Research On Fluid-structure Coupling Vibration Analysis And Vibration Abatement Technology Of ZW Reciprocating Compressor And Its Piping System

In this paper,a gas-solid coupling study was carried out using an integrated model of a primary reciprocating compressor outlet piping system to carry out a gas-solid coupling study,analyze the causes of excessive vibration in the piping system of the test bench.An innovative semi-active-passive magnetorheological damper with removable and replaceable excitation coils,the damping effect of magnetorheological dampers is verified by means of experiments and simulations.The main findings are as follows:(1)Simulation analysis of the causes of vibration overload in piping system based on integrated gas-solid coupling technology.The experimental and numerical simulation techniques are used to investigate the causes of vibration exceedances in the piping system of the test bench,which was based on the integrated gas-solid coupling model.The results showed that the vibration of the piping system exceeds the standard because of the resonance at the first frequency(first-order inherent frequency),the numerical simulation results of the coupling interaction are closer to the experimental values,which verified the positive determinism of the simulation method.The effect of coupled high and ultra-high pressure airflow on the intrinsic frequency of the pipeline was predicted.The results showed that when the gas pressure is between 195～300 MPa,the inherent frequency basically increases with the increase of working condition.The results of the study provide a reference for when gas-solid coupling needs to be considered in the research of pipeline system vibration characteristics.(2)Innovative design of magnetorheological dampers based on magneto-fluid coupling technology.A semi-active-passive magnetorheological damper with removable and replaceable excitation coils,double diaphragm and spring-multiple damping,double magnetic field and magnetic isolation-multiple magnetic field regulation structure is developed for the damping of piping systems using the working principle and theoretical basis of shear-valve magnetorheological damper.Predictive evaluation of magnetorheological dampers was carried out by using ANSYS magnetic field analysis and magneto-fluid coupling analysis modules.The results showed that the magnetic field strength,magnetic flux density and current density generated by the winding coil meet the design requirements of the magnetic field distribution of the magnetorheological damper;the magnetorheological fluid flow rate,pressure distribution,magnetic induction intensity distribution and Lorentz force distribution under the action of permanent magnet,electromagnetic and magnetic isolation are all consistent with the operation of magnetorheological fluids in magnetorheological dampers.(3)Research on multi-objective multi-parameter based optimal vibration reduction technology.The optimal damping effect of magnetorheological dampers in piping system was investigated using the multi-objective parameter optimization method.The results showed that the best installation position is 0.007 m to the right of the bend at the outlet of pipe L5,and the best stiffness is 2801 N/mm.Comparing the effect of rigid pipe clamps,dampers and magnetorheological dampers on the vibration control of piping system,the experimental results show that the reduction rate of rigid pipe clamps is 43.76%,the reduction rate of dampers is78.64%,and the reduction rate of magnetorheological dampers is 80.17%.The damping effect of magnetorheological dampers is better than other damping devices,which further verifies the effectiveness of the damping technique.