一种新的敏捷虚拟企业合作伙伴选择与评价方法

针对敏捷虚拟企业合作伙伴选择和评价中出现的待选企业多、信息模糊性增加等新问题，以及传统层次分析法和其他模糊层次分析法在处理类似多方案问题中出现的判断矩阵不一致性等缺陷，将层次分析法、三角模糊数理论和其他基本模糊理论相结合，提出了一种合作伙伴选择和评价的新方法。该方法采用基于三角模糊数的层次分析法求取各层次指标的权重，采用模糊关系矩阵确定各待选企业的属性值，最后归并获得评价结果。在Matlab环境开发了基于该方法的具体应用系统，并进行了实例分析计算。     

隧道掘进机滚刀性能量化分级评估方法

隧道掘进机滚刀性能是制约掘进效率和施工安全的关键因素，为评价不同工况条件下的滚刀综合性能，通过层次分析法和模糊综合评价法研究了隧道掘进机滚刀性能量化分级评估问题。建立基于洛氏硬度、冲击韧性、承载能力和密封性能的因素集和评语集，划分滚刀性能评价等级；基于层次分析法构建不同工况滚刀性能参数权重，使用九级标度判断准则构造判断矩阵并通过一致性检验；建立各评价因素对评语集的梯形隶属度函数和三角形隶属度函数，选择七种滚刀构建其模糊评判矩阵；通过广义模糊合成算子计算模糊综合评价结果，基于综合得分对滚刀分级评价排序。结果表明：该方法可定性定量分级评判隧道掘进机滚刀性能优劣，为不同工况滚刀选择提供新思路。     

飞机数字化柔性装配工装评价模型构建及应用研究

为验证和保障各类飞机数字化柔性装配工装的综合实施效能,研究了柔性装配工装评价模型的构建方法及应用。建立评价指标集,规划了算法流程。采用AHP与模糊评价理论(F-AHP)结合,根据AHP建立判断矩阵并检验一致性,并提出了当判断矩阵不满足满意一致性时的改进算法,保证了层次单排序向量的科学性可用性。运用模糊理论求解决策矢量,根据最大隶属度原则得到综合评价结果。以某型飞机壁板组件预装配工装为例,验证了评价模型的可用性有效性。     

基于FAHP的产品质量综合评价算法的研究

产品质量的高低是决定企业竞争力强弱的主要因素之一,为了能客观地评价产品质量,在对层次分析法(AHP)及模糊层次分析法(FAHP)分析的基础上,利用FAHP的递阶层次结构,构建了产品质量综合评价模型;讨论了FAHP中模糊一致判断矩阵的性质,给出了模糊一致矩阵的简便构造方法,利用0.1-0.9标度对矩阵中的元素赋值;给出了矩阵一致性判断求解的方法并计算出相关的排序向量.实例分析证实了FAHP方法是可行的、有效的,FAHP方法比AHP方法更优越.     

基于实例和层次分析法的产品开发资源评价

针对产品开发过程中不同部门的资源评价问题,提出一种基于实例和层次分析法的产品开发资源评价方法。通过对设计资源的客观信息数据分析和资源价值指标的定义,构建基于实例信息扩散原理的客观评价模型。领域专家和项目负责人分别从资源价值性、资源稀缺性和不可替代性等不同角度给出资源比重的互补判断矩阵。综合上述评价结果构建三角模糊数互补判断矩阵,并对其模糊均值矩阵进行一致性修正和排序,实现并行产品开发过程中资源比重的分析。最后通过复杂机电系统设计实例验证该资源评价方法的可行性和有效性。     

基于模糊效用值排序的模糊层次分析法在机械运动方案优选中的应用

为了有效地对机械运动方案进行优选决策,在层次分析法的基础上,引入群决策方法和模糊效用值排序理论,提出一种基于三标度法的群体多准则模糊层次分析法。在多人决策情况下,首先利用简化的三标度法直接生成一致性的判断矩阵,在充分考虑决策者和决策对象不确定性的同时,将群体意见集成到三角模糊数中,最后通过模糊数总效用值排序获得各方案优先顺序。实例表明,该方法简化了分析过程,同时又综合了群体的意见,从而为机械运动方案优选提供了一种实用化方法。     

面向制造业的物流伙伴模糊优选模型研究

通过对物流企业评价体系的分析,针对中小型制造企业的物流特点,提出了一种面向物流子业务的合作伙伴模糊优选模型。该模型首先对子业务所要求的物流企业核心能力进行模糊聚类,在所有候选物流企业中初选出满足要求的物流伙伴,构成候选伙伴集合;然后在不完全信息条件下采用优属度排序的方法对候选集合进行模糊决策,选出最优物流合作伙伴。最后通过案例证明了该模糊优选模型的实用性。     

面向制造业的物流伙伴模糊优选模型研究

通过对物流企业评价体系的分析,针对中小型制造企业的物流特点,提出了一种面向物流子业务的合作伙伴模糊优选模型。该模型首先对子业务所要求的物流企业核心能力进行模糊聚类,在所有候选物流企业中初选出满足要求的物流伙伴,构成候选伙伴集合;然后在不完全信息条件下采用优属度排序的方法对候选集合进行模糊决策,选出最优物流合作伙伴。最后通过案例证明了该模糊优选模型的实用性。     

基于AHP的夹具定位元件选择方法

选择定位元件是夹具设计中的一项重要任务,直接影响工件相对于刀具的正确位置。为此提出一种基于层次分析法的定位元件选择算法。在综合分析定位元件的影响因素后,构造了定位元件选择因子的定量表达式。运用层次分析法建立了多方案的层次结构模型,并根据判断标度法与选择因子提出各层次中各因素判断矩阵的构造方法。根据判断矩阵的一致性检验,提出作为候选定位元件决策指标的组合权重确定方法。基于层次分析法的定位元件选择算法能够给出定位元件的选择排序,既为设计人员提供定量选择依据,也为计算机辅助夹具设计系统的开发提供技术支持。     

面向制造业的物流伙伴模糊优选模型研究

通过对物流企业评价体系的分析,针对中小型制造企业的物流特点,提出了一种面向物流子业务的合作伙伴模糊优选模型.该模型首先对子业务所要求的物流企业核心能力进行模糊聚类,在所有候选物流企业中初选出满足要求的物流伙伴,构成候选伙伴集合;然后在不完全信息条件下采用优属度排序的方法对候选集合进行模糊决策,选出最优物流合作伙伴.最后通过案例证明了该模糊优选模型的实用性.     

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...     

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。     

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.     

Limits of topographic measurement by the scanning tunnelling and atomic force microscopes

Parameters describing the topographic character of a surface (height, surface wavelength, slope and curvature) can be derived from equivalent sinusoidal profiles. The response of a surface-measuring instrument may be modelled in terms of instrument parameters such as stylus radius, and scanning range and resolution. The performance of the instrument may then be mapped as a zone in amplitude-wavelength (AW) space to show the sinusoidal profiles it is capable of measuring. In a first-order analysis the STM and AFM are considered as equivalent to contact-stylus instruments with a notional stylus radius equal to the tip radius plus the gap. Comparisons between different instruments and types of instrument are readily made by mapping in AW space. The error arising from convolution of the sinusoidal profile with that of the finite tip may be quantified and plotted as contours in AW space.     

Fractional order nonsingular terminal sliding mode control for flexible spacecraft attitude tracking

This paper investigates a fractional terminal sliding mode control for flexible spacecraft attitude tracking in the presence of inertia uncertainties and extern...     

奥氏体不锈钢表面双辉等离子渗锆的动力学

利用双辉等离子渗金属技术在0Cr18Ni9Ti奥氏体不锈钢表面制备了一层均匀、致密、呈良好冶金结合的渗锆合金层,并对1 060℃下的渗锆动力学进行了研究。结果表明:随着距锆合金层表面距离的增加,锆元素的含量呈梯度递减,扩散系数逐渐减小,而扩散激活能逐步增大;在1 060℃采用双辉等离子技术渗锆时,渗锆合金层表层的空位密度为2.945×(1012~1013)cm-2,与相同温度下采用常规渗金属工艺相比,提高了1~2个数量级。     

气化炉三维扫描测量与数据处理

以德士古气化炉耐火砖的内壁蚀损检测设备为基础,对采集到的点云数据做了进一步处理.通过对数据的筛选和剔除,实现了数据点的平滑降噪细化和精简.然后利用点云对整、网格划分和分色显示等方法,最终完成了内壁腐蚀情况的三维建模.重点讨论了点云数据的预处理及后处理的方法,并根据内壁耐火砖的腐蚀阈值,提出了一种气化炉内壁腐蚀区域的识别与分割方法.对耐火砖的腐蚀分析、气化炉的生产与维修提供了可靠依据,并在工程应用中获得了一致认可.