parametric surface 中文意思是什麼

parametric surface 解釋
參數曲面
  • parametric : adj. 參（變）數的；參量的。
  • surface : n 1 表面；地面；水面；廣場，空地。2 外觀，外表，皮毛。3 【幾】面；切口；【航空】翼面。adj 表面的...
  1. By this solution, a balde body model can be created by the optimization of the parametric grid of the blade body surface. some key techniques used in the solution, such as the computation of the data points on the meanline, the technology of cotinuty between the leading line and the outline of the blade body and the technology of the cross - section curve discretization, are disserated, and corresponding algorithm are presented in this paper

    在進行參數網格優化的過程中，需要進行中弧線數據點求解、緣頭拼接和截面線離散，本文對以上三個問題進行了深入研究，並在此基礎上提出了中弧線數據點求解演算法，緣頭拼接演算法和截面線離散演算法等研究成果。
  2. Based on a systematic discussion on the contents, characteristics and the up - to - now accomplishments of these three operations in cagd, we present our researches in three ways as follows : ( 1 ) efficient evaluation for parametric curves and surfaces based on generalized ball bases based on the generalization of mathematical model of surface lofting program in the consurf system, two generalized ball surfaces and the recursive algorithms for evaluating them are given. furthermore, the conversion algorithms from bezier form of a surface to these two generalized ball forms are presented

    在系統地論述cagd中此三類運算的內容、特點、已有研究成果的基礎上，就以下三方面給出了研究成果： （ 1 ）基於廣義ball基的參數曲線曲面快速求值以前英國航空公司consurf系統機身模線程序數學模型的推廣為基礎，定義了兩類廣義ball基曲面，給出了求值的遞推演算法，推導了b zier曲面到這兩類曲面的轉換演算法
  3. Secondly, based on nurbs curves approximation algorithm, a nurbs surface approximation algorithm on discrete data sets is given. thirdly, a shape - preserving parametric surface interpolation to data set is given

    2基於所給的nurbs曲線的逼近演算法，建立了帶插值條件的離散點集的nurbs曲面的逼近演算法。
  4. ( 2 ) intersectioning algorithm of nurbs surface and general implicit surface is researched in which the parametric formula are substituted into the implicit surface equation and then get the nonlinear two - dimensional equation on parametric domain

    （ 2 ）實現了nurbs參數曲面與廣義的隱式曲面的求交演算法並將其應用於船體曲面與水線面的求交中。
  5. By pre - dividing parametric region of the surface and introducing the concept “ maximum absolute normal curvature ” at a point on the surface, the method adopts “ divide and conquer ” approach triangulating the parametric region of the surface piecewise

    該演算法通過對曲面的參數域進行預剖分，以及引入曲面上一點處的「最大絕對法曲率」的概念，採用「分而治之」的方法分片對參數曲面的參數域進行三角形網格剖分。
  6. Several key techniques of carving and milling machine cnc system are deeply studied they include : the transformation, data rebuild and interface design of huge volume nc program produced by cam ; the algorithm of cubic parametric spline pre _ interpolation and high speed real time interpolation in the cnc system, which. will gain a much higher surface precision and cutting speed ; methodology and algorithm of movement velocity acceleration control on a real time forecast _ and _ prejudge basis is designed. therefore, a smooth movement is insured. the shake and noise problem caused by non _ uniform pules for driving stepping or servo motor is solved by an improving algorithm to generate uniform pules

    同時，本文對基於統一的pc平臺的雕銑機數控系統中的幾項關鍵技術進行了深入的研究，包括： cam生成加工程序的傳送、接收、讀取及其加工鏈表的生成和實時重構；對cam生成的離散數據進行三次參數樣條插值和基於累加弦長的三次參數樣條插補控制，保證加工工件表面的精度和光順性；設計具有「前瞻」功能的自動升降速控制方法，保證加工過程的平穩性；通過脈沖均勻化，有效地解決加工過程中因為脈沖不均勻而引起的震動問題。
  7. Using local base surface parameterization, a parametric quadric surface approximation method is used to estimate the local surface curvature properties of scattered points based on propagating normal vector direction

    首先，計算各點的鄰近點集，選取合適的局部基礎曲面，把鄰近點集投影到相應的局部基礎曲面。
  8. The former method is parametric surface integral and the latter is to triangulate closed surface based on nurbs. ( 4 ) the key technique in probabilistic damaged stability calculation is discussed

    （ 4 ）對概率破艙穩性計算中多艙組合破損時船體的浮態與穩性計算發生異常的原因進行了研究。
  9. Based on the daily surface air temperature data from 200 stations and daily precipitation data th from 739 stations during the second half of the 20 century, schemes for analyzing climate extremes were designed mainly according to percentiles of a non - parametric distribution and the gross errors in the daily data were removed based on a newly designed quality control procedure. the spatial and temporal characteristics of change of climate extremes over china were studied, the major conclusions are summarized as : th 1. slight decrease trends were found for the 95 percentiles of daily maximum temperatures during summer, but larger increase trends were revealed for the 5th percentiles of daily minimum temperatures during winter, especially in northern china

    本文利用中國20世紀後半葉較為完整的逐日溫度和降水觀測資料，設計了嚴格的資料質量控制方法，以統計上的邊緣分佈的客觀定義為主要依據，確定了極端溫度和降水事件，研究揭示了近50年中國極端氣候事件變化的規律，得到以下主要結果： 1 .全國最高溫度的極端高值略趨下降；最低溫度的極端低值升溫趨勢顯著，這種增溫在冬季、在北方最顯著。
  10. Next, in the interior of the patches, surface fitting points and cross boundary derivatives are estimated from the reference curves by constructing virtual iso - parametric curves

    其次，在曲面片內部，曲面擬合點和邊界方向導數可以從參考曲線中通過構建虛擬等參線的方法得到。
  11. Its properties and design method is discussed in chapter 4. for control meshes with arbitrary topology, we present a universal method in chapter 5 to construct parametric curves and surfaces. generalized rational parametric surface can be controlled precisely and flexible, and it is easy to model local features and 3d primitives

    然後，在第五章中，我們將控制網格進一步推廣到任意可定向二維拓撲流形，提出了一個通用的方法將控制網格映射到與之拓撲同胚的微分流形上，統一了廣義有理參數曲線曲面的構造過程。
  12. The maximal tension stresses in surface and base between induced crack have been obtained by parametric analysis

    通過結構參數分析掌握了預切縫間面層、基層中最大拉應力的分佈規律。
  13. The constructed surface is c2 continuous on the whole domain, and is a piecewise cubic parametric polynomial on every subdomains. the interpolating surface can preserve the convexity, concavity, inflection property and monotonicity of the data set. in the end, each algorithm brought forward in the paper is exemplified, at the same time, error is discussed

    3針對保形曲面插值問題，提出了一種插值于給定數據點集的參數型保形曲面插值演算法，所構造的曲面在整個區域上是c ~ 2連續的，在每個子區域上是分片三次參數多項式，並且保持被插函數集的所有子區域的邊界及其內部的軸向單調性、凸凹性以及拐點性質。
  14. Parametric determination for surface wave probe of aviation plate component

    航空薄板構件表面波探頭主要參數的確定
  15. Grpcs provides a unified framework for parametric curve and surface. it does not only inherit a lot of good properties from nurbs such as locality, convex hull, affine and perspective invariance etc., but also has the ability to directly represent trimmed surfaces and closed surfaces

    廣義有理參數曲線曲面在表示形式和計算方法上具有高度的統一性，它不僅繼承了nurbs的很多優良性質，比如局部控制性、凸包性、仿射和投影不變性等，而且可以直接表示裁剪曲面和閉合的曲線曲面。
  16. An implicit equation with guaranteed differential properties is obtained by simple combinations of the primitives implicit representations using r - function theory. the surface corresponding to the zero - set of the implicit equation is efficiently and directly polygonized using the primitives parametric forms

    但是，要得到所構建物體的外表面，也就是相關隱函數的零集合，需要對隱函數進行顯示求解或使用一些面片生成演算法如marching cubes演算法。
  17. In this thesis, motion estimation and compensation, the key technology of video coding, are investigated. its specific work includes : making analysis on the video motion models, deducing the parametric model which describes the orthographic projection of 3 - d rigid motion of a surface to the 2 - d image plane

    本文對視頻壓縮編碼中的關鍵技術? ?運動估計和補償方法進行了研究，內容包括:對視頻運動模型進行分析，推導了三維剛體經攝像機正交投影到二維空間后的運動場參數模型。
  18. Algorithms of curvature estimation and data simplification of scattered point cloud data are studied. local surface curvature properties on scattered - point data are estimated using a parametric quadric surface approximation, and the key step is local base surface parameteration method which resolves parameteration of scattered - point data. an algorithm is presented for simplifying the scattered point cloud data based on curvature restriction

    實例表明，本文演算法的簡化結果既較好地保留了形狀特徵，同時使點的分佈以點雲密集的強制保留區為中心，在向附近擴散的過程中逐漸變稀，避免簡化后點雲的局部過密或局部過稀的情況。
  19. A survey of parametric scattered data fitting using triangular interpolants. curve and surface design, h. hagen ed., springer - verlag, 1992

    2在每條邊界曲線上指定相應的二次法向量，其與邊界曲線的切向量相垂直。
  20. ( 1 ) presents a grid - based intersection algorithm of parametric surface and plane, which is characterized by effectiveness and conciseness, and has been successfully implemented in the rp data processing software

    所作的主要工作如下： （ 1 ）提出一種基於網格劃分的參數曲面與平面求交演算法。這種演算法簡單、實用，已成功地應用於基於cad模型直接分層的rp數據處理軟體中。
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