本文選題：極端振動(dòng)環(huán)境 + 間歇故障��； 參考：《國防科學(xué)技術(shù)大學(xué)》2013年碩士論文

【摘要】：裝備間歇故障隨機(jī)性強(qiáng)、持續(xù)時(shí)間短,且難以發(fā)現(xiàn),危害很大。統(tǒng)計(jì)數(shù)據(jù)與失效分析表明,振動(dòng)環(huán)境應(yīng)力是導(dǎo)致裝備間歇故障主要原因之一,尤其在極端振動(dòng)環(huán)境中,振動(dòng)隨機(jī)性更強(qiáng)、應(yīng)力等級(jí)更高,間歇故障問題更加突出。如何在線診斷由極端振動(dòng)環(huán)境應(yīng)力引發(fā)的間歇故障是亟待解決的難點(diǎn)問題。論文針對(duì)極端振動(dòng)環(huán)境下裝備間歇故障頻發(fā)的問題,從極端振動(dòng)環(huán)境應(yīng)力分析的角度出發(fā),系統(tǒng)地分析極端振動(dòng)環(huán)境應(yīng)力誘發(fā)間歇故障模式的機(jī)理與規(guī)律,建立極端振動(dòng)環(huán)境、裝備組件累積損傷、間歇故障三者之間關(guān)聯(lián)關(guān)系,研究極端振動(dòng)環(huán)境下基于累積損傷和隱馬爾可夫模型(Hidden Markov Model,HMM)的間歇故障在線診斷方法。論文的主要研究內(nèi)容包括:1.極端振動(dòng)環(huán)境應(yīng)力誘發(fā)間歇故障機(jī)理與規(guī)律分析給出了本文所研究極端振動(dòng)環(huán)境的定義和裝備所承受極端振動(dòng)環(huán)境應(yīng)力的界定范圍;系統(tǒng)地分析了極端振動(dòng)環(huán)境應(yīng)力誘發(fā)間歇故障的機(jī)理和規(guī)律;以裝備中某連接組件為例,建立了極端振動(dòng)環(huán)境下的有限元仿真模型,分析了極端振動(dòng)環(huán)境應(yīng)力關(guān)鍵特征參數(shù)(極端振動(dòng)加速度均方根值、極端振動(dòng)頻率)對(duì)連接組件間歇性失效的影響。2.極端振動(dòng)環(huán)境誘發(fā)間歇故障關(guān)聯(lián)關(guān)系分析針對(duì)極端振動(dòng)環(huán)境應(yīng)力導(dǎo)致裝備組件快速累積損傷進(jìn)而導(dǎo)致間歇故障的機(jī)理,提出了極端振動(dòng)環(huán)境下基于彈塑性應(yīng)力理論的裝備組件累積損傷的計(jì)算方法;在此基礎(chǔ)上,建立了基于HMM的三態(tài)(正常態(tài)、間歇態(tài)、故障態(tài))損傷關(guān)聯(lián)關(guān)系模型,該模型描述了極端振動(dòng)環(huán)境應(yīng)力、組件損傷、組件間歇故障間的關(guān)聯(lián)關(guān)系。3.極端振動(dòng)環(huán)境下基于累積損傷的HMM間歇故障在線診斷方法針對(duì)極端振動(dòng)環(huán)境所誘發(fā)間歇故障時(shí)有時(shí)無的表現(xiàn)特點(diǎn),在基于HMM的三態(tài)損傷關(guān)聯(lián)關(guān)系模型的基礎(chǔ)上,從裝備組件各狀態(tài)表現(xiàn)特征和內(nèi)部累積損傷的角度入手,構(gòu)建了基于累積損傷的HMM間歇故障診斷模型,優(yōu)化設(shè)計(jì)了HMM間歇故障診斷模型參數(shù),提出了基于該模型的間歇故障實(shí)時(shí)診斷方法,對(duì)間歇故障進(jìn)行實(shí)時(shí)診斷。4.極端振動(dòng)環(huán)境間歇故障診斷技術(shù)驗(yàn)證與應(yīng)用以某直升機(jī)航向姿態(tài)系統(tǒng)為對(duì)象,設(shè)計(jì)并實(shí)現(xiàn)了具有關(guān)鍵部件累積損傷計(jì)算和間歇故障診斷能力的軟件,開展了極端振動(dòng)環(huán)境下的應(yīng)力試驗(yàn),并通過試驗(yàn)數(shù)據(jù)分析對(duì)本文所研究的間歇故障診斷方法的有效性進(jìn)行了驗(yàn)證與應(yīng)用。結(jié)果表明,本文所研究方法具有較好的間歇故障實(shí)時(shí)診斷效果。
[Abstract]:Equipment intermittent fault randomness, short duration, and difficult to find, great harm. The statistical data and failure analysis show that the vibration environment stress is one of the main causes of intermittent fault of equipment, especially in the extreme vibration environment, the vibration randomness is stronger, the stress grade is higher, and the intermittent fault problem is more prominent. How to diagnose intermittent faults caused by extreme vibration environment stress on line is a difficult problem to be solved. In this paper, the mechanism and law of intermittent faults induced by stress in extreme vibration environment are analyzed systematically from the point of view of stress analysis of extreme vibration environment, and the extreme vibration environment is established in view of the frequent occurrence of intermittent faults in equipment under extreme vibration environment. Based on cumulative damage and hidden Markov model (Hidden Markov Model HMMM) in extreme vibration environment, an on-line diagnosis method of intermittent faults based on cumulative damage and intermittent faults of equipment components is studied. The main contents of the thesis include: 1. The mechanism and law of intermittent failure induced by stress in extreme vibration environment are analyzed. The definition of extreme vibration environment studied in this paper and the definition range of extreme vibration environment stress of equipment are given. The mechanism and law of intermittent failure induced by stress in extreme vibration environment are systematically analyzed, and the finite element simulation model of a connection component in equipment is established. The influence of the key characteristic parameters of extreme vibration environment stress (mean square root value of extreme vibration acceleration and extreme vibration frequency) on intermittent failure of connection assembly is analyzed. The relationship Analysis of intermittent faults induced by extreme Vibration Environment aiming at the mechanism of rapid cumulative damage of equipment components caused by extreme vibration environmental stress, the mechanism of intermittent failure is analyzed. A method for calculating cumulative damage of equipment components based on elastic-plastic stress theory in extreme vibration environment is presented, and a damage correlation model of three states (normal, intermittent, fault) based on hmm is established. The model describes the relationship among extreme vibration environment stress, component damage and intermittent failure. An online diagnosis method for intermittent faults based on cumulative damage in extreme vibration environment aiming at the occasional characteristics of intermittent faults induced by extreme vibration environment, a three-state damage correlation model based on hmm is proposed. From the point of view of the state characteristics of equipment components and internal cumulative damage, the intermittent fault diagnosis model of hmm based on cumulative damage is constructed, and the parameters of hmm intermittent fault diagnosis model are optimized. This paper presents a real-time diagnosis method for intermittent faults based on this model. The technology of intermittent fault diagnosis in extreme vibration environment is verified and applied to a helicopter heading attitude system. A software with the capability of cumulative damage calculation of key components and intermittent fault diagnosis is designed and implemented. The stress test in extreme vibration environment is carried out, and the validity of the intermittent fault diagnosis method studied in this paper is verified and applied through the analysis of test data. The results show that the method studied in this paper has a good effect on the real-time diagnosis of intermittent faults.
【學(xué)位授予單位】：國防科學(xué)技術(shù)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2013
【分類號(hào)】：TH17
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本文編號(hào)：2043710