Dynamic Analysis Of Complex Spatial Pipeline System And Its Experimental Verification

Pipeline is considered as one of the five main modern transport methods. And it has a wide rangeof applications in the aerospace, water conservancy, mechanica, architecture, chemical industry,nuclear industry,etc.Because of the severity of pipeline failure, it shows great significance of the studyof dynamic characteristics of the pipeline. In this paper, a pipe of a hydraulic test-bed and a complexspatial piping system test-bed are set for the research.Their dynamic models are establishedrespectively to find the vibration mechanism and the dynamic characteristics of spatial pipeline.Andverify them with the experimental method.Finally,several factors are researched on how these factorseffect on the vibration mode and the maximum stress of the pipe. The main research contents are asfollows:Firstly, the Pro-E software is used to establish the model of the pipe of a hydraulic test-bed whichcan be sent to the finite element software Ansys Workbench to do modal analysis, and the naturefrequencies and corresponding mode shapes are achieved.Secondly, the hammering method is used along three directions to carry out the experimentalmodal analysis to attain the nature frequencies. With the comparison with the above computationalmodal analysis result, it verifies the validity of the mode shapes from the calculation result.Furthermore, it can distinguish the nature frequencies and mode shapes in the three directions of thepipe system which can lend to the access of further research of the system under external excite.Thirdly, do the computational and experimental modal analysis respectively.The comparativeresult shows the feasibility of the above method,and it can be applied to the spatial piping system withcomplex installation.Fourthly, use the simulation tools to study how the internal flow velocity effect on the pipenatural frequency and how the pipeline trend effect on the maximum stress of the pipe.