dual-rotor balancing methods is carried out.Experimental analysis of the circular damping seal suppressing fluid vibration is carried out.Viscous damping technology was applied to suppress petrochemical pipeline vibration.The main contents of this paper are following:(1)Based on the principle of reducing the support stiffness and increasing the support damping to suppress the critical vibration of the rotor,the IERSFD and MIERSFD are designed.A damping vibration reduction mechanics model was constructed and the factors affecting the stiffness of the IERSFD were calculated using finite element software.(2)A Jeffcott single-disk rotor experiment platform was built to compare the effects of rigid support and IERSFD on the critical vibration of the rotor.The effect of IERSFD with different viscosity damping fluids suppressing the critical vibration of the rotor was studied.The experiment on suppressing rotor misalignment using IERSFD was carried out.(3)Experiments were conducted to semi-actively control the critical vibration of the rotor using the MIERSFD with different currents.(4)A dual-rotor experiment platform was built and the vibration characteristics of the double rotors was studied.A double-rotor balancing experiment was conducted to study the effect of different balancing methods on the critical vibration of the rotor.(5)The analysis and summary of the experimental data for the application of circular hole damping seals to high-speed turbopumps and suppression of fluid excitation was made.Inspected a coal chemical enterprise in Xinjiang.Vibration analysis of the pipeline vibration of a quench tower in an MTO plant was made.The viscous damping vibration reduction scheme was designed and a significant effect was achieved.A viscous damping vibration reduction scheme was proposed for the pipeline vibration problem from heat exchanger to flash tower in the heavy traffic asphalt plant of a petrochemical company in Weifang,Shandong Province.After the transformation,the vibration is reduced by 87%,so the effect is obvious.