parametric curve 中文意思是什麼

parametric curve 解釋
參數曲線
  • parametric : adj. 參（變）數的；參量的。
  • curve : n 1 曲線；彎曲；彎曲物。2 曲線規 （＝French curve）；【機械工程】曲線板；【棒球】曲線球；【統計學...
  1. Study on interpolation approach for 3d parametric curve

    三維參數化曲線插值方法研究
  2. 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。
  3. Abstract : this paper has deduced a new method for risering ， ? parametric method. it has proved with the test curve of the british castin g p ractice commission. practical results have well perfected furt her the perimetrischen quotlent method for risering. a conclusion is drawn that rise r supplement shrink efficiency is directly proportion to the ratio of casting to riser perimetrischen quotient

    文摘:提出的冒口設計新方法?參數法，與英國鑄造實踐委員會給出的實驗曲線相互印證其實用性，進一步完善了冒口設計的周界商法；得出了冒口補縮效率與鑄件和冒口的周界商比值成正比的結論。
  4. ( 2 ) offset approximation for bezier curves the problem of parametric speed approximation of a curve is raised. the author points out that the crux of offset curve approximation lies in the approximation of parametric speed

    （ 2 ）等距曲線逼近（ offset ）提出了曲線參數速度逼近問題，指出等距曲線逼近問題的關鍵在於參數速度的逼近
  5. The parametric speed of the curve is firstly approximated by the bezier polynomial which takes the lengths of control polygon ' s edges of the direction curve of normal as bezier coordinates. then the corresponding geometric offset approximation algorithm is given. moreover, an offset approximation with high precision is obtained by degree elevation of the direction curve of normal

    首先利用以法矢方向曲線的控制多邊形邊長為b zier縱標的b zier多項式來逼近曲線的參數速度，給出了相應的幾何等距逼近演算法，進一步結合法矢方向曲線的升階獲得了高精度逼近
  6. After giving the legendre polynomials approximation to parametric speed of the curve, the author gives the jacobi polynomials approximation to parametric speed with endpoints interpolation. from this, two algebraic offset approximation algorithms, which preserve the direction of normal, are derived

    給出了曲線參數速度的legendre多項式逼近，進一步給出了參數速度的插值區間端點的jacobi多項式逼近，由此導出了保持法矢平移方向的兩個等距代數有理逼近演算法
  7. Another algorithm is based on pixels : sample many points along the curve, round them to the nearest integer and set each pixel the computed point falls in. although this algorithm uses integer arithmetic, it provides the smooth curve possible at the expense of computation time as many points have to be computed to ensure that no gaps are created along the curve. furthermore these two algorithms we mentioned above is appropriate for low degree parametric curves, for high degree parametric curves, we usually approach them by using low degree rational parametric curves, the generating curve ' s fairness property is not very good

    我們知道當節點矢量的兩端節點均為k重節點且無內節點時， b樣條基函數退化為bemstein多項式，因此該生成演算法還可推廣到b能ier曲線中，具有廣泛的應用價值、同樣地，在cad和cagd中，有理b樣條曲線，特別是非均勻有理b樣條曲線（ nurbs ）已經成為曲線曲面設計中最廣為流行的技術，然而對這些曲線目前也尚無很好的曲線生成演算法，因此有理b樣條曲線的生成演算法無疑有著更重要的意義
  8. Based on these foundations, we give a perfect scheme of the bbo opos : single pass amplification coefficient of the opg under different pump intensity is calculated ; collinear type - i and type - ii phase matching tuning curve pumped by the q switch nd : yag various harmonics as well as noncollinear type - i tuning curve are calculated in details ; the effect of the walkoff for the nonlinear effect coefficient and the group velocity matching are analyzed ; the acceptance angle in parametric process is calculated ; the numerical threshold of the bbo opo is calculated ; the process of the saturation and depletion of the pump beam are analyzed ; the relationship of the conversion efficiency and reflectance of output mirror are discussed ; various linewidth controlling methods are discussed ; the improvement of the beam quality applying the unstable cavity is discussed ; and the crystal bbo design is considered

    在此基礎上，給出了一整套bbo - opo激光參數設計方案：計算了不同泵浦強度下的參量放大倍數；詳細計算了在nd : yag調q激光器各次諧波泵浦條件下的共線類和類相位匹配的調諧曲線，以及非共線類相位匹配調諧曲線；分析了走離角對非線性系數和群速匹配的影響；計算了參量過程的允許角；計算了bbo - opo的理論閾值條件；分析了飽和與泵浦光束的消耗過程；給出了轉換效率與超過泵浦閾值的倍數的關系；討論了轉換效率與輸出鏡反射率的關系；討論了線寬控制的各種方法；研究了利用非穩腔改善光束質量的方法；考慮了bbo晶體的設計。
  9. Take the core part in the design of double cycloidal steel ball reducer - the parametric equation of tooth profile curve of cycloidal groove - as the mainline ; an analysis has been carried out on the main designing parameters of tooth profile curve of this novel reducer and the selection principle of each parameter in the design of this kind of reducer was obtained

    摘要以雙擺線鋼球減速器設計中的核心部分擺線槽齒廓曲線的參數方程為主線，對這一新型減速器齒廊曲線的主要設計參數進行了分析，得出了各參數在這種減速器設計中的選擇原則。
  10. Firstly, based on research of the asymmetric involute gear cutter and the gearing theories, the universal tooth flank curve equations of asymmetric gear with two pressure angles and the tooth transmission curve are derived by the gear shape nomal method, then the fea model of asymmetric involute gear with main parameters is automatically generated with ansys parametric design language ( apdl )

    本文首先建立非對稱漸開線刀具的方程，根據齒形法線法建立非對稱漸開線齒輪的齒廓曲線方程，並利用apdl參數化建模語言建立全參數的非對稱漸開線齒輪有限元模型。討論了非對稱漸開線齒輪的嚙合特性，對非對稱漸開線齒輪傳動特點作了詳細的分析。
  11. By applying the optimal control theory and using the method of multi - designing points to design the cam contour curve with both good dynamic property and strong parametric anti - disturbance force, and the feasibility of this method was verified by a living example

    摘要應用最優控制理論，提出以多設計點法來設計既有良好動態特性且抗參數擾動力強的凸輪輪廓曲線，並以實例驗證了該方法的可行性。
  12. 3 zhang c, cheng f, miura k. a method for determing knots in parametric curve interpolation. cagd, 1998, 15 : 399 - 416. 4 fritsch f n, carlson r e. monotone piecewise cubic interpolation

    文章以四組有代表性的數據為實例，通過定義節點用樣條函數方法構造三次參數樣條曲線，將新方法與向心參數化法修整弦長參數化法和二次精度方法進行了比較。
  13. An explicit formula of ultimate strength is achieved according as combination of elastic large deflection method and rigid plastic method for perfect plates. 2. the explicit formulae with damage parameters as variable of reduction factors for ultimate strength of damaged plates are achieved by curve fitting based on a mass of numerical computation for parametric imperfection and damage of plates

    將板格的各種缺陷和損傷形式參數化，通過大量數值計算擬合出受損板格極限強度折減系數的以損傷參數為變量的顯式表達示，用折減系數對完好板格極限強度進行折減得到受損板格極限強度公式。
  14. The thesis discusses two respects of contents : one is deformation of combination of parametric curve. the other is smoothing of combination of parametric curve. bezier curve has good character, because it uses a sequnce of special basic function

    本文論述了二個方面的內容：一是組合參數曲線的變形。二是組合參數曲線的磨光。對于貝齊爾曲線，由於它採用一組獨特的基函數，所以它具有良好的優良性質。
  15. The tuning curve of type - i phase matching of bbo opo are measured with accuracy ; the maximum conversation in total of the system is about 31 % at 615. 6 nm, and it is fitted well with the gtp formula ; in the end we compared the output linewidth and unstable cavity far field beam qua lity of the bbo opo under the condition of type - i phase matching and type - ii phase matching, it is proved that we can obtain the parametric output of linewidth less than 0. 3 nm and the beam divergence angle approaching diffraction limits by take the advantages of type - ii phase matching and unstable cavity designs

    測量了該系統的轉換效率最大為31 ，並能與理論公式極好地吻合，最後比較了在類相位匹配條件下和類相位匹配條件下的bbo - opo的輸出線寬，以及非穩腔的遠場光束質量，實驗結果表明，利用類相位匹配以及非摘要穩腔設計可以獲得線寬小於0 3nlm 、光束發散角接近衍射極限的參量光輸出。
  16. In addition, we often encounter a general problem - it is very difficult to describe a complex shape with a single bezier curve precise. method of bezier definites shape of curve, which is global project. if you locally modify curve, it is necessary to affact the global. it is that method of bezier has character of global control, but it has not charater of local control. by way of arbitrary partition. arbitrary degree elevation, that may increases control point. increases potential active character of controling curve. therefore, the thesis discusses mainly the problem of local free - form deformation, which may make bezier curve deform continuely and gain wanted figures. however, no matter what free - form deformation based on extension factor for parametric curve or arbitrary partition will reduce smoothness of parametric curve

    另外，我們經常會遇到一個普遍問題，就是難以用單一的貝齊爾曲線段描述復雜的形狀。貝齊爾方法對形狀的定義是整體方案，欲對其作局部修改，必然會影響到整體，即貝齊爾方法是有整體控制性質，但卻缺乏局部控制性質。通過任意分割和任意升階得出所要變形的一段，以及增加控制點，增加對曲線進行控制的潛在靈活性。
  17. 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。
  18. The experimental result shows that the parametric curve of uniform interpolation in less than 6 rank is better in performance

    實驗表明，採用低階（一般小於6階）參數插值方程實現連接，效果好。
  19. Therefore. the thesis discusses the problem of smooth deformation parametric. solving method is to realize smooth merging of parametric curve by smoothing parametric curve

    這樣，本文又討論了參數曲線的光滑變形問題，解決的方法就是通過參數曲線的磨光法實現參數曲線的光滑度。
  20. Our study shows that it is a good choice to apply generalized rational parametric curve to interpolate and fit unorganized data, because it provides higher numerical stability by appropriately adjusting the support of basis functions

    最後應用廣義有理參數曲線對散亂數據進行插值擬合，它可以通過調整基函數的支撐域來優化方程的系數矩陣，因此提供了更高的數值穩定性。
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