曲面次數 的英文怎麼說
中文拼音 [qūmiàncìshǔ]
曲面次數
英文
surface degree- 曲 : 曲名詞1 (一種韻文形式) qu a type of verse for singing which emerged in the southern song and ji...
- 面 : Ⅰ名詞1 (頭的前部; 臉) face 2 (物體的表面) surface; top 3 (外露的一層或正面) outside; the ri...
- 次 : Ⅰ名詞1 (次序; 等第) order; sequence 2 [書面語] (出外遠行時停留的處所) stopping place on a jou...
- 數 : 數副詞(屢次) frequently; repeatedly
- 次數 : number of times; frequency
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They not only inherit the advantages of bezier curves and b - spline curves, also can be used to represent straight lines precisely and some remarkable transcendental curves precisely, such as circular arc, ellipse, cardioids and twisted pair line etc. especially, the uniform t - b - spline curve of three degrees is smoother than b - spline curve and c - b - spline curve of the same order
此外由於它們還具有三角函數的優點,故既可以精確表示直線段、二次多項式曲線段又可以精確表示圓弧、橢圓弧等二次曲線以及心臟線、雙紐線等超越曲線。特別地, 3次均勻t - b樣條曲線曲面比同階均勻b樣條( c - b樣條)曲線曲面具有更高的光滑度。As it can be expressed easily by argument equations, we use the conicoid as the criteria of points " classification. based on the point ' s normal and the adjacent field, corresponding to the conicoid equation such as plane, ball and cylinder, we search the points that fit the equation along the adjacent field. using this method, we realized the automatic classification of unorganized points
本文採用了可以比較方便地用參數方程表示的二次曲面作為數據點的分類標準,根據點的法向量以及其鄰域結點的各種屬性,對應于平面、球面、柱面等二次曲面,依據曲面方程的特點,從起始點開始沿鄰域深度優先遞歸尋找符合方程的數據點,實現了散亂數據點的自動分類。This paper studies the integration of advanced mathematics and language of computer, an example hyperboloid of one sheet is given
摘要以二次曲面為例,探討了計算機語言與高等數學教學的整合問題,並給出了一個單葉雙曲面的應用程序編寫實例。Parameters extraction of quadric surface based on real - coded genetic algorithm
基於實數編碼遺傳演算法的二次曲面提取Identifying and parameters extraction of quadric surface based on discrete point
基於離散點的二次曲面識別及參數提取Based on this milti - hierarchical model, application method for information organization of part is presented. chapter 3 proposes a new rule of arbitrary maximum angles of chord for triangulation and locale optimum, which avoides calculating angles of conventional methods in mesh simplification. moreover, with the introduction of arithmetical average windage concept, optimum method for the boundary mesh retriangulations is presented
第三章針對曲面網格簡化操作過程中出現的空洞剖分問題,討論層次模型的網格優化方法,提出了基於弦內角最大準則的局部網格簡化方法;針對網格曲面上存在的曲折邊界缺陷,提出以邊界輪廓算術平均偏差作為邊界曲折程度評定參數的邊界平滑優化剖分方法。In this thesis, the technology of visual fictitous design was used to design the level exchanged direction and double direction plough. first, the traction force formula of cylindrical plough face based on the prior study was deduced, and the forces of the solid model of circumrotatory pin was calculated, and visual dummy design technology was applied to analyse the force of circumrotatory pin and the parameter of pin
其次在前人研究的基礎上推導出圓柱型犁體曲面的牽引阻力公式;根據該公式計算出旋轉銷三維實體模型所受的力,根據該力運用可視化虛擬設計技術對模型進行受力分析,對旋轉銷的參數進行合理設計;根據牽引阻力公式計算出安全螺栓所受的力,根據該力運用虛擬設計技術對安全機構進行設計。In this paper, we first reconstruct a second order polynomial surface to approximate the original point model in the local area of each point, which is then restricted within a so - called - confidence region, producing a - surfel
摘要在每個點附近重建一個二次多項式函數曲面逼近原點模型,並根據逼近誤差將每個重建曲面限制在稱為置信鄰域的范圍內,從而形成一個面元。The results indicated that the dimension, shape and purity of base material could meet the functional demand of solid lubricant ; the thermal decomposition temperature of ptfe resin exceeds 400 c, but organic and inorganic packing filler added in ptfe made the water absorption rate of composite material increased, melting temperature and decomposition temperature decreased, in the meanwhile oxidative decomposition reaction was accompanied ; polar groups such as c = o, c - o - c and so on in the carbon fiber surface is advantageous to increase compatibility with other components and interlayer shearing strength ; uniform design experimental method could help to find the relationship between formula and frictional property by relatively small tests. the developing trend of each formula ' s friction coefficient could be showed by fitting curve ; the friction coefficient with no copper powder or graphite in formula was relatively big. this fact showed that copper powder and graphite should be used cooperatively ; it was found that when the ratio of copper powder to graphite by weight is 15 : 60, 30 : 30 - 40 and 60 : 15 - 30 respectively, the friction coefficient was relatively small. the degree of crystallinity of pure ptfe reached maximum by air cooling and the abrasion loss also reached maximum among three ones ; at the same time, the abrasion loss of solid lubricant sample was also the biggest among three ones ; when solid lubricant matched with 45 # steel axle or gcrl5 steel axle, lubricant transfer film could be formed on metal surface, thus direct contact between the surface of metal friction pair rings was reduced. their working life was elongated extremely ; there was mainly much graphite, a little ptff, moo3, feso4, cus and so on in lubricant transfer film
試驗結果表明:所選原料的尺寸、形狀及純度可滿足固體潤滑劑的性能要求;聚四氟乙烯樹脂熱分解溫度超過400 ,但在ptfe中加入無機填料會使復合材料吸水率提高,熔融溫度及分解溫度降低,且伴有氧化分解反應;碳纖維表面含有c = o及c - o - c等極性基團,有利於提高其與其它組分的相容性,提高層間剪切強度;均勻設計試驗方法能夠用較少的試驗次數找出配方與摩擦性能間的關系,擬合曲線基本能表示各配方的摩擦系數發展趨勢;配方中不加銅粉或不加石墨,其摩擦系數均較高,說明銅粉和石墨應該配合使用;當銅粉15份、石墨60份時,銅粉30份、石墨30 - 40份時,銅粉60 、石墨15 - 30份時,摩擦系數均具有較低值;純聚四氟乙烯樹脂在空氣冷卻時結晶度最大,磨損量也是三者中最大的;同時,固體潤滑劑試樣在空氣冷卻時的磨損量也是三者中最大的:不論是固體潤滑劑與45 #鋼軸配副或是固體潤滑劑鑲嵌入銅套后與gcr15鋼軸配副,在金屬表面均可形成潤滑轉移膜,從而減少金屬摩擦副表面間的直接接觸,大大延長其使用壽命;轉移膜中主要含有較多的石墨、少量聚四氟乙烯、 moo 。The exact expression is n = 4 ", in which n is the stage of koch curve. since we only consider one generator in computation process, so we simplify it as n = 4 ). the critical point of this kind of koch curve is zero, also called zero temperature phase transition, and this is the character of all the limited branching systems
無分支科赫曲線是一種典型的分形,前人的研究都局限於n = 4 ( n是用線元,面元,或體元覆蓋分形系統所需要的覆蓋次數,確切的應該寫成n = 4 ~ n ,其中n為科赫曲線的級,但我們在重整化群計算時只考慮一個生成元,所以簡化為n = 4 )情況,這種科赫曲線的相變點為零,是一種零溫相變,這也是有限分岔系統的相變特徵。In this paper, data acquisition and processing method is introduced, surface fitting and error estimation methods based on special scattered data is put forward
本文介紹了三維坐標數據的採集和數據處理方法,提出了基於空間離散點坐標進行二次曲面擬合及其誤差評定的方法。In proc. acm siggraph, 1994, pp. 303 - 309. 21 pottmann h, leopoldseder s, hofer m. approximation with active b - spline curve and surfaces
此處,我們引入了具有最小能量的控制曲線,由此降低了曲面次數並很好的控制了曲面的形狀。This process is as follows : firstly, the data of different section contour and of section line have been obtained by reverse - engineering ; secondly, non - uniform b - spline approximation algorithm is used to fit the discrete data ; then the data have been optimized and reduced by adopting adaptive sampling of key points of the fitted curve based on vertical distance, sequently the adaptive sampling data is transformed into the format of the. ibl file of the famous 3 - d design software pro / e. therefore we reconstruct the surface and a model is generated ; lastly, the effectiveness of the adopted algorithm and modeling approach are demonstrated by the experiments
建模型的過程中,首先運用逆向工程測量方法,獲得曲面物體上不同截面輪廓線的測量數據點列,接著對測量數據點進行平滑處理,用最小二乘法求解基於數據點列的控制多邊形,以非均勻三次b樣條曲線擬合截面輪廓曲線;然後利用基於垂距的數據采樣演算法,對擬合曲線上的數據點進行重新采樣,達到優化數據點的分佈及減少描述曲線數據量的目的。Two methods are given. one is obtained by using degree reduction of interval rational bezier curves in two parameter directions according to the character of tensor product, which is called " single step method ". by comparison for degree reductions produced by the different order in two parameter directions, the relationships of the approximation results are discussed
然後討論了矩形域上區間有理bezier曲面的降階問題,給出兩種降階演算法:一個是針對張量積的特點將問題轉變為兩參數方向的區間有理曲線的降階逼近,即「單步法」 ,並討論單步法沿兩參數方向不同次序降階的關系。Only clouds of points instead of grids are distributed over the computational domain and the spatial derivatives of the considered partial equations are estimated using a least - square curve fit on local clouds of points
與傳統的網格方法不同,無網格方法的核心是用「點雲」離散求解區域,並基於當地點雲離散結構,引入二次極小曲面逼近空間導數。While the plan has helped to reduce the heavy concentration of issuance at the short end of the efbn yield curve, the change was most notable in the six - month to two - year segment due to the time decay factor and the less frequent issuance and smaller issue size of longer date efn
該計劃有助減少外匯基金票據及債券收益率曲線集中於短期票據的情況,但由於時間消減因素,加上發行長期外匯基金債券的頻密程度較低,次數亦較少,上述安排帶來的轉變在6個月票據及2年期債券方面最為明顯。The contents of the thesis are summarized as follows : 1. by using curved - fitting method, calculation of local angular deflection of canvas plate is studied, with the help of cubic spine function, canvas plate is formed and then its local angular deflection is worked out. 2
本文所做的工作概括如下: 1 、運用曲面擬合方法研究帆形板局部角變形的計算方法,通過三次樣條函數建立船體帆形外板,然後計算得出帆形板的局部角變形。Firstly part of quadratic term of taylor series is chosen ; a low - dimension surface is used to approximate limit state surface ; and the modified reliability formula is derived
首次選取泰勒級數的部分二次項,用一個距原點最近點處擬合的超低維曲面近似極限狀態面。And the average illumination intensity can be figured out through statistic method. here, some kinds of traditional led ' s optical encapsulated structure were simulated using monte carlo method. and experiments were performed using the correspondent led ' s optical encapsulated structure with the same conditions just like what were used in simulation
採用二次曲面系數矩陣a統一描述任意二次曲面,給定系數矩陣a1 , a2 … , an , ( n為小於10的正整數) ,和描述曲面范圍的條件,就描述了一個完整的led光學結構模型供模擬。Especially when wang - ball forms are used, the time complexity for evaluating would be reduced from cubic to quadratic, of the degree of the surface
特別當採用wang - ball曲面時,演算法的時間復雜性將從曲面次數的立方降低到平方分享友人