本文選題：大型礦用挖掘機(jī)　切入點(diǎn)：故障維修數(shù)據(jù)　出處：《電子科技大學(xué)》2015年碩士論文

【摘要】：大型礦用挖掘機(jī)作為礦山開采及工程施工中的重要工程機(jī)械,其應(yīng)用廣泛、創(chuàng)造價(jià)值高,代表了一個(gè)國(guó)家的礦山開采能力和整體技術(shù)水平,也反映了一個(gè)國(guó)家裝備制造業(yè)的總體水平。隨著世界經(jīng)濟(jì)的快速發(fā)展,露天礦山的開采規(guī)模也迅速擴(kuò)大,隨之出現(xiàn)的是大量的開采事故和挖掘機(jī)故障問題。因此,研究大型礦用挖掘機(jī)的可靠性問題,對(duì)提升我國(guó)礦山機(jī)械的國(guó)際競(jìng)爭(zhēng)力,保障國(guó)家礦產(chǎn)資源高效、安全的開發(fā)利用具有十分重要意義。本文從大型礦用挖掘機(jī)可靠性分析及設(shè)計(jì)關(guān)鍵技術(shù)項(xiàng)目出發(fā),重點(diǎn)研究了大型礦用挖掘機(jī)的可靠性評(píng)估與分配技術(shù),主要開展了以下幾個(gè)方面的研究工作:(1)在廣泛查閱相關(guān)文獻(xiàn)的基礎(chǔ)上,結(jié)合可靠性分析工作的需求,對(duì)大型礦用挖掘機(jī)及其子系統(tǒng)的的功能結(jié)構(gòu)進(jìn)行層次劃分,明確各個(gè)組部件的組成和功能,為開展可靠性分析及后續(xù)工作打下基礎(chǔ)。(2)從大型礦用挖掘機(jī)的設(shè)計(jì)和工作過程出發(fā),收集其故障維修數(shù)據(jù),進(jìn)行大型礦用挖掘機(jī)故障模式和影響分析(Failure Modes and Effects Analysis,FMEA),找出挖掘機(jī)各子系統(tǒng)所有可能出現(xiàn)的故障模式和失效機(jī)理,并分析故障原因及導(dǎo)致的不良后果,確定其在設(shè)計(jì)和制造過程中的薄弱環(huán)節(jié)、關(guān)鍵子系統(tǒng)和零部件等。(3)針對(duì)大型礦用挖掘機(jī)可靠性數(shù)據(jù)稀缺的問題,采用其故障維修數(shù)據(jù)進(jìn)行統(tǒng)計(jì)分析,并在此基礎(chǔ)上進(jìn)行可靠性評(píng)估工作。在對(duì)故障維修數(shù)據(jù)進(jìn)行分析處理后,統(tǒng)計(jì)故障間隔時(shí)間數(shù)據(jù),采取核密度估計(jì)方法進(jìn)行失效概率值計(jì)算,進(jìn)而估計(jì)分布函數(shù)的參數(shù)。在得到可靠性分布函數(shù)的基礎(chǔ)上,進(jìn)行可靠性指標(biāo)的制定和計(jì)算,完成對(duì)大型礦用挖掘機(jī)的可靠性評(píng)估工作。該評(píng)估方法直接基于客觀故障數(shù)據(jù),避免了以往方法的主觀因素影響,有較強(qiáng)的工程運(yùn)用價(jià)值。(4)結(jié)合大型礦用挖掘機(jī)故障模式和影響分析,對(duì)挖掘機(jī)的關(guān)鍵子系統(tǒng)和部件進(jìn)行可靠性分配。在對(duì)故障維修數(shù)據(jù)進(jìn)行分析處理的基礎(chǔ)上,統(tǒng)計(jì)出每個(gè)關(guān)鍵子系統(tǒng)和部件的故障頻率和平均維修時(shí)間(Mean Time To Repair,MTTR),并以此作為可靠性分配影響因素,計(jì)算分配因子,最后采用熵值法進(jìn)行加權(quán)計(jì)算。同時(shí)選取平均故障間隔時(shí)間(Mean Time Between Failure,MTBF)作為分配指標(biāo),完成對(duì)大型礦用挖掘機(jī)關(guān)鍵子系統(tǒng)和部件的可靠性分配,相比以往方法有更好的直觀性和簡(jiǎn)便性,更適合于實(shí)際工程中的運(yùn)用。
[Abstract]:As an important construction machinery in mining and engineering construction, large mining excavator is widely used and creates high value, which represents the mining capacity and overall technical level of a country. It also reflects the general level of a country's equipment manufacturing industry. With the rapid development of the world economy, the mining scale of open-pit mines has expanded rapidly, and a large number of mining accidents and excavator failures have followed. The study of the reliability of large excavators will improve the international competitiveness of mining machinery in China and ensure the high efficiency of national mineral resources. It is of great significance to develop and utilize safely. Based on the key technical items of reliability analysis and design of large mine excavators, this paper focuses on the reliability evaluation and distribution technology of large excavators. On the basis of extensive reference to relevant documents and the requirement of reliability analysis, the functional structure of large excavator and its sub-system is divided into different levels. Make clear the composition and function of each group, lay a foundation for reliability analysis and follow up work. (2) from the design and working process of large excavator, collect the data of fault maintenance. The failure mode and influence analysis of large mine excavator are carried out. The failure mode and failure mechanism of every subsystem of excavator are found out, and the causes of failure and the adverse consequences are analyzed. Determine its weak links in the process of design and manufacture, key subsystems and components, etc.) in view of the shortage of reliability data of large excavators, use its fault maintenance data for statistical analysis. After analyzing and processing the fault maintenance data, the fault interval time data are counted, and the failure probability value is calculated by using the kernel density estimation method. Then the parameters of the distribution function are estimated. Based on the reliability distribution function, the reliability index is worked out and calculated, and the reliability evaluation of large excavator is completed. The evaluation method is based on the objective fault data directly. It avoids the influence of subjective factors of previous methods and has strong engineering application value. 4) combined with fault mode and influence analysis of large mine excavators, The key subsystems and components of the excavator are assigned reliably. On the basis of the analysis and processing of the fault maintenance data, The failure frequency and average maintenance time of each key subsystem and component are calculated, and the distribution factor is calculated as the influence factor of reliability distribution. In the end, the entropy method is used to calculate the reliability of the key subsystems and components of the large mine excavator, and the mean Time Between failure time (MTBF) is chosen as the allocation index. Compared with the previous methods, the method is more intuitive and convenient, and more suitable for practical engineering.
【學(xué)位授予單位】：電子科技大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TD422.2

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本文編號(hào)：1657754