一种计及光伏发电功率不确定性的实时调度方法

大规模光伏发电注入电力系统,其功率的不确定性给实时调度带来了挑战,进而对光伏发电功率和负荷预测的精度提出了更高的要求。针对此问题,文章提出一种计及光伏发电功率不确定性的实时调度方法。首先,基于实时调度的有效稳态安全区域法和线性潮流模型,提出一种计及电压幅值的实时调度模型;其次,通过鲁棒优化等方式将原问题转化为确定性的线性规划问题求解;然后,根据所提方法,分析光伏发电功率和负荷预测精度对于电力系统实时调度安全性和经济性的影响;最后,通过改进IEEE 9节点系统和IEEE 118节点系统进行算例分析,说明所提方法的有效性和高效性。     

机器视觉实时问题的对策与研究方法综述

机器视觉已经广泛应用在许多行业,由于图像处理的数据是海量的,处理图像的速度一般比较慢,但一些领域要求开发的机器视觉系统是实时的.为此,本文针对实时问题,从硬软件与算法几个方面,沿着机器视觉过程的每个环节,对相关的对策与研究方法作了阐述与总结.最后指出实时性不仅仅是一个机器视觉系统所考虑的一个方面,往往还应兼顾其它性能.     

流程工业CIMS中ActiveX/DCOM技术的应用

本文针对流程工业中进行远程实时监控的现实意义，设计了基于ActiveX／DCOM的远程实时监控系统。在整个监控系统的整体设计上，采用了DCOM分布式对象技术作为系统的基本构架，以实时数据库组件为核心．在现场数据通信问题上采用OPC规范．并且使用Web浏览器作为客户端应用程序。通过在浏览器插入ActiveX控件实现各种操作。     

钢铁企业先进生产计划和实时生产调度技术的研究

为了解决钢铁企业目前由于缺乏生产计划和调度系统而造成的宏观调控和实时监控等方面存在的问题，在对现有钢铁企业的信息化体系结构和生产管理模式等进行理论研究的基础上，提出了基于MRP II与JIT相结合的特钢行业生产管理模式；采用多层递阶计划和动态实时调度策略，构建面向企业上层管理ERP和下层执行MES系统的集成化解决方案。实现了企业生产计划和调度的整体优化，建立了适合特钢企业经营管理与生产制造一体化的信息系统。     

JJS1型翻斗雨量传感器校准仪

叙述了JJS1型翻斗雨量传感器校准仪的研制、开发及解决的主要技术问题，找出了校准过程中的误差来源，分析并给出了现场校准和测试的可行性及理论依据。     

一种非周期软实时系统的动态调度方法

本文介绍了一种针对非周期软实时系统的动态调度方法。该方法以DM调度算法为基本调度算法，把非周期软实时系统看作一个多优先级排队系统，根据不同优先级的任务的队列长度来动态调整系统的参数。该方法能在统计意义上确保系统的实时性，同时又能兼顾系统的QoS需求。实例表明该方法能提高系统的实际利用率和降低系统的时限错过率，是一种有效的载荷管理方法。     

Kinematic calibration for a hybrid 5DOF manipulator based on 3-RPS in-actuated parallel manipulator

The measurement method is a decisive step for any calibration method. This paper studies the practical performance of a 5DOF manipulator based on a 3-RPS parallel mechanism. By comparing the controlling data that resides in parallel part and serial part at different orientations, a calibration method has been put forward and proved to be applicable. The precision of the calibrated model mainly depends on the number of measurements carried out. The distribution of measurement points also affects the precision and the measurement number could be significantly reduced if uniform distribution were ensured.     

工业机器人控制系统的开放性与实时性研究

针对工业机器人系统对开放性和实时性能的需求,从硬件和软件两方面详细讨论机器人控制器在开放性和实时性上的要求以及目前的研究进展,并从这两方面构建了基于ARM7微处理器运动控制板的SCARA机器人的控制系统,充分利用嵌入式技术、CAN总线技术、SoC技术等多项技术,同时将RTAI(Real Time Application Interface)和uClinux相结合组成双核嵌入式实时系统,保证系统具有较强的开放性和硬实时性,最后通过实验验证了系统的可行性和较好的实时性能.     

Methane calibration burner and C‐factor determination with cone calorimeter – validation of the standardized calibration protocol

The cone calorimeter is one of the major fire tests. In its reference standard ISO 5660‐1, the apparatus (and especially a characteristic of its orifice plate mass flow meter, called C‐Factor) is calibrated using a methane burner set at 5 kW. However, measurements performed in end‐use are in the range 1–10 kW. In addition, standard proposes to check linearity at 1 and 3 kW, which means in the lowest part of the range. This communication establishes the validation of the linearity on the whole range and determines the optimal condition for C‐factor determination. It justifies the technical choices of the standard. Copyright © 2014 John Wiley & Sons, Ltd.     

Strategies to realize decentralized manufacture through hybrid manufacturing platforms

Centralized factory dominance has led to optimization and set-up for manufacture of a sole product or product-range. In-house efficacy of such systems has been greatly improved due to lean six-sigma methodologies; however, wider scale distribution and supply has undergone little to no transformation over the past century. Research pertaining to distributed manufacture, cloud-manufacture and reconfigurable systems have provided several decentralized models using traditional manufacturing capabilities. Due to practical limitations they have not been fully realized to date. This paper outlines the emerging concept and scope for hybrid manufacturing platforms – systems using a plurality of processes on a single motion platform, to manufacture products in a decentralized network. Necessity of on-machine inspection is highlighted, outlining the potential of generic artifact machine calibration and verification of parts made. A robust experimental method using a novel hybrid manufacturing approach is used to realize the post-process adaptation of subsequent parts and demonstrates significant improvement with adapted features being cut within 15 μm of nominal position, compared to the original 300 μm error. Social, economic and environmental ramifications of adopting such a system are highlighted. The combination of several key processes will allow users to manufacture parts with minimal intervention. A move to personal fabrication would allow greater customization and convenience for the end user; however, the issues of copyright and loss of economy of scale would inhibit mass uptake in the near-future. Growing interest by enthusiasts and early adopters will continue to make an impact on the way the populace views manufacture.