At present,BIM platforms rely on foreign software.Homemade software and industry applications are mostly secondary developments,which present stranglehold problems caused by interruptions to the software supply.To sol...At present,BIM platforms rely on foreign software.Homemade software and industry applications are mostly secondary developments,which present stranglehold problems caused by interruptions to the software supply.To solve the problem,key technical research on the 3D integrated design of railway engineering was stuedied based on homemade graphics engines to propose an innovative railway BIM platform framework.The entire process was completed from the top-level design to the engineering verification of the platform.The co-designed mechanism of a"center model and link"hybrid mode was constructed,which solved the difficulties of data management and increment synchronization at a large scale,achieving teamwork among surveying and mapping,alignments,and bridges.The results of this study could provide strong support for the development of BIM software for a whole railway and all majors.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 with...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
Hybrid models derived from rotational solids like cylinders,cones and spheres were implemented on CATIA software.Firstly,make the isosceles triangular prism,cuboid,cylinder,cone,sphere,and the prism with tangent conic...Hybrid models derived from rotational solids like cylinders,cones and spheres were implemented on CATIA software.Firstly,make the isosceles triangular prism,cuboid,cylinder,cone,sphere,and the prism with tangent conic and curved triangle ends,the cuboid with tangent cylindrical and curved rectangle ends,the cylinder with tangent spherical and curved circular ends as the basic Boolean deference units to the primary cylinders,cones and spheres on symmetrical and some critical geometric conditions,forming a series of variant solid models.Secondly,make the deference units above as the basic union units to the main cylinders,cones,and spheres accordingly,forming another set of solid models.Thirdly,make the tangent ends of union units into oblique conic,cylindrical,or with revolved triangular pyramid,quarterly cylinder and annulus ends on sketch based features to the main cylinders,cones,and spheres repeatedly,thus forming still another set of solid models.It is expected that these derivative models be beneficial both in the structure design,hybrid modeling,and finite element analysis of engineering components and in comprehensive training of spatial configuration of engineering graphics.展开更多
基金supported in part by CHN RAILWAY(Grant Number L2021G012)in part by CHN NSFC under(Grant U2268203).
文摘At present,BIM platforms rely on foreign software.Homemade software and industry applications are mostly secondary developments,which present stranglehold problems caused by interruptions to the software supply.To solve the problem,key technical research on the 3D integrated design of railway engineering was stuedied based on homemade graphics engines to propose an innovative railway BIM platform framework.The entire process was completed from the top-level design to the engineering verification of the platform.The co-designed mechanism of a"center model and link"hybrid mode was constructed,which solved the difficulties of data management and increment synchronization at a large scale,achieving teamwork among surveying and mapping,alignments,and bridges.The results of this study could provide strong support for the development of BIM software for a whole railway and all majors.
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.
文摘Hybrid models derived from rotational solids like cylinders,cones and spheres were implemented on CATIA software.Firstly,make the isosceles triangular prism,cuboid,cylinder,cone,sphere,and the prism with tangent conic and curved triangle ends,the cuboid with tangent cylindrical and curved rectangle ends,the cylinder with tangent spherical and curved circular ends as the basic Boolean deference units to the primary cylinders,cones and spheres on symmetrical and some critical geometric conditions,forming a series of variant solid models.Secondly,make the deference units above as the basic union units to the main cylinders,cones,and spheres accordingly,forming another set of solid models.Thirdly,make the tangent ends of union units into oblique conic,cylindrical,or with revolved triangular pyramid,quarterly cylinder and annulus ends on sketch based features to the main cylinders,cones,and spheres repeatedly,thus forming still another set of solid models.It is expected that these derivative models be beneficial both in the structure design,hybrid modeling,and finite element analysis of engineering components and in comprehensive training of spatial configuration of engineering graphics.
