新技术的应用及其对DCS的影响

简要介绍了ＤＣＳ的一般特点及传统ＤＣＳ存在的不足，着重分析了现场总线、ＯＰＣ标准、Ｉｎｔｅｒｎｅｔ及ＷｉｎｄｏｗｓＮＴ等新技术对ＤＣＳ发展的影响，指出这些新技术的应用必将使ＤＣＳ的控制功能更加完善。     

Vector Fields: an Interactive Tool for Animation, Modeling and Simulation with Physically Based 3D Particle Systems and Soft Objects

Vectorfields have traditionally been used in computer graphics as a means of visualizing models over time. This paper presents a system which extends the use of vector fields as an interactive tool for physically based three dimensional particle systems and soft objects. The techniques implemented in the system provide the user with new flexibility in animation, modeling and simulation. This paper describes bounded interactive vectorfields and how they can be used to manipulate particle systems and a class of soft objects. Applications to animation, modeling and simulation are also presented.     

Engineering knowledge formalization and proposition for informatics development towards a CAD-integrated DfX system for product design

Target design methodologies (DfX) were developed to cope with specific engineering design issues such as cost-effectiveness, manufacturability, assemblability, maintainability, among others. However, DfX methodologies are undergoing the lack of real integration with 3D CAD systems. Their principles are currently applied downstream of the 3D modelling by following the well-known rules available from the literature and engineers’ know-how (tacit internal knowledge).This paper provides a method to formalize complex DfX engineering knowledge into explicit knowledge that can be reused for Advanced Engineering Informatics to aid designers and engineers in developing mechanical products. This research work wants to define a general method (ontology) able to couple DfX design guidelines (engineering knowledge) with geometrical product features of a product 3D model (engineering parametric data). A common layer for all DfX methods (horizontal) and dedicated layers for each DfX method (vertical) allow creating the suitable ontology for the systematic collection of the DfX rules considering each target. Moreover, the proposed framework is the first step for developing (future work) a software tool to assist engineers and designers during product development (3D CAD modelling).A design for assembly (DfA) case study shows how to collect assembly rules in the given framework. It demonstrates the applicability of the CAD-integrated DfX system in the mechanical design of a jig-crane. Several benefits are recognized: (i) systematic collection of DfA rules for informatics development, (ii) identification of assembly issues in the product development process, and (iii) reduction of effort and time during the design review.     

Optimal design of a redundantly actuated 4-legged six degree of freedom parallel manipulator using composite design index

This work attempts to develop a procedure for the optimal design of a redundantly actuated six degree of freedom parallel manipulator. A concept of composite design index is developed to deal with multi-criteria based design in a systematic manner, and this index is employed to obtain a set of optimal dimensions for this manipulator. Two different designs are investigated, and they are compared in terms of their local characteristics. Finally, the fault-tolerant capability afforded by redundant actuation is evaluated in terms of partial actuator failures.     

工业以太网技术的介绍和比较

近二十多年由于通信技术、计算机技术、网络技术的迅速发展,工业自动化控制领域也随之得到了迅速的提高和改革。自动化工程师不仅将这种新技术大胆地运用到工业实践,而且对如何将现代通信技术成功地应用到工业自动化控制问题进行了激烈的争论。事实证明现代自动控制的发展是与现代通信技术的发展紧密相关的。无论是现场总线还是工业以太网都对工业控制系统的分散化、数字化、智能化和一体化起了决定性的作用。因此学术上的争论将对我们如何看待工业以太网技术的迅猛发展有很大启示。本文对不同的工业以太网的技术作了简单的介绍,并作相应的比较,从而明确未来工业以太网技术的发展方向。     

基于UG的注塑模标准模架设计

ＢＡＳＥＣＡＤ系统数据库和程序参数化技术结合起来，利用人工智能的方法，基于ＵＧ的二次开发语言ＧＲＩＰ和Ｃ语言混合编程，在工程工作站开发而成，利用此系统主塑模模架直以观，形象具有选型迅速，设计正确的特点。     

基于作者主题模型和辐射模型的用户位置预测模型

由于全球定位系统（GPS）设备采集的用户历史位置数据通常具有稀疏性,使得基于单个用户数据的位置预测模型能力受限,所以结合人类移动性的时间和空间周期性,提出一种基于作者主题模型（ATM）和辐射模型（RM）的用户位置预测模型。在时间维度上,该模型利用ATM发现与目标用户移动行为相似的用户群,并确定该用户群在预测时刻所处的目标状态;在空间维度上,该模型利用RM算法计算目标用户的候选地点在目标状态下的概率,并通过比较各候选地点的概率值确定目标用户可能出现的地点,从而实现对目标用户位置的预测。实验结果表明,该模型的平均预测准确率为61.49%,相对于基于变阶的Markov模型提高近28个百分点。所提预测模型能够在单个用户数据量小的条件下获得更高的预测准确率。     

电除尘器设计中CAX的应用

本文阐述了在电除尘器设计中CAX的应用过程。通过基于知识工程的CAD可以优化电除尘器结构设计,通过CAE技术可以对电除尘器内部流场进行模拟仿真,通过VRML实现电除尘器虚拟整体装配和动态仿真。     

高压开关柜状态检修的研究

本文论述了高压开关柜的局部放电检测技术,提出以局部放电检测为基础的高压开关柜状态检修的技术方法,探索建立高压开关柜状态检修体系,全面保障高压开关柜的安全运行。