模糊环境下基于Vague集的虚拟企业伙伴选择研究

为解决模糊完工时间和交货期下的虚拟企业伙伴选择问题,提出一种基于Vague集的伙伴选择方法。在给出基于Vague集的交货时间满足度概念的基础上,建立了以极大化交货时间满足度指数为优化目标的虚拟企业伙伴选择模型,该模型考虑了交货时间满足度、成本和任务间的时序关系等因素。为解决标准粒子群优化算法容易陷入局部极值的问题,引入混沌搜索方法,设计了一种混沌粒子群优化算法进行模型求解。实例分析表明,混沌粒子群优化算法比标准粒子群优化算法具有更强的局部搜索能力。     

基于低碳的虚拟企业合作伙伴选择研究

为解决虚拟企业绿色合作伙伴的选择问题,提出了一种基于低碳的伙伴选择方法,建立了以极小化成本为优化目标的虚拟企业制造伙伴和运输伙伴集成选择模型.该模型考虑了制造和运输过程中的碳排放、交货期以及任务的时序等因素.为解决基本蝙蝠算法容易陷入局部极值的问题,设计了一种加入变异操作的改进蝙蝠算法来求解上述的伙伴选择模型.仿真结果表明了该方法的有效性.     

基于任务分解结构的虚拟企业伙伴优化选择

提出了基于WBS的虚拟企业伙伴优化选择模型，根据总体任务及其分解结构中各个子任务的特性来建立候选伙伴企业的评价指标体系，确定各个评价指标的权重。基于总体任务的分解结构建立虚拟企业伙伴选择的多目标决策模型，并在该模型中考虑到了各个子任务相对于总体任务的关键程度。采用一种自适应遗传算法对模型进行求解并通过一个实例验证了所提出模型和求解算法的有效性。     

基于灰色关联分析的虚拟企业伙伴选择系统

分析目前伙伴选择研究的情况,并给出灰色关联选择相对于其他算法的优点。根据虚拟企业的特征和内涵, 对虚拟企业灰色关联伙伴选择系统进行分析和设计,参考J2EE模式提出伙伴选择系统的总体框架体系,并利用 JSP+EJB+SQL Server实现系统的开发。着重论述灰色关联的数学模型、虚拟企业评价指标体系、虚拟企业灰色关联伙伴选择的核心算法及多层次灰色关联选择的实现过程。     

敏捷虚拟企业灰色关联伙伴选择系统的研究与实现

分析目前伙伴选择研究的情况，并给出灰色关联选择相对于其它算法的优点。根据敏捷虚拟企业的特征和内涵，对敏捷虚拟企业灰色关联伙伴选择系统进行了分析和设计，并给出了该系统的体系结构。着重论述了敏捷虚拟企业灰色关联伙伴选择的核心算法及多层次灰色关联选择的实现过程。     

支持扩展QoS约束的动态虚拟企业伙伴选择模型

现有Web服务架构为动态虚拟企业系统集成提供了良好的解决方案,但不能很好地支持扩展QoS(QoSextr)约束的动态虚拟企业伙伴选择。提出一种基于Web服务架构的动态虚拟企业伙伴选择扩展模型(DVEPSEM),对传统QoS进行了扩展,利用QoS监控系统对企业QoSextr进行实时监控和处理,同时发挥本体语义优势,建立企业服务分类集和领域本体间的映射,以提高企业服务发现的准确性和效率。基于DVEPSEM模型提出一种改进的自适应遗传伙伴选择算法(IAGA),实现QoSextr约束和大规模的动态虚拟企业伙伴选择。实验表明,IAGA算法能够较大程度地减少进化代数,提高伙伴选择的准确性。     

考虑决策者心理行为的虚拟企业伙伴选择方法

针对考虑决策者心理行为的虚拟企业伙伴选择问题,提出一种基于TODIM方法的合作伙伴选择方法,建立了以极大化各任务平均前景价值为优化目标的虚拟企业伙伴选择的数学模型,该模型考虑了决策者的参照依赖和损失规避行为。通过一个算例表明了该方法的有效性。     

虚拟企业合作伙伴选择方法研究

虚拟企业中的合作伙伴选择是虚拟企业组建过程中的一个关键问题。通过分析虚拟企业伙伴选择问题的特点,认为伙伴选择是一个具有模糊性主观判断的多目标决策问题。在建立合作伙伴综合评价指标体系的基础上,本文给出了伙伴选择的模型描述,并提出了改进的层次分析法（AHP）结合模糊理论的伙伴选择算法。最后,给出了一个典型算例,以说明该方法的有效性。     

协同产品创新联盟伙伴选择决策

选择合适、胜任的合作伙伴是提高协同产品创新绩效,确保协同产品创新工作取得成功的重要前提。基于伙伴个体属性和协同属性的视角,提出了一种考虑知识匹配度和协同创新整体收益的伙伴选择决策方法。构建了集成伙伴个体的知识匹配度、伙伴间的知识协作能力和联盟整体期望收益3大属性的综合指标体系;建立了基于综合指标体系的伙伴选择多目标优化模型,并采用带精英策略的快速非支配排序遗传算法求解该模型。通过实例分析,验证了该伙伴选择方法的可行性及实际应用价值。     

基于信任评审的虚拟企业伙伴选择

以模糊综合评价法为工具，提出了一种基于信任评审的虚拟企业伙伴选择方法。采用具有较强综合反映能力的信任度指标来进行虚拟企业伙伴选择，能解决虚拟企业运行中的合作相容性和稳定性问题。将该方法应用到实例中得到了一个伙伴选择排序表，与企业的实际运作较吻合。     

三绕组变压器的双绕组等效建模及在Matpower中的应用

针对实际电网存在着大量的三绕组变压器,但国际上一些著名商业软件,如BPA仿真软件、Matpower这一权威潮流计算开源软件,均只提供双绕组变压器模型,限制了其在具有三绕组变压器的电力系统中的应用的问题,潮流计算是自主开发的电力系统各种应用软件的核心模块,因此依托国际权威开源程序进行二次开发,是一种较好的选择。对Matpower要求的数据格式进行了归纳,对变压器的一般的等值电路及带理想变压器的等值电路和带标幺值的等值电路进行了分析研究,提出了三绕组变压器转换为双绕组等效模型的建模方法,使得原先只适应双绕组变压器的潮流计算软件可以适用于三绕组变压器电网的潮流计算;最后以Matpower软件为例进行了案例计算,并用PSASP仿真软件进行对比验证。研究结果证明,所提出的建模方法是有效的。     

On the Relation of Load to Average Gap in the Contact Between Surfaces with Longitudinal Roughness

A computer simulation model for the contact between longitudinally-oriented rough surfaces has been formulated. This model closely duplicates the actual surf ace contact deformation behavior by taking into account the elastic interactions between the asperities. There were no assumptions made about the shapes, or any deformation behavior of the asperities, except for their obeying the laws of elasticity. The plastic deformations on the high asperity peaks were taken into account by setting a ceiling on their contact pressures at the material hardness value. The simulations used real surface profiles which were digitized from unworn circumferentially ground steel surfaces. Each pair of these profiles was mathematically combined to form an equivalent rough profile pressing against an infinitely rigid flat and having the appropriately adjusted elastic modulus. A total of 28 different pairs of profiles were used in the simulations. Each contacting pair was subjected to 30 different load levels and the local contact pressures and deformations were calculated. The contact simulations yielded some important mathematical relationships between parameters, such as the real area of contact, average gap, and average asperity load through statistical curve fitting. Two analytical functions were generated to relate the average load to average gap and the real area of contact to load.     

电站锅炉模糊风险评价方法研究与应用

针对电站锅炉风险等级评价问题,将模糊综合评价技术应用到电站锅炉风险等级评价中。开展了电站锅炉失效影响因素及模糊评价因素的重要程度分析,建立了一套科学合理适于在线评价的电站锅炉风险评价体系,提出了模糊综合评价技术与改进的模糊层次分析法相结合的模糊风险评价方法,利用改进的模糊层次分析法计算了指标体系中各层指标权重。对某一台电站锅炉的实际运行工况影响子因素进行了模糊风险评价,采用模糊合成算子进行模糊综合运算得到电了站锅炉运行工况影响子因素的评价向量。研究结果表明:电站锅炉的运行工况影响子因素的风险评价等级为第6级,失效可能性等级为小,该电站锅炉运行工况良好。     

交通荷载作用下桥梁结构参数识别方法

应用动力节点加载法,将作用在桥梁上的交通荷载转化为等效节点荷载,再用两步构造法识别结构物理参数.第1步,用Newmark-β方法变换结构运动方程,并用结构的加速度响应求得变换空间内的位移、速度和加速度响应;第2步,基于最小二乘原理,构造出变换空间内求解结构参数的递推式,进行结构物理参数识别.数值模拟结果表明,在交通荷载作用下,该方法能够快速、准确地进行桥梁结构参数识别.     

RLS and LMS blind adaptive multi-user detection method and comparison in acoustic communication

RLS and LMS blind adaptive multi-user detection algorithm and multi-user detector was proposed to solve the problem of multi-user signal detection problem encountered in underwater acoustic communication networks.In simulation analysis,RLS and the LMS blind adaptive multi-user detector were designed and tested for synchronous and asynchronous multi-user communication process.The results of SIR comparison and MMSE comparison show that,both of the two methods can realize blind adaptive detection when any user change in multi-user communication,during this process,the training communication sequences are not needed.The RLS algorithm has about 5 dB higher in SIR compared with LMS algorithm,and the convergence velocity of RLS algorithm is also higher than LMS algorithm when the communication users change.RLS algorithm has better ability in multi-user detection than that of LMS algorithm,and it has great attraction and guiding significance for solving the problem of multiple access interference(MAI) in multi-user communication.     

Robust Impedance Control of Robots Using an Adaptive Interaction Force Observer

For robot interaction control,the interaction force between the robot and the manipulated object or environment should be monitored.Impedance control is a type ...     

Research on key techniques of expendable conductivity temperature depth measuring system

This paper analysis the developing of expendable conductivity temperature depth measuring system(XCTD)and introduce its principle of measuring about temperature,salinity and depth of ocean.Some key techniques are put forward.According to the real needs of XCTD,conductivity sensor with high sensitivity is designed by principle of electromagnetic induce,the ocean conductivity from induced electromotive force has been calculated.Adding temperature correction circuit would help to reduce error of conductivity measurement because of sharply changing temperature.Advanced temperature measuring circuit of high precision and the constant current source is used to weaken effect of self-heating of resistance and fluctuation of the source.On respect of remote data transmission,LVDS is a good choice for the purpose of guarantee the quality of data transmitted and the transmission distance is reaching to thousand meters in the seawater.Modular programming method is also brought into this research aimed at improve the stability,reliability and maintainability of the whole measuring system.In February,2015,the trials in South China Sea demonstrate that the developed XCTD realize effective measurement at a speed of 6 knots and detection depth at 800 m.The consistency coefficient of the acquired data is greater than 0.99 and the success rate of probe launching is above 90%.     

CHARACTERISTCS OF FLUID FILM IN OPTIMIZED SPIRAL GROOVE MECHANICAL SEAL

In order to investigate the sealing performance variation resulted from the thermal deformation of the end faces, the equations to calculate the fluid film pressure distribution, the bearing force and the leakage rate are derived, for the fluid film both in parallel gap and in wedgy gap. The geometrical parameters of the sealing members are optimized by means of heat transfer analysis and complex method. The analysis results indicate that the shallow spiral grooves can generate hydrodynamic pressure while the rotating ring rotates and the bearing force of the fluid film in spiral groove end faces is much larger than that in the flat end faces. The deformation increases the bearing force of the fluid film in flat end faces, but it decreases the hydrodynamic pressure of the fluid film in spiral groove end faces. The gap dimensions which determine the characteristics of the fluid film is obtained by coupling analysis of the frictional heat and the thermal deformation in consideration of the equilibrium condition of the bearing force and the closing force. For different gap dimensions, the relationship between the closing force and the leakage rate is also investigated, based on which the leakage rate can be controlled by adjusting the closing force.     

Quantum Cooperative Robotics and Autonomy

The intersection of Quantum Technologies and Robotics Autonomy is explored in the present paper.The two areas are brought together in establishing an interdisci...     

OPTIMIZATION METHOD ON IMPELLER MERIDIONAL CONTOUR AND 3D BLADE

An optimization method for 3D blade and meridional contour of centrifugal or mixed-flow impeller based on the 3D viscous computational fluid dynamics (CFD) analysis is proposed. The blade is indirectly parameterized using the angular momentum and calculated by inverse design method. The design variables are separated into two categories: the meridional contour design variables and the blade design variables. Firstly, only the blade is optimized using genetic algorithm with the meridional contour remained constant. The artificial neural network (ANN) techniques with the training sample data schemed according to design of experiment theory are adopted to construct the response relation between the blade design variables and the impeller performance. Then, based on the ANN approximated relation between the meridional contour design variables and impeller performance, the meridional contour is optimized. Fewer design variables and less calculation effort is required in this method that may be widely used in the optimization of three-dimension impellers. An optimized impeller in a mixed-flow pump, where the head and the efficiency are enhanced by 12.9% and 4.5% respectively, confirms the validity of this newly proposed method.