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Study On Forming Mechanism Of Bionic Drag Reduction Surface For Oil And Gas Pipelines

Posted on:2014-02-24Degree:MasterType:Thesis
Country:ChinaCandidate:W B YuFull Text:PDF
GTID:2251330425966529Subject:Mechanical Manufacturing and Automation
Abstract/Summary:PDF Full Text Request
The drag-reducing effect of bionic non-smooth surface has been recognized by theacademic world, and the resultant application is being perfected. Bionic drag-reducingsurfaces forming process is one kind of forming technology of characteristic structure inmillimeter level, which has a great advantage in the production efficiency and has importantapplication prospect in gas and oil pipeline drag reduction, in contrast to other non-smoothsurface machining.At present, the research related with heat rolling technology of polymer is increasinglyvalued by scientists and engineers, and thus becomes a hot button in the manufacturing area.As the pipeline, which is a special carrier of petroleum and natural gas, is being used widelywith the rapid development of the energy industry, in-depth research on the flowcharacteristics of the polymer material under the different temperature and exploration of theeffect of hot-roll process conditions on the final roll quality are becoming increasinglyimportant.At first, the overall structure of pipe inner robot is analyzed, on the basis of which, thekey component hot roller head is designed, transmission system models of the hot processingdevice are established´╝îand their dynamic characteristics are analyzed.Through the creep and stress relaxation behaviour, polymer viscous-elastic model wasanalyzed, and through the tensile stress relaxation experiment data, the model of theviscous-elastic is established based on generalized Maxwell model, using MATLAB toolboxfunction regression analysis.In the process of numerical simulation analysis of the continuous hot-roll, theviscous-elastic material model is used to describe the mechanical behavior of polymercoatings. Besides, the process and method of modeling are mainly analyzed. At last, thetemperature dependence and time dependence of the polymer material have been analyzed.Experiment analysis of the different combinations of rolling temperatures, rolling speedsand rolling depths has been applied to the study on the processing forming regulation which iscontrasted to the numerical simulation results. Finally orthogonal experimental method isused to analyze the effect of hot roll process parameters on the morphology of embossed pits,and draw a set of optimal combination of parameters is obtained.
Keywords/Search Tags:bionic drag-reducing, non-smooth surface, hot-roll, polymer material, numerical simulation
PDF Full Text Request
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