ZW系列弯管机床CAD系统的分析及设计

对中频弯管机床的计算机辅助设计系统进行了设计研究。介绍了所研制软件包的功能，综合分析了机床总体受力状态及有关参数间的制约关系，从而完成了机床总体及各部件的子程序模块设计。为满足中频弯管机系列化设计的需要，文中还涉及参数化图形库设计的内容。     

DIRECT ADAPTIVE CONTROL FOR NONLINEAR MATRIX SECOND‐ORDER SYSTEMS WITH TIME‐VARYING AND SIGN‐INDEFINITE DAMPING AND STIFFNESS OPERATORS

A direct adaptive control framework for a class of nonlinear matrix second‐order systems with time‐varying and sign‐indefinite damping and stiffness operators is developed. The proposed framework guarantees global asymptotic stability of the closed‐loop system states associated with the plant dynamics without requiring any knowledge of the system nonlinearities other than the assumption that they are continuous and bounded. The proposed adaptive control approach is used to design adaptive controllers for suppressing thermoacoustic oscillations in combustion chambers.     

Quad‐Mesh Generation and Processing: A Survey

Triangle meshes have been nearly ubiquitous in computer graphics, and a large body of data structures and geometry processing algorithms based on them has been developed in the literature. At the same time, quadrilateral meshes, especially semi‐regular ones, have advantages for many applications, and significant progress was made in quadrilateral mesh generation and processing during the last several years. In this survey we discuss the advantages and problems of techniques operating on quadrilateral meshes, including surface analysis and mesh quality, simplification, adaptive refinement, alignment with features, parametrisation and remeshing.     

基于有限元法的某铸铁机柱脚加固方案分析

某工程铸铁机基础由于设计原因,柱脚刚度不够,混凝土和螺栓被破坏.由于加固过程需兼顾螺栓、混凝土和柱脚钢柱,常规的手段已无法满足计算要求,故本文采用有限元软件,通过参数化分析,确定分析参数,得出最优加固方案,解决了实际工程问题。     

基于参数化的枪械外形设计策略

利用面向对象技术 ,对全枪外形以及外形离散件的参数化设计原理进行描述 ,通过 C语言的“类”对全枪外形、离散件外形、结构参数以及关联参数进行封装。对外形参数化研究的内容包括 :枪械外形的离散化 ,参数化模型的建立以及充分利用 CAD集成软件的图形功能对枪械外形参数化模型进行显示。经验证 ,采用这种方法开发的软件系统性能达到原设计指标要求。     

Social context cognition crowd‐sourcing and semi‐automatic parametrization

This paper presents a semi‐automatic method of parameterizing an existing social context cognition model. It discusses benefits of the social context cognition models for example in personality modeling and their key issue that is parametrization. It briefly introduces social context cognition model and describes a new method of its crowd‐sourcing‐based parametrization. Later, validation is provided, and ability to recreate social context cognition in the provided samples is presented with good generalization for the unknown cases. Finally, model's stability for the continuous stream of dynamic social context input data is shown. Presented system contributes to the believable agent modeling and social simulations by making much needed applications of social context cognition models easier by addressing the so far unsolved troublesome parametrization issues. Copyright © 2016 John Wiley & Sons, Ltd.     

The rational cubic Bézier representation of conics

The rational cubic Bézier curve is a very useful tool in CAGD. It incorporates both conic sections and parametric cubic curves as special cases, so its advantage is that one can deal with curves of these two kinds in one computer procedure. In this paper, the necessary and sufficient conditions for representing conics by the rational cubic Bézier form in proper parametrization are investigated; these conditions can be divided into two parts: one for weights and the other for Bézier vertices.     

An anti‐windup strategy for a feedback control system based on youla parametrization

In this paper, the design strategy of anti‐windup controller (AWC) for feedback control system is proposed. The proposed method is based on Youla parametrization of linear controllers in the framework of left coprime factorization. Conventional anti‐windup controllers have difficulty in optimization of parameters. The suppression effect of windup phenomena can be adjusted easily with the proposed AWC. The effectiveness of proposed method is shown with some numerical and experimental results. © 2002 Wiley Periodicals, Inc. Electr Eng Jpn, 139(4): 64–70, 2002; Published online in Wiley InterScience ( www.interscience.wiley.com ). DOI 10.1002/eej.10013     

标准齿轮柔性编码系统的设计与实现

开发了一个标准齿轮库,通过对齿轮标准部件的有机组合,能够快速生成通用需要的齿轮设计,系统实现上提出了灵活的柔性编码的思想,可以实现对部件的材料、外部尺寸、齿轮外廓曲线、齿数等参数灵活编码。     

挖掘机液压缸参数化设计及研究

通过二次开发工具UG/Open,以挖掘机工作装置中的液压缸为例,提出UG二次开发参数化设计方法.利用MFC实现UG对话框界面和后台数据库的连接,最终完成液压缸零件参数的自动提取,提高了零件的设计效率.