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INTEGRATED LAYOUT DESIGN OF CELLS AND FLOW PATHS

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Chinese Journal of Mechanical Engineering 2003年第3期16卷 225-228页

作者： Li Zhihua zhong yifang Zhou Ji cad center, huazhong university of science and technology,wuhan 430074, china cad center Huazhong University of Science and Technology Wuhan 430074

The integrated layout problem in manufacturing Systems is investigated. Anintegrated model for Concurrent layout design of cells and flow paths is formulated. A hybridapproach combined an enhanced branch-and-bound algorithm with a simulated annealing scheme isproposed to solve this problem. The integrated layout method is applied to re-layout the gear pumpshop of a medium-size manufacturer of hydraulic pieces. Results show that the proposed layout methodcan concurrently provide good solutions of the cell layouts and the flow path layouts.

关键词： Facility layout Integrated layout design Material flow network Manufacturing system

Multi-User Collaborative Assembly Planning over the Internet

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Computer Aided Drafting,Design and Manufacturing 2003年第1期13卷 39-47页

作者： Wang Junfeng Liu Jihong zhong yifang cad center, huazhong university of science and technology, wuhan 430074, china cadcenter HuazhongUniversityofScienceandTechnologyWuhan430074China

Due to the increasing complexity of products and for the distributed product development, more closely collaborative work among designers is required. A collaborative assembly planning approach is proposed to support assembly planning in a networked environment. The working procedure is depicted and the key techniques including collaborative-planning-oriented assembly decomposition modeling, assembly assignment modeling, and sub-plans merging are addressed. By incorporating visual models at client side with assembly application models at server side, a web-based supporting environment for collaborative assembly planning has been developed using VRML and Java-EAI techniques. A case study is given to illustrate the feasibility and validity of the idea.

关键词： collaborative assembly sequence planning decomposition and assignment modeling sequences merging internet

Research and Development on Manufacturing Enterprise Integration Framework

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Computer Aided Drafting,Design and Manufacturing 2002年第2期12卷 44-55页

作者： Zhang Jinsong Liu Qinghua Wang Qifu Wan Li Xiong Tifan zhong yifang cad center, huazhong university of science and technology, wuhan, 430074, china

Currently many enterprises have established some independent application systems such as cad, CAPP, CAE and so on. Enterprise information integration makes these information islands connected, and thereby forms a uniform enterprise-wide information environment. First this paper discusses the main research contents of enterprise integration. Then the author introduces an Internet-based configurable and open information integration framework, and presents a multi-tier integration architecture based on reusable component. Finally a development case of enterprise integration framework is introduced.

关键词： enterprise integration information integration framework multi-tier application architecture

DELAUNAY TRIANGULATION METHOD OF CURVED SURFACES BASED ON RIEMANNIAN METRIC

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Chinese Journal of Mechanical Engineering 2003年第1期16卷 91-93页

作者： Zhao Jianjun Wang Qifuzhong yifang Zhou Ji ZhaoYicad center,huazhong university of scienceand technology,wuhan 430074, china cad center huazhong university of science and technology Wuhan 430074 China

A method for quality mesh generation of parametric curved surfaces isproposed. It is shown that the main difference between the proposed method and previous ones is thatour meshing process is done completely in the parametric domains with the guarantee of meshquality. To obtain this aim, the Delaunay method is extended to anisotropic context of 2D domains,and a Riemannian metric map is introduced to remedy the mapping distortion from object space toparametric domain. Compared with previous algorithms, the approach is much simpler, more robust andspeedy. The algorithm is implemented and examples for several geometries are presented todemonstrate the efficiency and validity of the method.

关键词： Mesh generation Riemannian metric Delaunay triangulation Curvedsurfaces

cad/CAE OF THE WORKING CHARACTERISTICS OF A NEW TYPE OF FLUID COUPLING SHOCK ABSORBER

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Chinese Journal of Mechanical Engineering 2002年第3期15卷 222-227页

作者： Yang Ping zhong yifang Zhou JiSchool of Mechanical science and Engineering, huazhong university of science and technology,wuhan 430074, chinaLiu Yong Guilin Institute of Electronic technology School of Mechanical science and Engineering Huazhong University of Science and Technology Wuhan 430074

For purpose of simulation of the working characteristics of a new type offluid coupling shock absorber for vibration protection of sensitive equipment, a physical model ispresented by analyzing the internal fluid dynamic phenomenon with respect to the coupling shockabsorber and implemented in MATLAB software package. Using the model it is possible to evaluate theimportance of different factors for design of the shock absorber. In the meantime, the key-modelmachine is designed for coupling dynamic test. Comparisons with experimental results confirm thevalidity of the model. So the cad/CAE software has been developed in MATLAB for design andexperimental test of the new coupling shock absorber.

关键词： Fluid coupling shock absorber Working characteristics Model Simulation

Research on Approaches of Multidisciplinary Design Optimization for Non-hierarchic Systems

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Computer Aided Drafting,Design and Manufacturing 2000年第1期10卷 84-94页

作者： Chen Baihong zhong yifang Liu Jihong Xiao Renbin Zhou Ji (cad center of huazhong university of science & technology, wuhan 430074, PR.china)

In complex engineering optimization, multilevel or two-level approaches are often applied. These approaches are carried out in assumption that there are no connections among sub problems at the same level. But it is difficult to construct the models that suit to this assumption. In recent years, the complexity of engineering systems has led to the rapid development in the field of Multidisciplinary Design Optimization (MDO). In MDO, two kinds of coupled factors, coupled variables (or functions) and system (or global) variables, always exist among all disciplines. These variable5 or functions make it disordered to solve the whole system. So, how to handle these variables is one of important studies in MDO. In this paper two approaches are discussed for handling these coupled factors in non-hierarchic system in MDO. And a test engineering example gives a demonstration about the implemeniation of these approaches.

关键词： coupled factors two-level technique collaborative optimization MDO

A Mechanism for Dynamic and Consistent Product Information Association

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Computer Aided Drafting,Design and Manufacturing 2000年第1期10卷 50-56页

作者： Zhang Tianbing Wu Junjun zhong yifang Zhou Ji (cad center huazhong university of science and technology, Wu Han 430074)

The dynamic and consistent information association among vtrious application activities in the full life cycle of a product is a key to the assurance of the cooperation among different application domains. In order to establish and maintain the association, a design-process-based product association model was proposed. This model takes advantage of the generic naming mechanism, the private protocol for history-based form feature modeling, on which the Data Association Protocol is built. Hence the model can provide the way of constructing and maintaining the information linkage among different product developing stages naturally and dynamically while keeping the privacy of the feature coding. A case study illustrates the utilities of the model in the data linking between design model and process planning model.

关键词： product data association feature coding design process cad

An Automatic Generation System of Reinforcement Detail Drawings for Hydraulic Structures

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Computer Aided Drafting,Design and Manufacturing 2000年第1期10卷 41-49页

作者： Qian Yusen Chen Liping zhong yifang Zhou Ji (National cad Sopport Software Engineering Research center (wuhan) huazhong university of science and technology, wuhan P. r. china, 430074) Niu Xinqiang Yang Xinjun Yang Benxin (Changjiang Water Resource C

Reinforcement detail drawings are one important part of the design of hydraulic structures and the important basis of construction and management. However, the efficiency of the traditional creation of engineering drawings is very low and the workload is heavy. There is no satisfactory software for hydraulic engineering because of the irregularity and diversity of hydraulic structures' shape. An automatic generation system of reinforcement detail drawings for hydraulic structures is introduced. Its functions and modules are introduced first. The related technologies such as automatic driensioning are discussed in detail. At the end of the paper, an example is given.

关键词： reinforcement detail drawings automatic dimensioning collision checking engineering drawings

基于层次结构的特征及其在cad/CAM中的应用

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计算机工程 1997年第6期23卷 68-70页

作者：郭群万立钟毅芳周济华中理工大学cad中心武汉430074

特征的研究近年来得到长足的发展.然而由于特征的发展与人的思维和工程应用的背景相贯通，造成特征定义的不统一，因而限制了特征在cad／CAM中应用，使基于特征的cad／CAM集成难以实现.文中把特征放在cad／CAM集成的全局来考虑，不单单... 详细信息

特征的研究近年来得到长足的发展.然而由于特征的发展与人的思维和工程应用的背景相贯通，造成特征定义的不统一，因而限制了特征在cad／CAM中应用，使基于特征的cad／CAM集成难以实现.文中把特征放在cad／CAM集成的全局来考虑，不单单只是从特征的形状出发，而是同时从设计与加工两个角度出发来描述与定义特征.努力使特征所包含的信息能适应cad／CAM集成的需要.

关键词：层次结构 cad CAM CIMS