基于分辨力空间变化的自动聚焦方法

在获取数字化图象的过程中,快速、有效地实现自动聚焦十分重要。提出一种加快对焦判断的方法,模仿人眼视觉系统中视网膜的空间变化分辨力,建立了模拟模型并进行了数据分析。实验表明,利用所提出的模型,在保持高分辨力的同时又有一个大视场和较少的数据处理量,在保证了为精度的同时又提出了原有的处理速度,在对焦策略上有一定的先进性,在机器人视觉系统和数字成象系统中具有很好的应用前景。     

基于Web的分布式文档管理系统的设计与实现

企业和政府机构的分布式特征对文档管理提出了新的要求,传统的文档管理系统已经不能满足分布式应用需求。本文结合Web Services技术、工作流技术、版本控制技术和数据库技术,设计并实现了基于Web的分布式文档管理系统。本文工作已经在某政府机构的电子政务建设中得到了具体的实现与应用。     

基于CAX的产品族建模及变型设计系统研究

提出了基于CAX的支持交型设计的产品族模型,该模型包含对象模型、业务模型和CAX文档,通过建立产品的事物特性表与业务参数表的联系,实现对产品快速变型设计。开发了基于CAX的产品族建模及变型设计系统,详细介绍了产品族建模和模型管理两个功能模块。     

中小型金属工件在线检测系统的设计

随着机器视觉技术的快速发展,利用图像处理技术对工件进行在线实时检测的方法近年来得到广泛的应用和发展。为了解决工件离线人工检测效率低、精度差的问题,设计了包括上料模块、图像采集处理模块、零件传送模块、筛选模块和控制模块的基于机器视觉的工件在线检测剔除系统。系统运用PLC可编程逻辑控制器作为工业控制器,机器视觉和图像处理作为检测方法,提高了工件检测的产品品质、生产效率和自动化程度,该机器视觉检测系统可以通过改变程序的方法,运用和推广到其他表面品质检测的行业中。     

基于GIS坐标布局的配电单线图自动成图技术

以IEC 61968的公共信息模型(CIM)为基础,对配电网设备信息及拓扑连接关系进行解析。先通过四参数法将设备地理信息系统(GIS)坐标映射到网格化的图纸上完成初始布局,再针对"杆塔分布均匀规整、站房分布均匀、线路交叉少、整体图元分布均匀"的优化目标进行多目标优化建模,利用带线性递减策略的柯西变异粒子群算法进行优化布局,实现了兼顾灵活通用与布局美观的配电单线图自动成图,并生成可缩放矢量图形(SVG)格式文件与专网移动设备共享,以满足配电网运检业务的需要。     

Effect of beta-lactoglobulin A and B whey protein variants on the rennet-induced gelation of skim milk gels in a model reconstituted skim milk system

The effect of fortifying reconstituted skim milk with increasing levels of the β-lactoglobulin (β-LG) genetic variants A, B, and an A-B mixture on rennet-induced gelation was studied by small deformation-sensitive rheology. Free-zone capillary electrophoresis and high-sensitivity oscillatory rheology were used to elucidate the role of potential heterotypic associative interactions between whey proteins and casein in a mixed colloidal system, subjected to moderate heating (65°C for 30 min) prior to renneting, on the gelling properties of the system. Increasing levels of added whey protein, in the concentration range of 0.225 to 1.35% of added protein, led to a concomitant progressive increase in the equilibrium shear storage modulus, G′ (recorded after ∼10,800 s), in the order β-LG B > β-LG A and β-LG A-B, as the general expected consequence of the setup of denser casein gel networks. The preferential effect of β-LG B over β-LG A on the mechanical strength of the gels may be due to the formation of cross-links and aggregates involving whey proteins and rennet hydrolysis products or an increase in the size of the casein micelle caused by the grafting of β-LG B to its surface, or both. The results of free-zone capillary electrophoresis were consistent with the notion that β-LG B (and not β-LG A) binds to the casein micelle under an optimal stoichiometry of 1:0.045 (mg/mg), even in the absence of heat treatment. The liquid-like character of the gel networks formed, tan δ, was a parameter sensitive to the level of addition of β-LG A in particular. At low concentrations (up to 0.45%) of β-LG A, tan δ increased by almost twice as much, which was interpreted as a result of the increase in the loss modulus, G″, of the sol fraction because of the presence of unbound β-LG A. At greater incremental concentrations of β-LG (>0.45%), the formation of smaller whey protein aggregates confined to the sol fraction may have led to a progressive decrease in tan δ. The critical gel time, t_gel, was also affected by the concentration of added whey protein and described 3 zones of behavior, irrespective of the type of whey protein variant. The critical gel time was slightly shorter for β-LG B than for β-LG A at 0.45% of added whey protein, but this difference became larger at 0.67%. Even when only β-LG B was found to associate with casein prior to renneting, both β-LG A and β-LG B, either alone or mixed, had a profound influence on the mechanical strength and coagulation kinetics of the rennet-induced casein gels. This knowledge is expected to be useful to exert better control and optimize processing conditions during the manufacturing of cheese and cheese analogs.     

多孔质气体止推轴承跨缝过程时变特性研究

针对某大型超平气浮支撑平台上卫星模拟器所使用的多孔质气体止推轴承,在跨越气浮平台的拼缝过程中存在的运动卡滞和自激振动问题,建立多孔质轴承气体润滑理论模型,考察气体轴承的稳态特性;使用有限元法分析多孔质气体轴承通过拼缝时的动态时变特性,并分析压力分布、承载能力、倾覆力矩的变化。结果表明:平台拼缝间隙的存在对多孔质气体止推轴承压力分布造成了较大的影响,导致跨缝过程中其承载能力大幅降低,从而造成轴承表面划伤,因此在轴承的设计选用中应留有较多的承载余量;多孔质气体止推轴承在跨峰过程中,在其运动方向上存在呈正弦波动的倾覆力矩,但对其正常使用不会造成影响。     

基于通用物料清单的配置设计方法研究与实现

为了在配置设计中更好地支持通用机械产品研发中的创新,采用通用物料清单来表达产品族的完全产品结构,并引入类单元表示可以变化的模块.由配置类单元产生组合变型,用变型类单元处理单元自身变型,并分析了这两种变型的产生机理.基于变量配置技术建立通用物料清单的配置模型,通过分层配置,生成具体产品结构,应用装配克隆技术生成具体产品的通用物料清单,最后给出了配置设计过程和实现结果.通过在企业的应用表明,该配置设计方法可以实现基于订单的快速设计.     

软件配置管理的多级实现

本文介绍了软件配置管理的相关内容，并提出了一种软件配置管理的多级实现方法，该方法在实际应用中取得了良好的效果。     

Iterative Learning Control Algorithm with a Fixed Step

Iterative Learning Control (ILC) captures interests of many scholars because of its capability of high precision control implement without identifying plant mathematical models, and it is widely applied in control engineering. Presently, most ILC algorithms still follow the original ideas of ARIMOTO, in which the iterative-learning-rate is composed by the control error with its derivative and integral values. This kind of algorithms will result in inevitable problems such as huge computation, big storage capacity for algorithm data, and also weak robust. In order to resolve these problems, an improved iterative learning control algorithm with fixed step is proposed here which breaks the primary thought of ARIMOTO. In this algorithm, the control step is set only according to the value of the control error, which could enormously reduce the computation and storage size demanded, also improve the robust of the algorithm by not using the differential coefficient of the iterative learning error. In this paper, the convergence conditions of this proposed fixed step iterative learning algorithm is theoretically analyzed and testified. Then the algorithm is tested through simulation researches on a time-variant object with randomly set disturbance through calculation of step threshold value, algorithm robustness testing,and evaluation of the relation between convergence speed and step size. Finally the algorithm is validated on a valve-serving-cylinder system of a joint robot with time-variant parameters. Experiment results demonstrate the stability of the algorithm and also the relationship between step value and convergence rate. Both simulation and experiment testify the feasibility and validity of the new algorithm proposed here. And it is worth to noticing that this algorithm is simple but with strong robust after improvements, which provides new ideas to the research of iterative learning control algorithms.