Numerical Simulation And Experimental Study For Fluid-solid Coupling Vibration Of Lifting Pipeline In Static Water

Lifting pipeline is the key equipment in vertical ascending pipe system, and is very important for the security and reliable operation of the system. Once the lifting pipeline encountered damage,it may lead to the paralysis of the whole system and even cause serious accident and economic loss. The research for vibration characteristic of pipeline is the most basic and extensive content, which mainly focus on the internal law of inherent and dynamic characteristics of pipeline. In this paper, lifting pipe subjected to vertical cantilever restraint, external static water and internal transmission fluid was taken as the research object and its fluid-solid coupling vibration characteristics in different working condition was thoroughly analyzed, which provides a favorable reference for the design, checking, vibration mechanism and vibration reduction research.(1) Research development about pipe vibration is expounded, research work about mechanics analysis, fluid-solid coupling, vibration of cantilever pipe, study model and method are concluded and summarized in details.(2) Some basic theories about pipe vibration and FSI are introduced, mechanics and various physical field coupling of lifting pipeline in static water are analyzed, vibration differential equation is deduced based on Hamilton principle, FSI vibration equation is obtained by FEM, coupling vibration mathematical model is analyzed through fluid mechanics and elastic-plastic mechanics.(3) Fluid-solid coupling finite element model is established by finite element software ADINA, two and three coupling modal analysis on FSI of inner fluid-pipe and inner fluid-pipe-outer fluid are completed, the first ten order natural frequency and vibration modes are gained at different particle conveying volume concentration and sectional dimension, natural frequency of three FSI is compared with two FSI and no FSI , and the influence of FSI effects on natural frequency of pipe is discussed. Numerical solution of natural frequency is solved by FEM and MATLAB programming, the inherent characteristics of pipe at different volume concentration, sectional dimension are discussed, and the ADINA and MATLAB solution are compared in considering two FSI, which show that the two errors within reasonable limits and prove the accuracy of the results.(4) Finite element model of pipe and fluid are established respectively by ADINA, fluid-solid coupling dynamics analysis is conducted by adopting ADINA— FSI module, vibration dynamic characteristic for different run-time, constrain conditions, volume concentration and velocity is studied, and the stress, displacement are discussed in the above conditions.(5) Vibration test system of transporting process of lifting pipe in a mine is set up, vibration signal is collected and treated, and some related vibration characteristics in the conveying process are validated which show that the simulation results are consistent with experimental results in the whole.