基于流固耦合的L型液压波纹管振动分析

发布时间：2018-06-25 12:40

本文选题：L型液压波纹管 + 流固耦合　；参考：《湖南科技大学》2017年硕士论文

【摘要】：波纹管应用十分广泛,是工业当中一种重要的补偿器件,其主要结构为波形关节,在实际应用当中L型折弯的波纹管更是十分常见,但波纹管会随着外界条件的改变引起振动,这种特性在诸多领域如石化工业、钢铁冶炼、电力输送、船舶工程、航天航空等现实中有着重大表现。在这些行业的应用过程中由于流固耦合振动,导致的各种重大安全事故或者安全隐患屡见不鲜,尤其是L型折弯的波纹管由于形状的突变更是容易导致振动的发生,探究L型液压波纹管在流固耦合过程中振动特性,并提出相对应的有效L型液压波纹管降振方案具有重大的理论意义和实际应用意义。本文正是基于此建立了L型液压管流固耦合数学模型和轴向及横向动力学模型,通过有限元ANSYS软件建立了L型液压管流固耦合仿真模型,通过实验验证仿真模型的正确性,在基础上分析L型液压波纹管振动特性,并在此基础上提出了L型液压波纹管有效降振方案。从而给波纹管管道的科学研究和工程应用提供理论支撑和指导。本文主要研究内容如下:(1)在介绍国内外关于液压管流固耦合研究现状基础上,提出了L型液压管流固耦合数学模型,通过建立L型液压管流固轴向和横向振动模型方程探究其流固耦合振动机理,并对L型液压管流固运动特性进行了描述,对流固耦合仿真的边界条件进行了确定,这些都可以为L型液压管流固耦合仿真模型在ANSYS Workbench中的建立提供有力的理论支撑和参考。(2)采用Pro/E三维软件建模并导入ANSYS ICEM中,建立得到L型液压管的有限元仿真模型,经过仿真分析得到L型液压管折弯部位和波纹管变截面外形部位是导致流固耦合振动的两个主要因素;并通过搭建实验验证平台验证了所建立的仿真模型合理性。(3)对进口压力是常数和进口压力是连续脉冲时L型液压波纹管的振动特性,并进行了影响分析,分析结果表明当进口压力为连续压力脉冲时,L型液压波纹管更加剧烈。(4)最后提出了L型液压波纹管降振方案,可将一层具有阻尼特性材料附着在L型液压波纹管的内壁处,在其他变量不变的前提下,通过仿真表明,所提出的方案能有效降低并稳定L型液压波纹管的液体流固耦合振动。
[Abstract]:Corrugated tubes are widely used and are an important compensation device in industry. Their main structure is corrugated joints. In practical applications, L-bend bellows are very common, but corrugated tubes will vibrate with the change of external conditions. This kind of characteristic has great performance in many fields such as petrochemical industry, iron and steel smelting, electric power transmission, ship engineering, aerospace and so on. In the application process of these industries, due to fluid-solid coupling vibration, various major safety accidents or hidden dangers are common, especially L-shaped bellows are prone to vibration because of the sudden change of shape. It is of great theoretical and practical significance to explore the vibration characteristics of L-type hydraulic bellows during the fluid-solid coupling process and to put forward the corresponding effective L-type hydraulic bellows. Based on this, the mathematical model of fluid-solid coupling of L-type hydraulic pipe and the axial and lateral dynamic model are established. The simulation model of fluid-solid coupling of L-type hydraulic pipe is established by finite element ANSYS software, and the correctness of the simulation model is verified by experiments. Based on the analysis of the vibration characteristics of L type hydraulic bellows, an effective scheme for reducing vibration of L type hydraulic bellows is proposed. It provides theoretical support and guidance for the scientific research and engineering application of bellows. The main contents of this paper are as follows: (1) on the basis of introducing the research status of hydraulic pipe fluid-solid coupling at home and abroad, a mathematical model of L-type hydraulic pipe fluid-solid coupling is proposed. The mechanism of fluid-solid coupling vibration of L-type hydraulic pipe is studied by establishing the model equation of axial and lateral vibration of fluid-solid in L-type hydraulic pipe. The characteristics of fluid-solid motion of L-type hydraulic pipe are described, and the boundary conditions of fluid-solid coupling simulation are determined. All these can provide powerful theoretical support and reference for the establishment of fluid-solid coupling simulation model of L-type hydraulic pipe in ANSYS Workbench. (2) the finite element simulation model of L-type hydraulic pipe is established by using Pro-E three-dimensional software modeling and importing into ANSYS ICEM. Through the simulation analysis, it is found that the bending position of L-type hydraulic pipe and the shape of corrugated pipe with variable cross-section are the two main factors that cause the fluid-solid coupling vibration. The rationality of the simulation model is verified by setting up an experimental verification platform. (3) the vibration characteristics of L-type hydraulic bellows are analyzed when the inlet pressure is constant and the inlet pressure is continuous pulse. The analysis results show that the L type hydraulic bellows are more intense when the inlet pressure is continuous pressure pulse. (4) finally, a vibration reduction scheme of L type hydraulic bellows is proposed, which can attach a layer of material with damping characteristics to the inner wall of L type hydraulic bellows. The simulation results show that the proposed scheme can effectively reduce and stabilize the fluid-solid coupling vibration of L-type hydraulic bellows.
【学位授予单位】：湖南科技大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：TH137.5

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