输液管道振动分析的传递矩阵解

发布时间：2018-11-04 19:16

【摘要】：输液管道系统作为一种常见结构,广泛的存在于我们生活中的各个领域,在航空航天、海洋工程、石油化工、生物工程、核电工程、城市供水等大小领域都有着广泛的运用、占据着重要的地位。管道流固耦合的理论研究对工程实际中的经济效益和安全问题有着重要的作用,具有广泛的工程应用背景。本文运用传递矩阵法研究分析了输液管道系统的稳定性,并探讨了流体速度、支承条件等因素对结果的影响。对微型输液管,考虑微流体和微结构的尺度效应,修正微尺度管道的运动方程,探讨了这些因素对微型输液管弯曲振动的影响。本文对输液管稳定性问题的研究,主要进行了以下几部分的工作:(1)对几种经典边界条件的输液直管运用精细积分—传递矩阵进行稳定性分析,计算其失稳临界流速,并通过与以往文献计算结果相比较,表明文中方法的有效性。(2)对有中间支承的输液直管的稳定性进行分析计算,并探讨弹簧刚度、弹簧所在位置、铰支所在位置变化对输液管失稳临界流速的影响。该研究为提高系统的安全性和稳定性提供了理论依据,防止工程中因流致振动引起的结构破坏。(3)应用动力刚度—传递矩阵法分析微型输液管的稳定性问题,考虑微流量和微结构的尺度效应,对微尺度管道的运动方程进行改进,并在此基础上分析三种有代表性截面形状的输液管,并采用动力刚度—传递矩阵法来分析微型输液管道的振动特性,研究了微结构和微流体对结果的影响,使得对微型输液管的振动特性的研究更加深入、更加全面。
[Abstract]:As a common structure, pipeline system is widely used in many fields, such as aerospace, marine engineering, petrochemical engineering, biological engineering, nuclear power engineering, urban water supply and so on. Occupy an important position. The theoretical study of fluid-solid coupling in pipelines plays an important role in economic benefits and safety problems in engineering practice and has a wide engineering application background. In this paper, the transfer matrix method is used to study and analyze the stability of the pipeline system, and the effects of fluid velocity and supporting conditions on the results are discussed. Considering the scale effect of microfluid and microstructure, the equation of motion of micro-tube is modified, and the influence of these factors on the bending vibration of micro-transfusion tube is discussed. In this paper, the stability of transfusion tube is studied in the following parts: (1) the critical velocity of instability is calculated by using fine integral-transfer matrix to analyze the stability of the infusion tube with several classical boundary conditions. Compared with the results of previous literatures, the method is effective. (2) the stability of the pipeline with intermediate support is analyzed, and the stiffness of the spring and the position of the spring are discussed. The influence of the location of hinge support on the critical velocity of fluid transfusion tube instability. This study provides a theoretical basis for improving the safety and stability of the system and prevents the structural damage caused by vibration induced by flow in engineering. (3) the dynamic stiffness transfer matrix method is applied to analyze the stability of the micro transfusion tube. Considering the scale effect of microflow and microstructure, the equation of motion of micro-scale pipeline is improved, and on this basis, three kinds of transfusions with representative cross-section shape are analyzed. The dynamic stiffness transfer matrix method is used to analyze the vibration characteristics of the micro pipeline, and the influence of the microstructure and the micro fluid on the results is studied, which makes the study of the vibration characteristics of the micro transfusion tube more thorough and more comprehensive.
【学位授予单位】：华中科技大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U173

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