本文選題：L型液壓波紋管 + 流固耦合�。� 參考：《湖南科技大學》2017年碩士論文

【摘要】：波紋管應(yīng)用十分廣泛,是工業(yè)當中一種重要的補償器件,其主要結(jié)構(gòu)為波形關(guān)節(jié),在實際應(yīng)用當中L型折彎的波紋管更是十分常見,但波紋管會隨著外界條件的改變引起振動,這種特性在諸多領(lǐng)域如石化工業(yè)、鋼鐵冶煉、電力輸送、船舶工程、航天航空等現(xiàn)實中有著重大表現(xiàn)。在這些行業(yè)的應(yīng)用過程中由于流固耦合振動,導致的各種重大安全事故或者安全隱患屢見不鮮,尤其是L型折彎的波紋管由于形狀的突變更是容易導致振動的發(fā)生,探究L型液壓波紋管在流固耦合過程中振動特性,并提出相對應(yīng)的有效L型液壓波紋管降振方案具有重大的理論意義和實際應(yīng)用意義。本文正是基于此建立了L型液壓管流固耦合數(shù)學模型和軸向及橫向動力學模型,通過有限元ANSYS軟件建立了L型液壓管流固耦合仿真模型,通過實驗驗證仿真模型的正確性,在基礎(chǔ)上分析L型液壓波紋管振動特性,并在此基礎(chǔ)上提出了L型液壓波紋管有效降振方案。從而給波紋管管道的科學研究和工程應(yīng)用提供理論支撐和指導。本文主要研究內(nèi)容如下:(1)在介紹國內(nèi)外關(guān)于液壓管流固耦合研究現(xiàn)狀基礎(chǔ)上,提出了L型液壓管流固耦合數(shù)學模型,通過建立L型液壓管流固軸向和橫向振動模型方程探究其流固耦合振動機理,并對L型液壓管流固運動特性進行了描述,對流固耦合仿真的邊界條件進行了確定,這些都可以為L型液壓管流固耦合仿真模型在ANSYS Workbench中的建立提供有力的理論支撐和參考。(2)采用Pro/E三維軟件建模并導入ANSYS ICEM中,建立得到L型液壓管的有限元仿真模型,經(jīng)過仿真分析得到L型液壓管折彎部位和波紋管變截面外形部位是導致流固耦合振動的兩個主要因素;并通過搭建實驗驗證平臺驗證了所建立的仿真模型合理性。(3)對進口壓力是常數(shù)和進口壓力是連續(xù)脈沖時L型液壓波紋管的振動特性,并進行了影響分析,分析結(jié)果表明當進口壓力為連續(xù)壓力脈沖時,L型液壓波紋管更加劇烈。(4)最后提出了L型液壓波紋管降振方案,可將一層具有阻尼特性材料附著在L型液壓波紋管的內(nèi)壁處,在其他變量不變的前提下,通過仿真表明,所提出的方案能有效降低并穩(wěn)定L型液壓波紋管的液體流固耦合振動。
[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.
【學位授予單位】：湖南科技大學
【學位級別】：碩士
【學位授予年份】：2017
【分類號】：TH137.5

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