阀门产品CAD系统CAVDS的研究

应用参数化和复杂曲面造型设计方法，在大型ＣＡＤ软件ＥＵＣＬＩＤ上用二次开发语言研制了阀门产品ＣＡＤ系统ＣＡＶＤＳＤ。详细介绍了系统开发平台及结构、设计方法和开发中的一些技术问题。     

基于特征的参数化CAD建模

介绍了一种基于特征的参数化ＣＡＤ建模方法，该方法根据ＣＡＰＰ／ＣＡＭ所需要的几何特征信息，工艺特征信息及制造特征信息建立特征库，通过参数化设计过程完成零件设计，并为后续ＣＡＰＰ／ＣＡＭ的信息提取建立基础。     

箱体零件CAD／CAPP／CAM集成系统的研究与实践

在ＣＩＭＳ环境下，针对箱体零件ＣＡＤ、ＣＡＰＰ、ＣＡＭ信息集成的功能需求，在基于特征的箱体零件信息模型、工艺计划模型与服务于工艺设计的制造环境模型的支持下，开发出了特征造型，工艺设计及加工过程仿真与ＮＣ编程等子系统，从而完成了一个集成化的箱体零件ＣＡＤ／ＣＡＰＰ／ＣＡＭ系统。     

凸轮类零件的特征类型

特征造型技术是随ＣＡＤ／ＣＡＭ集成而发展起来的一种新型技术，文章讨论了印刷机凸轮类零件特征模型的建立过程，详细介绍了凸轮类零件特征造型ＣＦＭ系统的特征分类方法，特征库建立，以及零件生成的具体过程。     

基于参数化特征建模的信息集成系统—FVCAD

本系统在自行开发的二维参数化绘图系统ＶＣＡＤ基础上，建立一个三维特征征库，在零件的二维设计过程中采取以零件的方位面为单元建立机械零件的特征模型，实现ＣＡＤ／ＣＡＰＰ／ＣＡＭ的信息集成。     

面向并行工程的CAD系统研究

本文在ＣＩＭＳ环境下，以非回转体零件特征造型的基础上，其非回转体零件－－箱体对对象，应用并行工程技术，开发基于特征的三产体制造型系统。在生成工程图纸的同时更有效地与后续工序ＣＡＰＰ、ＣＡＭ进行信息集成。提供了一个更高层次的二次开发系统。     

DDE技术在参数化CAD中的应用

本文从分析现有微机参数化机械设计ＣＡＤ系统入手，指出了该类系统在进行的所谓参数化设计中所存在的问题和不足；同时推出了一项的参数化ＣＡＤ系统的设计技术－基于Ｗｉｎｄｏｗｓ应用间动态数据交换ＤＤＥ技术的参数化机械设计ＣＡＤ系统开发软件技术，文中阐述了基于ＤＤＥ技术的参数化ＣＡＤ系统开发的一般方法和应用环境。     

裁剪曲面的三角化及图形显示

结合自主版权的超人ＣＡＤ／ＣＡＭ系统的开发，本文提出了一种适合于裁剪曲面图形显示的曲面三角化算法，该算法将曲面的三角化转化为曲面参数域的三角化，并将二维图形的集合运算与Ｄｅｌａｕｎａｙ三角剖分应有和于曲面参数域边界的处理，从而使裁剪曲面在边界上的三角形分布均匀。     

基于特征的模具参数化设计方法

基于模具的特点，对模具特征的信息构成进行了研究。采用模具的装配特征和零件特征表达模具的装配关系和结构，采用层次结构表达特征信息，在参数化设计时，采用形状尺寸和结构尺寸驱动方式修改特征的形状和定位。该方法可方便模具的结构描述和参数化设计，有利于实现模具ＣＡＤ／ＣＡＭ系统的集成。     

MOCVD热力学分析软件的开发

报导了最新开发的ＭＯＣＶＤ热力学分析软件－ＭＯＣＶＤＴＡ，它是一个采用目前比较 ＶＣＳ算法对ＭＯＣＶＤ的稳态系统进行单参数及双参数分析的软件。介绍了其功能，特点，使用方法以及适用条件，并且以Ａｓ－Ｈ系统及Ｇａ－Ａｓ－Ｃ－Ｈ系统为例进行了模拟，得到了很好的模拟结果。     

Induction motor load impact on power system eigenvalue sensitivity analysis

Load modelling plays an important role in power system dynamic stability assessment. One of the widely used methods in assessing load model impact on system dynamic response is parametric sensitivity analysis. A composite load model-based load sensitivity analysis framework is proposed. It enables comprehensive investigation into load modelling impacts on system stability considering the dynamic interactions between load and system dynamics. The effect of the location of individual as well as patches of composite loads in the vicinity on the sensitivity of the oscillatory modes is investigated. The impact of load composition on the overall sensitivity of the load is also investigated.     

基于神经网络混合建模的结构振动滑模控制

将神经网络和标称系统混合建模方法引入到离散滑模控制当中,得到神经网络滑模控制,然后对结构振动进行控制,振动结构为具有不确定性参数的柔性附件,并受到随机外扰作用。离散滑模控制的滑模面是以标称系统为基础,由最优二次型价值函数求解黎卡提方程确定。利用标称模型和神经网络混合建模方法来减小系统的不确定性,达到提高滑模控制在实际控制系统中的控制效果。其中利用前馈神经网络来对不确定部分进行建模。最后通过对滑模控制和神经网络滑模控制进行仿真,结果表明,本文所提出的神经网络滑模控制对具有不确定性参数和随机外扰的柔性结构系统振动的控制效果要优于滑模控制。     

一类非线性不确定结构系统的鲁棒饱和主动控制

对一类非线性不确定结构系统研究了在外部干扰下的鲁棒饱和主动控制策略.将质量、阻尼、刚度矩阵都存在不确定的结构系统描述为一种不确定中立系统,采用鲁棒饱和主动控制策略,提出基于线性矩阵不等式的代数解.通过提出的控制方法同时保证了结构系统在模型和参数摄动下以及在控制变量和扰动存在非线性不确定性时的鲁棒稳定.最后通过对一个4层建筑大楼在地震波作用下的主动振动控制仿真证明了该方法的有效性.     

改性混凝土在公共坐具设计中的应用

目的基于混凝土材料的改性问题,总结出改性混凝土公共坐具的设计要点和表现形式,尝试在建造技术与发展过程中,利用参数化设计手段进行创新设计。方法分别从功能、造型、质感设计方面,对改性混凝土公共坐具设计案例进行分析,归纳出功能模块自由组合、超高性能与弯曲造型、不同材料混搭共生三方面的设计要点,并据此尝试利用参数化技术介入设计与建造过程,进行改性混凝土公共坐具设计实验。结果改性混凝土坐具设计通过混凝土外加剂的添加、参数化设计方法的应用,不仅能满足一般公共坐具设计的功能要求,还能展现出使用者的个性需求。结论随着新材料、新技术的不断应用,混凝土坐具不再只是作为艺术品陈设,更可通过添加外加剂、掺合料来创造出超性能的产品,赋予其更多的价值与内涵。改性混凝土材料的设计视域必将更加广阔,应用前景也将更值得期待。     

Review of the systems biology of the immune system using agent‐based models

The immune system is an inherent protection system in vertebrate animals including human beings that exhibit properties such as self‐organisation, self‐adaptation, learning, and recognition. It interacts with the other allied systems such as the gut and lymph nodes. There is a need for immune system modelling to know about its complex internal mechanism, to understand how it maintains the homoeostasis, and how it interacts with the other systems. There are two types of modelling techniques used for the simulation of features of the immune system: equation‐based modelling (EBM) and agent‐based modelling. Owing to certain shortcomings of the EBM, agent‐based modelling techniques are being widely used. This technique provides various predictions for disease causes and treatments; it also helps in hypothesis verification. This study presents a review of agent‐based modelling of the immune system and its interactions with the gut and lymph nodes. The authors also review the modelling of immune system interactions during tuberculosis and cancer. In addition, they also outline the future research directions for the immune system simulation through agent‐based techniques such as the effects of stress on the immune system, evolution of the immune system, and identification of the parameters for a healthy immune system.Inspec keywords: reviews, cancerOther keywords: review, system biology, agent‐based models, immune system, vertebrate animals, human beings, disease, gut nodes, lymph nodes, tuberculosis, cancer     

Modernization of a conceptual model of a data bank for physicotechnical effects based on contemporary information technology

Requirements for a conceptual model of a data bank for physicomechanical effects and methods for achieving them are studied. On the basis of presenting converters as an information system, a method for modelling them is suggested based on the theory of an energy-information model, parametric structural schemes, SADT-technology, and an objectively orientated paradigm. Advantages of the conceptual model developed are discussed. __________ Translated from Izmeritel’naya Tekhnika, No. 1, pp. 7–9, January, 2007.     

Parametric code for generation of finite‐element model of nonwovens accounting for orientation distribution of fibres

A novel finite‐element modelling code developed to investigate the structural behaviour of nonwoven materials is presented. The technique allows modelling of a nonwoven fabric as a continuous–discontinuous medium with a given pattern of bond points and a large number of constituent fibres with arbitrary orientation distribution. The parametric feature of the code provides automatic modelling of nonwoven materials according to design parameters in a very efficient way. The effect of fibre length is also included for the first time in a finite element model of a nonwoven. The developed code is very flexible and it is possible to be extended to further studies such as damage behaviour.Copyright © 2013 John Wiley & Sons, Ltd.     

面向工程的专用产品参数化CAD系统的研究

 针对目前参数化CAD系统的不足，提出了面向工程的参数化思想，引入了功能约束，分析了对功能约束进行处理的3种方法．采用了基于特征的参数化造型方法，用应用层、描述层和图形层三层体系表达基于特征的参数化模型，将该模型作为参数驱动的基础．将设计中的约束分为3类：工程约束、适配约束和几何约束．通过适配约束在工程约束与几何约束间建立映射关系，使得参数化设计系统既可以受几何参数的驱动，又可以受工程参数的驱动，从而扩大了CAD技术对设计过程支持的范围。     

Global parameterization of a topological surface defined as a collection of trimmed bi‐parametric patches: Application to automatic mesh construction

We describe a new geometric algorithm to map surfaces into a plane convex area. The mapping transformation is bijective; it redefines the whole surface as a unique bi‐parametric patch. Thus this mapping provides a global parametrization of the surface. The surfaces are issued from industrial CAD software; they are usually described by a large number of patches and there are many shortcomings. Indeed, the decomposition into patches depends on the algorithm of the geometric modelling system used for design and usually has no meaning for any technological application. Moreover, in many cases, the surface definition is not compatible, i.e. patches are not well connected, some patches are self‐intersecting or intersect each other. Many applications are hard to address because of these defects. In this paper we show how patch‐independent meshing techniques may be easily automated using a unique metric in a plane parametric space. Thus we provide an automatic procedure to build valid meshes over free‐form surfaces issued from industrial CAD software (Computer Aided Design: this terminology should refer to a large amount of software. For the scope of this paper we only refer to geometric modelling systems. Indeed geometric modelling systems remain the kernel of many CAD software). Copyright © 2002 John Wiley & Sons, Ltd.     

On the classical shell model underlying bilinear degenerated shell finite elements

We study the shell models arising in the numerical modelling of shells by bilinear degenerated shell finite elements. The numerical model of a cylindrical shell obtained by using flat shell elements is given an equivalent formulation based on a classical two‐dimensional shell model. We use the connection between the models to explain how a parametric error amplification difficulty or locking is avoided by some elements. Copyright © 2001 John Wiley & Sons, Ltd.