發(fā)布時(shí)間：2018-11-14 12:13

【摘要】：高速轉(zhuǎn)向架是機(jī)車車輛最重要的承載結(jié)構(gòu),轉(zhuǎn)向架的強(qiáng)度可靠性對(duì)機(jī)車整體安全性和運(yùn)行平穩(wěn)性具有重要的影響。高速轉(zhuǎn)向架是典型的焊接結(jié)構(gòu),焊接接頭是其最薄弱的環(huán)節(jié),接頭疲勞是常見的失效形式。焊接工藝設(shè)計(jì)及疲勞強(qiáng)度的評(píng)定成為保障高速轉(zhuǎn)向架焊接質(zhì)量的關(guān)鍵。本文針對(duì)企業(yè)實(shí)際需求,設(shè)計(jì)并開發(fā)了高速轉(zhuǎn)向架焊接工藝設(shè)計(jì)及接頭疲勞強(qiáng)度評(píng)定系統(tǒng)。首先,本文根據(jù)高速轉(zhuǎn)向架焊接工藝設(shè)計(jì)和疲勞強(qiáng)度評(píng)定工作的特點(diǎn),對(duì)系統(tǒng)知識(shí)進(jìn)行分類,并分別制定知識(shí)獲取方法和表達(dá)方式,形成了系統(tǒng)知識(shí)庫整體結(jié)構(gòu);根據(jù)焊接工藝設(shè)計(jì)及接頭疲勞強(qiáng)度評(píng)定問題求解的過程,設(shè)計(jì)了系統(tǒng)推理機(jī)的推理原則和流程;通過對(duì)系統(tǒng)整體功能分析完成了系統(tǒng)整體結(jié)構(gòu)設(shè)計(jì)。其次,根據(jù)高速轉(zhuǎn)向架焊接工藝設(shè)計(jì)的主要工作內(nèi)容,結(jié)合相關(guān)標(biāo)準(zhǔn)和經(jīng)驗(yàn)的研究,通過對(duì)焊接工藝規(guī)程相關(guān)參數(shù)確定方法的研究,形成了焊接工藝設(shè)計(jì)流程,并建立了工藝設(shè)計(jì)方案,通過多層次推理過程實(shí)現(xiàn)了對(duì)焊接工藝的設(shè)計(jì)。然后,本文根據(jù)焊接接頭疲勞強(qiáng)度名義應(yīng)力評(píng)定法原理,設(shè)計(jì)了系統(tǒng)疲勞強(qiáng)度評(píng)定的流程和模塊結(jié)構(gòu)。系統(tǒng)利用雨流計(jì)數(shù)法實(shí)現(xiàn)了對(duì)名義應(yīng)力譜的統(tǒng)計(jì),編制了接頭疲勞質(zhì)量等級(jí)匹配程序以獲取接頭S-N特征曲線,并最終實(shí)現(xiàn)不同疲勞評(píng)定計(jì)算方法對(duì)接頭疲勞強(qiáng)度的評(píng)定。最后,以保證系統(tǒng)知識(shí)庫的可擴(kuò)充性、準(zhǔn)確性和安全性為目標(biāo),設(shè)計(jì)了知識(shí)庫管理系統(tǒng)的實(shí)現(xiàn)方式和知識(shí)庫安全保障方法,建立了完整的系統(tǒng)知識(shí)庫管理體系,保證了系統(tǒng)知識(shí)庫持續(xù)學(xué)習(xí)和不斷完善的專家系統(tǒng)知識(shí)庫特性,使其能夠適應(yīng)高速轉(zhuǎn)向架焊接技術(shù)的新變化。
[Abstract]:High speed bogie is the most important bearing structure of locomotive and rolling stock. The strength reliability of bogie has an important influence on the overall safety and running stability of locomotive. High speed bogie is a typical welding structure, welding joint is the weakest link, joint fatigue is a common failure form. Welding process design and fatigue strength evaluation are the key to ensure welding quality of high speed bogie. In this paper, the welding process design and fatigue strength evaluation system of high speed bogie are designed and developed according to the actual demand of enterprises. Firstly, according to the characteristics of welding process design and fatigue strength assessment of high speed bogie, the system knowledge is classified, and the knowledge acquisition method and expression method are formulated respectively, forming the whole structure of system knowledge base. According to the process of welding process design and fatigue strength evaluation of joints, the reasoning principle and flow of the system inference machine are designed, and the whole system structure is designed by analyzing the whole function of the system. Secondly, according to the main work content of welding process design of high-speed bogie, combined with the research of relevant standards and experience, the welding process design flow is formed through the research on the determination method of the relevant parameters of welding process rules. The process design scheme is established, and the welding process design is realized by multi-level reasoning process. Then, according to the principle of nominal stress evaluation method of welded joint fatigue strength, the flow chart and module structure of fatigue strength evaluation system are designed. In this paper, the nominal stress spectrum statistics is realized by the rain flow counting method, and the fatigue quality grade matching program is compiled to obtain the S-N characteristic curve of the joint. Finally, the fatigue strength of the joint is evaluated by different fatigue evaluation calculation methods. Finally, in order to ensure the expansibility, accuracy and security of the system knowledge base, the realization mode of the knowledge base management system and the knowledge base security guarantee method are designed, and the complete system knowledge base management system is established. It ensures the continuous learning of the system knowledge base and the continuous improvement of the knowledge base characteristics of the expert system, so that it can adapt to the new changes of the welding technology of the high-speed bogie.
【學(xué)位授予單位】：南京航空航天大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2016
【分類號(hào)】：U270.64;TG44

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