基于Pro/E的圆柱齿轮减速器的三维造型和运动仿真

基于Pro/E软件的高级建模技术和机构运动仿真等功能,实现了圆柱齿轮减速器各零部件和整机的三维造型设计及运动仿真。为Pro／E件的机械设计应用提供参考。通过添加运动驱动器,实现了减速器的运动模拟,减化了设计过程。     

基于Pro/E的简单机构运动仿真及应用

介绍了主流CAD软件Pro/E实现运动仿真的基本思想、方法,阐述了进行机构运动仿真的步骤,并以航模发动机为例进行了机构运动分析与仿真的具体运用,并总结了应用Pro/E进行运动仿真的优越性.     

基于Pro/E和Adams软件的涡旋压缩机虚拟样机研究

介绍利用Pro/E软件对涡旋压缩机零部件建模及虚拟装配,简述了从Pro/E软件导入Adams软件、建立Adams环境下的涡旋压缩机的过程,分析了各运动件的运动仿真,为后续运动学和动力学分析提供条件。     

基于Pro/E Mechanism的挖掘机工作装置运动仿真

在Pro/E 环境中,Pro/E 的 Mechanism 能方便地对任何实际的二维或三维机构进行较复杂的运动学分析.利用Pro/ENGINEER软件对挖掘机工作装置进行运动仿真,可为挖掘机工作装置进一步优化提供运动模型.     

基于Pro/E的凸轮机构设计和运动仿真

介绍了利用Pro/E软件进行凸轮机构设计和运动仿真.应用Pro/E的图形曲线特征和关系式工具,可准确、快速的生成凸轮实体;应用Pro/E的运动仿真功能,通过对机构进行运动学仿真和运动结果的分析,提高机构设计的准确性.     

基于Pro/E的汽车变速器装配及运动仿真的动画实现

探讨了在Pro/E的Animate模块中制作A121变速器拆装动画的方法;并利用Pro/E的Mechanism模块对A121变速器换档过程进行运动仿真.该装配动画及运动仿真的实现对其它用Pro/E设计总成的动画制作和运动仿真具有借鉴意义.     

型孔式棉花精量穴播器滚落清种过程的理论分析与仿真

为解决现有穴播器结构复杂及取种装置易疲劳损坏等难题,在原有的型孔式穴播器的基础上,创新设计了一种新型的结构更简单的取种装置。基于对穴播器运动过程的分析,建立了种子运动机理的数学模型,对清种过程中种子的运动情况进行了详细分析,并基于ADAMS软件平台建立了清种过程的多体动力学模型,仿真揭示了清种过程中种子的运动规律。结果表明：该穴播器的取种装置能有效地把多余的种子清除掉且在整个过程中不伤种、不卡种;该取种装置设计合理,数学模型正确,为该新型穴播器的运动学、动力学及优化设计研究打下了基础。研究结果为型孔式穴播器的设计与研究提供了新的思路,为样机的研制、台架机试验提供了理论依据与指导方向。     

夹钳机构的优化设计

在Pro/E环境下对初步设计的夹钳机构进行建模、装配及运动学仿真分析,发现模型运动学特性较差。为改善机构的运动学特性,将模型通过M echan ism/Pro接口程序导入ADAMS中进行优化设计,得到了改进机构运动特性的方法。在Pro/E下改进机构模型并再次进行运动学仿真,验证了改进结果的合理性。最后,通过平面几何知识对改进方法的合理性进行了证明。仿真结果表明,利用Pro/E和ADAMS联合仿真的方法可以为机械系统结构的优化设计提供一条有效途径。     

基于Pro/E的四冲程曲柄连杆机构装置虚拟装配及运动仿真动画的实现

分析了四冲程曲柄连杆机构装置和三维实体建模与虚拟装配,并详细介绍了运动仿真与动画制作过程,以期对其他用Pro/E设计总成的运动仿真动画制作具有一定借鉴意义,在Pro/E环境下完成四冲程曲柄连杆机构装置的零部件三维实体建模、虚拟装配与运动仿真,可为产品开发提供可靠的前提条件。     

纸杯机卷封装置运动特性分析与纸杯成型质量控制

纸杯机卷封装置的运动相对复杂,在对纸杯成型工艺及纸杯机卷封装置组成结构分析的基础上,利用Pro/E软件,建立了基于虚拟样机技术的卷封装置模型,主要包括凸轮机构、连杆机构、曲柄滑块机构等传动机构,以及工艺执行机构抱合器.并利用Pro/E中的“机构”模块对所建立的卷封装置模型进行了运动仿真,绘制了执行机构的运动曲线图.通过运动特性的分析,证明了该模型的正确.同时分析了卷封装置中凸轮的磨损状态,以及对纸杯成型质量的影响,为提高产品质量提供了设计依据.     

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.     

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。     

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....     

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.