發(fā)布時(shí)間：2018-05-29 17:41

  本文選題：功能安全 + 失效模式��； 參考：《中國(guó)科學(xué)院研究生院（沈陽計(jì)算技術(shù)研究所）》2015年碩士論文

【摘要】：本課題以“高檔數(shù)控機(jī)床與基礎(chǔ)制造裝備”國(guó)家科技重大專項(xiàng)中“數(shù)控系統(tǒng)功能安全技術(shù)研究”子課題為依托,研究了數(shù)控裝置硬件平臺(tái)功能安全等級(jí)的定量評(píng)估方法,并對(duì)其硬件平臺(tái)實(shí)施了“評(píng)估-改進(jìn)-再評(píng)估”的迭代設(shè)計(jì)。論文主要包含以下幾項(xiàng)研究?jī)?nèi)容:失效分布確定、故障模式分析、安全評(píng)估建模以及電路優(yōu)化設(shè)計(jì)。確定失效分布類型時(shí),采用現(xiàn)場(chǎng)反饋數(shù)據(jù)繪制的裝置失效概率密度散點(diǎn)圖,與常見失效分布曲線進(jìn)行擬合,選出擬合程度最佳的分布曲線,即裝置所服從的失效分布類型;此后進(jìn)行故障模式分析,提出了基于數(shù)理統(tǒng)計(jì)的失效數(shù)據(jù)分析法,從而解決傳統(tǒng)故障影響分析時(shí)數(shù)據(jù)源難以獲取的問題;在上述工作的基礎(chǔ)上,選用兩種適用于指數(shù)失效的概率計(jì)算模型:基于故障樹的可靠性框圖法和離散馬爾科夫模型對(duì)數(shù)控裝置進(jìn)行安全評(píng)估建模,確定數(shù)控裝置所能達(dá)到的安全完整性等級(jí);最后基于安全評(píng)估結(jié)果,從影響系統(tǒng)失效的概率分布著手,對(duì)裝置硬件結(jié)構(gòu)在采購(gòu)、降額、診斷以及冗余四個(gè)方面進(jìn)行改進(jìn)設(shè)計(jì),以提升系統(tǒng)的安全性能。驗(yàn)證改進(jìn)后數(shù)控裝置硬件安全完整性等級(jí)達(dá)到預(yù)期目標(biāo)SIL2,實(shí)現(xiàn)改進(jìn)目的。通過完成以上幾部分工作,課題基本實(shí)現(xiàn)了國(guó)產(chǎn)數(shù)控裝置硬件平臺(tái)功能安全評(píng)估體系的構(gòu)建,在實(shí)際工程應(yīng)用上具有很高的操作性和可行性,為進(jìn)一步實(shí)現(xiàn)國(guó)產(chǎn)高安全性能的數(shù)控產(chǎn)品研制工作奠定了基礎(chǔ)。
[Abstract]:Based on the subtopic of "Research on functional Safety Technology of CNC system" in "High-grade CNC Machine tool and basic Manufacturing equipment", the quantitative evaluation method of functional safety grade of hardware platform of CNC device is studied. And implement the iterative design of the hardware platform "Evaluation-improvement-re-evaluation". This paper mainly includes the following research contents: failure distribution determination, fault mode analysis, safety evaluation modeling and circuit optimization design. When the failure distribution type is determined, the scattered plot of the device failure probability density drawn by the field feedback data is used to fit the common failure distribution curve, and the distribution curve with the best fitting degree is selected, that is, the failure distribution type followed by the device; After that, fault mode analysis is carried out, and failure data analysis method based on mathematical statistics is put forward to solve the problem that data sources are difficult to obtain in traditional fault impact analysis. Two probabilistic models suitable for exponential failure are selected: reliability block diagram method based on fault tree and discrete Markov model are used to model the safety evaluation of numerical control device to determine the level of safety integrity that can be achieved by numerical control device; Finally, based on the result of safety assessment, the paper designs the hardware structure of the device in four aspects, such as purchasing, reducing, diagnosing and redundancy, from the probability distribution that affects the failure of the system, so as to improve the safety performance of the system. Verify that the improved NC device hardware security integrity level to achieve the desired goal sill 2 to achieve the purpose of improvement. By completing the above several parts of the work, the subject has basically realized the construction of the function safety evaluation system of the hardware platform of the domestic numerical control device, which has high operability and feasibility in the practical engineering application. It lays a foundation for the development of CNC products with high safety performance.
【學(xué)位授予單位】：中國(guó)科學(xué)院研究生院（沈陽計(jì)算技術(shù)研究所）
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TG659

【參考文獻(xiàn)】

相關(guān)期刊論文 前7條

1 張?zhí)@薔;故障樹分析在電力系統(tǒng)可靠性研究中的應(yīng)用[J];華東電力;2005年02期

2 李浩;楊今云;;故障樹分析法在數(shù)控加工中心故障診斷中的應(yīng)用[J];機(jī)床電器;2006年03期

3 張英杰,韓慶瑤,賈桂紅;現(xiàn)代數(shù)控系統(tǒng)的特點(diǎn)和發(fā)展趨勢(shì)[J];中國(guó)制造業(yè)信息化;2004年09期

4 朱起悅;;應(yīng)用可靠性維修性工程軟件進(jìn)行FMEA分析[J];環(huán)境技術(shù);2008年06期

5 趙太平;;應(yīng)用故障樹分析法診斷數(shù)控車床故障[J];設(shè)備管理與維修;2007年01期

6 王太勇;喬志峰;韓志國(guó);董靖川;支勁章;;高檔數(shù)控裝備的發(fā)展趨勢(shì)[J];中國(guó)機(jī)械工程;2011年10期

7 陸中;孫有朝;;馬爾可夫分析在系統(tǒng)安全性評(píng)估中的應(yīng)用研究[J];中國(guó)民航大學(xué)學(xué)報(bào);2008年05期

，

本文編號(hào)：1951818