不同约束条件对深海采矿输送管道动力学的影响

In view of the influence of different constraints on vibration characteristics of transportation pipe-line , the research mainly focuses on the effects of hinge and elastic constraints on the natural frequenciesand modes of the pipeline by the bidirectional fluid structure interaction. With the results of modal analysisand the stress and deformation on the pipe outer wall , the harmonic response of elastic-constrained pipe isanalyzed , and the structure is optimized according to the analysis results. The results show that the elasticconstraint pipe has the largest natural frequency , the smallest amplitude , and the simplest vibration mode;therefore , it is the most suitable choice for the top of the pipe in the actual project. When the excitation fre-quency is close to the seventh-order natural frequency , the vibration response of pipeline is the most in-tense.The method of welding strong ring is used to optimize the pipeline , and the results of modal analysisbefore and after the optimization are compared , which proves the feasibility of the optimization.