【摘要】：使用點(diǎn)陣代替實(shí)體材料進(jìn)行零件的輕質(zhì)化,是一種被廣泛接受且不斷發(fā)展的輕質(zhì)化方法。非均勻點(diǎn)陣相比均勻點(diǎn)陣,可提高輕質(zhì)化效率。在對(duì)現(xiàn)有點(diǎn)陣結(jié)構(gòu)建模技術(shù)進(jìn)行研究的基礎(chǔ)上,結(jié)合拓?fù)鋬?yōu)化結(jié)果和點(diǎn)云數(shù)據(jù)處理,提出了一種密度驅(qū)動(dòng)的非均勻點(diǎn)陣結(jié)構(gòu)建模方案。論文主要研究?jī)?nèi)容如下:1、提出了一種基于三維拓?fù)湎鄬?duì)密度數(shù)據(jù)的點(diǎn)陣構(gòu)型設(shè)計(jì)方法,建立了點(diǎn)陣參數(shù)和相對(duì)密度的對(duì)應(yīng)關(guān)系,并以幾種典型點(diǎn)陣結(jié)構(gòu)進(jìn)行例證分析。2、針對(duì)密度點(diǎn)云分布特點(diǎn)以及點(diǎn)陣建模填充區(qū)域的幾何特征,提出了一種點(diǎn)云處理方案,完成了化簡(jiǎn)、坐標(biāo)變換及輪廓和特征點(diǎn)提取,對(duì)聚類(lèi)初始點(diǎn)選擇及輪廓提取檢索模式提出了新的解決方案。3、提出了點(diǎn)陣單元結(jié)構(gòu)的模塊化建模思路,并基于此構(gòu)建了單元的自定義模型,對(duì)典型點(diǎn)陣結(jié)構(gòu)進(jìn)行了重新設(shè)計(jì)和單元參數(shù)信息封裝,實(shí)現(xiàn)了基準(zhǔn)形位參數(shù)的自動(dòng)計(jì)算。4、結(jié)合基準(zhǔn)解算和點(diǎn)陣單元重構(gòu),提出了一種自動(dòng)建模的方案。通過(guò)參數(shù)定制實(shí)現(xiàn)了非均勻點(diǎn)陣模型的快速生成。5、通過(guò)分析現(xiàn)有點(diǎn)陣處理軟件的缺陷,提出了改進(jìn)的思路。結(jié)合點(diǎn)陣單元模塊與點(diǎn)云處理數(shù)據(jù),使用Pro/Toolkit對(duì)Creo進(jìn)行二次開(kāi)發(fā),編寫(xiě)了點(diǎn)陣自動(dòng)建模插件,實(shí)現(xiàn)了參數(shù)列表導(dǎo)入與結(jié)構(gòu)自動(dòng)生成。最后,以靜載荷作用下的連桿為例,驗(yàn)證了本方案的可行性。
[Abstract]:It is a widely accepted and developing method to use lattice instead of solid material to lighten parts. Compared with uniform lattice, nonuniform lattice can improve the efficiency of lightweight. Based on the research of the existing lattice structure modeling techniques and the topological optimization results and point cloud data processing, a density driven non-uniform lattice structure modeling scheme is proposed. The main contents of this paper are as follows: 1. A design method of lattice configuration based on 3D topological relative density data is proposed. The corresponding relationship between lattice parameters and relative density is established, and several typical lattice structures are illustrated. 2. According to the distribution characteristics of density point cloud and the geometric characteristics of filling region in lattice modeling, a point cloud processing scheme is proposed, which completes the simplification, coordinate transformation and extraction of contour and feature points. This paper presents a new solution to the initial point selection and contour retrieval pattern of clustering. 3. The modular modeling idea of lattice unit structure is proposed, and the self-definition model of the unit is constructed based on this. The typical lattice structure is redesigned and the unit parameter information is encapsulated to realize the automatic calculation of the datum shape and position parameter. 4. Combining with the reference solution and the reconstruction of the lattice element, an automatic modeling scheme is proposed. The rapid generation of nonuniform lattice model is realized by parameter customization. 5. By analyzing the defects of existing lattice processing software, an improved idea is put forward. Combined with dot matrix unit module and point cloud processing data, the second development of Creo is carried out by using Pro/Toolkit, and the automatic modeling plug-in of dot matrix is written. The parameter list import and structure automatic generation are realized. Finally, the feasibility of the scheme is verified by taking the connecting rod under static load as an example.
【學(xué)位授予單位】：國(guó)防科學(xué)技術(shù)大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類(lèi)號(hào)】：TB303

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