基于MCGS和PLC的化肥自动配料称重控制系统

介绍化肥自动配料称重控制系统的设计过程,重点阐述上位机组态监控界面和PLC程序设计,以提高化肥生产效率和质量。     

A systematic data-mining-based methodology for product family design and product configuration

Product family design and product configuration based on data mining technology is identified as an intelligent and automated means to improve the efficiency of product development. However, few of previous literatures have proposed systematic product family design method based on data mining technology. To make up for this deficiency, this research put forward a systematic data-mining-based method for product family design and product configuration. First, the customer requirement information and product engineering information in the historical order are formatted into structural data. Second, principal component analysis is performed on historical orders to extract the customers' differentiated needs. Third, association rule algorithm is introduced to mine the rules between differentiated needs and module instances in the historical orders, thus obtained the configuration knowledge between customer needs and product engineer. Forth, the mined rules are used to construct association rule-based classifier (CBA) that is employed to sort out the best product configuration schemes as popular product variants. Fifth, sequence alignment technique is employed to identify modules for popular product variants, so that the module instances are divided into optional, common and special module, respectively, thereby the product platform is generated based on common modules. Finally, according to new customer needs, the CBA classifier is used to recommend the best configuration schemes, and then popular product variants are configured based on the product platform. The feasibility of the proposed method is demonstrated by the product family design example of desktop computer hosts.     

一种面向水下传感器网络的监测系统设计方法

当前水下监测系统缺乏统一的开发规范,软件可复用性低,难以快速、高效地进行系统设计与实现;提出了基于水下传感器网络的监测系统设计方法,将系统结构分为观测平台、本地观测服务器、数据服务器,从数据获取、数据管理、数据展示方面给出了软件的总体开发流程,并提出了统一的软件数据模型和软件开发模型;在数据模型中,对监测元数据以及监测数据进行规范化描述;在软件开发模型中,构建了可扩展的功能组件库,通过对组件进行配置,可快速生成满足用户需求的监测系统;通过在不同的应用开发中进行验证,证明该方法能够在保证系统质量的前提下,显著提高开发效率.     

Performance Comparison of Long-Wave Infrared Imaging Spectrometer Between Dyson Form and Offner Form

In view of the difficulties in traditional long-wave infrared imaging spectrometer which is hard to realize a high signal-to-noise ratio and miniaturization as well under the weak remote sensing signal,Offner convex grating spectrometer and Dyson concave grating spectrometer,both having concentric structure,are designed and analyzed in the band of 8-12 μm. The diffraction angle expressions of the two spectrometers are obtained and the diffraction characteristics are acquired. Both of the spectrometers are designed in Zemax environment under different F-numbers and different grating constants with the same slit,spatial resolution,spectral resolution and detector. The results show that Dyson grating spectrometer possesses the advantages of higher throughput and smaller volume, and Offner grating spectrometer possesses the advantage of more accessible material and the absence of chromatic aberration. The differences between Dyson form and Offner form show that the former is a better choice in the long-wave infrared imaging spectrometer.     

A Cluster-Based Virtual Cooperative MIMO Transmission Scheme

基于分簇的虚拟协作MIMO传输策略研究

吕红芳

（上海电机学院 电气学院）

中文摘要：

无线传感器网络应用于环境状态监测时,最关键的问题是在无线通信时保障数据传输的可靠性、降低全网的能量消耗。本文提出了一种基于分簇的虚拟协作MIMO传输策略（CVCM）,该方案根据簇头节点到汇聚节点的距离动态配置最佳的协作节点数目和调制速率,保证每个虚拟MIMO单元和汇聚节点的通信能耗最小,从而降低整个网络的能力消耗。仿真实验结果表明,CVCM有效地降低了网络能耗,延长了网络的生命周期,提高了基站接收数据的有效性。

关键词：分簇;虚拟协作MIMO;动态配置;调制速率

     

基于单片机和组态软件的电子节气门控制系统

针对电子节气门的控制,以ATMEG16L单片机为核心,设计了电子节气门控制系统,并通过MCGS组态软件与单片机之间的通信,显示控制结果。实验表明利用单片机完成的控制系统可以满足控制要求。     

基于约束满足和贝叶斯网络的大规模定制产品配置方法

针对在产品配置过程中忽略了用户兴趣这一不足,提出了一种基于约束满足问题(constraint satisfaction problem,CSP)与贝叶斯网络(Bayesian network,BN)二者结合的产品配置方法.在CSP与BN的理论基础上,建立了基于CSP与BN的配置模型,给出了求解的具体方法.最后以组装电脑为例,开发了组装电脑产品的配置系统,该系统验证了这种配置方法能对配置结果进行优化,具有一定的可行性和有效性.     

竖直地埋管换热器多个钻孔地层热阻计算方法

为解决国家规范中关于多个钻孔热干扰下的地层热阻计算问题,针对竖直地埋管换热器系统,提出了矩形阵列钻孔布置中不同参考钻孔下的地层热阻数值计算方法,并通过算例模拟分析研究了不同钻孔布置形式以及不同钻孔间距情况下的地层热阻分布.结果表明:规则矩形阵列钻孔布置的中心位置地层热阻最大,且布置形式越趋近正方形,钻孔间距越小,地层热阻越大;而不规则矩形阵列钻孔布置的最大地层热阻位置会根据未布置钻孔点位发生相对偏移,但偏移量可忽略.研究成果可为竖直地埋管换热器设计提供理论参考.     

触摸屏Smart1000在低压真空馈电开关智能综合保护器上的应用

针对低压真空馈电开关智能综合保护器人机界面的功能及实际工程需求,分析了西门子触摸屏Smart1000的应用特点,并设计了应用接口电路,在此基础上,阐述了触摸屏Smart1000应用方法。通过实际工程验证了西门子触摸屏Smart1000能够提供友好的人机界面,完全满足现场实际需要。     

基于PROFIBBUS—DP的双向拉伸塑料薄膜控制系统的设计

基于PROFIBBUS—DP的双向拉膜生产线控制系统主要完成：基于现场总线上位机、触摸屏、PLC控制系统的软硬件设计;在张力、温度、压力控制系统中采用了数字PID的控制方案,在MATLAB中进行了仿真验证;完成了系统硬件组态和网络组态,并进行了系统的调试和试运行,基本满足生产要求。