基于可拓变换的产品性能冲突传导协调方法

针对产品性能设计中的多性能优化冲突问题,提出了一种基于可拓变换的产品性能冲突传导协调方法。利用可拓设计方法量化产品性能需求及形式化建模描述,构建多性能检索机制,确定待优化性能;在此基础上给出触发性能及其与产品结构量化映射机理,输出触发性能满足方案;结合传导协调方法,建立产品性能之间的动态传导关系,形成产品性能设计创新方案。最后以大型螺杆空压机为例,验证了该方法的可行性及有效性。     

性能传导知识挖掘配置设计系统

为实现计算机支持下产品的快速响应设计,提高产品开发效率,开发出了一种性能传导知识挖掘配置设计系统.该系统主要分为产品需求实例管理、产品配置设计过程管理、产品配置设计知识管理、产品配置方案管理4个功能模块,通过将客户的模糊性能需求转化为需求信息物元,在实例库中进行相似实例检索,构建关联函数,对检索到的不满足要求的最相似实例进行了拓展分析和可拓变换,消除了目标实例和条件实例之间的矛盾.通过设定阈值提取传导特征和传导对象,比较了相似实例变换前后性能特征数据获取主动变换对于传导特征的影响程度,通过可拓分类获取了传导变换引起的质变、量变知识.最后,以大型螺杆空压机为例,验证了该系统的有效性.研究结果表明,通过挖掘配置设计过程中的传导知识,对于提高产品配置准确性和产品开发效率有重要意义.     

产品创新中技术冲突的粒度分类与可拓协调方法

针对产品化创新过程中技术冲突的复杂性与分类模糊问题,提出一种冲突问题粒度分类与可拓协调方法。该方法通过多种技术需求的基元集成运算,明确技术创新设计意图;结合粒化方法,建立了冲突问题剥离与传导机理,构建了冲突问题的多层次粒化模型;应用公理化设计理论,建立了最细粒度冲突问题的结构化映射模型,并作为问题协调的考核指标;在此基础上,建立了多粒度层次的冲突问题协调技术创新流程,设定关键的变换步长与传导效应动态调控机制,给出技术创新产品化方案。以敞开式质谱离子源产品化创新及其样品检测应用为例,验证了该方法的有效性与可行性。     

基于性能驱动的可拓数据挖掘产品配置设计方法研究

针对现有产品配置设计方法中对客户性能需求研究的不足,结合可拓数据挖掘方法提出了基于性能驱动的可拓数据挖掘产品配置设计方法研究。首先通过对客户个性化需求的定量与定性化分析,建立客户需求分析模型;其次对配置模型的参数知识进行可拓知识挖掘,并对产品布局结构的变换阈值知识进行相互匹配与矛盾问题消解,建立变换消解模型及满足客户需求的可变换阈值解空间;然后在此基础上,对产品配置过程中的知识组合矛盾问题,进行基于可拓数据挖掘的传导变换,求解出满足客户需求的配置解空间;最后基于Visual C++6.0、Solidworks等平台开发软件建立了产品的快速配置系统,通过实例测试,验证了该方法的准确性和有效性。     

基于可拓逻辑的产品族可配置规划研究

为更好地处理产品族可配置规划大量带有矛盾前提的知识,通过顾客需求获取、可拓变换和可拓聚类等方法来解决配置需求动态增加、配置阈值确定和冲突消解等三个问题,提出了基于可拓逻辑的产品族可配置规划模型.首先通过共轭分析法得到需求基元,建立需求与产品族结构特征之间的映射关系,利用町拓规则推理,从定性角度得到能够满足顾客需求的一系列产品.然后在需求基元图中,应用变换矩阵对需求基元加以变换,由顾客根据变换结果再次输出需求基元,与最初需求基元计算相容度,利用改进的遗传算法动态取得配置阈值来判断变换的可行性.最后,利用可拓聚类和聚类图理论实现产品族内部的稳定模块和可变模块的划分.该方法已应用于冰箱原型系统设计.     

产品结构的适应性变换方法研究

适应性设计是一种在面向产品全生命周期设计中解决矛盾问题的有效途径.然而,现有设计方法很难客观地反映定性定量相结合求解设计矛盾问题.为此提出一种基于结构变换的产品适应性设计方法.该方法通过定义设计基元,对产品的初始机构进行适应性分析,建立传导矛盾环系统,及满足产品功能-结构的适应性设计规则、适应度函数和与之对应的产品适应性模型,从而确定适应性设计的关键问题.建立适应性设计流程,通过传导变换解决产品设计基元之间的冲突,输出初始设计方案.最后将方法应用于某型号CPM下肢康复器适应性设计.应用实例表明:该设计方法不仅能快速满足不同需求下的个性化要求,而且能为计算机参与解决产品设计矛盾问题提供一种可行的途径.     

基于可拓挖掘的产品方案再配置方法

为了在扩大产品配置空间、争取最优解的同时,提高配置效率,快速消解领域知识耦合过程中的矛盾,提出了一种基于可拓挖掘的产品方案再配置方法.将配置方案用物元对的形式表示,通过计算不同物元对间的传导效应,将一般性的配置知识转化为传导知识;建立方案再配置过程的矛盾问题转换方式,挖掘出变换过程中配置要素之问的相互影响;定量化衡量方案变换过程的可配置程度,揭示可拓变换对产品结构、性能和功能的影响,从而对配置过程中的可变知识加以分析、提取和利用,生成能够满足设计要求的可变方案.将所提方法应用于新型油锯的配置设计,验证了该方法的有效性.     

螺杆空压机用消声器的设计和优化

高转速的干式螺杆空压机的排气管路中的噪声都比较大,为了有效降低螺杆空压机的排气噪声,利用双层微穿孔板声学理论,建立了由微穿孔板的孔径、板厚、穿孔率、腔深等结构参数计算双层微穿孔板结构扩散场吸声特性的数学模型,设计了一种适合该类空压机用的消声器,并利用遗传算法对其结构参数进行优化,得到双层微穿孔板最佳的吸声特性。优化结果表明:优化后的双层微穿孔板消声器的吸声系数比优化前大大提高,更有利于高转速干式螺杆空压机减噪的需求。     

鞋类产品和谐智能CACD系统研究

针对计算机辅助概念设计的瓶颈问题和关键技术,一方面给出鞋类产品的物元系统表示方法、鞋类产品概念设计中矛盾冲突模型和矛盾冲突解决的可拓工程方法以及可支持鞋类产品概念设计的可拓评价决策模型;另一方面提出面向CAD的CACD的和谐化智能化研制思想,基于SolidWorks系统开发和谐智能计算机辅助鞋类产品概念设计系统,即人机合理分工、人机友好交互、人机智能结合CACD系统。     

鞋类产品和谐智能CACD系统研究

针对计算机辅助概念设计的瓶颈问题和关键技术,一方面给出鞋类产品的物元系统表示方法、鞋类产品概念设计中矛盾冲突模型和矛盾冲突解决的可拓工程方法以及可支持鞋类产品概念设计的可拓评价决策模型;另一方面提出面向CAD的CACD的和谐化智能化研制思想,基于SolidWorks系统开发和谐智能计算机辅助鞋类产品概念设计系统,即人机合理分工、人机友好交互、人机智能结合CACD系统。     

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.