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sculpture surface     
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  复杂曲面
     A Global Optimization Algorithm of Localization for Huge Sculpture Surface Blank
     大型复杂曲面类毛坯加工定位的全局优化算法
短句来源
     Third order Contact Theory for Machining Sculpture Surface
     加工复杂曲面的三阶切触原理
短句来源
     Research on Precision Evaluation for Finished Workpieces with Large Sculpture Surface
     大型复杂曲面零件加工精度评定问题研究
短句来源
     In order to improve the blank positioning, a global optimization algorithm of localization for huge sculpture surface blank is presented.
     针对以上情况,提出了大型复杂曲面类毛坯加工定位的全局优化算法。
短句来源
     Three measured data supplement methods are presented for reverse engineering of sculpture surface with unknown regions (such as trimmed region or unreachable re-gion).
     针对基于实物的复杂零件反求工程中含有部分形状未知区域(如裁减曲面中的被裁减部分、测量盲区等)的复杂曲面反求CAD建模问题,提出了三种测量数据补充方法:①局部区域实物填充法。 ②补充设计数据补充法。
短句来源
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  曲面
     A Global Optimization Algorithm of Localization for Huge Sculpture Surface Blank
     大型复杂曲面类毛坯加工定位的全局优化算法
短句来源
     The mathematical model of the curve and sculpture surface of the winding mould has been made. The geometric modeling for the sculpture surface of the winding mould has been completed by the computer and the drawing software AUTOCAD 10. 0. The tree dimension graphic and NC code file of this mould has been produced.
     建立了绕线模各曲线曲面的数学模型,通过微机和绘图软件AutoCADV10.0进行绕线模曲面的几何造型,产生模具三维造型图和NC数据文件。
短句来源
     Research on Precision Evaluation for Finished Workpieces with Large Sculpture Surface
     大型复杂曲面零件加工精度评定问题研究
短句来源
     Surface reconstruction plays an important role in many fields such as design of car bodywork, cartoon facture about sculpture surface of human faces and 3D reconstruction of medical images etc.
     曲面重建在轿车车身设计、人脸类雕塑曲面的动画制作、医学图像三维重建等领域有着广泛的应用前景 .
短句来源
     With an optimizing surface triangulation as result, this algorithm is suitable for surfaces of arbitrary topology, including nonorientable ones, hence can be applicable to visualization in scientific computing, sculpture surface modeling, and reverse engineering.
     该算法适应于包括单侧曲面在内的任意不自交的拓扑曲面集,并且重建结果是相对优化的曲面三角形剖分,可以应用于科学计算可视化、雕塑曲面造型和反求工程等领域.
短句来源
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  自由曲面
     Study on Planning for Measuring the Sculpture Surface
     自由曲面测量的区域划分准则研究
短句来源
     This paper introduces a new theory that the concept in differential geometry of “contact” between curve and camber is applied to numbercally controlled machining sculpture surface. It puts forward the optimum contact condition for machining sculpture surface using cylindrical tool or bevel cutter with five coordinates co operating.
     本文把微分几何中曲线与曲面之间的“切触”概念应用于复杂曲面的数控加工,提出用圆柱铣刀或圆锥盘铣刀的外圆在五坐标联动中加工三维自由曲面的最佳切触条件。
短句来源
     Then it can meet the demand for the tool path generating computation of general sculpture surface by combining all the above-mentioned algorithms applied on them.
     综合应用上述算法,可以满足一般性自由曲面多点切触加工刀位计算的要求.
短句来源
  雕刻表面
     Sculpture Surface Ball-end Milling Machining of Variable Feedrate
     雕刻表面球形铣削的分段变进给率加工
短句来源
     During the sculpture surface milling machining,cutting force in ball end cutter along the tool path can be calculated according to the force model.
     雕刻表面球形铣削加工中,根据刀头的受力模型,可以计算整个刀具路径上刀头的受力。
短句来源

 

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      sculpture surface
    Based on the concept of Eular-Meusnier Spheres (EMS) that portrays the generic curvature model of surfaces, a new three-dimensional (3D) method for curvature gouge detection and elimination in sculpture surface machining is presented.
          


    In this paper, a new technique about 5-axis simultaneous NC for machining blades of large hydraulic turbine, in which involves the principal construction and principle of the machine tool, 2-axis NC universal rotary milling head, the special cutters and technological equipment, is describ(?)d briefy。 The organization principle of the programs of the blade's contours which includes sculpture surface moulding, cutter location data, graphical simulation display and postprocessor, is also introduced.

    简要论述了五轴数控联动加工水轮机叶片的新工艺,它包括五轴联动机床的主要原理与结构,两轴数控旋转铣头,加工叶片的工艺装备与特种刀具,叶片型面加工的程序编制原理,叶片型面的曲面造型,刀位轨迹数据处理,图形显示与后置处理。

    Natural damage to ancient stone sculptures or cultural relicts,especial the biodeterioration,has become a new research topic.The Liang stone sculptures during the Liang Dynasty in the suburb of Nangjing,which are a group of limestone sculptures and inscripted tablets of the Liang tombs,built in the period of 522-526 AD,have been enrolled in the list of National Cultural Heritages of China.The Liang stone Sculptures have been situated in the open air for more than 1400 years since they were built.The damages...

    Natural damage to ancient stone sculptures or cultural relicts,especial the biodeterioration,has become a new research topic.The Liang stone sculptures during the Liang Dynasty in the suburb of Nangjing,which are a group of limestone sculptures and inscripted tablets of the Liang tombs,built in the period of 522-526 AD,have been enrolled in the list of National Cultural Heritages of China.The Liang stone Sculptures have been situated in the open air for more than 1400 years since they were built.The damages to them belong to a kind of karst geomorphological phenomena,This paper presents a micro-morphological approach to the study on weathering of the stone sculptures.I. Observation on micro morphology of produced by natural damage.A. Observation in situLiang stone sculptures include stone sculptures of the mausoleums of Xiao Dan,Xiao Hui,XiaoJing and Xiao Xiu,The main types of sculptures are Bixie (a symbolic divine beast as evil-spirits exorciser),ornamental colums and inscripted tablets.The main types of the damage phenomenon can be classified in accordence to section morphology into: a) Solutional fissures and furrows,mainly along the suture line;b) Solutional pits, c) Meandering furrows, distributed on sculpture below the buried surface,d) Selective corrosional features.In order to understand the penetrating character of the fissures,we measured the weathering(solution) fissure along suture line on Xiao Hui' s Sculpture.The parameters measured included:a) Width of fissure mouth,b) The depth of the fissure with plug gauge of 0. 5mm and 0.1mm,The measured data show a trend that the wider the fissure mouth,the deeper the total fissure.We also calculated the outer angle and the inner angle between the corroded fissures ong rock walls,where the inner angle refers to the angle between rock walls of the fissure from 0.5mm to 0.1mm wide and the outer angle from mouth to 0.1mm wide.The data indicate that:a)Inner angles are smaller than outer angle generally,b) There is a trend that the larger the total depth of the fissure,the larger thd outer angle will be.The main results of the observation in situ are summed up as follows:a) The damage to sculpture surface is mainly due to the solution with several section types,b) The solution fissure formed along suture line is an initial fatal damage,which may cause the disintegration of the whole sculpture,c) There is a difference between the surface damage on the burried line and that below the line.d) There are lichen and algal covered surfaces with obvious biodeterioration.B.Lab ObservationWe identified the epi-and endolithic lichen and alage collected from the sculpture surface.The lichens identified are Caloploca sp.;Collama sp.,Diploschistes actinostomus,Lecanora muralis;and Verrucarin sp.,The algae include Gloeocapsa sp.and the species from the order of Chamaesiphomales and Chroococales.With optical stereo microscape observation,the micro solutional fissures with chasmolithic algae along suture line can be observed.The chasmolithic algae may form the patched solutional pits and the related relict micro steps with a height of about o.1 ̄0. 3mm.Calcite vein often forms a ridge with micro corrosion furrow on both sides.Algal coating may become full of crack with the tension of mucus while in dry season.With observation on certain minor solutional features under Scanning Electronic Microscope (SEM),the related ultral corrosional features were identified as follows:a) Bore-hole with diameter around 10μm formed by fungi filament of lichen,b) Ultral etched pits on minor patched erosional pits,composed of networks of ultral furrows which 1.5 ̄3μm wide.Under SEM,we observed the ultral features of the normal solution surface.The main characters are that:a) Ultral solutional pits are basically along the cleavage plane of calicite or fissure among calcite grains, b)There are still organisms and a few bioerosinal features,c) Calcite grain or micrite may loosen or even come off during the weathering (solution) processes.II.Discussion A. Micro-morphologic mechanism of natural damage The basi

    从地貌学角度较系统地分析了梁代石灰岩石刻表面自然毁损的微侵蚀机制,本文指出,雨水沿缝合线渗流,经多种地衣及兰藻、绿藻等生物作用而大大加强了溶蚀作用,导致石刻的崩解,并讨论此种特殊微侵蚀形态的形成机制在地貌学理论研究中的意义。

    After the computer aided design for the winding mould of the deflecting yoke, several geometric modeling methods have been analysed. The mathematical model of the curve and sculpture surface of the winding mould has been made. The geometric modeling for the sculpture surface of the winding mould has been completed by the computer and the drawing software AUTOCAD 10. 0. The tree dimension graphic and NC code file of this mould has been produced.

    在偏转线圈绕线模CAD之后,本文对几何造型的几种方式进行了分析。建立了绕线模各曲线曲面的数学模型,通过微机和绘图软件AutoCADV10.0进行绕线模曲面的几何造型,产生模具三维造型图和NC数据文件。

     
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