Research On The Vibration Mechnismof The Gas-structure Coupled Pipeline

The gas has little effect on the air pollution, compared with coal and petroleum, belonging to the low-carbon, low-emission and environment protection energy. Also, the calorific and thermal efficiency of the gas are higher than those of coal and petroleum. Therefore, improving the gas proportion in energy consumption has become the important method to achieve the energy conservation and control the air pollution. However, in recent years, the pipeline fault occurred frequently in the shell gas and natural gas exploration. Therefore, to conduct the gas-structure coupled pipeline vibration mechanism research has significant energy strategy meaning on our country’s energy safety.In this paper, the gas-structure coupled pipeline is taken as the research object, the dynamic mathematical model and the vibration mathematical model of the gas-structure coupled pipeline are built and the simulation analysis of the empty pipeline and the gas-structure coupled pipeline is obtained on the ADINA finite element simulation platform. Then, the reasonableness and accuracy of the simulation analysis are verified experimentally. The detail researches are as followed:The pipeline vibration mathematical model is built. The modal analysis mathematical models of the empty pipeline and the gas-structure coupled pipeline are built. The modal analysis mathematical model of the empty pipeline is derived by the Rayleigh-Ritz energy method and the modal analysis mathematical model of the gas-structure coupled pipeline is derived by the fluid pipeline free vibration motion equation.The ADINA finite element simulation platform is used to conduct the modal analysis including frequency analysis and mode analysis. Firstly, the modal analysis of the empty pipeline is conducted, where effects of the pipeline length and the pipeline diameter on the empty pipeline natural characteristics are obtained. Secondly, the modal analysis of the gas-structure coupled pipeline is conducted, where effects of the pipeline length, the pipeline diameter and the gas pressure on the gas-structure coupled pipeline natural characteristics are obtained. Through the simulation analysis, effects of the pipeline length, the pipeline diameter and the gas pressure on the pipeline natural characteristics are obtained.The gas-structure coupled pipeline vibration test experiment platform is built, and the hammer hit experiment of the empty pipeline and the gas-structure coupled pipeline and the pipeline frequency response of the gas-structure coupled pipeline are achieved. The effect rules of the pipeline length and the pipeline diameter on the empty pipeline natural characteristics are verified. And, the effect rules of the pipeline length, the pipeline diameter and the gas pressure on the gas-structure coupled pipeline natural characteristics are verified. Meanwhile, the pipeline frequency response characteristics and rules are obtained under different gas pressure, different pipeline length and different pipeline diameter.