游艇概念设计方法与技术研究

针对游艇的概念设计方法与技术展开研究,从创意设计思维层面入手,建立了游艇设计概念引入、意象及内涵深化的设计创意库,包括海洋生物库、东方文化符号库、其它类产品创意库等三大类;分析了游艇概念设计从抽象到具体的过程,提出了游艇创意概念设计的底影套模法;探讨了游艇设计的参数化、模块化实现技术。     

Efficient algorithms for counting parameterized list H-colorings

We study the fixed parameter tractability of the counting version of a parameterization of the restrictive list H-coloring problem. The parameterization is defined by fixing the number of preimages of a subset C of the vertices in H through a weight assignment K on C. We show the fixed parameter tractability of counting the number of list (H,C,K)-colorings, for the case in which (H,C,K) is simple. We introduce the concept of compactor and a new algorithmic technique, compactor enumeration, that allow us to design fixed parameter algorithms for parameterized counting problems.     

三维参数化工业管道系统的设计与应用

介绍了用VBA作为开发工具对AutoCAD进行二次开发,由二维图形直接绘制三维实体管道,用参数化设计方法构造了三维管件库,然后将管道和管件进行装配。对三维管道进行干涉检查,减少了工业管道系统的设计时间,易于提前发现设计错误,从而提高工作效率。     

On the two-degree-of-freedom Wiener–Hopf optimal design with tracking and disturbance rejection constraints

In this paper, the design of the two-degree-of-freedom optimal Wiener–Hopf controller with asymptotic tracking and disturbance rejection constraints is studied. Based on the solvability conditions and the solution parameterization of Diophantine equations over the stable rational fractional ring M(s), the disturbance rejection problem in the general case is solved. A simple cost function is defined to reflect the transient performance of control signal caused by deterministic signals. Finally, the design of the two-degree-of-freedom optimal Wiener–Hopf controller is presented.     

Parameterization for reconstruction of 3D freeform objects from laser-scanned data based on a PDE method

Published online: 19 July 2001     

压铸模标准模架参数化设计

采用AutoCAD二次开发语言－AutoLISP,在AutoCADR14环境下,开发了压铸模标准图形库系统。该系统包括对压铸模的镶块、套板、导柱、导套以及对这些零件进行校核和自动生成图纸的参数化设计。     

基于位图的点集表面表示及其渲染

提出了一种基于位图的点集表面表示形式：先对点集表面进行参数化，然后在参数域上进行曲面重构和重采样得到基于二维数组的点集表面表示。采用了切空间对齐的方法得到点集表面的参数坐标。该方法能寻找出点集代表的流型所在的二维参数空间，并存参数化过程中较好地保留了原曲面的尺度信息。位图形式表示点集表面具有数据结构简单和便于随机访问的优点。提出了基于位图表示形式的点渲染方法，该方法采用双线性插值来实现视角依赖的点集表面的重采样，解决了点渲染中采样点不足的问题。     

开铁口机旋转机构的参数化研究

借助虚拟样机技术,建立了转臂折叠式开铁口机的虚拟样机模型,并对其进行了运动学、动力学仿真分析。研究了旋转机构的几何尺寸对轨梁的运动轨迹及其速度变化的影响。为结构的进一步优化和机构动态特性的进一步改善提供了有意义的理论依据。     

Deadbeat control with disturbance rejection

A deadbeat control problem with disturbance rejection is considered for a SISO discrete time plant. Disturbances are supposed to enter into the input to the plant and the output from the plant. The two-degree-of-freedom controllers are employed to internally stabilize the feedback control system, to make the output of the plant track a reference signal and to reject the disturbances in the sense of the deadbeat response. Necessary and sufficient conditions for the problem to have a solution are shown. And the set of all controllers meeting the design requirements are represented using two free polynomials.