Research on Vibration Inherent Characteristics of Dense Paste Transportation Pipeline

During long-distance pipeline transportation of dense pastes, the periodic reciprocating pumping shock of the pump leads to serious vibration in the pipeline system which reduces the reliability and life cycle of the system. The vibration of the pipeline system varies based on the materials used and the filling volumes. To analyze the effect of filling volumes and material’s mass concentration on inherent frequency of pipes, vibration modal experiments were carried out on water filled pipes and coal slurry filled pipes through LMS multi-channel vibration noise test and dynamic analysis system. The results show that for water filled pipe, the inherent frequencies of the first three modes of pipe decreased with the increase of water filling volumes. For coal slurry paste filled pipe, in the same mass concentration range, the inherent frequencies of the first three modes of pipe showed a downward trend with the increase of filling volumes. When the filling volumes is the same, the inherent frequencies of the first three modes of the pipe generally increased with the decrease of the coal slurry’s mass concentration.