Physical model test is an effective way to unveil the dynamic response of a slope under seismic condition.The similarity design is the key of physical model test.An isolated similarity design method for shaking table ...Physical model test is an effective way to unveil the dynamic response of a slope under seismic condition.The similarity design is the key of physical model test.An isolated similarity design method for shaking table tests was proposed and verified in this work.In this method,the relevant physical quantities were divided into several subsystems and subcharacteristic equations for each subsystem were then established based on the Buckingham similarity theory.Large-scale shaking table tests on a reinforced slope were adopted herein to illustrate the application of the proposed isolated similarity design method.The similarity system for the studied slope was divided into four parts in the process of similarity design.The geometrical dimension L,densityρand gravity g were selected as fundamental quantities for the similarity design,and four subcharacteristic equations were established for each subsystem.The dynamic responses of the recorded acceleration and axis force show that the seismic waves propagate well in the model slope.The proposed isolated similarity design method solves the conflict between the similarity requirement for all relevant physical quantities and the difficulty of test model fabrication to satisfy all similarity relations.展开更多
[Objective] The aim was to design and promote similar report system of moderate rain, heavy rain and rainstorm in Guyuan City. [Method] As C#. Net2005 development platform and based on MSSQLSEVER2005 database system, ...[Objective] The aim was to design and promote similar report system of moderate rain, heavy rain and rainstorm in Guyuan City. [Method] As C#. Net2005 development platform and based on MSSQLSEVER2005 database system, the upper air circulation during moderate rain, heavy rain and rainstorm from May to September since 1960, taking 500 hPa, 700 hPa and ground situation as complement, the similar height of 500 and 700 hPa were calculated. [Result]The system is set to be personal and template. The system only needs to be set for once. If the in- stallation is changed, the system doesn＇t need to change parameters. The system would automatically read the parameters and make it easy for the businessman to use. Meanwhile, it solves the problem of storing abundant data. Considering the promotion and application, the system is designed to be universal and portable, [ Conclusion] The system makes uP the Oossibilitv of mis-reoortina the moderate rain. heaw rain and rainstorm.展开更多
Research and application of fractal theory in landscape design has greatly enriched the concepts and techniques of garden creation,and pushed forward landscape design closer to the natural world.By elaborating interna...Research and application of fractal theory in landscape design has greatly enriched the concepts and techniques of garden creation,and pushed forward landscape design closer to the natural world.By elaborating internal connection between fractal theory and landscape design,this paper uses iterative function system of the fractal theory and matlab to draw fractal trees.Two designed experiments demonstrate that the fractal theory can be employed to realize the vivid drawing of natural landscapes with the support of limited data.Therefore,fractal theory is a practical tool used to draw vivid natural landscapes efficiently.展开更多
Aiming at the problem of reverse-design of mechanism, a method based on the matching of trajectory code-chains is presented. The motion trajectory of mechanism is described with code-chain, which is normalized to simp...Aiming at the problem of reverse-design of mechanism, a method based on the matching of trajectory code-chains is presented. The motion trajectory of mechanism is described with code-chain, which is normalized to simplify the operation of geometric transformation. The geometric transforma-tion formulas of scale, mirror and rotation for trajectory code-chain are defined, and the reverse de-sign for mechanism trajectory is realized through the analysis and solution of similarity matching between the desired trajectory and the predefined trajectory. The algorithm program and prototype system of reverse design for mechanism trajectory are developed. Application samples show that the method can break the restriction of trajectory patterns in matching, meet the demand of partial match-ing, and overcome the influence of geometric transformation of trajectory on the reverse design for mechanism.展开更多
Aiming at difficult sorting and retrieving complicated structure assembliesin assembly lib, a method for compartmentalizing assembly design resource by conceptual productstructure model is presented. The similar assem...Aiming at difficult sorting and retrieving complicated structure assembliesin assembly lib, a method for compartmentalizing assembly design resource by conceptual productstructure model is presented. The similar assembly retrieval mechanisms of symbol assembly relationgraph matching and symbol assembly relation graph similarity are discussed. The method is validatedby taking valve rod assemblies as example.展开更多
On the basis of the comprehensive analysis about the automatic generation of the injection mold parting surface, the parting surface design method which introduces knowledge and case-based reasoning （CBR） into the c...On the basis of the comprehensive analysis about the automatic generation of the injection mold parting surface, the parting surface design method which introduces knowledge and case-based reasoning （CBR） into the computer-aided design is described by combining with the actual characteristic in injection mold design, and the design process of case-based reasoning method is also given. A case library including the information of parting surface is built with the index of main shape features, The automatic design of the mold parting surface is realized combined with the forward-reasoning method and the similarity solution procedure. The rule knowledge library is also founded including the knowledge, principles and experiences for parting surface design. An example is used to show the validity of the method, and the quality and the efficiency of the mold design are improved.展开更多
This paper summarizes the research results dealing with washer and nut taxonomy and knowledge base design, making the use of fuzzy methodology. In particular, the theory of fuzzy membership functions, similarity matri...This paper summarizes the research results dealing with washer and nut taxonomy and knowledge base design, making the use of fuzzy methodology. In particular, the theory of fuzzy membership functions, similarity matrices, and the operation of fuzzy inference play important roles.A realistic set of 25 washers and nuts are employed to conduct extensive experiments and simulations.The investigation includes a complete demonstration of engineering design. The results obtained from this feasibility study are very encouraging indeed because they represent the lower bound with respect to performance, namely correctrecognition rate, of what fuzzy methodology can do. This lower bound shows high recognition rate even with noisy input patterns, robustness in terms of noise tolerance, and simplicity in hardware implementation. Possible future works are suggested in the conclusion.展开更多
基金financially supported by National Natural Science Foundation of China(51708163 and 41907247)Hainan Provincial Natural Science Foundation of China(520MS018)the foundation from the State Key Laboratory of Geohazard Prevention and Geoenvironment Protection(SKLGP2021K008)。
文摘Physical model test is an effective way to unveil the dynamic response of a slope under seismic condition.The similarity design is the key of physical model test.An isolated similarity design method for shaking table tests was proposed and verified in this work.In this method,the relevant physical quantities were divided into several subsystems and subcharacteristic equations for each subsystem were then established based on the Buckingham similarity theory.Large-scale shaking table tests on a reinforced slope were adopted herein to illustrate the application of the proposed isolated similarity design method.The similarity system for the studied slope was divided into four parts in the process of similarity design.The geometrical dimension L,densityρand gravity g were selected as fundamental quantities for the similarity design,and four subcharacteristic equations were established for each subsystem.The dynamic responses of the recorded acceleration and axis force show that the seismic waves propagate well in the model slope.The proposed isolated similarity design method solves the conflict between the similarity requirement for all relevant physical quantities and the difficulty of test model fabrication to satisfy all similarity relations.
文摘[Objective] The aim was to design and promote similar report system of moderate rain, heavy rain and rainstorm in Guyuan City. [Method] As C#. Net2005 development platform and based on MSSQLSEVER2005 database system, the upper air circulation during moderate rain, heavy rain and rainstorm from May to September since 1960, taking 500 hPa, 700 hPa and ground situation as complement, the similar height of 500 and 700 hPa were calculated. [Result]The system is set to be personal and template. The system only needs to be set for once. If the in- stallation is changed, the system doesn＇t need to change parameters. The system would automatically read the parameters and make it easy for the businessman to use. Meanwhile, it solves the problem of storing abundant data. Considering the promotion and application, the system is designed to be universal and portable, [ Conclusion] The system makes uP the Oossibilitv of mis-reoortina the moderate rain. heaw rain and rainstorm.
基金Supported by National University Student Innovation Program of Beijing Forestry University~~
文摘Research and application of fractal theory in landscape design has greatly enriched the concepts and techniques of garden creation,and pushed forward landscape design closer to the natural world.By elaborating internal connection between fractal theory and landscape design,this paper uses iterative function system of the fractal theory and matlab to draw fractal trees.Two designed experiments demonstrate that the fractal theory can be employed to realize the vivid drawing of natural landscapes with the support of limited data.Therefore,fractal theory is a practical tool used to draw vivid natural landscapes efficiently.
基金This project is supported by National Hi-tech Research and Development Program of China (863 Program, No. 2006AA04Z114)Research Fund for the Doctoral Program of Higher Education, China (No. 20040335060)Provincial Scientific Personnel Educational Foundation of Zhejiang, China (No. R603240).
文摘Aiming at the problem of reverse-design of mechanism, a method based on the matching of trajectory code-chains is presented. The motion trajectory of mechanism is described with code-chain, which is normalized to simplify the operation of geometric transformation. The geometric transforma-tion formulas of scale, mirror and rotation for trajectory code-chain are defined, and the reverse de-sign for mechanism trajectory is realized through the analysis and solution of similarity matching between the desired trajectory and the predefined trajectory. The algorithm program and prototype system of reverse design for mechanism trajectory are developed. Application samples show that the method can break the restriction of trajectory patterns in matching, meet the demand of partial match-ing, and overcome the influence of geometric transformation of trajectory on the reverse design for mechanism.
基金This project is supported by State High Technology Development Program of China (No.2003AA413310) National Natural Science Foundation of China(No.60375020) 973 Program of China(No. 2004CB719402, No. 2002CB312106).
文摘Aiming at difficult sorting and retrieving complicated structure assembliesin assembly lib, a method for compartmentalizing assembly design resource by conceptual productstructure model is presented. The similar assembly retrieval mechanisms of symbol assembly relationgraph matching and symbol assembly relation graph similarity are discussed. The method is validatedby taking valve rod assemblies as example.
文摘On the basis of the comprehensive analysis about the automatic generation of the injection mold parting surface, the parting surface design method which introduces knowledge and case-based reasoning （CBR） into the computer-aided design is described by combining with the actual characteristic in injection mold design, and the design process of case-based reasoning method is also given. A case library including the information of parting surface is built with the index of main shape features, The automatic design of the mold parting surface is realized combined with the forward-reasoning method and the similarity solution procedure. The rule knowledge library is also founded including the knowledge, principles and experiences for parting surface design. An example is used to show the validity of the method, and the quality and the efficiency of the mold design are improved.
文摘This paper summarizes the research results dealing with washer and nut taxonomy and knowledge base design, making the use of fuzzy methodology. In particular, the theory of fuzzy membership functions, similarity matrices, and the operation of fuzzy inference play important roles.A realistic set of 25 washers and nuts are employed to conduct extensive experiments and simulations.The investigation includes a complete demonstration of engineering design. The results obtained from this feasibility study are very encouraging indeed because they represent the lower bound with respect to performance, namely correctrecognition rate, of what fuzzy methodology can do. This lower bound shows high recognition rate even with noisy input patterns, robustness in terms of noise tolerance, and simplicity in hardware implementation. Possible future works are suggested in the conclusion.
