發(fā)布時(shí)間：2018-08-10 20:01

【摘要】：機(jī)械產(chǎn)品失效從喪失功能的角度可以劃分為退化失效與突發(fā)失效,在壽命期內(nèi),這兩種失效模式之間存在競(jìng)爭(zhēng)關(guān)系,使產(chǎn)品最終發(fā)生競(jìng)爭(zhēng)失效。傳統(tǒng)的可靠性模型大多假設(shè)這兩種失效模式之間相互獨(dú)立,得到的可靠性評(píng)估結(jié)果將存在較大偏差。然而工程實(shí)際中,失效模式之間存在相互作用關(guān)系,當(dāng)前考慮失效模式相關(guān)的可靠性研究仍不夠充分。針對(duì)退化失效過(guò)程對(duì)突發(fā)失效過(guò)程的影響,以及沖擊所具有的衰減特性,分析失效模式之間的相關(guān)性,建立競(jìng)爭(zhēng)失效模型,用于產(chǎn)品可靠性評(píng)估。本文的主要研究成果如下:(1)從載荷工況出發(fā),由于疲勞載荷將使產(chǎn)品性能發(fā)生退化,性能退化進(jìn)一步發(fā)展成為退化失效,沖擊載荷會(huì)引發(fā)產(chǎn)品的突發(fā)破壞。把工程實(shí)際中的隨機(jī)載荷簡(jiǎn)化為疲勞載荷與沖擊載荷,分析疲勞載荷與沖擊載荷交替作用的工況,建立一種傳統(tǒng)的可靠性評(píng)估模型,來(lái)說(shuō)明傳統(tǒng)可靠性評(píng)估的建模方法。(2)考慮退化過(guò)程對(duì)沖擊過(guò)程的影響,分析其在兩個(gè)方面存在相關(guān):一方面表現(xiàn)為退化失效與突發(fā)失效受到同一沖擊過(guò)程的作用;另一方面表現(xiàn)為總退化量不僅影響沖擊出現(xiàn)的強(qiáng)度,而且影響沖擊出現(xiàn)時(shí)的幅值,利用Poisson過(guò)程對(duì)沖擊過(guò)程進(jìn)行描述,建立產(chǎn)品在相關(guān)模式下的競(jìng)爭(zhēng)失效可靠度模型。(3)針對(duì)產(chǎn)品突發(fā)失效過(guò)程中存在退化的現(xiàn)象,對(duì)該退化中的連續(xù)退化與突增退化進(jìn)行描述,并建立產(chǎn)品的突發(fā)失效過(guò)程模型。進(jìn)一步分析退化失效過(guò)程與突發(fā)失效過(guò)程之間的相關(guān)性:沖擊同時(shí)對(duì)退化失效和突發(fā)失效造成影響;以及退化失效過(guò)程使突發(fā)失效過(guò)程產(chǎn)生退化�；陔S機(jī)過(guò)程理論,推導(dǎo)產(chǎn)品在該相關(guān)模式下的競(jìng)爭(zhēng)失效可靠性模型。(4)針對(duì)經(jīng)受競(jìng)爭(zhēng)失效的機(jī)械產(chǎn)品其突發(fā)失效過(guò)程中沖擊存在衰減的現(xiàn)象,根據(jù)沖擊信號(hào)的衰減特性,提出基于衰減沖擊模型的競(jìng)爭(zhēng)失效可靠性分析計(jì)算方法。該方法首先考察具有周期性和隨機(jī)性特點(diǎn)的兩類衰減沖擊過(guò)程,利用指數(shù)函數(shù)描述其衰減規(guī)律,探討沖擊作用時(shí)所產(chǎn)生的沖量,在此基礎(chǔ)上構(gòu)建沖擊所造成的損傷與沖量之間的量化模型,通過(guò)Wiener過(guò)程對(duì)連續(xù)退化過(guò)程進(jìn)行描述,進(jìn)一步推導(dǎo)產(chǎn)品在失效相關(guān)模式下的競(jìng)爭(zhēng)失效可靠性分析模型�；谝陨夏Ｐ捅容^研究了考慮沖擊衰減與否對(duì)可靠性評(píng)估的差異,以說(shuō)明該方法的有效性。
[Abstract]:The failure of mechanical products can be divided into degradation failure and sudden failure from the point of view of loss of function. Most of the traditional reliability models assume that the two failure modes are independent of each other, and the results of reliability evaluation will be deviated greatly. However, in engineering practice, there is an interaction between failure modes, and the current reliability research considering failure mode is still insufficient. In view of the impact of degradation failure process on burst failure process and the attenuation characteristics of impact, the correlation between failure modes is analyzed, and a competitive failure model is established for product reliability evaluation. The main research results of this paper are as follows: (1) starting from the load condition, the fatigue load will degrade the product performance, the performance degradation will further develop into the degradation failure, and the impact load will lead to the sudden destruction of the product. The random load in engineering practice is simplified as fatigue load and impact load, and a traditional reliability evaluation model is established by analyzing the alternating action of fatigue load and impact load. (2) considering the influence of degradation process on impact process, analyzing its correlation in two aspects: on the one hand, it shows that degradation failure and burst failure are affected by the same impact process; On the other hand, the total degradation not only affects the intensity of impact, but also affects the amplitude of impact. The Poisson process is used to describe the impact process. The competitive failure reliability model of the product in the related mode is established. (3) the continuous degradation and the sudden degradation in the product burst failure process are described, and the burst failure process model of the product is established. The correlation between the degradation failure process and the burst failure process is further analyzed: the impact on both the degradation failure and the burst failure, and the degradation process which results in the degradation of the burst failure process. Based on the stochastic process theory, the competitive failure reliability model of the product in the relevant mode is derived. (4) according to the attenuation characteristics of the shock signal, the impact of the mechanical products subjected to competitive failure is attenuated during the sudden failure. A method for analyzing and calculating the reliability of competitive failure based on attenuated shock model is proposed. In this method, two kinds of attenuated shock processes with periodicity and randomness are investigated, and the law of attenuation is described by using exponential function, and the impulse produced by impact is discussed. On this basis, the quantitative model between damage and impulse caused by impact is constructed, and the continuous degradation process is described by Wiener process, and the model of competitive failure reliability analysis of products in failure related mode is further deduced. Based on the above models, the difference of reliability assessment considering shock attenuation or not is compared to illustrate the effectiveness of the method.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TB114.3;TH16

【參考文獻(xiàn)】

相關(guān)期刊論文 前10條

1 羅周全;陳杰;謝承煜;汪偉;劉曉明;;主溜井沖擊損傷機(jī)制分析及實(shí)測(cè)驗(yàn)證[J];巖土力學(xué);2015年06期

2 常春波;曾建潮;;極端沖擊下系統(tǒng)競(jìng)爭(zhēng)性失效過(guò)程的可靠性建模[J];系統(tǒng)工程理論與實(shí)踐;2015年05期

3 常春波;曾建潮;;δ沖擊條件下相關(guān)性競(jìng)爭(zhēng)失效過(guò)程的系統(tǒng)可靠性建模[J];振動(dòng)與沖擊;2015年08期

4 張英芝;牛序磊;申桂香;鄭珊;宋琪;;基于競(jìng)爭(zhēng)失效模式的數(shù)控機(jī)床可靠性建模[J];系統(tǒng)工程理論與實(shí)踐;2014年08期

5 張新鋒;趙彥;王生昌;王書(shū)振;;基于支持向量機(jī)的小樣本威布爾可靠性分析[J];機(jī)械科學(xué)與技術(shù);2012年08期

6 晁代宏;馬靜;陳淑英;張春熹;;基于性能退化的衛(wèi)星用光纖陀螺可靠性評(píng)估[J];紅外與激光工程;2011年09期

7 劉芳;趙建印;彭紹雄;;基于參數(shù)回歸分析的金屬化膜脈沖電容器競(jìng)爭(zhēng)失效分析[J];電子器件;2011年02期

8 蘇春;張恒;;基于性能退化數(shù)據(jù)和競(jìng)爭(zhēng)失效分析的可靠性評(píng)估[J];機(jī)械強(qiáng)度;2011年02期

9 蘇春;張燁;;基于Wiener過(guò)程和競(jìng)爭(zhēng)失效分析的系統(tǒng)可靠性評(píng)估(英文)[J];Journal of Southeast University(English Edition);2010年04期

10 雷宏剛;付強(qiáng);劉曉娟;;中國(guó)鋼結(jié)構(gòu)疲勞研究領(lǐng)域的30年進(jìn)展[J];建筑結(jié)構(gòu)學(xué)報(bào);2010年S1期

相關(guān)碩士學(xué)位論文 前1條

1 劉晗;基于Bayes理論的小子樣可靠性評(píng)定方法研究[D];國(guó)防科學(xué)技術(shù)大學(xué);2006年

，

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