一种权重未知条件下的VIKOR大群体决策方法

针对权重未知的模糊多属性大群体决策问题,提出基于Humming距离构建决策者权重优化模型。采用区间直觉模糊决策矩阵表达决策者的评价信息,用MATLAB编程求解优化决策者权重;结合决策者权重,采用区间直觉模糊加权平均算子(IIFWA)获取综合决策矩阵,用信息熵计算指标属性权重。基于VIKOR框架,采用区间直觉模糊均衡交叉熵计算各方案、临界解与理想解的空间测度,实现方案排序。通过一个实例进行验证并与其他方法对比,说明了所提方法的可行性和有效性。     

基于信息公理的混合型多属性产品方案评价

研究了指标属性值包含实数、区间数和模糊数的混合型多属性产品方案评价问题,考虑了评价指标设计范围不确定的情况,提出了一种基于信息公理的评价模型,并给出了具体的评价方法和步骤.通过确定每个方案各指标满足功能要求的概率,计算各方案的信息量,以信息量为统一测度比较方案间的优劣程度,实现方案的优劣排序.决策者不必给出各评价指标的权重,也不需要对决策矩阵进行规范化,从而为解决混合型多属性评价优选问题提供了一条新的途径.以汽车起重机综合评价为例,说明了信息公理的混合型多属性评价方法的可行性.     

权重信息不完全的区间型多属性群决策的一种新方法

针对权晕信息不完全、决策者的偏好信息和决策矩阵元素均为区间数的不确定多属性群决策问题,提出了一种新的群决策方法.引入决策者的心态指标,得到带心态指标的决策矩阵,再通过求解主、客观偏好的最大总偏差最小化的优化问题,确定属性的权重.利用有序加权几何平均算子给出各方案的群体综合属性值和排序结果.应用实例验证了方法的可行性和合理性.     

基于决策者方案偏好的新产品开发方案选择方法

为充分体现新产品开发方案选择决策过程中决策者的主观偏好对决策结果的影响,提出基于决策者方案偏好的新产品开发方案选择方法。鉴于方案选择过程中信息的模糊性和不确定性,评价指标属性值以区间数形式给出,以减少决策信息的丢失。利用向量规范化方法规范化评估团体决策矩阵;通过企业内决策者给定其对备选方案的主观偏好值,并引入修正系数进行修正;通过区间数相离度获取使评估团队与决策者偏好总偏差最小的属性最优权重向量;集结属性权重向量和规范决策矩阵,得出各备选方案的综合属性值;通过两两比较区间数形式的综合属性值,建立可能度矩阵并计算其排序向量进行方案的排序择优。应用实例及案例对比分析表明,该方法对新产品开发方案选择是有效且可行的。     

模糊随机环境下的汽车租赁方案指标权重确定方法研究

为解决指标权重未知的模糊-随机多属性决策问题,构建了基于相似性差异最小化的权重优化模型确定指标权重,采用逼近理想解法实现决策过程。首先,运用区间直觉模糊集和随机占优理论定量化处理决策者的模糊-随机评价信息;其次,基于初始决策矩阵和综合决策矩阵之间的相似性差异构建指标权重优化模型;最后,根据定义的正、负理想解,运用区间直觉模糊交叉熵和欧氏距离分别测定模糊指标和随机指标的偏离度,基于改进的TOPSIS框架整合模糊指标和随机指标的相对贴近度以实现方案排序。实验显示,所提方法更能够方便地确定各指标权重。分析表明,所提方法避免了其它权重确定方法的不足之处,具有很好的敏感性,适用于指标权重未知的模糊-随机多属性决策问题。     

基于AHP和区间模糊VIKOR的产品方案评价

提出一种基于层次分析法(AHP)法和区间模糊多准则妥协解排序法(VIKOR)的产品方案评价模型。在AHP法中定义九级标度来衡量评价指标间的重要度,构建判断矩阵,进而确定评价体系中评价指标的权重。在进行产品方案性能评价时,由区间模糊理论表达信息的不确定性并建立区间模糊评估矩阵,定义改进的理想解和负理想解,在此基础上计算群体效益和最大个别遗憾,由此得到VIKOR综合指标,据此对方案进行比较和排序,并进行了实例分析。结果表明,该评价方法和理论具有一定的实用性和可行性。     

不确定条件下网络化协同设计中冲突仲裁方法研究

针对协同设计冲突仲裁问题,提出了一种多类型指标的混合属性决策方法,给出了其仲裁原理和步骤。先搜集所有可能的解决方案,而后用不确定语言来衡量其评价指标的重要程度,建立模糊互补矩阵,并计算反映各指标优劣关系的排序向量,即指标的权重;然后确定各备选方案在各指标下的属性值,并用加权算术平均方法计算各备选方案的综合属性评估值;最后对各候选方案的综合属性评估值进行优劣关系排序,排序向量中值最大的分量对应候选方案为优选方案。还通过实例来说明该方法的具体实现,并验证其实用性。     

不完全信息条件下产品方案评价方法

针对指标权重和指标值信息都不完全的方案评价问题,提出了一种基于二次规划的方案决策方法。首先将机械产品方案的评价问题描述为不完全信息条件下的多目标决策问题,然后在对决策矩阵规范化处理的基础上,将不完全指标权重和指标值信息用线性关系式表示并将其视为未知变量构建二次规划模型,经求解得到指标权重和指标值,进而可计算出方案的评价值,选出最优方案。介绍了该方法的基本原理和步骤,最后通过一个机械产品的评价实例证明了方法的实用性和有效性。与其他方法比较,本文的方法简单方便,计算量小,保证了较强的实用性。     

利用AHP与PROMETHEE的产品设计方案优选方法

研究利用层次分析法(AHP)与排序组织法(PROMETHEE)进行产品设计方案排序与优选问题.在建立定性与定量相结合的决策准则体系的基础上,首先使用AHP确定属性权重,然后使用PROMETHEE计算偏好指标和各方案的净流,获得方案的完全序.该方法以设计者的目标与价值观为导向,又兼顾了属性信息的不确定性,具有一定的应用价值.     

改进熵权逼近理想解排序法的航空发动机限寿件模糊风险评估

以航空发动机限寿件典型故障模式为评估对象,将风险指标模糊化,并以信息熵权作为属性权重,对逼近理想解排序（TOPSIS）方法进行改进,提出一种新的限寿件风险评估方法。以故障模式的严重度、发生频度和被检测难易度这3个参数为主要风险指标,建立三角模糊数决策矩阵,并进行规范化处理;在限寿件故障数据为小子样的情况下,运用熵权法,集成相关专家和工程人员的决策信息计算风险指标的熵权,并作为加权向量对规范决策矩阵进行修正;利用TOPSIS法进行评估。应用实例分析与计算,用正负理想解、欧氏距离和相对接近度等数据对5种故障模式进行模糊风险评估。结果表明,改进熵权TOPSIS的模糊风险评估方法可以实现评估对象的精确排序,比危害性矩阵作图法分析效率更高,能够为故障模式影响分析（FMEA）方法中制定预防措施和降低风险提供可靠依据。     

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.