Approximation method based on qurbs ( quasi - uniform rational b - spline ) is adopted and a iterative algorithm is introduced to improve the precision in the paper 在曲面片的逼近中采用边界替换算法以保证曲面片具有公共的边界曲线,所以达到gc ~ 0连续。
This paper puts forward a new method for calculating anomaly area - the polygonous approximation method , and gives corresponding algorithm and precision - controlling technique 摘要提出一种新的异常面积计算方法多边形逼近法,并给出相应的算法和精度控制方法。
Secondly , analysed the approach model , described circular arc approximation method , approaching blade curved surface with this method and realized raise of the approach speed 其次,分析了逼近模型,推导了单圆弧逼近方法,用这一方法来逼近叶片曲面,提高了逼近速度。
Depending on the image method and point source approximation method , the physic model was established , and the formula of photo - current versus surface recombination velocity was obtained 导出了光电流与表面复合速率相应关系的计算公式,确定了可进行电量测量的实验装置。
Secondly , as for degree reduction of interval rational bezier curves , two methods are given : pseudo linear programming method ( plpm ) and pseudo optimal approximation method ( poam ) 接下来对区间有理bezier曲线,给出两种降阶逼近算法:拟线性规划法( plpm )和拟最优逼近法( poam ) 。
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,计算各点的邻近点集,选取合适的局部基础曲面,把邻近点集投影到相应的局部基础曲面。
A parabolic regularity ( viscosity method ) and difference schemes in the rectangle mesh is constructed and convergence rata is obtained in the norm l1 . his approximation method is lately called kuznetsov approximation t 85 ]得到补偿紧引理,并推得著名的div一curl引理,他给出了当一致l加估计序列的任意嫡消失测度在式
In each step of the sequential design , an individual controller is designed by the robust frequency response approximation design procedure , the controller order is reduced by a frequency response approximation method 在序列控制器设计的每一步,单个鲁棒控制器用鲁棒频域响应近似法获得,并使用频域响应近似法进行控制器降阶。
Second part , using approximation method and implicit function theorem , we obtain the existence of large amplitude 2 - periodic bouncing for damped linear impact osillator with mutiple impacts in one period 在第二部分里,我们运用逼近框架与隐函数定理,对于带小阻尼的线性碰撞振子,证明了在一周期内发生多次碰撞的大振幅2 -周期解的存在性。
The expressions for correlation functions , power spectrum and correlation time of the intensity of a single - mode laser driven by two white noises with a exponential function correlation form were calculated by linear approximation method 应用线性近似方法,计算了具有指数形式关联的两白噪声驱动下单模激光光强的关联函数、功率谱及关联时间。