Mechanical Analysis And Fluid Solid Coupling Calculation Of Deep Sea Mining Hard Pipe

In recent years,deep-sea mineral resources have become a global research hotspot.In the research of long-distance transport system for deep-sea mining,the pipeline structure of the transport system is easy to be damaged by sea water and wave erosion.Aiming at complex sea conditions,this paper establishes a simulation model.Based on the comparison of theoretical analysis and simulation results,it analyzes and optimizes the risks that may be encountered in the actual operation process.In this paper,several key factors affecting the vibration of hard pipe are analyzed emphatically.These include the length of the hard pipe,changes in the mass and volume of the relay bin connected at the lower end,the tolerance of the pipe wall,and the way the upper end is connected to the mining vessel.Based on the method of separation of variables,the influence of each variable on the vibration of the whole pipe structure is discussed,and an optimal design of the whole structure is carried out according to the numerical results.The whole comparative study shows that: 1.The natural frequency of the hard pipe of the deep-sea mining conveying system decreases obviously with the increase of the pipe length,and the formation is mainly dominated by bending vibration;2.When the length of the hard pipe is fixed,the natural frequency will decrease with the increase of the mass and volume of the relay bin;3.In the connection mode of the upper end,the amplitude of the fixed connection is the largest,and the amplitude of the elastic constraint is the smallest.It is recommended to choose the elastic constraint in the operation process;4.The hard pipe can be optimized by the design of the strong welding ring.By comparing the modal analysis results before and after the optimization,the superiority and operability of the optimization are proved.