【摘要】：結(jié)構(gòu)對(duì)稱破缺是產(chǎn)品結(jié)構(gòu)演化過(guò)程中一個(gè)普遍而有趣的現(xiàn)象。在原創(chuàng)設(shè)計(jì)中,結(jié)構(gòu)對(duì)稱、對(duì)稱破缺的應(yīng)用規(guī)律和應(yīng)用方法可為設(shè)計(jì)人員科學(xué)的、有區(qū)別的、有目的的應(yīng)用結(jié)構(gòu)對(duì)稱破缺實(shí)現(xiàn)產(chǎn)品功能、提高產(chǎn)品性能、滿足設(shè)計(jì)約束提供系統(tǒng)性的指導(dǎo)。在改進(jìn)設(shè)計(jì)及優(yōu)化設(shè)計(jì)中,對(duì)稱和對(duì)稱破缺結(jié)構(gòu)的不同功效及機(jī)械產(chǎn)品結(jié)構(gòu)對(duì)稱性程度的改變所帶來(lái)的功效上的變化規(guī)律,可指導(dǎo)設(shè)計(jì)人員通過(guò)改變結(jié)構(gòu)的對(duì)稱性程度來(lái)實(shí)現(xiàn)產(chǎn)品設(shè)計(jì)需求。作為機(jī)械對(duì)稱性理論的重要組成部分,本文的研究將為建立完善的機(jī)械對(duì)稱性理論做出重要貢獻(xiàn)。在深入分析當(dāng)前各領(lǐng)域?qū)ΨQ破缺的存在和研究現(xiàn)狀基礎(chǔ)上,從以下方面展開(kāi)對(duì)機(jī)械對(duì)稱破缺理論的闡述:1、建立完善的機(jī)械結(jié)構(gòu)對(duì)稱破缺的概念分類體系。全面系統(tǒng)地搜集有關(guān)對(duì)稱破缺的機(jī)械結(jié)構(gòu)實(shí)例,整理分類并建立實(shí)例庫(kù),研究實(shí)例的對(duì)稱主體、對(duì)稱組元、對(duì)稱基準(zhǔn)和對(duì)稱操作四大對(duì)稱性要素的破缺形式和破缺程度,在此基礎(chǔ)上建立一套比較完善的機(jī)械結(jié)構(gòu)對(duì)稱破缺概念體系。2、建立機(jī)械結(jié)構(gòu)對(duì)稱破缺的破缺度評(píng)判模型。設(shè)計(jì)一套評(píng)定算法,計(jì)算機(jī)械結(jié)構(gòu)對(duì)稱破缺的破缺程度,用以區(qū)分機(jī)械機(jī)構(gòu)對(duì)稱和對(duì)稱破缺。建立的評(píng)定算法以單因素方差分析為基礎(chǔ),對(duì)對(duì)稱性要素的破缺量進(jìn)行數(shù)學(xué)計(jì)算,從而得出結(jié)構(gòu)的破缺程度,計(jì)算結(jié)果越大,表明結(jié)構(gòu)的破缺程度越大,其對(duì)稱度越低。3、總結(jié)對(duì)稱破缺應(yīng)用于機(jī)械產(chǎn)品設(shè)計(jì)中的設(shè)計(jì)知識(shí)。基于大量實(shí)例的分析,系統(tǒng)的研究機(jī)械對(duì)稱性結(jié)構(gòu)在對(duì)稱度變化時(shí)其功能、性能的演變方式,挖掘出具有一定普適性和實(shí)用性的設(shè)計(jì)知識(shí),進(jìn)一步拓展對(duì)稱破缺知識(shí)的應(yīng)用范圍。4、研究機(jī)械結(jié)構(gòu)對(duì)稱破缺的應(yīng)用方法。通過(guò)列舉實(shí)例,把在機(jī)械設(shè)計(jì)中對(duì)稱破缺的設(shè)計(jì)知識(shí)的應(yīng)用原理、應(yīng)用方法進(jìn)行比較研究,明確各自的應(yīng)用規(guī)律及應(yīng)用范圍的異同,給出若干機(jī)械結(jié)構(gòu)對(duì)稱性在實(shí)現(xiàn)常見(jiàn)設(shè)計(jì)需求中的應(yīng)用方法,對(duì)結(jié)構(gòu)對(duì)稱破缺的實(shí)際應(yīng)用提供指導(dǎo)。本文的研究集中于機(jī)械結(jié)構(gòu)對(duì)稱破缺,系統(tǒng)的研究了結(jié)構(gòu)對(duì)稱破缺在機(jī)械系統(tǒng)中的存在形式,破缺程度的判別方法,總結(jié)了對(duì)稱性結(jié)構(gòu)對(duì)稱度變化與功能、性能演變關(guān)系的設(shè)計(jì)知識(shí),建立了機(jī)械結(jié)構(gòu)對(duì)稱破缺的若干應(yīng)用方法。本文的研究成果有助于全面正確的認(rèn)識(shí)機(jī)械結(jié)構(gòu)對(duì)稱破缺,有助于系統(tǒng)科學(xué)的應(yīng)用結(jié)構(gòu)對(duì)稱破缺,在一定程度上豐富和推進(jìn)了機(jī)械對(duì)稱性理論的研究。
[Abstract]:Structural symmetry breaking is a common and interesting phenomenon in the evolution of product structure. In original design, the application law and method of structure symmetry and symmetry breaking can be used scientifically, differently and purposefully for designers to realize product function and improve product performance. Meet design constraints to provide systematic guidance. In the improvement design and the optimization design, the different efficacy of symmetry and symmetry broken structure and the change of the degree of symmetry of mechanical product structure bring about the law of efficacy change, Designers can be guided to achieve product design requirements by changing the symmetry of the structure. As an important part of the theory of mechanical symmetry, the research in this paper will make an important contribution to the establishment of perfect theory of mechanical symmetry. On the basis of deeply analyzing the existence and current research situation of symmetry breaking in various fields, the paper expounds the theory of mechanical symmetry breaking from the following aspects: 1. Establish a perfect conceptual classification system of symmetrical breaking of mechanical structures. In this paper, the mechanical structure examples of symmetry breaking are collected, classified and established, and the breaking forms and breaking degree of the symmetry elements, such as symmetry main body, symmetric component, symmetric datum and symmetric operation, are studied. On the basis of this, a set of relatively perfect concept system of symmetrical breaking of mechanical structure is established. 2, the breaking degree evaluation model of symmetrical breaking of mechanical structure is established. A set of evaluation algorithm is designed to calculate the breaking degree of mechanical structure symmetry breaking, which is used to distinguish the symmetry of mechanical mechanism from symmetric breaking. The established evaluation algorithm is based on the analysis of variance of single factor and calculates the breaking quantity of symmetry elements. The greater the result of the calculation, the lower the degree of symmetry, the greater the result of calculation, the lower the degree of symmetry. The design knowledge of symmetry breaking applied in mechanical product design is summarized. Based on the analysis of a large number of examples, this paper systematically studies the function and performance evolution of mechanical symmetry structure when its symmetry degree changes, and excavates the design knowledge with certain universality and practicability. Further expand the scope of application of symmetrical breaking knowledge. 4, study the application method of mechanical structure symmetry breaking. Through enumerating examples, the application principle and application method of symmetrical broken design knowledge in mechanical design are compared and studied, and the similarities and differences of their respective application rules and application scope are clarified. The application methods of some mechanical structure symmetries in the realization of common design requirements are given, which provide guidance for the practical application of structural symmetry breaking. This paper focuses on the symmetrical breaking of mechanical structure, systematically studies the existing form of structural symmetry breaking in mechanical system, and summarizes the variation and function of symmetry degree of symmetry structure. Based on the design knowledge of performance evolution relation, some application methods of mechanical structure symmetry breaking are established. The research results of this paper are helpful to fully and correctly understand the symmetry breaking of mechanical structure, and to the application of system science, it enriches and advances the research of the theory of mechanical symmetry to a certain extent.
【學(xué)位授予單位】：寧波大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2017
【分類號(hào)】：TH122

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本文編號(hào)：2359781