英文文獻(xiàn)翻譯學(xué) 生 姓 名：學(xué) 院：專 業(yè) 及 班 級(jí) ：學(xué) 號(hào)：指 導(dǎo) 教 師 ： 械可靠性設(shè)計(jì)方法及其研究應(yīng)用程序文摘基于可靠性測(cè)試和故障數(shù)據(jù)的統(tǒng)計(jì)分析,機(jī)械可靠性設(shè)計(jì)的基本任務(wù)為工程實(shí)踐提出mathematical-mechanical模型和方法。這樣的工作狀態(tài)和生活的機(jī)械產(chǎn)品在規(guī)定的工作條件下可以在設(shè)計(jì)階段預(yù)測(cè)。機(jī)械可靠性設(shè)計(jì)的內(nèi)涵和發(fā)展闡述了通過(guò)整合現(xiàn)代mathematical-mechanical理論。一系列的理論和方法,如機(jī)械可靠性設(shè)計(jì)、動(dòng)態(tài)可靠性設(shè)計(jì)、可靠性優(yōu)化設(shè)計(jì)、可靠性靈敏度設(shè)計(jì),可靠性穩(wěn)健設(shè)計(jì),清晰、系統(tǒng)地解釋道。基于特征的機(jī)械可靠性設(shè)計(jì),以及研究礦井提升機(jī)的可靠性設(shè)計(jì),以礦井提升機(jī)主軸軸承為例,論述了可靠性設(shè)計(jì)在礦井提升機(jī)中的應(yīng)用設(shè)計(jì)1.介紹科學(xué)技術(shù)的不斷發(fā)展使得更大的需求的產(chǎn)品,這不僅應(yīng)該更好的性能,但也更高的可靠性。在傳統(tǒng)的基礎(chǔ)上設(shè)計(jì),可靠性設(shè)計(jì)過(guò)程材料特性等參數(shù),尺寸部分,負(fù)載,力量和其他人是隨機(jī)變量服從一定的統(tǒng)計(jì)規(guī)律。此外,數(shù)學(xué)概率模型及其分布將會(huì)根據(jù)這個(gè)設(shè)計(jì)規(guī)則形成的。由于概率和統(tǒng)計(jì)理論和強(qiáng)度理論公式,在一定概率部分的損害條件也得到,從而他們的維度和生活在一定的可靠性計(jì)算,既滿足操作要求,有助于優(yōu)化設(shè)計(jì)的形成參數(shù)[1],或零件的可靠性和系統(tǒng)可以根據(jù)可靠性設(shè)計(jì)總結(jié)理論。因此,上述設(shè)計(jì)彌補(bǔ)了傳統(tǒng)設(shè)計(jì)的缺點(diǎn)和減少之間的距離設(shè)計(jì)程序和生產(chǎn)實(shí)踐。2.機(jī)械產(chǎn)品可靠性優(yōu)化設(shè)計(jì)的發(fā)展現(xiàn)狀可靠性優(yōu)化設(shè)計(jì)已成為優(yōu)化設(shè)計(jì)的一個(gè)重要分支。使用的機(jī)械零件,齒輪減速器。中國(guó)的可靠性優(yōu)化設(shè)計(jì)齒輪傳動(dòng)和行星齒輪傳動(dòng)的可靠性優(yōu)化設(shè)計(jì),等等的雷達(dá),通信的可靠性問(wèn)題和其他方面的機(jī)器已經(jīng)被提出中國(guó)在 1960 年代。經(jīng)濟(jì)快速發(fā)展和改革開(kāi)放的 1970 年代末推進(jìn)系統(tǒng)可靠性的關(guān)鍵部件的使用和民用項(xiàng)目。經(jīng)過(guò)多年的努力,可靠性軍事組件有兩個(gè)數(shù)量級(jí)。在 1980 年代,一群研究人員和技術(shù)的可靠性組織的骨干,建立在中國(guó),進(jìn)一步實(shí)現(xiàn)狀態(tài)可靠性工程部門(mén)已經(jīng)開(kāi)始。1990 年,中國(guó)的民用和軍用產(chǎn)品質(zhì)的飛躍,許多民用電器產(chǎn)品,使得產(chǎn)品質(zhì)量的可靠性達(dá)到了一個(gè)新的高在過(guò)去的 30 年里、優(yōu)化設(shè)計(jì)方法、機(jī)械產(chǎn)品的快速發(fā)展,在過(guò)去的 30 年里、優(yōu)化設(shè)計(jì)方法、機(jī)械產(chǎn)品的快速發(fā)展,特別是在機(jī)械產(chǎn)品的可靠性設(shè)計(jì)的發(fā)展,技術(shù)和實(shí)踐機(jī)械產(chǎn)品的工程實(shí)踐。人認(rèn)為機(jī)械產(chǎn)品的優(yōu)化設(shè)計(jì)可靠性是更合理的基礎(chǔ),因?yàn)樵趥鹘y(tǒng)機(jī)械產(chǎn)品比作為一個(gè)整體,性能的隨機(jī)性,在未來(lái)的工作。也就是說(shuō),一些參數(shù)的仿真機(jī)械產(chǎn)品作為隨機(jī)變量,基于可靠性的結(jié)構(gòu)優(yōu)化設(shè)計(jì)的機(jī)械產(chǎn)品可靠性要求的集成優(yōu)化設(shè)計(jì)的約束條件,或者到我們的目標(biāo)函數(shù)優(yōu)化設(shè)計(jì),即在某些可靠性指標(biāo)權(quán)重,降低機(jī)械產(chǎn)品的成本,或通過(guò)調(diào)整參數(shù)的機(jī)械產(chǎn)品,或下某些情況下,機(jī)械產(chǎn)品的最大重量和成本,通過(guò)調(diào)整參數(shù),零部件的可靠性。機(jī)械產(chǎn)品的主要需求不僅是安全的,可靠的和經(jīng)濟(jì)的合理性。因此,機(jī)械產(chǎn)品的優(yōu)化設(shè)計(jì),可以顯著提高設(shè)計(jì)的質(zhì)量和經(jīng)濟(jì)效益,機(jī)械產(chǎn)品的可靠性設(shè)計(jì)實(shí)證研究和探索的重要問(wèn)題在國(guó)內(nèi)外電流。然而,由于機(jī)械產(chǎn)品可靠性分析與大量的失效形式和其他相失效模式的問(wèn)題,可靠性更加困難,越來(lái)越復(fù)雜,因此,機(jī)械產(chǎn)品的可靠性設(shè)計(jì)變得更加困難。此外,最佳的解決方案算法被用來(lái)優(yōu)化設(shè)計(jì),也進(jìn)行了討論。因此,當(dāng)前的可靠性和水平優(yōu)化設(shè)計(jì)機(jī)械產(chǎn)品仍在開(kāi)發(fā)的早期階段[1]。3.機(jī)械產(chǎn)品可靠性高的優(yōu)點(diǎn)3.1.提高產(chǎn)品的使用率為了提高機(jī)械產(chǎn)品的可靠性,減少停機(jī)時(shí)間和維修人員,提高產(chǎn)品的利用率。現(xiàn)代機(jī)械產(chǎn)品的工作環(huán)境變得更加嚴(yán)重,從陸地、海洋和提供一個(gè)惡劣的環(huán)境空間的挑戰(zhàn),高可靠性,高安全性和系統(tǒng)的特征,系統(tǒng)集成和其他需要繼續(xù)很長(zhǎng)一段時(shí)間迫使系統(tǒng)必須有一個(gè)良好的可靠性。3.2.防止事故和故障的發(fā)生提高機(jī)械產(chǎn)品的可靠性,它可以防止事故和故障,特別是在為了避免災(zāi)難性事故的發(fā)生。1986 年挑戰(zhàn)者號(hào)航天飛機(jī)是美國(guó)海豹的失敗,起飛、爆炸 76 秒。造成經(jīng)濟(jì)損失 1.2 億美元。現(xiàn)代高新技術(shù)產(chǎn)品,因其嚴(yán)格的函數(shù)。3.3.明顯的技術(shù)和經(jīng)濟(jì)效益機(jī)械可靠性和優(yōu)化設(shè)計(jì)是基于概率理論和優(yōu)化設(shè)計(jì)參與機(jī)制的方法,應(yīng)用程序設(shè)計(jì),強(qiáng)度,和設(shè)計(jì)、材料的選擇和生活的失效分析,和許多其他設(shè)計(jì)變量和參數(shù),并提供明確的技術(shù)。和經(jīng)濟(jì)和可靠性指數(shù)也存在,目標(biāo)函數(shù)優(yōu)化模型和概率和非線性的特點(diǎn),非凸非線性,需要滿足各種隨機(jī)的約束。機(jī)械產(chǎn)品設(shè)計(jì)方法,根據(jù)產(chǎn)品不僅能保證工作產(chǎn)品的可靠性和安全性,功能,重量,體積小,成本和其他參數(shù)優(yōu)化、技術(shù)和經(jīng)濟(jì)效益明顯改善。4.機(jī)械產(chǎn)品的可靠性優(yōu)化設(shè)計(jì)這提出了可靠性優(yōu)化設(shè)計(jì)問(wèn)題。可靠性優(yōu)化設(shè)計(jì)主要考慮以下問(wèn)題:1.優(yōu)化設(shè)計(jì),可以根據(jù)不同的設(shè)計(jì)要求,選擇不同的特點(diǎn)函數(shù)作為目標(biāo)函數(shù)。2.設(shè)計(jì)變量。結(jié)構(gòu)的總體規(guī)模和大小的組件和機(jī)械性能,等,是最常見(jiàn)的機(jī)械部件的設(shè)計(jì)變量,需要優(yōu)化和決賽獨(dú)立參數(shù)優(yōu)化設(shè)計(jì)過(guò)程。在設(shè)計(jì)參數(shù)的確定隨機(jī)性和分布參數(shù)應(yīng)被視為反映的實(shí)際情況部分。3.約束條件。約束條件不僅可以限制在結(jié)構(gòu)參數(shù),但是也部分的功能,這需要參考常優(yōu)化設(shè)計(jì),根據(jù)具體情況來(lái)確定。在會(huì)議上減少可靠性的要求,或在會(huì)議成本,總成本的價(jià)值的尺寸、重量和其他指標(biāo),最大可靠性。因此,可靠性設(shè)計(jì)機(jī)械產(chǎn)品可分為兩種類(lèi)型的最優(yōu)可靠性的數(shù)學(xué)模型設(shè)計(jì)。可靠性作為目標(biāo)函數(shù)?？煽啃宰鳛榧s束條件5.機(jī)械零件的設(shè)計(jì)特點(diǎn)因?yàn)閴毫梢灾С植糠趾筒牧系膹?qiáng)度但隨機(jī)不確定值變量和不連續(xù)性,分布函數(shù)是數(shù)學(xué)中考慮。這是因?yàn)樨?fù)載,強(qiáng)度、尺寸和操作 alternativeness 的特性和統(tǒng)計(jì)特性[2],需要,因此概率和統(tǒng)計(jì)理論來(lái)分析和解決這個(gè)問(wèn)題。5.1.定量描述產(chǎn)品的失效概率和可靠性可以做到的眾所周知,設(shè)計(jì)的產(chǎn)品有一定的失敗概率,不能高于容許值中規(guī)定的技術(shù)文件。然而,可靠性設(shè)計(jì)可以提供產(chǎn)品的失效概率和可靠性定量。5.2.可以選擇各種可靠性指標(biāo)傳統(tǒng)的可靠性設(shè)計(jì)只有一個(gè)評(píng)價(jià)指標(biāo),即安全系數(shù)。通過(guò)相反,可靠性設(shè)計(jì)提供了各種和根據(jù)具體情況適當(dāng)?shù)乃饕龑?duì)于不同的產(chǎn)品,如失效概率、可靠性,沒(méi)有失敗的平均工作時(shí)間,firstfailure 駕駛英里(車(chē)輛)、可維護(hù)性、可用性等等。5.3.環(huán)境的影響考慮在內(nèi)由于很大的影響在壓力下面的環(huán)境因素如溫度、影響,地震、防潮、霧、侵蝕、灰塵、磨損,可靠性大大影響結(jié)果。,因此考慮到環(huán)境能更好地反映零件的實(shí)際操作6.機(jī)械產(chǎn)品的可靠性設(shè)計(jì)原則比起電動(dòng)產(chǎn)品,機(jī)械產(chǎn)品有自己的特點(diǎn)和方法設(shè)計(jì)和分析?？傊?機(jī)械產(chǎn)品的可靠性設(shè)計(jì)應(yīng)堅(jiān)持的原則(3、4),如下所示:6.1.可靠性設(shè)計(jì)與傳統(tǒng)設(shè)計(jì)的結(jié)合傳統(tǒng)的安全系數(shù)法直觀,簡(jiǎn)單,容易掌握,一個(gè)小工作負(fù)載可以保證機(jī)械零件的可靠性在大多數(shù)情況下。但目前是非常很難進(jìn)行傳統(tǒng)的機(jī)械產(chǎn)品可靠性設(shè)計(jì)在特殊的情況下。由于這個(gè)原因,它似乎是合理的和必要的改進(jìn)和完善傳統(tǒng)方法的幫助下概率設(shè)計(jì)。此外,可靠性概率設(shè)計(jì)旨在關(guān)鍵部分可以逐步進(jìn)行6.2.質(zhì)量和數(shù)量設(shè)計(jì)的集成數(shù)量設(shè)計(jì)指的是數(shù)量分析和計(jì)算的可靠性,但它不能解決所有問(wèn)題與可靠性有關(guān)。更重要的是,在某些時(shí)候,它是不合適的,甚至是不可能的為可靠性定量闡述了。從而需要集成的質(zhì)量和可靠性數(shù)量。至于部分的質(zhì)量要求和難以使數(shù)量計(jì)算,它更合理有效的進(jìn)行質(zhì)量設(shè)計(jì)。實(shí)踐證明,設(shè)計(jì)質(zhì)量扮演著一個(gè)很重要的角色,保證和提高機(jī)械產(chǎn)品的可靠性。,因此在可靠性設(shè)計(jì)的過(guò)程中,應(yīng)該綜合設(shè)計(jì)質(zhì)量和數(shù)量。6.3.并聯(lián)機(jī)械可靠性和耐用性在廣泛的意義上,機(jī)械產(chǎn)品的可靠性包括可靠性和耐用性。因此,相應(yīng)的機(jī)械可靠性設(shè)計(jì)包括上面提到的兩個(gè)。具體來(lái)說(shuō),可靠性設(shè)計(jì)是特定于偶爾的錯(cuò)誤,而耐久性是特定于漸進(jìn)的缺點(diǎn),和他們的錯(cuò)機(jī)制是不同的。6.4.并聯(lián)系統(tǒng)和零部件的可靠性考慮到機(jī)械零件的低 standarization 和普遍性程度和復(fù)雜功能狀態(tài)和結(jié)構(gòu),設(shè)計(jì)師必須做出一個(gè)全面的系統(tǒng)和部件的設(shè)計(jì)。零件強(qiáng)度基本保證系統(tǒng)可靠性和部分最基本單元的整體系統(tǒng)。在這種情況下,零件的設(shè)計(jì)應(yīng)該添加傳統(tǒng)可靠性設(shè)計(jì)。systematicreliability 設(shè)計(jì)的目的是為了實(shí)現(xiàn)協(xié)調(diào)和優(yōu)化的技術(shù)性能,重指數(shù),系統(tǒng)的制造成本和使用壽命,提供系統(tǒng)已經(jīng)滿足了可靠性指標(biāo)和實(shí)現(xiàn)預(yù)定的功能。7.可靠性設(shè)計(jì)的 Allication 礦井提升機(jī)礦井提升機(jī)的可靠性設(shè)計(jì)的關(guān)鍵是如何改變目前設(shè)備和參數(shù)有關(guān)(例如零部件的尺寸、強(qiáng)度、加載)通過(guò)實(shí)驗(yàn)數(shù)據(jù)統(tǒng)計(jì)最后得出其分布。此外,可靠性、維度和生活服務(wù)還可以計(jì)算一個(gè)接一個(gè)。起重機(jī)減速器和主軸結(jié)構(gòu)配有滾動(dòng)軸承,其壽命一個(gè)至關(guān)重要的對(duì)絞車(chē)的操作可靠性的影響。現(xiàn)在,在滾動(dòng)軸承的周期時(shí)間生命的租賃可以達(dá)到甚至超過(guò)材料疲勞極限的循環(huán)基地(約 107)。這是普遍采用有限的生命設(shè)計(jì)為了整個(gè)結(jié)構(gòu)合理化,減少其維度和重量,最后充分利用材料和提高零件的承載能力。的條件這周期 is106 和可靠性為 90%(即平等的幫助下負(fù)載的動(dòng)態(tài)負(fù)載評(píng)級(jí) C 滾動(dòng)軸承可以運(yùn)行 106 運(yùn)行,與此同時(shí) 90%的軸承不遭受疲勞點(diǎn)蝕故障[5])的設(shè)計(jì)和選擇執(zhí)行承載力。在前面分析的基礎(chǔ)上,滾動(dòng)軸承的可靠性設(shè)計(jì)主軸結(jié)構(gòu)滾動(dòng)軸承是vice-varying壓力。失敗的過(guò)程中操作的結(jié)果常規(guī)的壓力變化。由于壓力的長(zhǎng)期影響,表面金屬倒了滾動(dòng)體和內(nèi)部和外部的詳細(xì)信息。疲勞點(diǎn)蝕形成,也會(huì)導(dǎo)致疲勞失效。證明原件及設(shè)備或設(shè)備的壽命,所有的函數(shù)失敗了由于局部疲勞失效或故障,符合威布爾分布。所以是滾動(dòng)軸承。失效概率F可以描述為在上面,一個(gè) N 代表生命特征;N 周期,以 106 年為單位,為參數(shù)。可靠性可以制定為:對(duì)數(shù)后雙方的操作: 基于前面的分析,滾動(dòng)軸承的額定壽命是 10 L(即失效概率可靠性為 90%時(shí)是10%)。因此,額定壽命 在上面,90 N 時(shí)指的是周期的可靠性是 90%。(3)除以(4),結(jié)果就變成: 8.結(jié)論通過(guò)研究機(jī)械可靠性設(shè)計(jì)和結(jié)合礦井提升機(jī)的結(jié)構(gòu),它提出了可靠性設(shè)計(jì)的關(guān)鍵過(guò)程的應(yīng)用到礦井提升機(jī)如下。的首先是確定有關(guān)參數(shù)的統(tǒng)計(jì)數(shù)據(jù),然后建立故障數(shù)學(xué)模型,最后可以操作的可靠性設(shè)計(jì)。此外,礦井提升機(jī)的滾動(dòng)軸承被認(rèn)為是本研究的對(duì)象,同時(shí)軸承的疲勞壽命統(tǒng)計(jì),軸承的生活的規(guī)則符合威布爾分布是后天習(xí)得的。接下來(lái),根據(jù)滾動(dòng)軸承的額定壽命的效果是 10 L(即周期)90%的可靠性時(shí),軸承的壽命(循環(huán))計(jì)算根據(jù)給定的可靠性。一句話,這是極其有意義的提升時(shí)的可靠性的提高機(jī)械可靠性設(shè)計(jì)理論知識(shí)應(yīng)用到礦井提升機(jī)的設(shè)計(jì)的部分。引用[1]張曉琴,莫才頌.機(jī)械部件的可靠性設(shè)計(jì)分析[J].茂名雜志College,2008.1? ?91 - 93.[2]劉偉鑫。可靠性設(shè)計(jì)的機(jī)器。[M].北京:清華大學(xué)出版社,1996 年[3]孫偉,高聯(lián)華,姚新民等。機(jī)械產(chǎn)品的可靠性設(shè)計(jì)方法研究[J]。2007 年機(jī)械工業(yè)標(biāo)準(zhǔn)化 Design; Rolling Bearing1.IntroductionThe increasing development of science and technology has made greater requirements of products,which should be of not only better performance, but also higher reliability. On the basis of traditionaldesigns, the reliability design processes such parameters as material properties, dimension of parts, loads,strength and others to be random variables that comply with certain statistical law. Besides, mathematicalprobability model and its distribution will be formed according to this design rule. By virtue of probabilityand statistics theories and strength theory, the formula of probability for parts’ damage under givenconditions is also to be obtained and thereby their dimension and life under given reliability will becalculated, which both satisfies the operation requirements and helps with the formation of optimal designparameters[1], or the reliability of parts and system can be concluded according to the reliability designtheory. Therefore, the design mentioned above makes up for the disadvantages of the conventional designsand reduces the distance between design program and production practice.2.The Development Status of Reliability Optimization Design of Mechanical ProductsThe reliability-based optimization design has become an important branch of optimization design. Usedin the mechanical parts - gear, gear reducer. China has been the reliability-based optimization design ofgear transmission and the reliability-based optimization design of planetary gear transmission, etc. In thereliability of communication problem, radar, and other aspects of the machines have been put forward inChina in the 1960s. With the rapid economic development and reform and opening in the late 1970spropulsion system reliability of key components of use and civil items. After years of efforts, the reliabilityof military components has two orders of magnitude. In the 1980s, a group of researchers and technicalbackbone of the reliability of the organization, established in China, further implementation of stateministries of reliability engineering has begun. In 1990, China's civil and military products with aqualitative leap, many civil electrical products, has made such a reliability of the product quality hasreached a new high.In the past 30 years, optimization design method, the rapid development of mechanical products,especially in the development of the reliability design of mechanical products, technology and practical inengineering practice of mechanical products. People think that the optimal design of mechanical productsreliability is more reasonable basis, because in traditional mechanical products than by as a whole, theperformance of randomness, in the future work. That is to say, some parameters of the simulation ofmechanical products as random variables, in structure optimization design based on reliability, thereliability requirements of integration of mechanical products for optimization design of the constraintconditions, or into our target function optimization design, namely, in certain reliability index weight,reduce the cost of mechanical products, or by adjusting the parameters of mechanical products, or undercertain conditions, the maximum weight and cost of mechanical products by adjusting the parameters, thereliability of the parts. The main requirements of mechanical products are not only safe, reliable andeconomical rationality. Therefore, the optimization design of mechanical products, can significantlyimprove the design quality and economic benefit, the reliability design of mechanical products has becomean important problem in the empirical research and exploration in the domestic and foreign current.However, due to mechanical product reliability analysis is related to large amounts of invalidation formsand other relevant problems of failure modes, reliability more difficult, more and more complex, therefore,the reliability design of mechanical products is becoming more difficult. In addition, the optimal solutionalgorithm was used to optimize the design, is also discussed. Therefore, the current level of reliability andoptimal design of mechanical products is still in the early stages of development [1].3.The Advantages of High Reliability Mechanical Products3.1. Improve the Usage Rate of ProductTo improve the reliability of mechanical products, reduce downtime and maintenance personnel,improve product utilization. Modern machinery products work environment become more severe, andfrom the land, sea and provide a harsh environment space challenge, high reliability, high safety and thecharacteristics of the system, system integration and other needs to continue for a long time withoutforcing the system must have a good reliability.3.2.Prevent the Occurrence of Accidents and FailuresTo improve the reliability of mechanical products, it can prevent accidents and failure, especially inorder to avoid catastrophic accidents. The 1986 challenger space-shuttle is America's seal failure, aftertake-off, explosion 76 seconds. The economic loss caused by 120 million dollars. Modern high-techproduct, because its strict function.3.3.Obvious Technology and Economic BenefitsMechanical reliability and optimal design is based on probability theory and optimization designmethod, the application of participation mechanism design, strength, and the design, material selectionand life failure analysis, and many other design variables and parameters, and provide clear technology.And the economy and reliability index also exists, the objective function optimization model and thecharacteristics of probability and nonlinear, non-convex nonlinear, need to meet all kinds of randomconstraints. Mechanical product design method, according to the work product can not only ensure thereliability and safety of the product, the function, the weight, small volume, cost and other parameters areoptimized, technical and economic benefits have been markedly improved.4.Reliability Optimization Design of Mechanical ProductsThis puts forward the problem of reliability optimization design. Reliability optimization design mainlyconsiders the following questions:? With optimum design, can according to different design requirements, choose different characteristicfunction as the objective function.? Design variables. The overall size of the structure and size of components and mechanical properties,etc, are the most common design variables of mechanical components, is needed to optimize and finalindependent parameters optimized design process. In the determination of design parameters of therandomness and distribution parameters should be regarded as reflect the actual conditions of theparts.? Constraint conditions. Constraint conditions can be restrictions not only on structural parameters, butalso on a function of parts, this need refer to the conventional optimal design, according to thespecific circumstances to determine.In the meeting reduce the requirement of reliability, or in the meeting of the total cost of cost, the valueof size, weight and other indicators, the maximum reliability. Therefore, the reliability design ofmechanical products can be divided into two types of the mathematical model of optimum reliabilitydesign.? Reliability as the objective function.? Reliability as a constraint condition5.The Design Features of Mechanical Parts5.1.Stress and Strength Are Random VariablesBecause the stress that parts can support and materials’ strength are not certain values but randomvariables with discreteness, distribution function is taken into account in mathematics. It’s because loads,strength, dimension and operation have the characteristics of alternativeness and statistical property [2],and thus probability and statistics theories are needed to analyze and solve the problem.5.2.Quantitative Description of Products’ Failure Probability and Reliability Can Be DoneAs is known, the designed products have certain failure probability, which can not be above thepermissible value stated in the technical documents. However, the reliability design can provide products’failure probability and reliability quantitively5.3.Various Reliability Indexes Can Be ChosenThe traditional design has only one evaluation index for reliability, namely, safety coefficient. Bycontrast, the reliability design provides various and appropriate indexes according to the specific conditionsfor different products, such as failure probability, reliability, non–failure working time on average, firstfailuredriving miles(for vehicles), maintainability, availability and so on.5.4.The Effect of Environment Is Taken into ConsiderationOwing to the great influence on stress of the following surroundings factors such as temperature,impact, quake, moisture, mist, erosion, dust, and abrasion, reliability is considerably affected consequently.And thus taking environment into consideration can reflect parts’ actual operation better6.The Reliability Design Priciples of Mechanical ProductsCompared with electric products, mechanical products have their own characteristics and ways ofdesign and analysis. To sum up, the reliability design of mechanical products should stick to the principlesas follows [3, 4]:6.1.Combination of Reliability Design and Traditional DesignThe traditional safety coefficient method which is intuitive, simple and easy to master and has a smallworkload can ensure the reliability of mechanical parts under most circumstances. But at present it is verydifficult to carry out traditional reliability design of mechanical products in special cases. For this reason, itseems reasonable and necessary to improve and perfect the traditional method with the help of probabilitydesign. Moreover, the reliability probability design aimed to crucial parts can be gradually performed6.2.Integration of Quality and Quantity DesignQuantity design refers to the quantity analysis and calculation of reliability, but it can not solve all theproblems concerned with reliability. What’s more, at some times, it is inappropriate and even impossiblefor reliability to expound quantitively. And thereby the reliability requires the integration of the quality andquantity. As for the parts which have the quality requirements and are difficult to make quantity calculation,it is more reasonable and effective to conduct quality design. Practice has proved that the quality designplays an important role in assuring and improving the reliability of mechanical products. And thus duringthe process of reliability design, quality and quantity design should be integrated.6.3. Paralleling of Mechanical Reliability and DurabilityIn a broad sense, the reliability of mechanical products includes reliability and durability. Therefore,mechanical reliability design accordingly comprises the two mentioned above. Specifically speaking,reliability design is specific to occasional faults, while durability is specific to gradual faults, and their faultmechanism are different.6.4.Paralleling of System and Parts ReliabilityGiven that mechanical parts are of lower standarization and universality degree and have complexfunctional status and structure, the designers have to make a comprehensive design of system and parts.The parts strength is basic guarantee of systematic reliability and parts are the most basic unit of the wholesystem. In this case, parts’ design should add reliability design to the traditional one. The aim of systematicreliability design is to achieve the coordination and optimization of technical performance, weight index,manufacturing cost and service life of the system, providing that the system has satisfied the establishedreliability index and realized predetermined functions.7.The Allication of Reliability Design in Mine HoistThe key to the reliability design in mine hoist is how to change equipments at present and parametersconcerned (for instance the parts’ dimension, strength and loading) into statistics through experimental dataand finally conclude its distribution. Furthermore, the reliability, dimension and life service can also becalculated one after one.The decelerator and spindle structure in the hoist are equipped with rolling bearing, whose life span hasa vital impact on the operation reliability of the hoist. Now that the cycle times of rolling bearing duringthe lease of life can reach up to and even exceed the cycle base of material fatigue limit (about 107). It iscommon to adopt limited life design in order to rationalize the whole structure, reduce its dimension andweight, and at last make the best of materials and improve the bearing capacity of parts. On the conditionthat cycles is106and reliability is 90%(namely, with the help of equal load of dynamic load rating C, therolling bearing can run 106runs, and in the meanwhile 90% of the bearing does not suffer from fatiguepitting failure [5] )the design and choice of bearing capacity is executed.On the basis of the previous analysis, the reliability design of rolling bearing in spindle structure is tobe made.The rolling bearing stands vice-varying stress. The failure in the course of operation results from theregular changes of the stress. Because of the long-term effect of the stress, the surface metals fall downfrom both rolling body and inner and outer raceways. Fatigue pitting comes into being and also leads tofatigue failure. It is proved that the life span of the original and device or equipments, of all whosefunctions have failed due to partial fatigue failure or fault, is in line with Weibull distribution. So is that ofrolling bearing. The failure probability F can be described as:In the above, a N stands for characteristic life; N for cycles, with 106 as the unit; m for the parameter.Reliability can be formulated as:After logarithm operation on both sides:Based upon the preceding analysis, the rated life of rolling bearing is 10 L (that is, the failure probabilityis 10%) when the reliability is 90%. Thus the rated life isIn the above, 90 N refers to the cycles when the reliability is 90%.Divide (3) by (4), the result becomes:8.ConclusionThrough the study on mechanical reliability design and combination with the structure of mine hoist, itis proposed that the crucial procedure of reliability design’s application into mine hoist is as follows. Thefirst is to ascertain the statistics of the relevant parameters, then to set up the failure mathematical model,and finally the reliability design can be operated. Besides, the rolling bearing of mine hoist is regarded asthe object of this study, meanwhile bearing’s fatigue life as statistics, from which the rule that bearing’s lifeaccords with Weibull distribution is learned. Next, based on the result that the rated life of rooling bearingis 10 L (that is cycle) when the reliability is 90%, the bearing’s life (cycle) is calculated according to thegiven reliability. In a word, it is extremely meaningful for the improvement of hoist’s reliability when thetheoretical knowledge about mechanical reliability design is applied into the design of mine hoist’ parts.References[1] Zhang Xiaoqin, Mo Cai Song. Reliability Design Analysis of Mechanical Components [J] Journal of MaomingCollege, 2008?1??91-93.[2] Liu Weixin. Reliability Design of Machines.[M] Beijing: Tsinghua University Press, 1996[3] Sun Wei, Gao Lianhua, Yao Xinmin et al. The Research on Reliability Design Methods of Machine Products[J].Machinery Industry Standardization &Quality, 2007?8??14-17.[4] Xiang Yizhou, Chen Ge, Ding Liyu. The Reliability Design and Trial of Machine Product[J] Jo