Vibration Characteristics Analysis of Suspension Bridge Oil Pipeline Based on Experimental Research
[Purposes]In order to study the vibration characteristics of suspension bridge Spanning oil pipeline under internal fluid action,the vibration experiment of suspension bridge oil pipeline was car-ried out to obtain the vibration response mechanism,and the vibration characteristics of pipelines under different flow rates were studied,too.[Methods]In the experiment,strain gauge testing technology was used to collect the deformation data of suspension bridge pipeline under the action of internal fluid,the data were processed by using modal analysis methods and Fourier time-frequency transform,and the vi-bration response of suspension bridge oil pipeline was obtained.[Findings]The results show that the elastic excitation of the unstable fluid in the pipeline will induce the periodic vibration of the suspension bridge pipeline,and the response frequency of the pipeline in the horizontal and vertical directions are consistent.In the experiment,the modal of the pipeline in the vertical direction is the third order,the modal of the pipeline in the horizontal direction is the second order,and the strain and displacement in the vertical direction of the pipeline are larger than that in the horizontal direction.With the increase of flow,the modal amplitude,strain,frequency and displacement amplitude of the pipeline all increase.Un-der the experimental condition,the change of flow rate does not cause the change of the modal shape of the pipeline.[Conclusions]Appropriately reducing the flow rate,increasing the rigid support of the pipe-line system,and increasing the damping structure are all conducive to reducing the vibration of the pipe-line to avoid resonance,thus reducing the risk of fatigue fracture of the pipeline.The results provide a reference for the safe operation of the suspension bridge oil pipeline.
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