【摘要】：飛機蓄壓油箱是飛機倒飛時的主要供油部件,且由于長期交變載荷的作用,可能會引起油箱的疲勞破壞,造成燃油泄漏,影響飛機的飛行安全。故設(shè)計完成后,都要對其進行地面耐振試驗驗證其疲勞強度,其中定頻耐振試驗是工程中常用方法。本文課題來源為某飛機工業(yè)(集團)有限公司,針對耐振試驗?zāi)承╊l率下出現(xiàn)嚴(yán)重抖動的問題,對其進行動力學(xué)仿真分析,研究蓄壓油箱的振動疲勞壽命。本文主要工作包括:1.利用有限元前處理軟件詳細建立振動試驗系統(tǒng)的有限元模型,包括油箱支臂、綁帶、油箱、底座、隔震橡膠等及其相互連接關(guān)系。同時采用聲固耦合法考慮了液體燃油的影響,建立其聲學(xué)流體模型。2.提取蓄壓油箱的結(jié)構(gòu)和流固耦合模態(tài),通過對比說明液體對結(jié)構(gòu)動力特性有重要的影響,進而對試驗系統(tǒng)進行流固耦合模態(tài)分析,獲得系統(tǒng)的動態(tài)特性,并與模態(tài)試驗結(jié)果進行對比,驗證有限元模型的準(zhǔn)確性。3.依據(jù)試驗載荷譜,對耦合系統(tǒng)進行諧響應(yīng)分析,獲得振動系統(tǒng)的應(yīng)力分布,驗證各零部件的耐振強度。同時找出蓄壓油箱疲勞壽命的薄弱部位,為后續(xù)疲勞分析做準(zhǔn)備。4.對蓄壓油箱定頻耐振試驗13種載荷工況造成的損傷在頻域內(nèi)進行計算和累加,獲得蓄壓油箱一個試驗循環(huán)的疲勞損傷,根據(jù)損傷等效原理預(yù)測蓄壓油箱的實際使用壽命。本文的研究工作具有如下創(chuàng)新性:采用對所有節(jié)點的損傷進行累加計算的方法,對工程中常用的定頻耐振試驗的疲勞壽命進行了仿真分析,而目前關(guān)于定頻振動疲勞的預(yù)測方法還未見報道。
[Abstract]:Aircraft pressure storage tank is the main fuel supply part of aircraft when flying upside down, and because of long-term alternating load, it may cause fatigue damage of fuel tank, cause fuel leakage and affect flight safety of aircraft. After the design is completed, the fatigue strength should be verified by the ground vibration test, and the constant frequency vibration test is a common method in engineering. The subject of this paper is an aircraft Industry (Group) Co., Ltd. The vibration fatigue life of the storage tank is studied by means of dynamic simulation and analysis, aiming at the problem of serious jitter at certain frequencies in the vibration test of a certain aircraft industry (group) Co., Ltd. The main work of this paper is as follows: 1. The finite element model of vibration test system is established by finite element pre-processing software, including fuel tank arm, strap, tank, base, isolation rubber and so on. At the same time, the influence of liquid fuel was considered by sound-solid coupling method, and its acoustic fluid model was established. 2. The structure and fluid-solid coupling modes of the storage tank are extracted, and the liquid has an important influence on the dynamic characteristics of the structure. Then the fluid-solid coupling mode analysis of the experimental system is carried out, and the dynamic characteristics of the system are obtained. The accuracy of the finite element model is verified by comparing with the modal test results. 3. According to the experimental load spectrum, the harmonic response analysis of the coupling system is carried out, the stress distribution of the vibration system is obtained, and the vibration resistance strength of each component is verified. At the same time, find out the weak parts of the fatigue life of the storage tank, and prepare for the subsequent fatigue analysis. 4. The damage caused by 13 load conditions is calculated and accumulated in frequency domain, and the fatigue damage of a test cycle of the storage tank is obtained. According to the principle of damage equivalence, the actual service life of the storage tank is predicted. The research work in this paper is innovative as follows: the fatigue life of the constant frequency vibration test is simulated and analyzed by using the method of cumulative calculation of the damage of all nodes in the engineering. At present, the prediction method of constant frequency vibration fatigue has not been reported.
【學(xué)位授予單位】：沈陽航空航天大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：V228.11

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