本文選題：預(yù)應(yīng)力 + 基于實(shí)例推理�。� 參考：《湘潭大學(xué)》2015年碩士論文

【摘要】：預(yù)應(yīng)力加工是一種通過(guò)在切削前預(yù)先施加預(yù)應(yīng)力就能控制工件表面殘余應(yīng)力的高效加工方法,它對(duì)高強(qiáng)度合金特別是高溫合金的加工正受到越來(lái)越廣泛的關(guān)注,因?yàn)橄鄬?duì)于其它改善工件表層殘余應(yīng)力的方法,預(yù)應(yīng)力切削加工方法具有工藝簡(jiǎn)單、節(jié)省時(shí)間和成本,且加工后不會(huì)產(chǎn)生額外的加工表面硬化等優(yōu)點(diǎn),但是一直以來(lái),高強(qiáng)度合金的預(yù)應(yīng)力切削加工由于缺乏專(zhuān)業(yè)工藝數(shù)據(jù)庫(kù)的指導(dǎo),零件加工質(zhì)量不穩(wěn)定。本文在了解了預(yù)應(yīng)力加工方法和數(shù)據(jù)庫(kù)系統(tǒng)用戶(hù)的需求后,針對(duì)高強(qiáng)度合金的車(chē)削加工,建立了預(yù)應(yīng)力車(chē)削加工工藝數(shù)據(jù)庫(kù)系統(tǒng),將高強(qiáng)度合金的預(yù)應(yīng)力車(chē)削加工的實(shí)驗(yàn)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(guò)基于實(shí)例推理方法,使這些數(shù)據(jù)能在符合用戶(hù)需求的基礎(chǔ)上傳遞給用戶(hù)。在建立預(yù)應(yīng)力車(chē)削加工工藝數(shù)據(jù)庫(kù)系統(tǒng)的過(guò)程中,本文主要描述了如下問(wèn)題:1.研究了預(yù)應(yīng)力車(chē)削加工工藝數(shù)據(jù)庫(kù)系統(tǒng)的整體設(shè)計(jì),通過(guò)對(duì)預(yù)應(yīng)力切削加工數(shù)據(jù)結(jié)構(gòu)的研究以及用戶(hù)的需求分析,得到了整個(gè)系統(tǒng)的框架結(jié)構(gòu),系統(tǒng)參量的設(shè)計(jì)模型和系統(tǒng)能實(shí)現(xiàn)的功能。2.采用了基于實(shí)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(jì)算進(jìn)行實(shí)例檢索的過(guò)程,描述了實(shí)例重用后的實(shí)例修改及實(shí)例保存,實(shí)現(xiàn)了預(yù)應(yīng)力切削加工數(shù)據(jù)庫(kù)系統(tǒng)進(jìn)行自學(xué)習(xí)的功能。3.研究了預(yù)應(yīng)力切削加工數(shù)據(jù)庫(kù)系統(tǒng)整體的推理流程和預(yù)應(yīng)力知識(shí)的實(shí)例表達(dá)方法以及實(shí)例庫(kù)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(jìn)行預(yù)應(yīng)力加工實(shí)例的檢索,闡述了現(xiàn)階段預(yù)應(yīng)力切削加工實(shí)例重用后的修改方法,以及人工干預(yù)修改方法采用上的優(yōu)點(diǎn)與不足。4.在研究了預(yù)應(yīng)力切削加工的整體結(jié)構(gòu)以及實(shí)例庫(kù)的建立細(xì)節(jié)后,經(jīng)過(guò)開(kāi)發(fā)語(yǔ)言和數(shù)據(jù)庫(kù)管理系統(tǒng)的選取,開(kāi)發(fā)了預(yù)應(yīng)力切削加工的人機(jī)交互界面,實(shí)現(xiàn)了用戶(hù)進(jìn)行預(yù)應(yīng)力工藝查詢(xún)、有限元模擬數(shù)據(jù)查詢(xún)和離散元模擬數(shù)據(jù)查詢(xún),同時(shí)設(shè)計(jì)了管理員界面,使其能夠進(jìn)行用戶(hù)管理及預(yù)應(yīng)力加工工藝實(shí)例、有限元模擬數(shù)據(jù)實(shí)例和離散元模擬數(shù)據(jù)實(shí)例的添加,使數(shù)據(jù)庫(kù)系統(tǒng)實(shí)例能通過(guò)管理員的添加實(shí)現(xiàn)主動(dòng)增長(zhǎng)。
[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(xué)位授予單位】：湘潭大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TG51;TP311.13

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本文編號(hào)：1813134