On the base of deducing meshing theory , by simplifying the parameters and using software , the 3d model of the rolling cone - type toroidal drive is given . and the parametric models are realized . the assemble chart of drive is given 在啮合理论推导的基础上，通过对滚锥齿超环面行星蜗杆传动的各参数进行简化处理，利用计算机软件对滚锥齿超环面行星蜗杆传动进行了三维实体参数化建模，实现了模型的参数化，给出了该传动的装配图，并进行了动态仿真。
Corneal surfaces in eyes with regular astigmatism are thought to be toroidal surfaces . based on mathematical models for corneal surfaces before and after treatment , a corneal ablation model is given for such refractive errors as spherical myopia , compound myopic astigmatism , and simple myopic astigmatism . a similar corneal ablation model is also given for such refractive errors as hyperopia , compound hyperopic astigmatism , and simple hyperopic astigmatism 采用超环面( toroidalsurface )建立起规则散光下的角膜曲面模型方程;定量研究了手术光学区屈光不正两种通用的矫正模型,一种模型适用于单纯近视、复性近视散光、单纯近视散光的矫正,另一种模型适用于单纯远视、复性远视散光、单纯远视散光的矫正;另外,作为影响手术效果的重要因素,提出了一种用于光学区直径和过渡区宽度均可调节时过渡区角膜切削量的计算模型。
The process has an advanced principle . the involute hourglass worm drive can realize the design machining of gear form and direction , and the internal meshing honing gear has high efficiency . this process has all merits mentioned above , and also has the advantages of quality stability , high productivity for rude and finish machining 该工艺原理先进，它集有利于实现齿形、齿向设计加工的渐开面环面蜗杆传动与高效的内啮合珩齿的优点与一体，对齿轮的粗、精加工都有质量稳定、生产效率高的优点。
In order to improve the level of automation design for the plane double - enveloping worm - gear reducer , this paper developed a cad prototype system for the reducer . the cad prototype system included two parts : 1 ) the optimization design software of the parameter for the worm gear was written by visual basic 6 . 0 ; 2 ) the parameter modelling software for the reducer was developed by using autocad2000 / vba 为了提高平面二次包络环面蜗杆减速器的自动化设计水平，针对目前国内还没有平面二次包络环面蜗杆减速器的计算机辅助设计软件这一现状，本文研究和开发了平面二次包络环面蜗杆减速器cad原型系统：用当今比较流行的可视化软件visualbasic6 . 0开发专门用于平面二次包络环面蜗杆传动的优化设计系统；用autocad2000 / vba开发的中心距从80mm到710mm的平面二次包络环面蜗杆减速器的参数化建模软件系统。
By means of the optimization method - punishing function method and taking the sum of the planet gear radius and center distance as the target function , the parameters of drive are optimized . by using the optimization program , the initial serial studies of drive are completed , the best serial parameter value of the drive is given 采用外点罚函数优化方法，通过取行星轮半径和中心距之和作为优化目标函数，对滚锥齿超环面行星蜗杆传动进行了参数优化，运用此优化程序，初步完成了对该种传动的系列化研究，给出了传动系列的最佳参数取值。
This paper provides the functional equation and parametric expression of rooted near triangulations on the torus with the size and the valency of the root - face as two parameters , and gives an explicit formula for the number of rooted near triangulations of the root face valency one on the torus with the size as a parameter 本文提供了环面上带边数和根面次这两个参数的有根近三角剖分的函数方程及其参数表达式,并给出了根面次为1以边数为参数的有根近三角剖分地图的精确解
In the proposed three types of chaos generator belonging to this chaos family , the period - doubling - bifurcation route to chaos is observed , and in the type - in chaos generator , the torus - breakdown route to chaos is also observed . it would be a firstly observed phenomenon that the period - doubling - bifurcation route to chaos and the torus - breakdown route to chaos coexist in a same system , and it is a rarely observed phenomenon that the route of torus - breakdown to chaos can be observed in a third - order ordinary differential system 此平方混沌族中的三类模型都表现出了倍周期分岔到混沌的过程，而在第类结构中可以观察到环面破裂和倍周期分岔两种不同的通向混沌的途径，在同一个系统中可以观察到环面破裂和倍周期分岔两种不同的通向混沌的途径，相信是混沌生成研究方面的首次报道；在三阶自治系统中可以观察到环面破裂，这也是一个很少见的现象。
In order to manufacture this type of worm gear drive precisely and cheaply , we should explore a whole new dis - dual generating method . as a part of the project " the modeling and simulation of planar double - enveloping toroid worm gear drive ' s intelligent manufacturing method " , this dissertation focuses on the 3d modeling of planar double - enveloping toroid worm gear in computer . the author of this dissertation has completed lots of studies and researches in this field and has found some new methods for the 3d modeling of worm gear drive 本文作为“平面二次包络环面蜗杆副智能加工的建模与仿真”研究项目的一个组成部分，主要以在计算机中对平面二包蜗杆副进行三维建模和数字化造型为目标，在严格推导共轭齿面的基础上对平面二包蜗杆副齿面的组成进行了tca分析，并运用适当的数学方法对蜗杆副型面进行重构，获得了适合于计算机表达的平面二包蜗杆副三维数字化模型。
The keep with bounds were be fuzzy by the method of oblige line . this program not only has been used to optimization the pdew but also could used to control the fuzzy factor that could change the strength of fuzzy . when the fuzzy factor equal to one , the fuzzy optimization program could change to a general optimization program 该优化设计程序不仅适应于平面二次包络环面蜗杆传动的模糊优化，而且可以改变模糊因子的大小，控制约束条件的模糊程度，甚至变换为常规的优化设计程序，程序的适用范围较广。
