基于实例推理的磁材压机模块化设计研究

模块化设计通过不同功能模块的划分与组合,快速设计出满足用户需求的新产品,已成为快速设计的重要方法和核心技术。将基于实例推理技术应用于产品模块化设计,可以解决设计过程中对整体方案检索能力不足的问题,使得产品设计方法更合理、更高效。以磁材压机为例,论述了基于实例推理的机械产品模块化设计流程,并对其模块划分、实例库创建、相似度计算、有限元分析等关键技术做了详细研究,为此类产品的快速设计提供了一定的参考价值。     

堆垛机模块化设计研究

阐述了现代模块化设计的内涵和特点,讨论了基于模块化设计方法的堆垛机产品快速设计体系,研究了在堆垛机模块化设计中所需的功能模块以及融合参数化、变量化等设计手段的实现方法。最后,以某型号堆垛机为例,提出了结合PDM技术对其功能模块进行模块数据管理,实现产品配置设计。     

飞机工艺装备模块化设计系统技术研究

模块化设计是产品快速设计的通用技术,是简化产品设计、减少开发成本和缩短研制周期的有效方法之一.基于模块化设计方法,研究飞机工艺装备快速设计技术和飞机工艺装备模块的重复利用技术,开发飞机装配型架设计系统.最后,基于模块实例推理技术实现飞机工艺装备的快速设计.     

基于模块化的余热锅炉快速设计研究

以余热锅炉为研究对象提出了一种基于模块化的快速设计方法。研究了余热锅炉的模块划分方法、知识工程的应用和基于实例的推理技术,通过对余热锅炉设计流程的分析说明了模块化设计的特点,并以水保护段为例,验证了模块化思想的有效性和可行性,证明了将模块化设计思想运用到产品的快速设计中能很好地解决客户的个性化定制需求与产品开发周期较长的矛盾,快速响应个性化市场的需求。     

电气产品绿色模块化设计方法研究

绿色设计强调在产品全生命周期内,着重考虑产品的环境属性并将其作为设计目标,模块化设计则以面向模块和功能分析为主要特征,能够通过模块的选择与组合快速形成产品系列。将绿色设计思想与模块化设计方法结合起来,提出了绿色模块化设计方法并简要分析了其设计流程。模块化设计技术因其能缩短产品开发周期,快速响应市场变化,相对延长产品生命周期等优点,得到越来越广泛的应用。     

电气产品绿色模块化设计方法研究

绿色设计强调在产品全生命周期内,着重考虑产品的环境属性并将其作为设计目标,模块化设计则以面向模块和功能分析为主要特征,能够通过模块的选择与组合快速形成产品系列.将绿色设计思想与模块化设计方法结合起来,提出了绿色模块化设计方法并简要分析了其设计流程.模块化设计技术因其能缩短产品开发周期,快速响应市场变化,相对延长产品生命周期等优点,得到越来越广泛的应用.     

基于一种改进聚类算法的雷达导引头产品功能模块划分方法研究

提出了我国飞航导弹雷达导引头产品的系列化和快速设计的要求,指出导引头产品的模块化设计是实现该要求的重要手段;采用一种改进的聚类算法来实现导引头产品功能模块的划分,该算法是将划分方法中的k-平均算法结合导引头设计的实际过程进行改进,形成k-最短距离算法;给出了雷达导引头产品功能模块间的相异度评价准则。以雷达导引头的目标跟踪模块为例验证了该算法的正确性和实用性。     

基于知识工程的电缆保护产品模块参数化设计研究

为了缩短大规模定制产品的设计周期及降低开发成本,解决工程经验的重用问题,提出了一种新型的电缆保护产品快速设计方法。将知识工程与计算机辅助设计技术相结合,并基于产品模块化技术和实例推理技术,实现了电缆保护产品的系列化、标准化和通用化,构建了该产品的快速模块参数化设计系统。经实例验证,该系统明显缩短了电缆保护产品的开发周期,提高了企业产品的开发效率。     

基于模块化的云梯消防车协同设计研究

针对云梯消防车设计的柔性、设计的概念化、产品性能优化的需要,探讨了基于协同设计的云梯消防车功能模块化体系架构。基于模块化思想和Visual C++软件开发平台,构造分布式功能模块交互界面。各个分布式功能模块共享云梯消防车信息模型中的数据,进行设计信息的通信和交流,并通过C++程序对Matlab后台调用,实现结构的优化,保证了协同设计中的数据一致性。采用了基于模糊数学理论的冲突消解方法来协调不同学科之间的目标冲突。     

行星传动电动葫芦的模块化参数化设计技术

随着经济建设的飞速发展,模块化参数化设计已经成为当今制造业产品的主要设计模式,成为企业快速占领市场和开发新产品的必备手段。以行星传动电动葫芦作为研究对象,以Pro/E为设计平台,研究了行星传动电动葫芦基于模块化的参数化设计技术,研究了模块化参数化技术的基本原理及实现方法,在很大程度上改良了传统设计模式的弊端,缩短了设计周期,提高了设计质量和效率,适应了企业的快速发展。最后以行星传动电动葫芦的卷筒组为例,讨论了模块化参数化的实现方法,取得了较好的结果。     

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.