面向产品配置的模块形成及划分方法

产品配置要考虑客户需求、模块组合复杂度、设计复杂度和成本,合理模块划分是产品配置基础。通过分析客户需求和零部件各相关性因素,建立零部件模糊相似性矩阵,并构建零部件模糊聚类树,描述模块的形成过程。提出采用复合λ对模糊聚类树截距,以组合复杂度、设计复杂度和成本为优化目标进行模块划分。利用遗传算法进行模块划分的优化,得到各λ值,进而得到模块划分的优化结果。此方法不仅考虑零部件之间相关的紧密程度,而且考虑模块划分的目的,以某天文圆顶为例说明了该方法的可行性和适用性。

前视声纳中多波束形成算法的FPGA实现

在阵元数量和波束数量较多的情况下,多波束形成算法对FPGA的计算资源以及数据传输能力要求极高。文中使用Xilinx公司的Kintex-7系列FPGA对96通道、256波束的二维前视声纳中正交多波束形成算法进行研究。针对正交多波束形成算法资源消耗过大的问题,整体算法采用12个子模块并行逐级求和的方法实现,该方法可对算法结构进行显著优化,每个子模块结构包括数字正交混频、低通滤波抽取和多波束形成三个部分。子模块工作的最高频率为128 MHz,故提出通过8通道复用的方法实现数字正交混频和滤波抽取,通过乒乓存储操作以及2048倍复用复数乘法器实现多波束形成;再将三个算法子单元串行处理,实现数据不间断输出,从而解决传统全并行多波束形成算法导致FPGA资源消耗严重以及不足的问题。最后,通过Matlab仿真和标准信号源测试验证所提方案的可行性。

产品模块化设计方法的研究

产品模块化设计方法作为一种新的现代设计方法,它主要是通过综合考虑零部件之间存在的功能相关性、几何相关性和物理相关性等建立产品的原始矩阵,然后应用模糊数学中的模糊聚类分析方法对其划分,并且按不同水平的阈值得到一个动态聚类树,最后根据需求形成模块.以二级圆锥齿轮减速器为例,阐述了该方法的应用.

职业技能鉴定试题库系统的设计与实现

传统的职业技能鉴定工作采用专业教师集中出试卷的落后方式,为了适应鉴定工作日益增长的需要,必须采用计算机管理。为此,本文提出了一种职业技能鉴定试题库系统的设计方法。该方法利用OLE技术,将Microsoft Word集成到软件中,方便了试题和试卷的维护。另外,在安全方面也进行了全面考虑。

Improved CFD modeling of full dissolution of alumina particles in aluminum electrolysis cells considering agglomerate formation

The full alumina dissolution process in aluminum electrolysis cells was investigated using an improved computational fluid dynamics(CFD)model based on the previous researches by consideration of agglomerate formation.The results show that the total mass of alumina agglomerate and its maximum size are mainly dependent on the feeding amount and increase with increasing it.Higher superheat can effectively inhibit the agglomerate formation and thus promote the full alumina dissolution behavior.The full alumina dissolution process mainly includes a fast stage and a slow stage,with an average dissolution rate of 17.24 kg/min and 1.53 kg/min,respectively.About 50%(mass percentage)of the total alumina particles,almost all of which are the well-dispersed alumina fine grains,dissolve within the fast dissolution stage of about 10 s.The maximum values of the average dissolution rate and final percentage of the cumulative dissolved alumina mass are obtained with a feeding amount of 1.8 kg for a superheat of 12℃.The formation of the alumina agglomerates and slow dissolution characteristics play a dominant role in the full dissolution of alumina particles.

宽带CDMA信道中的智能天线测试平台的设计与分析

在宽带CDMA WLL的环境中,使用波束形成模块(BFM)设计智能天线系统,并分析了其性能。波束形成模块是由DSP(TMS320C6701)电板实现的。首先,给出计算机仿真的结果,这些结果通过由基带信号处理设备组成的测试平台系统产生的模拟接收(RX)信号获得,包括模拟接收(RX)信号生成的PC、计算最优化加权矢量的BFM及接口模块。然后,用基站测试平台系统去评估实际信号的自适应波束形成功能。测试平台包括多用户、RF模块,以及其他相关设备。

浅谈中职ESP课程“三定一变”的教学评价模式——以汽车维修专业为例

恰当的教学评价对学生的学和教师的教都会起到重要的影响和指导作用。现实表明,缺少恰当的教学评价模式是造成中职教师不愿意教,学生不愿意学ESP(English for special purpose)课程的主要原因之一。笔者在教授汽车英语的过程中开展了试图将过程评价纳入课程评价的实践。本文主要从形成性模块评价和终结性评价方面探讨中职ESP课程评价的实施策略。

Docking process on hybrid self-reconfigurable modular robots

A novel hybrid self-reconfigurable modular robot is designed to finish the morphing action from line shape to hexagon shape. The robot is composed of many basic modules,each of which consists of a master module and a slave module in the shape of triangular prism. There are four connection ports on each basic module. For the master module there are two holes on each connection port,and for the slave one there are two pegs on each connection. The docking process between two neighboring basic modules is analyzed with a peg-in-hole mechanical structure. A small motion's method is presented and the contact forces are derived. According to the force/moment,the pose of a motion module should be adjusted to make two neighboring modules align and finish the docking process.Finally,a simulation of 3 basic modules is shown to finish the morphing and docking process effectively. The system can finish the morphing task from the line shape to the hexagon shape.

A STUDY ON FORMAL MODEL INTEGRATION

Model integration is an important section of the model management research area. The paper puts forward a formalization representation of model, and presents some concepts, such as the compound model re- lation, the composite model and so on. Additionally, the existence of model integration is also analyzed in de- tail and several sufficient conditions are proved.

The Elements in Crystal Bases Corresponding to Exceptional Modules

According to the Ringel-Green theorem,the generic composition algebra of the Hall algebra provides a realization of the positive part of the quantum group.Furthermore,its Drinfeld double can be identified with the whole quantum group,in which the BGP-reflection functors coincide with Lusztig's symmetries.It is first asserted that the elements corresponding to exceptional modules lie in the integral generic composition algebra,hence in the integral form of the quantum group.Then it is proved that these elements lie in the crystal basis up to a sign.Eventually,it is shown that the sign can be removed by the geometric method.The results hold for any type of Cartan datum.