轴承零件的三维参数化设计和运动仿真

针对滚动轴承的三维设计和运动，运用Pro／E中的Pro／PROGRAM模块，通过输入参数数据，自动生成三维模型从而实现参数化设计。利用Pro／E的机构设计扩展模块Mechanism Designe Xtension（MDX），进行机构运动仿真和简单干涉分析。并举例说明了参数化设计的具体步骤与运动仿真结果。     

下肢康复训练机器人步态运动机构设计

借助于Pro／E软件建立了下肢康复训练机器人步态运动机构的参数化运动学模型，基于对不同参数简化模型的分析，设计了一种步态运动机构，对设计结果进行了运动学仿真，仿真结果表明该机构能够较好地模拟人的实际步态运动，符合下肢康复系统的整体要求。同时得出了实现理想步态运动所需的驱动电机等效速度参数，为进一步的机构控制系统设计提供了必要依据。     

UG实现参数驱动的机构三维动态仿真

论述了基于UG的运动机构的三维运动仿真的技巧，结合光学操作台的设计实例，阐述了利用参数驱动机制进行机构三维运动仿真的具体实施方法。     

牙轮钻机回车机构的虚拟装配与运动仿真

文中介绍了基于Mechanism的机构运动仿真的基本工作流程,对Pro/E进行二次开发,实现了高变位齿轮的参数化三维实体设计,通过机构的运动仿真,动态观看机构的啮合和运动情况,测试机构的有关运动性能的参数,有利于机构优化和提高设计效率,可以构成机构的虚拟设计、制造及仿真分析的平台.     

机构运动仿真的机构设计中的应用

介绍了集成化工程分析软件I-DEAS机构学（Mechanism）模块的功能，通过机构运动模块在硫化机机构设计中的应用，实现了机构的运动学分析仿真，精确描述复合运动体空间运动，分析了机构空间运动位置及运动参数，并进行了干涉检查，为设计提供一种科学依据。     

粮油食品机械中的机构运动仿真及优化设计

建立了机构运动仿真及参数优化的数学模型。利用该优化数学模型，机构能够对给定的运动轨迹实现最佳逼近。利用MATLAB实现了机构的运动仿真及优化设计，计算结果表明了该方法的有效性。     

基于运动仿真的凸轮机构参数逆向CAD方法

提出了利用机构运动仿真和实测模型获取平面盘形凸轮从动件运动规律和动程角等运动参数,再利用这些运动参数和有关结构尺寸,重新解析设计的逆向CAD方法,给出了在Pro/E软件平台上实现凸轮机构运动仿真和获取机构运动参数的过程.应用实例证明该方法高效直观,所设计的凸轮机构精度高,可直接用于生产.     

Visual LISP在机构运动分析中的应用

以铰链四杆机构的运动学分析系统为例，以Visual LISP为开发语言，实现了机构简图的参数化设计，机构运动曲线的生成，机构上点的运动轨迹的绘制，以及机构的运动仿真。     

基于MATLAB的多功能下肢康复训练辅具的机构运动分析

根据人机工程学原理,为满足老年人和残障人的日常生活需求,设计开发了一款多功能康复训练辅具.对其上肢提升机构,建立机构的运动分析数学模型,利用MATLAB软件进行机构运动仿真分析,在指定各项设计参数后,通过仿真获得机构的运动参数和运动曲线,为机构的运动性能评价及康复辅具的智能控制提供必要的依据.     

自动机械中槽轮机构的参数化设计与仿真

以自动机械中常用的外槽轮设计为倒，建立了槽轮机构参数化设计的数学模型，利用VB对AutoCAD的二次开发技术，成功实现了槽轮机构的参数化设计及运动仿真。该系统在选定槽轮机构的运动工况及受力条件的情况下，能够对设计结果进行自动校验，并可以实现槽轮机构工程图的自动输出，进行尺寸参数及技术条件的标注，提高了槽轮机构的设计效率。为槽轮机构的数字化设计、加工提供了理论依据。     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

ANGULAR DISTORTION ALLOWABLE VALUE AND ASSESS METHOD OF WELD ON COKE TOWER

A graph as the new engineering method for estimate the safety of bulging deformation of coke tower is proposed. Through stresses analysis of circumferential weld of coke tower and comparing the stresses produced by pressure with heat stress of steady state, residual stress, bending stress produced by both itself weight and wind loads, it showed that the stresses produced by pressure on the angle distortion are the main factor of equivalent stress of the combined stress. After comparing four kinds of stress controlling conditions, the relation to stress with depth of angular distortion, grade of curvature of angular distortion and half of region of angular distortion has been inferred. Graph of deformation allowable value of coke tower for different condition by angular distortion and half of region of angular distortion has been plotted. The five steps for its engineering use have been explained. The lighter the grade of curvature is, the larger of bulge allowance, may be, and the bigger of depth of angular distortion may pose too. For the coke tower with a popular structure of Dg 5 400 mm×28 mm, the result by graph is nearly more than the result of two formulas formed by other research, the error is less than 7.0%. But, the graph can be easily applied to different size of angular distortion.