An automated method based on the curve chain was proposed for dimensioning of engineering drawings for the mechanical products.According to the internal relation between the features of 3D model feature and elements o...An automated method based on the curve chain was proposed for dimensioning of engineering drawings for the mechanical products.According to the internal relation between the features of 3D model feature and elements of 2D drawing,the curve chain was established to reflect the geometric topological structure between the elements.It divides the dimensions into the absolute dimensions within the cure chain and the relative dimensions between the curve chains.The parallel and lengthy relationship between the drawing elements of the constructed X and Y parallel matrix was solved to remove redundant elements in the curve chain and labeled the absolute dimensions of the remaining valid elements.The average minimum weight coefficient was introduced to judge the dependence on the relative dimensions between curve chains.Through the analysis of the overlap between the circular rectangular areas,including all the absolute dimensions of the curve chains,overlapping curve chains were merged,and their dimensions were rearranged to avoid the cross interference between them.The method was seamlessly integrated into the drafting module of product design software NX,and it developed an automated dimensioning system.The examples show that the system has excellent interactivity and robustness in the dimensioning of product engineering drawings.The dimension information is complete,accurate and reliable.展开更多
Recent development and recognition methods of raster to vector conversion for engineering drawings are presented. The advantages and disadvantages of all existing models are analyzed. Some research challenges and futu...Recent development and recognition methods of raster to vector conversion for engineering drawings are presented. The advantages and disadvantages of all existing models are analyzed. Some research challenges and future directions are discussed.展开更多
Based on the necessity of three dimensional modeling with computer in teaching reform, this paper is the summarization of reform practice of teaching engineering drawing in our institute. The teaching reform begins wi...Based on the necessity of three dimensional modeling with computer in teaching reform, this paper is the summarization of reform practice of teaching engineering drawing in our institute. The teaching reform begins with three dimensional modeling that used computer instead of board. On the basis of target of teaching reform, set of teaching content, arrangement of class hour and teaching method, the research of teaching practice have been done, and very good effects in teaching of engineering drawing have been achieved.展开更多
A pioneering self-optimizing teaching method in student-centric seminars was introduced in this paper, in which each student will establish preferred engineering drawing process directed by educators and necessary pri...A pioneering self-optimizing teaching method in student-centric seminars was introduced in this paper, in which each student will establish preferred engineering drawing process directed by educators and necessary principles. We presented the working-memory centered mechanism in mental aspect to explain the phenomena. The theoretical mechanism is based on the typical translation between orthographic projection image and perspective image. The first is bonding object into a whole solid. The second is splicing the selected surfaces of objects and tailored them together. Two study groups were determined： an experimental group, who were directed to combine the object-based and surface-based construction methods in the presentations, and a control group, who learned through regular presentations made by an experienced teacher during the same period. The results showed that a significant enhancement in average scores has been achieved in the test among the experimental group in comparison with the control group. The variance of the scores is obviously reduced through the self-optimizing learning strategy, indicating a significant advantage on filling up the ability gaps among students. In fact, the results also indicated that the educator did keep the lesson in high quality. But it is worthy of more attention that the difference of mental manipulation habits between some students and educator may lead to a polarization in score distribution. So the seminar is a promising method to help the students to combine the object-based and surface-based construction methods.展开更多
Automatic recognition and interpretation of engineering drawing plays an important role in computer aided engineering. Detecting the positional relation between entities is an important topic in this research field. I...Automatic recognition and interpretation of engineering drawing plays an important role in computer aided engineering. Detecting the positional relation between entities is an important topic in this research field. In this paper the concepts of adjacent relativity and container window of drawing entities were proposed. By means of container window, the adjacent irrelative entities can be detected quickly and effectively, which speeds up the process of adjacent relativity detection. Meanwhile, the algorithm of adjacent relativity detection was discussed.展开更多
The course of architectural engineering drawing is the basic course before the students of civil engineering related majors study the professional courses.It aims to cultivate the students’ability of configuration,ex...The course of architectural engineering drawing is the basic course before the students of civil engineering related majors study the professional courses.It aims to cultivate the students’ability of configuration,expression,reading and drawing.BIM Technology simulates the real component information of a building through digital information simulation,and flexibly transforms between two-dimensional and threedimensional,providing a new tool for the teaching of architectural engineering drawing.This paper analyzes the characteristics of BIM Technology and teaching advantages,combined with the current teaching situation of architectural engineering drawing course,puts forward reform suggestions and implementation process,and provides reform ideas for the teaching of engineering basic courses.展开更多
The book ＂Selected Papers on Descriptive Geometry and Construction Drawing＂ was published by the joint efforts of three institutions （the Association for Science and Technology of Hubei Province, Hubei Province Car...The book ＂Selected Papers on Descriptive Geometry and Construction Drawing＂ was published by the joint efforts of three institutions （the Association for Science and Technology of Hubei Province, Hubei Province Cartographic Association, Hubei Science and Technology Information Institute） in 1965. It is the first collection of papers on construction drawing, representing the accomplishments of the research of the field in the 1960s in China. This paper describes its historical background, contents and val- He.展开更多
The paper presents a promised way of feature recognition from 2D engineering drawing——developing special system and extracting features from machining drawings. In general, researchers inclined to extract features f...The paper presents a promised way of feature recognition from 2D engineering drawing——developing special system and extracting features from machining drawings. In general, researchers inclined to extract features from design drawings and ignored machining drawings. Actually, both of machining and design information shows the same importance in developing new products. Not only can machining drawing provide us with feature model or 3D geometrical model of the part, but also they can be easily recognized. In the paper the processes and methods of feature recognition from three-cone-bit (A Kind of aiguilles used to drill oil well) machining drawings are introduced. Firstly, overall approach is explained. Secondly, two methods of form feature recognition are introduced: symbol-matching method used to analyze annularity or chained graph and method based on feature-hint used to recognize the general features. Thirdly, feature parameters are extracted. Finally, a practical implementation is given.展开更多
The way of reform and development of Engineering Drawing education is explored. Such activities have been carried out for 5 years, and great progress in the update of course contents, teaching methods and other relate...The way of reform and development of Engineering Drawing education is explored. Such activities have been carried out for 5 years, and great progress in the update of course contents, teaching methods and other related aspects is achieved. A series of textbooks, multimedia CD and established a Web site for Engineering Drawing course have been published. The efforts to realize an advanced contemporary teaching mode are being made. With the support of multimedia software and resources over Internet, students become the real main body of study, the teaching qualities are supervised and controlled throughout, and the students?imagination and ability of design and drawing are greatly enhanced. All reform is built on digital technology.展开更多
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 dra...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.展开更多
基金This work is supported by the Science and Technology Planning Project of Ronggui(grant number RGJF(2017)27H-8).
文摘An automated method based on the curve chain was proposed for dimensioning of engineering drawings for the mechanical products.According to the internal relation between the features of 3D model feature and elements of 2D drawing,the curve chain was established to reflect the geometric topological structure between the elements.It divides the dimensions into the absolute dimensions within the cure chain and the relative dimensions between the curve chains.The parallel and lengthy relationship between the drawing elements of the constructed X and Y parallel matrix was solved to remove redundant elements in the curve chain and labeled the absolute dimensions of the remaining valid elements.The average minimum weight coefficient was introduced to judge the dependence on the relative dimensions between curve chains.Through the analysis of the overlap between the circular rectangular areas,including all the absolute dimensions of the curve chains,overlapping curve chains were merged,and their dimensions were rearranged to avoid the cross interference between them.The method was seamlessly integrated into the drafting module of product design software NX,and it developed an automated dimensioning system.The examples show that the system has excellent interactivity and robustness in the dimensioning of product engineering drawings.The dimension information is complete,accurate and reliable.
文摘Recent development and recognition methods of raster to vector conversion for engineering drawings are presented. The advantages and disadvantages of all existing models are analyzed. Some research challenges and future directions are discussed.
基金Supported by Beijing City Institution of Higher Learning Talent Education Program Project Foundation (PHR200906213PHR201007234)
文摘Based on the necessity of three dimensional modeling with computer in teaching reform, this paper is the summarization of reform practice of teaching engineering drawing in our institute. The teaching reform begins with three dimensional modeling that used computer instead of board. On the basis of target of teaching reform, set of teaching content, arrangement of class hour and teaching method, the research of teaching practice have been done, and very good effects in teaching of engineering drawing have been achieved.
基金Supported by the Teaching Demonstration Course Construction Project about Engineering Drawing of University of Science and Technology Beijing(KC2014YJX20)the Fundamental Research Funds for the Central Universities(FRF-BR-15-037A)
文摘A pioneering self-optimizing teaching method in student-centric seminars was introduced in this paper, in which each student will establish preferred engineering drawing process directed by educators and necessary principles. We presented the working-memory centered mechanism in mental aspect to explain the phenomena. The theoretical mechanism is based on the typical translation between orthographic projection image and perspective image. The first is bonding object into a whole solid. The second is splicing the selected surfaces of objects and tailored them together. Two study groups were determined： an experimental group, who were directed to combine the object-based and surface-based construction methods in the presentations, and a control group, who learned through regular presentations made by an experienced teacher during the same period. The results showed that a significant enhancement in average scores has been achieved in the test among the experimental group in comparison with the control group. The variance of the scores is obviously reduced through the self-optimizing learning strategy, indicating a significant advantage on filling up the ability gaps among students. In fact, the results also indicated that the educator did keep the lesson in high quality. But it is worthy of more attention that the difference of mental manipulation habits between some students and educator may lead to a polarization in score distribution. So the seminar is a promising method to help the students to combine the object-based and surface-based construction methods.
文摘Automatic recognition and interpretation of engineering drawing plays an important role in computer aided engineering. Detecting the positional relation between entities is an important topic in this research field. In this paper the concepts of adjacent relativity and container window of drawing entities were proposed. By means of container window, the adjacent irrelative entities can be detected quickly and effectively, which speeds up the process of adjacent relativity detection. Meanwhile, the algorithm of adjacent relativity detection was discussed.
基金The general research project of higher education teaching reform of Heilongjiang Provincial Department of education in 2019“construction and application of Engineering Graphics Teaching System Based on OBE concept and BIM Technology”,subject No.sjgy20190540Ministry of education industry university cooperation collaborative education project(new engineering construction)“Research on the application of intelligent construction technology in the training of engineering cost professionals”,Project No.201902102001.
文摘The course of architectural engineering drawing is the basic course before the students of civil engineering related majors study the professional courses.It aims to cultivate the students’ability of configuration,expression,reading and drawing.BIM Technology simulates the real component information of a building through digital information simulation,and flexibly transforms between two-dimensional and threedimensional,providing a new tool for the teaching of architectural engineering drawing.This paper analyzes the characteristics of BIM Technology and teaching advantages,combined with the current teaching situation of architectural engineering drawing course,puts forward reform suggestions and implementation process,and provides reform ideas for the teaching of engineering basic courses.
文摘The book ＂Selected Papers on Descriptive Geometry and Construction Drawing＂ was published by the joint efforts of three institutions （the Association for Science and Technology of Hubei Province, Hubei Province Cartographic Association, Hubei Science and Technology Information Institute） in 1965. It is the first collection of papers on construction drawing, representing the accomplishments of the research of the field in the 1960s in China. This paper describes its historical background, contents and val- He.
文摘The paper presents a promised way of feature recognition from 2D engineering drawing——developing special system and extracting features from machining drawings. In general, researchers inclined to extract features from design drawings and ignored machining drawings. Actually, both of machining and design information shows the same importance in developing new products. Not only can machining drawing provide us with feature model or 3D geometrical model of the part, but also they can be easily recognized. In the paper the processes and methods of feature recognition from three-cone-bit (A Kind of aiguilles used to drill oil well) machining drawings are introduced. Firstly, overall approach is explained. Secondly, two methods of form feature recognition are introduced: symbol-matching method used to analyze annularity or chained graph and method based on feature-hint used to recognize the general features. Thirdly, feature parameters are extracted. Finally, a practical implementation is given.
文摘The way of reform and development of Engineering Drawing education is explored. Such activities have been carried out for 5 years, and great progress in the update of course contents, teaching methods and other related aspects is achieved. A series of textbooks, multimedia CD and established a Web site for Engineering Drawing course have been published. The efforts to realize an advanced contemporary teaching mode are being made. With the support of multimedia software and resources over Internet, students become the real main body of study, the teaching qualities are supervised and controlled throughout, and the students?imagination and ability of design and drawing are greatly enhanced. All reform is built on digital technology.
文摘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.
