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。     

热管技术在有机热载体锅炉烟气余热回收上的应用

介绍了热管余热回收技术的原理,工程应用进行简要描述,列举了在燃煤有机热载体锅炉中,利用热管余热锅炉回收余热烟气,工程实例及效益分析。     

面向数字样机的知识获取技术及知识工程系统的研究

分析数字样机(DMU)和知识工程(KBE)技术的内涵,总结出DMU知识获取方法,解决了面向DMU的KBE系统知识获取问题;提出DMU产品数据管理(PDM)与KBE的集成产品设计新理念.研究基于实例和神经网络的KBE系统设计流程,并给出摩托车设计KBE系统的详细应用实例.     

循环流化床锅炉烟气余热的利用

针对循环流化床锅炉的特性,对其烟气余热利用进行了理论分析。循环流化床锅炉由于实现炉内脱硫,烟气中三氧化硫的含量低,所以烟气的露点低,为烟气余热利用提供了条件。列举了循环流化床锅炉烟气余热利用的工程实例,为余热利用技术的推广提供了参考。     

基于知识的船体结构件重用系统

阐述分析了知识工程的基本原理、方法和基于知识的船体结构件重用系统,以及系统的主要工作流程和组成部分,采用基于SpreadSheet和XML的知识表示法,通过知识工程原理实现了船体结构件的重用,结果表明该重用系统可明显提高船体结构件的设计效率和设计质量。     

燃气轮机分布式能源技术在导热油余热锅炉项目中的应用

文中介绍了燃气轮机分布式能源技术,具体为燃气轮机与余热直燃机相结合的系统、燃气-蒸汽联合循环系统和燃气轮机与余热锅炉结合的系统。并以华峰集团有限公司重庆华峰分布式能源项目为实例,阐述燃气轮机与余热锅炉结合的系统中的燃烧系统、热力系统、电力系统、环保排放及主要技术经济指标等,分析该项目的意义。     

运用知识工程的摩托车设计系统研究

综合运用知识工程(KBE)技术、动态设计技术等,在摩托车总体设计阶段预测系统的动态特性,研究整车的动态性能匹配.构建了基于KBE的摩托车总体设计系统结构,研究了其工作流程和各应用子系统的功能结构,开发了基于KBE的摩托车总体设计系统--MCODS,通过实例验证了系统的可行性和实用性.     

基于知识的起重机械辅助设计系统研究

以提高起重机械产品设计的设计经验和设计知识的重用为目的,将通用设计理论与基于知识工程的设计方法应用于产品的设计中。研究了知识工程领域中,知识表达与知识推理相关技术,提出了综合面向对象的设计模型与基于实例的设计技术的产品设计方法,并结合通用设计理论构建数字化设计系统的结构框架。以桥式起重机设计系统的开发实现具体实例的数字化设计,结构表明方法有效可行。     

CommonKADS在夹具结构设计中的应用

为提高夹具设计系统的实用性并改进结构设计过程,应用知识工程来开发智能化夹具结构设计系统。首先应用CommonKADS方法构建系统的知识模型,刻画知识的上下文和相互依赖关系。在该模型中,领域知识将结构设计涉及的知识项概念化,提出典型结构以替代基于实例推理方法中的设计实例;任务知识用于描述任务分解和控制策略;推理知识用于描述基本推理和推理结构。将知识模型的内容和结构映射到系统体系结构中,开发了夹具结构设计原型系统。设计过程采用自动设计和交互设计的混合模式,主动支持设计者进行创新设计。最后,以实例说明了知识模型和知识系统的应用,验证了知识工程方法的有效性。     

基于FPBS设计原理的余热锅炉结构设计

通过对模块式余热锅炉设计方法的研究,提出一种全新的开发设计模式——余热锅炉快速设计。该方法基于Solid Works参数化设计技术、模块化设计技术、产品数据管理技术等理论,在对模块化的余热锅炉产品族合理划分的基础上所形成的一套设计理论体系,涉及从产品需求的提出到设计数据保存的整个余热锅炉设备设计过程。     

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.