發(fā)布時間：2018-01-12 01:15

  本文關(guān)鍵詞：逆向工程中基于特征提取的建模技術(shù)研究　出處：《廣東工業(yè)大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

  更多相關(guān)文章： 逆向建模 曲面特征 實(shí)體特征 模型重構(gòu) Geomagic Design Direct

【摘要】：隨著科技和經(jīng)濟(jì)日益朝全球化方向發(fā)展,逆向工程技術(shù)作為一種消化吸收先進(jìn)設(shè)計理念的設(shè)計方法,逐漸受到各國學(xué)術(shù)界和工業(yè)界的重視。實(shí)物逆向工程技術(shù)以重構(gòu)產(chǎn)品實(shí)物的CAD模型為主要研究內(nèi)容,而CAD模型是現(xiàn)代產(chǎn)品開發(fā)、制造生產(chǎn)、再設(shè)計和修復(fù)破損零部件等的基礎(chǔ)。因此,基于產(chǎn)品實(shí)物的逆向工程技術(shù)不僅是航空航天和汽車等行業(yè)的一種重要的設(shè)計方法,而且在文物保護(hù)、破損零件修復(fù)及再制造等方面也有重要作用�；�于產(chǎn)品實(shí)物的逆向工程技術(shù)的主要目的是重構(gòu)得到準(zhǔn)確、有效的CAD模型,即其核心是逆向建模技術(shù)。目前,根據(jù)重構(gòu)CAD模型過程中提取特征和最終建模結(jié)果的不同,可將逆向建模技術(shù)分為兩種：基于曲面重構(gòu)的逆向建模方法、基于實(shí)體重構(gòu)的逆向建模方法�；�于曲面重構(gòu)的逆向建模方法是相對發(fā)展得較早的一種逆向建模方法,該方法重構(gòu)的CAD模型是曲面模型,在基于重構(gòu)CAD模型的基礎(chǔ)上進(jìn)行再設(shè)計、CAE結(jié)構(gòu)仿真分析等方面受到限制。而且該方法通過提取曲面特征來重構(gòu)CAD模型,在重構(gòu)機(jī)械零部件的幾何形狀時無法準(zhǔn)確反映某些幾何規(guī)則特征及其相互之間的約束關(guān)系。因此,本文針對基于曲面重構(gòu)的逆向建模方法中的建模缺陷,對逆向建模方法中的研究熱點(diǎn)——基于實(shí)體重構(gòu)的逆向建模方法——進(jìn)行了重點(diǎn)研究和介紹。該方法可從由原始測量數(shù)據(jù)預(yù)處理后得到的三角網(wǎng)格面模型中識別并提取實(shí)體特征,或識別并提取實(shí)體特征的相關(guān)元素后應(yīng)用正向建模方法還原實(shí)體特征。另外,通過對提取的實(shí)體特征進(jìn)行參數(shù)化編輯修改,可精確定義特征的幾何參數(shù)及特征之間的約束關(guān)系。本文利用實(shí)體逆向建模方法中的特征識別與提取功能,提出了針對殘缺數(shù)據(jù)的逆向建模方法,并以某一機(jī)械零部件的殘缺三角網(wǎng)格面模型為例重構(gòu)其實(shí)體模型,以對該方法的建模流程和特點(diǎn)進(jìn)行了具體介紹和驗(yàn)證分析。本文另一部分工作是針對航空航天行業(yè)中復(fù)雜的機(jī)械零部件,無法應(yīng)用單一的逆向建模方法重構(gòu)得到準(zhǔn)確、有效CAD模型的問題,提出了基于曲面和實(shí)體特征提取的混合逆向建模方法,在結(jié)合不同逆向建模軟件平臺以重構(gòu)復(fù)雜工業(yè)產(chǎn)品CAD模型的應(yīng)用上進(jìn)行了有益嘗試。
[Abstract]:With the development of science and technology and economy towards globalization, reverse engineering is a design method that absorbs advanced design ideas. Physical reverse engineering technology focuses on reconstructing the CAD model of products, while CAD model is modern product development, manufacturing and production. Therefore, reverse engineering based on products is not only an important design method in aerospace and automobile industries, but also in the protection of cultural relics. The main purpose of reverse engineering technology based on products is to reconstruct accurate and effective CAD model, that is, reverse modeling technology is the core of it. At present, the main purpose of reverse engineering technology is to obtain accurate and effective CAD model. According to the difference of feature extraction and final modeling result in the process of reconstructing CAD model, reverse modeling technology can be divided into two kinds: reverse modeling method based on surface reconstruction. The reverse modeling method based on surface reconstruction is a relatively early reverse modeling method, and the CAD model reconstructed by this method is a surface model. Based on the reconstructed CAD model, the simulation analysis of the redesigned CAD structure is limited, and the method reconstructs the CAD model by extracting the surface features. The geometric shape of mechanical parts can not accurately reflect some geometric characteristics and their mutual constraints. Therefore, this paper aims at modeling defects in the reverse modeling method based on surface reconstruction. In this paper, the research focus of the reverse modeling method, the reverse modeling method based on entity reconstruction, is mainly studied and introduced. The method can be identified from the triangular mesh model obtained from the preprocessing of the original measurement data. And extract the entity features. Or identify and extract the relevant elements of entity features and then use forward modeling method to restore entity features. In addition, the extracted entity features are modified by parameterized editing. The geometric parameters of features and the constraint relations between features can be precisely defined. In this paper, a reverse modeling method for incomplete data is proposed by using the feature recognition and extraction function in the method of entity reverse modeling. Taking the incomplete triangular mesh model of a mechanical part as an example, the entity model is reconstructed. The modeling process and characteristics of this method are introduced and verified. Another part of this paper is aimed at the complex mechanical parts in aerospace industry. A hybrid reverse modeling method based on surface and entity feature extraction is proposed, which can not be used to reconstruct the accurate and effective CAD model with a single reverse modeling method. A useful attempt has been made in reconstructing the CAD model of complex industrial products with different reverse modeling software platforms.
【學(xué)位授予單位】：廣東工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2015
【分類號】：TB47

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