Pub Date : 2020-05-25DOI: 10.14733/cadconfp.2020.106-110
J. Lai, Zhongwei Zhang, Pei-Pu Song, Chia-Hsiang Hsu, Yao-Chen Tsai
A DFM analysis and design modification system for plastic injection molding was developed in this study. It mainly included a feature recognition algorithm to extract tube and rib features for analysis, a DFM analysis algorithm for the optimization of feature dimensions, and a design modification algorithm to modify unqualified ribs and tubes automatically. The proposed feature recognition algorithm recognized auxiliary faces, including translation, wall and bottom faces, on the inner surface of a thin-wall part, and then grouped each set of protrusion faces. Tubes and ribs were then recognized with separate recognition algorithms. The proposed DFM analysis algorithm provided a data structure of fillet, rib and tube features for the evaluation of rib and tube dimensions. The optimization of feature dimensions included thickness, height, draft angle, base radius, and space for both ribs and tubes in accordance with various design guides. Finally, the design modification algorithm could modify all unqualified ribs and tubes automatically. This enables the CAE engineer to perform a trial-and-error analysis and the modification of the CAD design during the CAE analysis stage.
{"title":"Design Analysis and Modification of Ribs and Tubes on Thin-Wall Parts for Mold Flow Analysis","authors":"J. Lai, Zhongwei Zhang, Pei-Pu Song, Chia-Hsiang Hsu, Yao-Chen Tsai","doi":"10.14733/cadconfp.2020.106-110","DOIUrl":"https://doi.org/10.14733/cadconfp.2020.106-110","url":null,"abstract":"A DFM analysis and design modification system for plastic injection molding was developed in this study. It mainly included a feature recognition algorithm to extract tube and rib features for analysis, a DFM analysis algorithm for the optimization of feature dimensions, and a design modification algorithm to modify unqualified ribs and tubes automatically. The proposed feature recognition algorithm recognized auxiliary faces, including translation, wall and bottom faces, on the inner surface of a thin-wall part, and then grouped each set of protrusion faces. Tubes and ribs were then recognized with separate recognition algorithms. The proposed DFM analysis algorithm provided a data structure of fillet, rib and tube features for the evaluation of rib and tube dimensions. The optimization of feature dimensions included thickness, height, draft angle, base radius, and space for both ribs and tubes in accordance with various design guides. Finally, the design modification algorithm could modify all unqualified ribs and tubes automatically. This enables the CAE engineer to perform a trial-and-error analysis and the modification of the CAD design during the CAE analysis stage.","PeriodicalId":9378,"journal":{"name":"CAD'20","volume":"111 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76310730","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-05-22DOI: 10.14733/cadaps.2021.156-169
P. Salvi, T. Várady, A. Rockwood
Abstract. We investigate genuine multi-sided surface representations that can be converted into standard tensor product format, such as NURBS. Multi-sided patches offer versatility in shape design, and permit smooth, watertight connections between adjacent patches using prescribed cross-derivatives; however, they can seldom be utilized by the majority of CAD/CAM systems, which handle surfaces only in standard data formats. Tensor product surfaces, on the other hand, may be too rigid for shape design, and trimmed patches can only be smoothly connected up to user-defined tolerances. This motivates the search for schemes that benefit from both representations. We analyze four multi-sided surface representations that allow precise conversion into tensor product format, namely S-patches, Warren’s patch, Kato’s patch and a variant of the Charrot–Gregory patch. We compare these schemes from various aspects; in particular, we deal with surface equations, singularities, degrees of the converted surfaces, the control structure built and the computational efficiency of the conversion. Several examples help to gain deeper insights into the problem.
{"title":"Notes on the CAD-Compatible Conversion of Multi-Sided Surfaces","authors":"P. Salvi, T. Várady, A. Rockwood","doi":"10.14733/cadaps.2021.156-169","DOIUrl":"https://doi.org/10.14733/cadaps.2021.156-169","url":null,"abstract":"Abstract. We investigate genuine multi-sided surface representations that can be converted into standard tensor product format, such as NURBS. Multi-sided patches offer versatility in shape design, and permit smooth, watertight connections between adjacent patches using prescribed cross-derivatives; however, they can seldom be utilized by the majority of CAD/CAM systems, which handle surfaces only in standard data formats. Tensor product surfaces, on the other hand, may be too rigid for shape design, and trimmed patches can only be smoothly connected up to user-defined tolerances. This motivates the search for schemes that benefit from both representations. We analyze four multi-sided surface representations that allow precise conversion into tensor product format, namely S-patches, Warren’s patch, Kato’s patch and a variant of the Charrot–Gregory patch. We compare these schemes from various aspects; in particular, we deal with surface equations, singularities, degrees of the converted surfaces, the control structure built and the computational efficiency of the conversion. Several examples help to gain deeper insights into the problem.","PeriodicalId":9378,"journal":{"name":"CAD'20","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86679564","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-05-22DOI: 10.14733/cadconfp.2020.121-125
Chiung-Hui Chen
An important research field of artificial intelligence at present is the intelligent agent. The emergence of the software agent provides students in the field of design with conceptual skills, such as parametric design and derivative design, which makes the exploration of complicated shapes possible through computing. Therefore, in the field of visual design, it is very important for students to learn the application of parameters and train their thinking in parametric design. In this study, through the discussion of the characteristics of folding, the visualization simulation system of folding parameters was introduced into the course of three-dimensional constitution design to improve the ability of students in the field of visual design to transform 2D patterns into 3D folding patterns.
{"title":"Folding Agent: Parameter Visualization in 2D-to-3D Pattern Transformation","authors":"Chiung-Hui Chen","doi":"10.14733/cadconfp.2020.121-125","DOIUrl":"https://doi.org/10.14733/cadconfp.2020.121-125","url":null,"abstract":"An important research field of artificial intelligence at present is the intelligent agent. The emergence of the software agent provides students in the field of design with conceptual skills, such as parametric design and derivative design, which makes the exploration of complicated shapes possible through computing. Therefore, in the field of visual design, it is very important for students to learn the application of parameters and train their thinking in parametric design. In this study, through the discussion of the characteristics of folding, the visualization simulation system of folding parameters was introduced into the course of three-dimensional constitution design to improve the ability of students in the field of visual design to transform 2D patterns into 3D folding patterns.","PeriodicalId":9378,"journal":{"name":"CAD'20","volume":"1 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"91130314","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-05-22DOI: 10.14733/cadaps.2021.170-185
Xiaolian Qin, Zhi Tang, Shuming Gao
Feature-based modeling and direct modeling are the two mainstream CAD modeling methods complementary to each other. Although major engineering CAD vendors has begun to push out direct modeling module in their products, integration between the two modeling methods is still an open issue. The key technical issue to be resolved is: how to determine the updated feature model after direct modeling operations are conducted? This paper proposes an approach to resolving this issue, consisting of determination of feature volume variations, generation of candidate update operations and determination of optimal update operation. The experimental results show the effectiveness of the proposed approach.
{"title":"Automatic Update of Feature Model after Direct Modeling Operation","authors":"Xiaolian Qin, Zhi Tang, Shuming Gao","doi":"10.14733/cadaps.2021.170-185","DOIUrl":"https://doi.org/10.14733/cadaps.2021.170-185","url":null,"abstract":"Feature-based modeling and direct modeling are the two mainstream CAD modeling methods complementary to each other. Although major engineering CAD vendors has begun to push out direct modeling module in their products, integration between the two modeling methods is still an open issue. The key technical issue to be resolved is: how to determine the updated feature model after direct modeling operations are conducted? This paper proposes an approach to resolving this issue, consisting of determination of feature volume variations, generation of candidate update operations and determination of optimal update operation. The experimental results show the effectiveness of the proposed approach.","PeriodicalId":9378,"journal":{"name":"CAD'20","volume":"27 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"83554896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-05-22DOI: 10.14733/cadaps.2021.130-143
Zhinghang Bai, Muzi Chang, Qingjin Peng, Bo Xu
{"title":"Cognitive Reliability and Error Analysis based on Anticipatory Failure Determination","authors":"Zhinghang Bai, Muzi Chang, Qingjin Peng, Bo Xu","doi":"10.14733/cadaps.2021.130-143","DOIUrl":"https://doi.org/10.14733/cadaps.2021.130-143","url":null,"abstract":"","PeriodicalId":9378,"journal":{"name":"CAD'20","volume":"28 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"84042668","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-05-22DOI: 10.14733/cadconfp.2020.6-10
F. Buonamici, M. Carfagni, R. Furferi, Y. Volpe, L. Governi
{"title":"“Generative Design”: An Explorative Study","authors":"F. Buonamici, M. Carfagni, R. Furferi, Y. Volpe, L. Governi","doi":"10.14733/cadconfp.2020.6-10","DOIUrl":"https://doi.org/10.14733/cadconfp.2020.6-10","url":null,"abstract":"","PeriodicalId":9378,"journal":{"name":"CAD'20","volume":"21 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77306092","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-05-22DOI: 10.14733/cadaps.2021.199-210
Yafan Dong, Q. Peng, R. Tan, Junlei Zhang, Peng Zhang, Wei Liu
Abstract. Redesign is required for the product improvement. The function design is one of the most important tasks in a redesign process. In order to generate an optimal solution of the product redesign efficiently for enterprises, this paper proposes a function redesign method based on the extension theory. For a target product to be redesigned, a hierarchal function model of the target product is first formed using the function analysis. Degree of the function importance is then determined by applying the triangular fuzzy number. Difficult function units and high important degree functions are decided according to redesign requirements and ranking of function importance degrees. In order to apply the difficult function units and high importance degree functions in the innovative design, a function redesign process model is developed based on the extension theory and TRIZ tools. Feasibility of the proposed method is verified in redesign of an ultrasonic-based measurement device of the paper thickness.
{"title":"Product Function Redesign based on Extension Theory","authors":"Yafan Dong, Q. Peng, R. Tan, Junlei Zhang, Peng Zhang, Wei Liu","doi":"10.14733/cadaps.2021.199-210","DOIUrl":"https://doi.org/10.14733/cadaps.2021.199-210","url":null,"abstract":"Abstract. Redesign is required for the product improvement. The function design is one of the most important tasks in a redesign process. In order to generate an optimal solution of the product redesign efficiently for enterprises, this paper proposes a function redesign method based on the extension theory. For a target product to be redesigned, a hierarchal function model of the target product is first formed using the function analysis. Degree of the function importance is then determined by applying the triangular fuzzy number. Difficult function units and high important degree functions are decided according to redesign requirements and ranking of function importance degrees. In order to apply the difficult function units and high importance degree functions in the innovative design, a function redesign process model is developed based on the extension theory and TRIZ tools. Feasibility of the proposed method is verified in redesign of an ultrasonic-based measurement device of the paper thickness.","PeriodicalId":9378,"journal":{"name":"CAD'20","volume":"15 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81834926","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2020-05-22DOI: 10.14733/cadaps.2021.97-116
Chuan He, Fan Shi, Q. Peng, R. Tan
Intellectual properties are important resources for enterprises to improve competitiveness of their products in the market. Technology effect matrix is a patent map to effectively display the technical information of patents, which provides an effective tool for enterprises to analyze and identify technology opportunities to plan their patent strategy and direction of development. However, the existing matrix analysis method has problems of the information coupling, lack of innovation inspiration for designers, and lack of micro chromatography analysis. This paper combines the technology effect matrix and identification of technology readiness level to build a three-dimensional technology effect model for a comprehensive analysis of patent information. It helps enterprises to effectively formulate scientific technology research and development strategies. Through a cross technology domain patent search, designers can be inspired to develop innovative design with high novelty. The proposed method is applied in the improvement of a powder drying device to demonstrate the effectiveness of the method.
{"title":"Identification of Technology Opportunity Based on a Three-Dimensional Technology Effect Model","authors":"Chuan He, Fan Shi, Q. Peng, R. Tan","doi":"10.14733/cadaps.2021.97-116","DOIUrl":"https://doi.org/10.14733/cadaps.2021.97-116","url":null,"abstract":"Intellectual properties are important resources for enterprises to improve competitiveness of their products in the market. Technology effect matrix is a patent map to effectively display the technical information of patents, which provides an effective tool for enterprises to analyze and identify technology opportunities to plan their patent strategy and direction of development. However, the existing matrix analysis method has problems of the information coupling, lack of innovation inspiration for designers, and lack of micro chromatography analysis. This paper combines the technology effect matrix and identification of technology readiness level to build a three-dimensional technology effect model for a comprehensive analysis of patent information. It helps enterprises to effectively formulate scientific technology research and development strategies. Through a cross technology domain patent search, designers can be inspired to develop innovative design with high novelty. The proposed method is applied in the improvement of a powder drying device to demonstrate the effectiveness of the method.","PeriodicalId":9378,"journal":{"name":"CAD'20","volume":"159 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2020-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"82108064","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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