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Process Auxiliary Decision-making Based on Rough Sets and Regulation Distance Computing

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Chinese Journal of Mechanical Engineering 2009年第4期22卷 528-534页

作者： FANG Hui TAN Jianrong yin guofu LI Zhongkai State Key Laboratory of CAD and CG Zhejiang University Hangzhou 310027 China School of Manufacturing Science and Technology Sichuan University Chengdu 610065 China

Computer aided process planning（CAPP） is an important content of computer integrated manufacturing, and intelligentizing is the orientation of development of CAPP. Process planning has characters of empirical and time-consuming to finalize, and the same technical aim always can be achieved by different process schemes, so intelligentizing of process decision making always be a difficult point of CAPP and computer integrated manufacturing （CIM）. For the purpose of intelligent aided process decision making and reuse of process resource, this paper proposed a decision making method based on rough sets（RS） and regular distance computing. The main contents and methods of process planning decision making are analyzed under agile response manufacturing environment, the concept of process knowledge granule is represented, and the methods of process knowledge granule partitioning and granularity analysis are put forward. Based on the theory of RS and combined the method of process attributes importance identification, the paper brought forward a computing model for process scheme regulation distance under the same attribute conditions, and conflict resolution strategy was introduced to acquire process scheme fit for actual situation of enterprise＇s manufacturing resources, so as to realize process resources＇ conflict resolution and quick excavate and reuse of enterprises＇ existing process knowledge, to advance measures of process decision making and improve the rationality and capability of agile response of process planning.

关键词： process planning decision-making rough sets knowledge granule granularity regulation distance

Edge detection of magnetic tile cracks,based on wavelet

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High Technology Letters 2015年第3期21卷 276-281页

作者：林丽君 He Mingge yin ying yin Xiangyun yin guofu School of Manufacturing Science and Engineering Sichuan University Gas Production Engineering Research Institute Petro China Southwest Oil & Gas Field Co.

In order to extract the defect edge information on the magnetic tile surface with low contrast and textured background,an edge detection algorithm based on image weighted information entropy and wavelet modulus maxima is *** first,a new Butterworth high pass filter(BHPF) with adaptive cutoff frequency is produced,because the clarity and complexity of the textured background are described by the weighted information entropy of the image gradient variance quantitatively,and the filter can change its parameters through matching the non-linear relationship between the information entropy and the cutoff *** then,the best decomposition scale is obtained by the level determination function to prevent edge information from *** last,edge points are got by double threshold after obtaining the wavelet modulus maxima,and then the edge image is linked by the edge points to ensure the edge continuity and *** results indicate that the proposed algorithm outperforms the conventional Canny and Sobel algorithm,and the edge detection algorithm can also detect other defects,and lays the foundation for defecting auto- recognition.

关键词： edge detection wavelet transform textures processing magnetic tile informationentropy

APPLICATION OF INTEGER CODING ACCELERATING GENETIC ALGORITHM IN RECTANGULAR CUTTING STOCK PROBLEM

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Chinese Journal of Mechanical Engineering 2006年第3期19卷 335-339页

作者： FANG Hui yin guofu LI Haiqing PENG Biyou School of Manufacturing Science and Technology Sichuan University Chengdu 610065 China

An improved genetic algorithm and its application to resolve cutting stock problem arc presented. It is common to apply simple genetic algorithm （SGA） to cutting stock problem, but the huge amount of computing of SGA is a serious problem in practical application. Accelerating genetic algorithm （AGA） based on integer coding and AGA＇s detailed steps are developed to reduce the amount of computation, and a new kind of rectangular parts blank layout algorithm is designed for rectangular cutting stock problem. SGA is adopted to produce individuals within given evolution process, and the variation interval of these individuals is taken as initial domain of the next optimization process, thus shrinks searching range intensively and accelerates the evaluation process of SGA. To enhance the diversity of population and to avoid the algorithm stagnates at local optimization result, fixed number of individuals are produced randomly and replace the same number of parents in every evaluation process. According to the computational experiment, it is observed that this improved GA converges much sooner than SGA, and is able to get the balance of good result and high efficiency in the process of optimization for rectangular cutting stock problem.

关键词： Accelerating genetic algorithm Efficiency of optimization Cutting stock problem

MODELING METHOD OF 4D INFORMATION MODEL FOR COOPERATIVE DESIGN OF MECHANICAL PRODUCTS

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Chinese Journal of Mechanical Engineering 2007年第5期20卷 106-109页

作者： TAN ying yin guofu HU Ruifei FANG Hui College of Manufacturing Science and Engineering Sichuan University Chengdu 610065 China College of Computer Science and Technology Southwest University for Nationalities Chengdu 610041 China

The continuous developing features in the design of mechanical product and based on 3D entity model is aimed at, and the extension of the 4-dimensional model with the process of designing, the knowledge described model on the level of semantic understanding and summarizing the designing process and the way of discovering knowledge from multi-information model are studied. On the basis of designing the broad sensed collaborative system, through discussion of the relationship between the implicit knowledge of the users and the designing knowledge as well as commanding all the designing links, taking advantage of the way of concluding and deducting in the concept of the designers, the synthetic knowledge unit formed in the dynamic process from the conception design t9 the last design is schemed out, and the knowledge discovered principle in the dynamic designing process of the mechanical products and the key technology in its implementation under the milieu of network is brought forward.

关键词： Four-dimensional(4D)- Product design Conceptual design Cooperative design Data mining

COOPERATIVE CLUSTERING BASED ON GRID AND DENSITY

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Chinese Journal of Mechanical Engineering 2006年第4期19卷 544-547页

作者： HU Ruifei yin guofu TAN ying CAI Peng School of Manufacturing Science and Engineering Sichuan University Chengdu 610065 China

Based on the analysis of features of the grid-based clustering method-clustering in quest （CLIQUE） and density-based clustering method-density-based spatial clustering of applications with noise （DBSCAN）, a new clustering algorithm named cooperative clustering based on grid and density （CLGRID） is presented. The new algorithm adopts an equivalent rule of regional inquiry and density unit identification. The central region of one class is calculated by the grid-based method and the margin region by a density-based method. By clustering in two phases and using only a small number of seed objects in representative units to expand the cluster, the frequency of region query can be decreased, and consequently the cost of time is reduced. The new algorithm retains positive features of both grid-based and density-based methods and avoids the difficulty of parameter searching. It can discover clusters of arbitrary shape with high efficiency and is not sensitive to noise. The application of CLGRID on test data sets demonstrates its validity and higher efficiency, which contrast with tradi- tional DBSCAN with R tree.

关键词： Data mining Clustering Seed object

Preliminary discussion on the ignition mechanism of exploding foil initiators igniting boron potassium nitrate

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Defence Technology（防务技术） 2024年第2期32卷 222-231页

作者： Haotian Jian Guoqiang Zheng Lejian Chen Zheng Ning guofu yin Peng Zhu Ruiqi Shen School of Chemistry and Chemical Engineering Nanjing University of Science and TechnologyNanjing 210094China Micro-Nano Energetic Devices Key Laboratory of MIIT Nanjing University of Science and TechnologyNanjing 210094China Anhui Province Key Laboratory of Microsystem the 43rd Research Institute of CETCHefei 230088China Science and Technology on Applied Physical and Chemistry Laboratory Shanxi Applied Physics and Chemistry Research Institute Xi'an 710061China

Exploding foil initiator(EFI)is a kind of advanced device for initiating explosives,but its function is unstable when it comes to directly igniting *** solve the problem,this research aims to reveal the ignition mechanism of EFIs directly igniting *** oscilloscope,a photon Doppler velocimetry,and a plasma spectrum measurement system were employed to obtain information of electric characteristics,impact pressure,and plasma *** results of the electric characteristics and the impact pressure were inconsistent with ignition *** only thing that the ignition success tests had in common was that their plasma all had a relatively long period of high-temperature duration(HTD).It eventually concludes that the ignition mechanism in this research is the microconvection heat transfer rather than the shock initiation,which differs from that of exploding foil initiators detonating ***,the methods for evaluating the ignition success of semiconductor bridge initiators are not entirely applicable to the tests mentioned in this *** HTD is the critical parameter for judging the ignition success,and it is influenced by two factors:the late time discharge and the energy of the electric *** longer time of the late time discharge and the more energy of the electric explosion,the easier it is to expand the HTD,which improves the probability of the ignition success.

关键词： Exploding foil initiator PDV Plasma spectrum Ignition mechanism Boron potassium nitrate

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异地企业远程有限元分析服务系统研究

高技术通讯 2008年第2期18卷 167-172页

作者：张莉殷国富四川大学制造科学与工程学院成都610065

针对中小型企业利用网络环境下的有限元分析技术有效进行产品开发的需求,提出了基于 Web 的远程有限元分析服务平台的体系结构,并设计了其工作流程。该服务平台系统主要采用了基于层次分析法和模糊综合评价法的计算机辅助工程(CAE)服务... 详细信息

针对中小型企业利用网络环境下的有限元分析技术有效进行产品开发的需求,提出了基于 Web 的远程有限元分析服务平台的体系结构,并设计了其工作流程。该服务平台系统主要采用了基于层次分析法和模糊综合评价法的计算机辅助工程(CAE)服务能力评价机制、协同分析的数据交换技术、基于角色-任务的系统访问控制策略和任务规划与监控机制等关键技术,实现了有限元应用资源的集成。该系统为某型号精密卧式加工中心提供了远程有限元分析服务,服务结果表明,该系统实现了网络环境下有限元分析技术的有效利用,验证了系统的可用性。

关键词：远程分析有限元服务能力评价数据交换

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基于知识驱动的产品快速设计技术研究

汽车工程 2010年第6期32卷 547-552页

作者：张莉殷国富台州学院机械工程学院台州318000 四川大学制造科学与工程学院成都610065

以知识驱动的思想为基础,提出了一种产品快速设计系统的体系结构,研究了基于规则的向导式设计和基于实例的变型设计的支撑技术和实现方法。最后开发了基于知识驱动的汽车后桥快速设计系统。

关键词：知识驱动汽车后桥向导式设计变型设计

Image Classification for Steel Strip Surface Defects Based on Support Vector Machines

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Image Classification for Steel Strip Surface Defects Based o...