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1. According to the at minicar project of chongqing changan automobile co . ltd . , a series of researches have been carried out . base on the characteristic tests of engine and torque converter , the mathematical models are established using curve fitting
   在發(fā)動機性能試驗與液力變矩器性能試驗的基礎(chǔ)上，采用曲線擬合的方法得到了發(fā)動機及液力變矩器的數(shù)學(xué)模型，并對兩者聯(lián)合工作的輸入、輸出工作特性進行了分析。
2. 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(shù)建立船體帆形外板，然后計算得出帆形板的局部角變形。
3. Paper [ 76 ] provides a integer algorithm for rasterizing free curves , we need change the curve form to implicit function form , then use curve ' s positive - negative property to draw , but we ca n ' t use this algorithm when curve ' s degree is higher than 3 and this algorithm ca n ' t avoid using multiplication ; paper [ 77 ] provides a new generating algorithm , this algorithm can draw bezier very well , but for b - spline curve , we need use convert them into bernstein base form . because this process spends a lot of time , this algorithm has not a good speed and effect for rendering rational b - spline curve
   現(xiàn)在經(jīng)常采用的算法也是基于幾何的算法(即線式生成算法)和基于像素的算法(點式生成算法) ;文獻78 ]提供了一種有理參數(shù)曲線的快速逐點生成算法，該算法對有理b吮ier曲線的繪制，能起到很好的作用，但是對于有理b樣條曲線，必須先通過多項式的代數(shù)基與bemstein基間的變換矩陣，把原式用bemstein基表示，這一過程由于計算量大，降低了曲線生成的速度和效率
4. When applying the conventional fourier pseudospectral method on cartesian grids , curved interfaces are represented in a " staircase fashion " causing spurious diffractions . it is demonstrated that these non - physical diffractions can be eliminated by using curved grids that generally follow all curved interfaces
   在直角坐標(biāo)系下用傳統(tǒng)偽譜法模擬地下界面時，彎曲起伏的連續(xù)界面會因離散化而成為階梯狀界面，這種階梯狀界面在模擬波的傳播時，將產(chǎn)生人為繞射，降低合成記錄的精度。
5. As the basic concept , the first step is to modeling by ug . there is different model between propeller and commonly hardware , so we must be use curve modeling , at the same time , characteristic modeling and entity modeling in the whole process . first , we apply offset data for spline fit curve , then scanner smooth curve face
   首先在三維繪圖軟件ug中對螺旋槳及葉片進行三維建模,由于螺旋槳的造型不同于一般零件的cad造型,故在造型過程中同時采用了曲面造型,特征造型和實體造型幾種方法,先由型值數(shù)據(jù)生成樣條曲線,再由樣條曲線掃掠生成平滑的曲面,最后通過圓整?延伸得到螺旋槳的三維模型。