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  本文關(guān)鍵詞：基于Gamma過程的關(guān)節(jié)軸承加速可靠性驗證方法　出處：《國防科學(xué)技術(shù)大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 關(guān)節(jié)軸承 加速可靠性驗證 優(yōu)化設(shè)計 Gamma 過程 BS 分布 Monte Carlo 仿真

【摘要】：關(guān)節(jié)軸承是一種特殊結(jié)構(gòu)的滑動軸承,具有結(jié)構(gòu)簡單、承載大和自調(diào)心的特點,在航空航天、工程機械等領(lǐng)域應(yīng)用廣泛。關(guān)節(jié)軸承在使用過程中由于磨損使得徑向間隙增大而失效,導(dǎo)致操縱部件精度降低、控制失效,甚至給整個裝備帶來災(zāi)難性后果�？煽啃则炞C能夠通過試驗檢驗關(guān)節(jié)軸承的可靠性是否達(dá)到要求水平,確保設(shè)計生產(chǎn)出來的成品滿足既定的可靠性要求,對裝備的可靠安全運行具有非常重要的意義。造成關(guān)節(jié)軸承失效的主要原因為磨損,在正常工況下軸承磨損失效的時間很長,若采用傳統(tǒng)可靠性驗證方法驗證關(guān)節(jié)軸承可靠性指標(biāo),工程中難以實施,因而需要引入加速退化試驗技術(shù)開展可靠性驗證方法研究,以解決傳統(tǒng)驗證試驗效率不高的問題。本文通過引入加速退化試驗提高試驗效率,并利用Gamma過程描述關(guān)節(jié)軸承的退化過程,建立了基于Gamma過程的加速可靠性驗證方法,為關(guān)節(jié)軸承的可靠性驗證提供技術(shù)支撐。本文主要研究內(nèi)容如下:(1)分析了關(guān)節(jié)軸承的退化失效過程,重點討論了關(guān)節(jié)軸承的失效機理。在此基礎(chǔ)上,建立了關(guān)節(jié)軸承加速可靠性試驗的退化模型、加速模型等主要模型,提出了Gamma過程的K-S檢驗方法。(2)提出了基于Gamma過程的加速可靠性試驗方案的設(shè)計方法,通過預(yù)試驗獲取先驗信息及對可靠性指標(biāo)進(jìn)行轉(zhuǎn)化,實現(xiàn)可靠性驗證試驗方案的設(shè)計。仿真結(jié)果表明,利用本文方法對具有單調(diào)退化過程的退化型產(chǎn)品進(jìn)行可靠性驗證,在較短的時間內(nèi)能夠給出可信度較高的驗證結(jié)果。(3)引入BS分布描述產(chǎn)品的累計失效分布,對可靠性驗證試驗方案優(yōu)化問題進(jìn)行描述并建立了優(yōu)化模型。提出了驗證試驗方案的優(yōu)化方法,為關(guān)節(jié)軸承加速可靠性試驗的順利實施奠定基礎(chǔ)。Monte Carlo仿真評價表明優(yōu)化試驗方案可以有效提高驗證結(jié)果精度。(4)針對某型關(guān)節(jié)軸承實施了加速可靠性驗證試驗,對所提出的可靠性指標(biāo)進(jìn)行了有效驗證。結(jié)果表明,采用Gamma過程描述關(guān)節(jié)軸承磨損退化過程是準(zhǔn)確、合理的。通過考慮先驗信息偏差對基本驗證試驗方案進(jìn)行優(yōu)化,更符合實際情況,所得驗證結(jié)果更準(zhǔn)確,從而驗證了本文方法的可行性和有效性。綜上所述,論文從理論分析、仿真驗證和工程應(yīng)用等方面系統(tǒng)研究了關(guān)節(jié)軸承加速可靠性驗證中的建模與方案設(shè)計問題,并在此基礎(chǔ)上提出了基于Gamma過程的關(guān)節(jié)軸承加速可靠性驗證方法。本文研究成果對加速試驗技術(shù)在關(guān)節(jié)軸承可靠性驗證中的研究應(yīng)用具有重要的借鑒意義。
[Abstract]:Joint bearing is a special structure of sliding bearing, with simple structure, bearing large and self-centring characteristics in aerospace. Joint bearings are widely used in the field of construction machinery. The radial clearance increases due to wear, which leads to the reduction of the precision of the control parts and the failure of control. Reliability verification can test whether the reliability of the joint bearings reaches the required level and ensure that the finished products designed and produced meet the established reliability requirements. It is very important for the reliable and safe operation of the equipment. The main reason for the failure of the joint bearing is wear, and the bearing wear failure time is very long under normal working conditions. If the traditional reliability verification method is used to verify the reliability index of the joint bearing, it is difficult to implement in the engineering, so it is necessary to introduce the accelerated degradation test technology to carry out the reliability verification research. In order to solve the problem that the efficiency of traditional verification test is not high, this paper improves the test efficiency by introducing accelerated degradation test, and describes the degradation process of joint bearing by Gamma process. An accelerated reliability verification method based on Gamma process is established to provide technical support for reliability verification of joint bearings. The main contents of this paper are as follows: 1) the degradation failure process of joint bearings is analyzed. The failure mechanism of joint bearing is discussed in detail. On this basis, the degradation model, acceleration model and other main models of accelerated reliability test of joint bearing are established. The K-S test method of Gamma process is put forward. The design method of accelerated reliability test scheme based on Gamma process is presented. The design of the reliability verification test scheme is realized by obtaining the prior information and transforming the reliability index through the pre-test. The simulation results show that. The method is used to verify the reliability of degraded products with monotone degradation process. In a short time, the reliability of the verification results can be given. 3) the introduction of BS distribution to describe the cumulative failure distribution of the product. The optimization problem of reliability test scheme is described and the optimization model is established. It lays a foundation for the successful implementation of the joint bearing accelerated reliability test. Monte Carlo simulation evaluation shows that the optimized test scheme can effectively improve the accuracy of the verification results. An accelerated reliability verification test is carried out for a certain type of joint bearing. The results show that it is accurate to use Gamma process to describe the wear degradation process of joint bearing. Reasonable. By considering the prior information deviation to optimize the basic verification test scheme, it is more in line with the actual situation, and the verification results are more accurate, which verifies the feasibility and effectiveness of this method. In this paper, the modeling and scheme design of joint bearing accelerated reliability verification are systematically studied from the aspects of theoretical analysis, simulation verification and engineering application. On this basis, an accelerated reliability verification method of joint bearing based on Gamma process is proposed. The research results in this paper have important reference for the research and application of accelerated test technology in the reliability verification of joint bearing. Righteousness.
【學(xué)位授予單位】：國防科學(xué)技術(shù)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TB114.3;TH133.31

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相關(guān)博士學(xué)位論文 前1條

1 譚源源;裝備貯存壽命整機加速試驗技術(shù)研究[D];國防科學(xué)技術(shù)大學(xué);2010年

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本文編號：1378142