一种多视图的视图分离和视图关系确立方法

提出一种多视图分离和视图关系确立方法,在分析线条连通集合以及线条连通集合之间包容关系的基础上,进行视图分离;根据制图规划以及图形标注信息建立视图之间的毗邻关系;较好地解决了包括位置任意布的斜视图、局部视图在内的机械零件图多视图的视图分割和视图关系确立问题,为后续图形信息高层理解提供了良好的基础。     

一种科学工作流视图抽象方法

为了解决复杂的科学工作流过程视图造成用户理解和数据溯源困难的问题,在对科学工作流及其视图进行形式化定义的基础上,提出一个可保持数据溯源正确性的视图抽象算法——Extend-and-Merge算法.该算法从科学工作流中的一个任务出发,通过寻找及合并三种合理子结构,最终得到保证溯源正确性的合理抽象视图,并设计实现了一个软件工具用于可视化展示.通过一组真实科学工作流过程数据上的实验表明,Extend-and-Merge算法可在多项式时间内获得规模为原来过程13.1％的合理抽象视图.     

Inventor软件表达视图功能的具体应用

Inventor是一款全新的工程设计软件,表达视图是其功能中不可或缺的一部分,表达视图在设计中发挥着重要的作用。以双平稳爬楼轮椅的类阿基米德叶轮的设计为例,在Inventor表达视图特点的基础上探讨表达视图的操作方法,为提高新产品的设计质量和效率提供参考。     

“体视图”的一种简易绘制方法

体视图是《机械制图》教学中较好的虚拟现实模型。绘制体视图一直比较困难。为此提出将SolidWorks模型透视图与香格里拉机械CAD软件描线—补线手工错切相结合的方法,实现了体视图的简易、近似绘制。     

用AutoCAD标注尺寸及公差的方法

笔者发现一些AutoCAD的用户,在标注尺寸及公差时,采用的方法不当,须应用分解、修改的指令后才能完成标注,还误以为软件提供的功能就是如此。实际上,只要掌握了适当的方法,发挥出软件相应功能的作用,用AutoCAD标注尺寸及公差,是一次完成的。这里介绍一种用AutoCAD标注尺寸及公差的方法。 1.按1:1的比例绘图 此处1:1指的是屏幕上一个绘图单位=物体上1mm。采用这一比例不仅是为了便于绘图,节省那     

AutoCAD尺寸公差标注的七种方法

介绍了AutoCAD2006中尺寸公差的各种标注方法和编辑技巧，以实现尺寸公差的快速标注。     

一种STEDF的可视图环境建模方法

提出的一种STEDF的可视图建模方法,可有效的提高环境模型建模效率,并且使移动机器人在路径规划的算法更加高效。在环境模型中通过删减融合一些不必要障碍物的手段,利用机器人所在的起始点、目标点和障碍物之间的关系,在不对路径规划的结果有影响的情况下建立一种极大程度下减少可视边的可视图。该方法在前期的环境建模中由于可视边是移动机器人的路径的原因,所以节约了很多环境建模的时间。根据有效的仿真结果可知,这里的方法极大程度的使路径规划算法的速率在原来的基础上取得了非常大的进步。     

ADAMS软件中绳索类物体的一种建模方法

针对ADAMS软件中绳索类大变形柔性物体直接建模困难的问题 ,提出并分析了Bushing连接模型的建模方法 ,并运用该模型实现了对岸桥集装箱拖令系统单元的虚拟样机分析     

三维物体的任意方向二维断面图像提取

医学三维数据场可视化是当前科学计算可视化应用的重点。在Visual C＋＋平台下,结合可视化工具包VTK,对DICOM格式的CT图像序列进行三维重建。用VTK对CT图像序列进行处理,使其在屏幕上能够显示任意方向的二维断面图像,并且可以用鼠标对断面图像进行缩放、平移、旋转等实时交互操作,从而弥补了CT不能按任意角度扫描的缺憾。     

基于特征尺寸的机械零件图样尺寸标注方法研究

为确保零件图尺寸标注的完整性,探讨了一种基于特征尺寸的机械图样尺寸标注方法,通过应用实例验证了方法的有效性和局限性,对于机械零件图样尺寸正确标注有较好的实用价值.     

一种差分放大电路线性范围展宽的方法

差分放大电路的线性范围比较小,在大信号工作时会产生非线性失真.针对这一问题,本文首先对差分放大电路的传输特性进行了分析,然后拟定出差分放大电路的模型,通过严格的理论推导和定量分析,很好地解决了差分放大电路线性范围小的问题.     

AutoCAD中生成局部放大视图的简便方法

分析了在AutoCAD境下自动生成局部放大视图的方法,并介绍了利用AutoLisp进行程序设计的过程。     

Three-dimensional reconstruction of a periodic specimen from a single view of an oblique section

Methods are described for producing a three-dimensional reconstruction from a single view of an oblique section through a two- or three-dimensional crystal. The image produced by the electron microscope corresponds to a projection through the thickness of the section, which smears out the details of the structure. This projection operation can be described mathematically by sets of linear projection equations or equivalently by convolution of the density in the unit cell with the section thickness. Solution of the projection equations or other methods of deconvolution reduces the smearing and gives a three-dimensional map of the density within the crystal superior to that obtained by direct inspection of the image. The degree of improvement attainable depends on the noise level in the image but computational experiments indicate that a factor of at least four should be achievable. The method, which is most powerful when the section thickness is small, has the advantage over conventional methods involving tilted that it is not affected by changes in section thickness on electron irradiation.     

Determining the distance to a ferromagnetic object with unknown magnetic characteristics

The possibilities for determining the distance to a ferromagnetic object with unknown magnetic characteristics by the measurement of its magnetic field at two spatial points are considered. An unconventional measurement device, which allows us to determine the distance to an object in real time, as well as an algorithm and software for the processing of measurement results with the computer-generated visualization of the parameters of a magnetic field induced by an object, were developed. The error in determining the distance to a sought object does not exceed 20.0%.     

Magnetic mutually inductive transducer of the distance to the surface of a ferromagnetic object

The possibility of using a mutually inductive transducer as a measuring transducer of the beats of a round cylindrical surface in order to measure the axis misalignment of welded joints was investigated. The optimal design values of the transducer were selected based on the results of physical and mathematical simulations of the transducer’s magnetic field interaction with a ferromagnetic surface; the influence of the edge effect was estimated as well.     

Use of a posteriori information to control of a poorly formalizable dynamic object

This paper considers a method of using a posteriori information to correct control actions on a poorly formalizable dynamic object and a new design of an observer of unmeasurable variables based on the method of analytical design of aggregated regulators and the concept of recognition of the states of a complex object from the time series accompanying its operation. Numerical simulation results are given.     

往复丝杠的设计方法

本文首先介绍了往复丝杠的工作原理,分析了往复丝杠设计的难点,随后介绍了双向丝杠的设计方法,其中引用了一些经验参数。随后分析和研究了转向转向滑块的外形结构。最后通过实例设计了一款双向往复丝杆,并使用ansys对其工作中的受力状况较差的一段行程进行了仿真校核,结果证明该设计方法可以设计出满足使用要求的往复丝杠。     

提高单级卧式双吸式离心泵耐汽蚀性能的措施和途径

分析了单级卧式双吸式离心泵发生汽蚀的部位和外观特征、运行特性及汽蚀发生的原因和主要形式,提出提高单级卧式双吸式离心泵耐汽蚀性能的措施和途径.     

The way to choose resonance vibratory feeder parameters to form the structure of a unit surface

It is revealed how granulated solids influence the effect (revealed earlier for the point mass) of hard excitation of forced vibrations under planar transportation. The vibratory feeder with electro-dynamic microexciter has been analyzed in the first approximation by the averaging method. For the granulated solids, the effect is connected with the system structure variation (equation of motion), but, in addition to the number of degrees of freedom variation, other parameters and mode conditions can be varied. The relationships between machine parameters and the cross section of the flow and material consumption put on to the unit surface are obtained. Comparison with experimental data shows that the results correlate well qualitatively and numerically. The estimation of maximal possible error of the first approximation obtained according to the small parameter value is close to maximal disagreement between the experiment and the theory.     

视觉伺服机器人打击运动目标的轨迹规划

讨论了视觉伺服机器人在打击运动目标时的轨迹规划问题,提出了一种在平面上打击运动目标的方案,包括目标运动参数估计算法、目标跟踪和接近的算法.这种方案适用于打击近似作直线运动目标的轨迹规划.最后给出了一些仿真结果.