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圆弧曲线     
相关语句
  circular arcs
     Methods for analyzing parametrization of rational Bézier curves representing circular arcs with degree three/four
     有理三次/四次Bézier圆弧曲线参数化的分析方法
短句来源
     Approaches of representing circular arcs with NURBS of degree two
     基于NURBS的圆弧曲线表示方法
短句来源
     So-called normal circular arc gear, refers is with it conjugate basic gear-rack plane of normal section tooth profile is the curve —basic tooth profile curve which several sections of circular arcs curves organically is connected constitutes.
     所谓法面圆弧齿轮,指的是与之共轭的基本齿条的法截面齿形是几段圆弧曲线有机地相连所构成的曲线——基本齿廓曲线。
短句来源
     Also, a geometrically constructive method for representing circular arcs using NURBS of degree three is given. The neccessary and sufficient conditions for the representation of circular arcs by uniform rational B-spline curves of rational Bener curves of degree three can be obtained as the special cases of the NURBS curves.
     二是已知一圆弧曲线,怎样用三次NURBS曲线精确地表示.给出了圆弧曲线的三次NURBS表示的几何构造算法.均匀有理B样条曲线和有理Bezier曲线精确地表示圆弧曲线的充要条件可作为NURBS曲线的特殊情形得到.这些研究结果为NURBS应用于CAGD,CAD/CAM提供了一个有用的工具.
短句来源
     1.Rational pentagagonal Bezier representation of circular arcsBezier curve plays an important role in the fields of computer aided geometry design (CAGD) and computer aided modeling, A Bezier curve is determined only by control points ,so it's conveninent and intuitive for designing. But there is a drawback that classical conic curves including circular arcs which frequently occur in CAGD/CAM can't be exactly represented with Bezier curves.
     Bézier曲线在计算机辅助几何设计(CAGD)及计算机辅助制造(CAM)中享有特别重要的地位,它仅由控制顶点决定用于设计既方便又直观,但它却不能表示CAGD及CAM中常用的经典二次曲线,包括圆弧曲线,因此用有理参数形式精确表示这些曲线有着非常重要的理论价值和应用价值。
短句来源
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  arc curve
     Symmetrical Variable Curvature Circular Arc Curve and Its Application in Circular Arc Spline Curve
     变曲率对称圆弧曲线及其在圆弧样条拟合中的应用
短句来源
     Because the normal section tooth profile of basic gear-rack is the circular arc curve, the normal circular arc gear has two malpractices that are the sensitivity of theoretically contact position to inaccuracy to be too big and the insufficient gear flexural strength.
     由于基本齿条的法截面齿形是圆弧曲线,法面圆弧齿轮存在着理论接触位置对误差的敏感性太大与法面圆弧齿轮的弯曲强度不足两个弊端。 文献中的“准端面”圆弧齿轮正是在这样的背景下提出的。
短句来源
     There are examples for NC machining process for Archimedes spiral push surface of slide bearingand a practical double arc curve fitting mehtod for programming of NC machining. Analysis is made on someproblems in its NC machining.
     论述滑动轴承上一种阿基米德螺旋线推力曲面的数控加工方法,以及编制数控加工NC程序的双圆弧曲线拟合实用方法,举出应用实例,并分析了数控加工时应注意的几个问题。
短句来源
     This article describes the application and construction technology of changing shape method in surveying of circular arc curve which is convex outside and concave inside.
     介绍换形法在外凸内凹圆弧曲线测量中的应用及施工放样技术
短句来源
     In this paper,the method is studied of blade's solid modeling by Pro/Engineer. Circular arc curve and B-spline are used differently to instruct cross sections that are blended to solid modeling. The example testified the method is feasibly and surface of model is analyzed.
     探讨了用Pro/E软件对汽轮机叶片进行实体造型的方法,分别采用圆弧曲线和B样条曲线对叶片截面型线进行处理,用曲面混合对各截面进行放样,对2种造型结果进行了比较,并用实例证明了该方法的可行性,最后对生成的实体表面进行了曲面分析。
短句来源
  circular arc curve
     Symmetrical Variable Curvature Circular Arc Curve and Its Application in Circular Arc Spline Curve
     变曲率对称圆弧曲线及其在圆弧样条拟合中的应用
短句来源
     Because the normal section tooth profile of basic gear-rack is the circular arc curve, the normal circular arc gear has two malpractices that are the sensitivity of theoretically contact position to inaccuracy to be too big and the insufficient gear flexural strength.
     由于基本齿条的法截面齿形是圆弧曲线,法面圆弧齿轮存在着理论接触位置对误差的敏感性太大与法面圆弧齿轮的弯曲强度不足两个弊端。 文献中的“准端面”圆弧齿轮正是在这样的背景下提出的。
短句来源
     This article describes the application and construction technology of changing shape method in surveying of circular arc curve which is convex outside and concave inside.
     介绍换形法在外凸内凹圆弧曲线测量中的应用及施工放样技术
短句来源
     In this paper,the method is studied of blade's solid modeling by Pro/Engineer. Circular arc curve and B-spline are used differently to instruct cross sections that are blended to solid modeling. The example testified the method is feasibly and surface of model is analyzed.
     探讨了用Pro/E软件对汽轮机叶片进行实体造型的方法,分别采用圆弧曲线和B样条曲线对叶片截面型线进行处理,用曲面混合对各截面进行放样,对2种造型结果进行了比较,并用实例证明了该方法的可行性,最后对生成的实体表面进行了曲面分析。
短句来源
  “圆弧曲线”译为未确定词的双语例句
     The arithmetic was based on thecircular-spline technology, respectively realized the high-precision approach betweenthe circular arc and the complex surface’s normal transversal and that the projectioncurve of the blade.
     该算法基于圆弧样条技术,实现了圆弧对曲面法截线和圆弧对刀刃投影曲线的高精度逼近,并利用圆弧曲线易于求取偏置线的特性,设计了高精度的行距计算算法。
短句来源
     In order to effectively approximate the circular arc and the circle as well as the spherical surface and the sphere,the parameter Bézier form polynomial approximants of circular segments and spherical patches are obtained by minimizing the defined distance function with respect to the best least squares norms L_2. Meanwhile these approximants are expressed as the quotient of two determinants.
     为了能更好地对圆弧曲线段和球面曲面片进行逼近,提出了一种基于最小二乘范数的参数Bézier多项式逼近方法。 该方法根据在最小二乘范数L2下所定义的距离函数取最小值,首先得到了一个圆弧曲线段和球面曲面片的参数Bézier多项式逼近式,并把该逼近多项式表示成两个行列式的商的形式。
短句来源
     THE CALCULATION OF CIRCULAR CURVED BEAM FIXED END FORCES
     圆弧曲线杆的固端力计算
短句来源
     A conventional EDG design is based on the Rowland circle on which the end points of the input and output waveguides located.
     原有EDG采用Rowland圆设计,输入输出在圆弧曲线上由条形波导引出。
短句来源
     The contrast trials for the pressure loss and separation efficiency between the arc-curve inlet channel and the involute-curve inlet channel shows that the arc-curve inlet channel can replace the involute-curve inlet channel.
     通过圆弧曲线流道入口与渐开线曲线流道入口的压力损失及分离效率的对比试验,证实可以用圆弧曲线流道入口代替渐开线曲线流道入口。
短句来源
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  circular arcs
The trajectory consists of line segments and circular arcs.
      
"Extremal" nozzles designed by variational methods in the absence/presence of internal shocks (I), so-called "truncated" nozzles with a uniform characteristic (II), and nozzles designed by the method of conjugate circular arcs (III) are considered.
      
The thrust characteristics of nozzles designed by the method of conjugate circular arcs for both inviscid and viscous flow are inferior to those of extremal nozzles by 0.7-1%.
      
The end field is formed with the help of wire sections in the form of straight lines and circular arcs, which permits an accurate control of geometrical dimensions.
      
The use of the method is exemplified by calculating the characteristics of a gas-drop flow in curved channels in which the generatrices of the lateral surface consist of circular arcs.
      
更多          
  arc curve
Precise bi-arc curve fitting algorithm for machining an aspheric surface
      
  其他


In this paper a construction method of simple double circular arcs for fitting template curves are given. Linear cutting automatic programming is practiced on 108-B computer. Using CKX-1 digital control linear cutting machine, blade templates are generated. The generated curves are smooth and of high exactness. Practice shows that this method is convenient and realizable.

本文介绍了一种简便的双圆弧曲线的构造方法,并用它来拟合样板曲线,在108—乙电子计算机实现线切割自动编程,经CKX—1数控线切割机加工样板,曲线光滑、精度高,实践证明了这种方法是简便可行的。

Basing upon the equilibrium conditions of a minute segment of space-curvedprestressing tendon, theoretical formulae are derived in this paper for calcula-ting the frictional losses of prestress in the tendon. It is proved that the formulae are the same as that generally used for frictional losses in plane-cur-ved tendons, provided the space-curved section length measured from the tension-ing end to the testing point and its subtended space angle are taken for the are-length S and subtended angle θ in the formulae...

Basing upon the equilibrium conditions of a minute segment of space-curvedprestressing tendon, theoretical formulae are derived in this paper for calcula-ting the frictional losses of prestress in the tendon. It is proved that the formulae are the same as that generally used for frictional losses in plane-cur-ved tendons, provided the space-curved section length measured from the tension-ing end to the testing point and its subtended space angle are taken for the are-length S and subtended angle θ in the formulae respectively. Subsequenfly, theformulae for determing the are length S and the subtended angle θ of the twocommonly used space-curved tendons, solenoidal curve and circular are on a ey-lindrical surface, are given and the method for simplification of the calculation as well as the error thus induced are discussed. Comparison of the calculatedresults with the measured on a model test shows close agreement in numericalvalue and their patterns of variation are also alike.

本文根据预应力空间曲线束微段的平衡条件,导得了空间曲线预应力束因摩擦引起的预应力损失理论计算通式。证明:对于空间曲线束,这一损失仍可按通用的平面曲线束的相应公式计算,惟公式中(μθ+kx)的θ角应取张拉端至验算点的空间包角,而x相应的取空间曲线弧长。本文还给出了常用的二类空间曲线束(如螺旋曲线和圆柱面上的圆弧曲线)空间包角θ和弧长S的计算公式,并讨论了简化计算方法以及由此而引起的误差。将理论计算结果与某工程模型试验中实测结果作了比较,不仅二者变化规律相同,而且数值也很接近。

A simple algorithm of constructing a curve of arcs and the proof of its converge- nce are both given in this paper. Let S and k(s) be the arc length and curvature function respectively,⊿ be any divison of [0,1] △:0=S_0

A simple algorithm of constructing a curve of arcs and the proof of its converge- nce are both given in this paper. Let S and k(s) be the arc length and curvature function respectively,⊿ be any divison of [0,1] △:0=S_0

E.Mehlum 提出了对分段线性的曲率函数作阶梯逼近时的圆弧曲线的收敛性问题。本文对于一般的曲率函数 k(s),在给定一个端切向的条件下,给出了圆弧曲线的一种简单算法,证明了它的收敛性且极限曲线的曲率即为 k(s)。因此,本文也即用几何样条的逼近方法,给出了平面曲线基本定理的一个构造性证明,便于数值计算而不需求解微分方程。

 
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