Dynamic Anlysis And Vibration Contral Analysis Of Liquid-conveying Bellows System Based On Ansys Workbench

The bellows is a kind of infusion pipe, and also the key element of compensation.The main structural feature of the bellows is expansion joints, having the effect ofvibration damping and noise reduction to the pipeline. Because temperature changes,mechanical displacement or fluid vibration, the vibration of the pipeline is often arousedin oil transportation, chemical industry, metallurgy, power transmission, shipbuilding,nuclear power, aerospace and other industrial fields. Especially in the practicalengineering, fluid-structure interaction makes the pipe produce the vibration phenomenon,and makes hazards of the structure of pipeline. The discontinuous pressure of liquid is thekey factor of pipeline vibration, so, it is necessary to make the research of dynamiccharacteristics of fluid-structure interaction of the infusion piping and vibration control,Take the bellows as an example, using the finite element software-ANSYS, fluid-structureinteraction vibration characteristics of the pipeline are numerically analyzed, which lay thefoundation for further study in engineering applications.According to the previous studies of infusion pipe fluid-structure interaction, thepiping system fluid-structure interaction vibration mechanism is understood by theinfusion piping system of axial vibration4-equation model and lateral vibration4-equation model. If the unstable factors are ignored in the vibration control equation, thecontrol equation can be obtained under the steady-state conditions, further the initialcondition of the pipeline system can be determined. Then base on the infusion straightpipe vibration control equations, the initial conditions and boundary conditions of thefluid-structure interaction bellows are determined, providing a theoretical basis for thefinite element modeling and setting of boundary model conditions in ANSYS Workbench.A high precision finite element model of the bellows is built by Pro/E and ANSYSICEM. Using the two-way implicit iterative method of ANSYS Workbench software,dynamic characteristics of the pipeline system are numerically calculated. By comparingthe vibration characteristics of the bellows and straight pipelines, it is found that variablecross-section of the bellows is the main factor that causes strong fluid-structure interaction.For the two different forms of the inlet pressure (atmospheric pressure and continuouspressure pulse), the vibration characteristics of the bellows are analyzed, the results showthat the bellows are more violent vibration under the continuous pressure pulses, providinga valuable reference for engineering applications and vibration control of the bellows. The vibration control of the bellows is preliminary investigated, the control measureis that a layer damping material is attached to the inner wall of the bellows. In the case ofother parameter unchanged, the simulation results show that the method can effectivelystabilize the liquid flow field in the pipe, and suppress the vibration of the bellows...