The general computer-aided design （CAD） software cannot meet the mould design requirement of the autoclave process for composites, because many parameters such as temperature and pressure should be considered in the...The general computer-aided design （CAD） software cannot meet the mould design requirement of the autoclave process for composites, because many parameters such as temperature and pressure should be considered in the mould design process, in addition to the material and geometry of the part. A framed-mould computer-aided design system （FMCAD） used in the autoclave moulding process is proposed in this paper. A function model of the software is presented, in which influence factors such as part structure, mould structure, and process parameters are considered; a design model of the software is established using object oriented （O-O） technology to integrate the stiffness calculation, temperature field calculation, and deformation field calculation of mould in the design, and in the design model, a hybrid model of mould based on calculation feature and form feature is presented to support those calculations. A prototype system is developed, in which a mould design process wizard is built to integrate the input information, calculation, analysis, data storage, display, and design results of mould design. Finally, three design examples are used to verify the prototype.展开更多
This paper attempts to set a unified scene for various linear time-invariant (LTI) control system design schemes, by transforming the existing concept of “computer-aided control system design” (CACSD) to novel “com...This paper attempts to set a unified scene for various linear time-invariant (LTI) control system design schemes, by transforming the existing concept of “computer-aided control system design” (CACSD) to novel “computer-automated control system design” (CAutoCSD). The first step towards this goal is to accommodate, under practical constraints, various design objectives that are desirable in both time and frequency domains. Such performance-prioritised unification is aimed at relieving practising engineers from having to select a particular control scheme and from sacrificing certain performance goals resulting from pre-commitment to such schemes. With recent progress in evolutionary computing based extra-numeric, multi-criterion search and optimisation techniques, such unification of LTI control schemes becomes feasible, analytical and practical, and the resultant designs can be creative. The techniques developed are applied to, and illustrated by, three design problems. The unified approach automatically provides an integrator for zero-steady state error in velocity control of a DC motor, and meets multiple objectives in the design of an LTI controller for a non-minimum phase plant and offers a high-performance LTI controller network for a non-linear chemical process.展开更多
This paper discusses a pattern design system in textile industry,the establishment of an imagedatabase which is used to store various kinds of source materials for designers’ reference in order tospeed up design proc...This paper discusses a pattern design system in textile industry,the establishment of an imagedatabase which is used to store various kinds of source materials for designers’ reference in order tospeed up design process.Pattern design image database (PDIDB) runs on the double-machine hardware system com-posed of ALTOS-986 and IBM PC/XT microcomputer.The former (host) manages imagedatabase,and the latter works both as a terminal to operate PDIDB and as an image processingstation to input,output,edit and display image data.PDIDB has two mainparts,the image storage management system and the image attributemanagement system and provides some functions,such as retrieval,deleting and updating.展开更多
目的:探索一种构建通用三维彩色数字牙列模型的方法,获得可在常见三维软件中显示和编辑处理的三维彩色数字牙列模型,提高牙列模型在通用三维软件中的仿真效果。方法:使用口内扫描仪扫描牙列获得数字化三维牙列模型,并以STL格式导出,同...目的:探索一种构建通用三维彩色数字牙列模型的方法,获得可在常见三维软件中显示和编辑处理的三维彩色数字牙列模型,提高牙列模型在通用三维软件中的仿真效果。方法:使用口内扫描仪扫描牙列获得数字化三维牙列模型,并以STL格式导出,同时用单镜头反光数码相机按照美国牙科美容协会病例摄影要求拍摄口内照片,选择其中5张照片。在Geomagic Studio 2013软件中导入三维牙列数据,并将5张口内照片分别投影至数字化三维牙列模型表面,精细调整不同照片的交界区域使其过渡自然,获得带有颜色信息的三维牙列模型,以OBJ格式或WRP格式(Geomagic软件专用格式)保存和导出。以患者评价为标准对三维数字模型的颜色仿真效果进行评价。结果:基于口内扫描和口内数码照片,构建了可在常见三维软件中显示和编辑的通用三维彩色数字牙列模型,获得较好的牙列颜色仿真效果。在临床上,将此三维彩色牙列模型与面部三维扫描图像配准和复合后用于前牙美学修复的数字化术前设计和修复效果虚拟预测中,提高了医患交流的效率及患者对修复效果的认知程度。结论:结合口内扫描和口内数码摄影可构建出颜色仿真效果良好的通用三维彩色数字牙列模型,在临床应用中可提高三维数字牙列模型的仿真效果,加强医患沟通效率和效果。展开更多
文摘The general computer-aided design （CAD） software cannot meet the mould design requirement of the autoclave process for composites, because many parameters such as temperature and pressure should be considered in the mould design process, in addition to the material and geometry of the part. A framed-mould computer-aided design system （FMCAD） used in the autoclave moulding process is proposed in this paper. A function model of the software is presented, in which influence factors such as part structure, mould structure, and process parameters are considered; a design model of the software is established using object oriented （O-O） technology to integrate the stiffness calculation, temperature field calculation, and deformation field calculation of mould in the design, and in the design model, a hybrid model of mould based on calculation feature and form feature is presented to support those calculations. A prototype system is developed, in which a mould design process wizard is built to integrate the input information, calculation, analysis, data storage, display, and design results of mould design. Finally, three design examples are used to verify the prototype.
文摘This paper attempts to set a unified scene for various linear time-invariant (LTI) control system design schemes, by transforming the existing concept of “computer-aided control system design” (CACSD) to novel “computer-automated control system design” (CAutoCSD). The first step towards this goal is to accommodate, under practical constraints, various design objectives that are desirable in both time and frequency domains. Such performance-prioritised unification is aimed at relieving practising engineers from having to select a particular control scheme and from sacrificing certain performance goals resulting from pre-commitment to such schemes. With recent progress in evolutionary computing based extra-numeric, multi-criterion search and optimisation techniques, such unification of LTI control schemes becomes feasible, analytical and practical, and the resultant designs can be creative. The techniques developed are applied to, and illustrated by, three design problems. The unified approach automatically provides an integrator for zero-steady state error in velocity control of a DC motor, and meets multiple objectives in the design of an LTI controller for a non-minimum phase plant and offers a high-performance LTI controller network for a non-linear chemical process.
文摘This paper discusses a pattern design system in textile industry,the establishment of an imagedatabase which is used to store various kinds of source materials for designers’ reference in order tospeed up design process.Pattern design image database (PDIDB) runs on the double-machine hardware system com-posed of ALTOS-986 and IBM PC/XT microcomputer.The former (host) manages imagedatabase,and the latter works both as a terminal to operate PDIDB and as an image processingstation to input,output,edit and display image data.PDIDB has two mainparts,the image storage management system and the image attributemanagement system and provides some functions,such as retrieval,deleting and updating.
文摘目的:探索一种构建通用三维彩色数字牙列模型的方法,获得可在常见三维软件中显示和编辑处理的三维彩色数字牙列模型,提高牙列模型在通用三维软件中的仿真效果。方法:使用口内扫描仪扫描牙列获得数字化三维牙列模型,并以STL格式导出,同时用单镜头反光数码相机按照美国牙科美容协会病例摄影要求拍摄口内照片,选择其中5张照片。在Geomagic Studio 2013软件中导入三维牙列数据,并将5张口内照片分别投影至数字化三维牙列模型表面,精细调整不同照片的交界区域使其过渡自然,获得带有颜色信息的三维牙列模型,以OBJ格式或WRP格式(Geomagic软件专用格式)保存和导出。以患者评价为标准对三维数字模型的颜色仿真效果进行评价。结果:基于口内扫描和口内数码照片,构建了可在常见三维软件中显示和编辑的通用三维彩色数字牙列模型,获得较好的牙列颜色仿真效果。在临床上,将此三维彩色牙列模型与面部三维扫描图像配准和复合后用于前牙美学修复的数字化术前设计和修复效果虚拟预测中,提高了医患交流的效率及患者对修复效果的认知程度。结论:结合口内扫描和口内数码摄影可构建出颜色仿真效果良好的通用三维彩色数字牙列模型,在临床应用中可提高三维数字牙列模型的仿真效果,加强医患沟通效率和效果。
