Analysis Of Pipe Vibration Characteristics On800MN Die Forging Hydraulic Press

Pressure piping systems are widely applied in marine engineering, oil and energyindustry, as well as heavy processing industries, and how to control or reduce pipevibration due to the pressure of liquid within the tube unsteady flow inevitably becomeurgent research. Particularly for running in extreme conditions of pressure, flow,800MN forging presses, once caused machine vibration, coupled with the role ofenvironmental stress due to pipe vibration, vibration failure will expand rapidly, thewhole huge system will result in disaster consequences. So, studying the pipe vibrationcharacteristics of800MN forging press has far-reaching significance for improving theefficiency of the press work to ensure that their work performance and production safetyThe transmission and reflection equations is derived for hydraulic shocks andpressure pulsation in800MN forging presses pipeline structural unit such as straightpipe and reducing pipe,and obtaining that the main cause hydraulic impact andincreasing pressure of the shock wave is the valve that exists at the end of the pipelinesystem. Also the appropriate choice in800MN forging presses pipeline location and thepipe length can effectively control the pressure fluctuation. In addition, put forwardsome measures to reduce the hydraulic impact and mitigation of the pressure pulsationfrom the structure.Then the special structural unit in the pipeline of800MN forging presses such asreducing pipe, tube bending, the three-way tube and the throttle valve orifice flow fieldwas simulated numerically, and draw a conclusion that the main reason to stimulatepipe vibration is the turbulent dissipation and local swirl flow in800MN forging pressespipeline. Also simulated the changes in the flow field in the tube at the three-way tubein the case of whether the pressure fluctuation, draw a pressure fluctuation will furtherincrease the pipeline vibration.Finally a physical model diagram of800MN forging presses in the first group of12pump station piping system from the pressurized tank to the main working cylinder isestablished, And proceed the static and dynamic analysis for system model, includingthe first pipe stress check,the secondary pipe stress check, natural frequency andassociated vibration mode analysis, pipeline maximum deformation in the resonantforce, maximum displacement results and the calculation of fluid column inherentfrequency in a simple straight tube. Through simulation, the pipeline model can content with the normal work under high pressure and large flow environment. Besidescompared with five order of natural frequency of the liquid column in a simple straighttube, the excitation frequency of the pump, and the five order of natural frequency ofthe piping structure and found that didn’t exist three frequency coincidence of the area,so there is no resonance of the piping system to achieve the goal of a low-vibrationpiping systems.