數學光順 的英文怎麼說
中文拼音 [shǔxuéguāngshùn]
數學光順
英文
mathematical fairing-
The figure of the part ' s original shape depend on digital equinpent mostly. digital equiment is divided into two big types, contac ttype and uncontact tyope. the contact type decelop with the optical and electonic element applied widely. uncontact measurement is rapid. the measured part is not scared, but it requirethat the measured part ' s surface can glisten. cmm is typical delegate of contact measurementcomparing to uncontact measurement, cmm is slow, but it has upper measurement precision. in range of required figure precision, it will affact the selective way of moddfile cuver
由於其測量過程是利用光學方法進行的,從而對被測物體的表面提出了一定的要求,表面反光或全黑的物體都不適合於光學方法進行測量,或者說當遇到這樣的被測物體時需要更復雜的光學技術來保證測量的順利進行。坐標測量機( coordinatemeasuringmachine , cmm )是接觸式數字化設備的典型代表。和非接觸測量方法相比, cmm雖然在數字化速度上比較低,但是它具有較高的測量精度。56 liu x, bao h, shum h - h, peng q. a novel volume constrained smoothing method for meshes. graphical models, 2002, 64 : 169 - 182. 57 liu x, bao h, peng q et al
本文將首先介紹最基本的網格光順方法laplacian光順法及其數學原理,然後簡單介紹幾個以laplacian光順法為基礎的各種無收縮光順法和各項異性光順法。In this paper, authors have predominantly discussed mathematical model of cad for designing bodyplan of fishing vessels, generating and gradually and perfectly completing data base system of prototypes for pattern of vessels with technique of data base, and completing fairing of lines by insertion of cubic sample function and its software system
摘要本文重點討論了在計算機輔助漁船型線設計中採用的數學模型,應用數據庫技術生成和逐漸完善母型船的型船庫系統,以及採用三次樣條函數插值解決光順問題和軟體系統。To fulfill the need of the application of rp technique in medical domain, reverse cad modeling from medical cross sections is systematically studied in this dissertation. firstly, some algorithms related to the research of this dissertation are studied. new algorithms for orientation and inclusion test for simple polygon, an error constrained automatic faring algorithm for b - spline curve and a theorem regarding the termination criterion for subdivision of triangular bezier patch are proposed
本文針對rp技術在醫學領域應用的需要,系統研究了基於醫學斷層輪廓數據的反求cad建模理論和方法: ( 1 )在基礎演算法研究部分,提出了簡單多邊形方向及點在多邊形內外判斷的新方法、三角b zier曲面片離散的誤差控制定理和一種帶誤差約束的b樣條曲線的自動光順方法; ( 2 )提出了一種基於相鄰層輪廓相似性的醫學斷層輪廓數據曲面重構方法; ( 3 )提出了一種稱為「虛擬測量」的曲面模型處理方法。In order to get a satisfied digital automotive model, some other optimizd methods are brought into effect because sometimes the optimized data processed by mathematics method is not good enough to get satisfied surface and at the same time there are some breaking surface in the model which is disadvantage to make a smooth surface
當通過利用數學模型對測量數據進行優化仍難以獲取良好的反求曲面,或者汽車模型上的一些曲面突變特徵不利於光順曲面的建立時,需要採取其他的優化措施對測量數據進行二次優化。Secondly, based on the theories of computer graphics and computer aided geometric design, and according to the traits of automobile panels, the related theory and experience about 3d geometric expressing of automobile panels are described. it is studied to the constitution methods of typical surfaces forming the surfaces of automobile panel, fairing quality and error analysis and optimization of reconstruction surfaces, and the storage structure of " half " edge for 3d model, data changes in different stamping steps and data exchange among the different software
然後,在計算機圖形學和計算機輔助幾何設計等理論的基礎上,根據汽車覆蓋件的特點,歸納總結了適用於汽車覆蓋件三維形體幾何表達的相關理論和經驗;研究了構成汽車覆蓋件曲面的典型曲面構造方法,重構曲面的光順品質分析、誤差分析與曲面品質優化的方法,三維重構模型的「半」邊數據結構、不同沖壓工序中的數據演化以及不同軟體平臺之間的數據交換;提出了根據周邊曲面的形狀特點構造交匯曲面的方法。Firstly the thesis expatiates the basic concept of reverse engineering, analyzes the basic principle of reverse engineering, the technology & theory of three dimensional measuring and basic theory of building 3 - dimensional free - form surfaces model. secondly it introduces the smooth methods of the free - form surfaces of auto body and solves point - data and surface reconstruction. finally the thesis expatiates applications and technology of auto body of futian heavy truck through reverse engineering
本文首先將闡述逆向工程的基本概念,分析車身逆向工程的基本原理以及車身逆向工程中三坐標測量技術與原理,車身表面三維數學曲面模型建立的理論基礎,其次介紹車身外形曲面光順方法,以及車身逆向工程中點數據處理技術及曲線曲面重建技術,最後結合福田重卡車身逆向開發,重點闡述車身逆向工程技術的應用與流程。In this thesis, non - uniform rational b - spline, i. e., named nurbs, is used to model ship - hull surface. interpolating, fairing and representing ship - hull surfaces are the most important parts of researching task
所以,用nurbs技術作為數學工具,對船體曲面進行表達、插值和光順處理是本文的主要研究內容之一。We must figure out some practicable equations to calculate the hull lines that should be smoothness and fit the real ship lines. these data, which are already exanimated, can be the original data of fluid dynamic calculation and the original data of ship - manufacture
它要求我們尋求並採用適當的數學表達式,找到某種有效的方法,在滿足設計要求的前提下求出具有實用價值並且光順的船體型線,為水動力計算以及建造施工提供所需要的數據。We must figure. out some practicable equations to calculate the hull lines that should be smoothness and fit the real ship lines. these data, which are already exanimated, can be the original data of fluid dynamic calculation and the original data of ship - manufacture
它要求我們尋求並採用適當的數學表達式,找到某種有效的方法,在滿足設計要求的前提下求出具有實用價值並且光順的船體型線,為水動力計算以及建造施工提供所需要的前期數據。分享友人