Dynamic Anlysis And Vibration Control Analysis Of Liquid-Conveying Pipe System Based On Ansys Workbemch

Liquid-conveying pipe system is universal existence in various industrial fields, especially in process industries. The failure of pipeline system resulted from the destroying of pipe and dynamic machinery is of common occurrence. The primary reason of pipeline's vibration is that discontinuous pressure of liquid cause solid-fluid interactive vibration of pipeline system. So it is necessary to study the liquid-conveying pipe system's fluid-structure-interaction vibration and give more deep discussion and analysis of the vibration control of pipeline system.The fluid-structure-interaction vibration mechanism is studied in this article by deducing the 4-equation model of both axial and transverse vibration of liquid-conveying pipe system. And by neglecting the vibration control equations'non-stationary terms, the govern equation under stability condition is gotten. Then the initial condition of liquid-conveying pipe system is worked out according that equation. The boundary conditions are obtained from a physical situation at valve or elbow, forming the foundation for establishing the simulation model of liquid-conveying pipe system.Fluid-structure-interaction simulation model is built using the two-way implicit iterative method of ANSYS Workbench software. The vibration characteristic of pipeline and flow-field in time domain are obtained and further analysis is made through the use of multi-field solver-multiple code coupling--MFX. The simulation model is proved correct after comparing the simulation results and experimental results.Making simulation model of bend pipe system is to study the vibration property of pipe system in two various pressure load form at inlet. Vibration control analysis is done by selecting the liquid-conveying pipeline system under continuous pulsed pressure load which is more suitable to engineering reality. Aiming to work out coupling vibration property and damping effect of pipe system, orifice plates with different size are installed at pipe outlet department. Four cases, with different ratio (40% -10%) of the hole area to orifice plate area, are discussed. After researching simulation results, it is founded that when the ratio is 20% -10%, it is the most favorable to the model's vibration control. Continue modeling simulation when the ratio is 16.5%, then, a conclusion is draw that it has certain effect both for accelerating stability of tube flow field and for inhibiting pipeline vibration.