Research On Flow Induced Vibration And Sound Of Pipe

The vibration and sound of pipeline system are an important part of contribution tosound radiation of submarine. Research on performance of vibration and mechanism ofnoise is necessary to pipeline design. The source of pipeline vibration mainly includespower device incentive, the input of shell vibration and fluid impulse excitation. Thesource of pipeline noise mainly includes the input of power device, structural soundradiation and flow induced noise. The paper is focused on straight pipe and bending pipe,uses numerical methods to compute and analyzes flow induced vibration, flow inducednoise and sound radiation. And it includes some parts as follows:Firstly, it summarizes noise type of pipeline system, expounds the mechanism andmathematics model of hydrodynamic noise and gives noise control method of pipelinesystem.Secondly, FSI algorithm between CFX and ANSYS is compiled using CCL, APDLand MATLAB which can not only extend the fluid load, but also can accomplishcomputation of pipeline vibration in time domain and in frequency domain. Bycomputing the model, we can come to the conclusion that the total weighted vibrationlevel of simply supported straight pipe and bending pipe increases with square of velocityunder certain velocity.Thirdly, introduce ACTRAN process for the computation of flow induced noise. UseANSYS and ACTRAN to analyze structural sound radiation of piping wall, and use CFXand ACTRAN to analyze flow induced noise. Under certain velocity, the total radiatedsound power of piping wall, total sound pressure level and total radiated sound power offlow induced noise increase with square of velocity.Finally, the paper summarizes the content and gets some law. Simulation result canprovide reference for the pipeline design.