本文選題：預應力 + 基于實例推理��； 參考：《湘潭大學》2015年碩士論文

【摘要】：預應力加工是一種通過在切削前預先施加預應力就能控制工件表面殘余應力的高效加工方法,它對高強度合金特別是高溫合金的加工正受到越來越廣泛的關(guān)注,因為相對于其它改善工件表層殘余應力的方法,預應力切削加工方法具有工藝簡單、節(jié)省時間和成本,且加工后不會產(chǎn)生額外的加工表面硬化等優(yōu)點,但是一直以來,高強度合金的預應力切削加工由于缺乏專業(yè)工藝數(shù)據(jù)庫的指導,零件加工質(zhì)量不穩(wěn)定。本文在了解了預應力加工方法和數(shù)據(jù)庫系統(tǒng)用戶的需求后,針對高強度合金的車削加工,建立了預應力車削加工工藝數(shù)據(jù)庫系統(tǒng),將高強度合金的預應力車削加工的實驗數(shù)據(jù)、有限元模擬數(shù)據(jù)和離散元模擬數(shù)據(jù)加以結(jié)合,并通過基于實例推理方法,使這些數(shù)據(jù)能在符合用戶需求的基礎(chǔ)上傳遞給用戶。在建立預應力車削加工工藝數(shù)據(jù)庫系統(tǒng)的過程中,本文主要描述了如下問題:1.研究了預應力車削加工工藝數(shù)據(jù)庫系統(tǒng)的整體設(shè)計,通過對預應力切削加工數(shù)據(jù)結(jié)構(gòu)的研究以及用戶的需求分析,得到了整個系統(tǒng)的框架結(jié)構(gòu),系統(tǒng)參量的設(shè)計模型和系統(tǒng)能實現(xiàn)的功能。2.采用了基于實例推理(Case-based Reasoning,CBR)的推理方法,研究了采用最近鄰居法和局部相似度計算進行實例檢索的過程,描述了實例重用后的實例修改及實例保存,實現(xiàn)了預應力切削加工數(shù)據(jù)庫系統(tǒng)進行自學習的功能。3.研究了預應力切削加工數(shù)據(jù)庫系統(tǒng)整體的推理流程和預應力知識的實例表達方法以及實例庫的建立,分析了如何利用最近鄰居法和局部相似度在配合權(quán)值分配的情況下進行預應力加工實例的檢索,闡述了現(xiàn)階段預應力切削加工實例重用后的修改方法,以及人工干預修改方法采用上的優(yōu)點與不足。4.在研究了預應力切削加工的整體結(jié)構(gòu)以及實例庫的建立細節(jié)后,經(jīng)過開發(fā)語言和數(shù)據(jù)庫管理系統(tǒng)的選取,開發(fā)了預應力切削加工的人機交互界面,實現(xiàn)了用戶進行預應力工藝查詢、有限元模擬數(shù)據(jù)查詢和離散元模擬數(shù)據(jù)查詢,同時設(shè)計了管理員界面,使其能夠進行用戶管理及預應力加工工藝實例、有限元模擬數(shù)據(jù)實例和離散元模擬數(shù)據(jù)實例的添加,使數(shù)據(jù)庫系統(tǒng)實例能通過管理員的添加實現(xiàn)主動增長。
[Abstract]:Pre-stress machining is a kind of high-efficiency machining method which can control the residual stress of workpiece surface by prestressing before cutting. The machining of high-strength alloys, especially superalloys, is receiving more and more attention. Compared with other methods to improve surface residual stress of workpiece, prestress cutting method has the advantages of simple process, saving time and cost, and no additional surface hardening after machining, but all the time, The machining quality of high strength alloy is unstable due to the lack of professional process database. Based on the understanding of the pre-stress processing method and the needs of the users of the database system, a pre-stress turning process database system is established for the turning of high-strength alloys, and the experimental data of pre-stress turning of high-strength alloys are put forward in this paper. The finite element simulation data and the discrete meta-simulation data are combined and the data can be transferred to the user on the basis of the user's demand through the method of case-based reasoning. In the process of establishing the database system of prestressed turning process, this paper mainly describes the following question: 1. 1. The whole design of the database system of pre-stressed turning process is studied. The frame structure of the whole system is obtained by studying the data structure of pre-stress cutting and analyzing the needs of users. Design model of system parameters and function of system. 2. 2. The reasoning method based on Case-based reasoning (CBR) is used to study the process of case retrieval using nearest neighbor method and local similarity calculation. The case modification and case preservation after case reuse are described. The function of self-learning of prestressing cutting database system is realized. 3. In this paper, the reasoning flow of the database system of prestressing cutting process, the method of case representation of prestress knowledge and the establishment of case library are studied. This paper analyzes how to use the nearest neighbor method and the local similarity to retrieve the pre-stressed machining cases under the condition of matching the weight distribution, and expounds the modified method of reusing the pre-stressed machining cases at the present stage. And the advantages and disadvantages of artificial intervention modification method. 4. After studying the whole structure of prestress cutting and the details of the establishment of case library, the man-machine interface of prestressed cutting is developed through the selection of development language and database management system. The prestressing process query, finite element simulation data query and discrete meta-simulation data query are realized. At the same time, the administrator interface is designed to enable the user to manage and prestress process examples. The addition of finite element simulation data instances and discrete meta-simulation data instances enables the database system instances to grow actively through the addition of administrators.
【學位授予單位】：湘潭大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TG51;TP311.13

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