Epoxy paint failure in B-52 fuel tanks: Part II. Influence of DIEGME concentration in the fuel on the failure process

A model has been proposed to explain the failure of the original BMS10-39 epoxy paint on upper vertical surfaces in B-52 fuel tanks. The model involves interaction of the paint with DIEGME, a fuel system ice inhibitor (FSII) in jet fuel, that is distilled from the liquid fuel. In this communication, distillation experiments used to support the model are refined to better match the mass transfer of vapor from fuel in a B-52 fuel tank at close to room temperature. The interaction of these lower temperature distillates with the paint affirms the earlier model. On the basis of these experiments it is proposed that paint failure may be controlled or eliminated by reducing the level of DIEGME in the fuel. Proposed changes in military jet fuel composition are detailed.     

一种汽车动力电池模拟负载电路设计方案

为解决BMS系统中涉及电池平衡相关功能的软硬件开发、测试、生产等对电池负载的需求,介绍了一套电路设计方案,来模拟真实的电池电特性。此系统包括电池单体模拟电路、电容充放电电路、电容电压监控电路、Pack模拟电路等电路模块。同时,负载电路还有拼接功能,满足不同规模大小的测试需求,其控制接口采用CAN总线,具备控制简单,便于集成的特点。模拟负载拥有真实负载所不具备的诸多优点,如一致性好,可重复性高,状态改变快,使用寿命长,模拟工况丰富等,因此它是BMS开发工程师的必备工具,对推动BMS系统研发有积极的意义。     

广钢二期电站锅炉燃烧管理控制系统的技术改造

锅炉燃烧管理控制系统是用于发电厂锅炉燃烧运行的安全监控及保护装置。通过对二期电站BMS系统的技术改造,采用PC-PLC组合替代原来的BMS系统,并对系统程序进行优化,提高了BMS系统工作的可靠性、诊断能力、抗干扰能力和稳定性,能锁定锅炉和重要设备的首发原因。在类似锅炉控制系统改造中有推广价值。     

妈湾发电总厂BMS逻辑优化

针对妈湾发电总厂一期工程 2× 30 0 MW机组配套的锅炉燃烧器管理系统存在的不合理进行了优化 ;介绍了原系统的硬件构成、存在的问题、对原系统的优化过程以及优化后的效果     

BMS在数据中心冷冻站系统中的应用

随着国家"十二五"产业规划中经济结构转型政策的出台,云计算作为一种新兴产业得到国家的大力支持。最近几年,其发展速度异常迅猛。数据中心作为云计算的基础设施,也相应得到了快速发展。随着数据中心的规模越来越大,服务器的发热密度越来越高,能源消耗的问题日益突出。针对目前数据中心工程中被大量应用的冷冻水系统,详细描述建筑管理系统(BMS)在系统设计时应着重考虑的要点,并详细分析其控制逻辑,使得一套完整的BMS控制方案可在系统运行时发挥其巨大的作用。     

An adaptive Kalman filtering based State of Charge combined estimator for electric vehicle battery pack

Ah counting is not a satisfactory method for the estimation of the State of Charge (SOC) of a battery, as the initial SOC and coulombic efficiency are difficult to measure. To address this issue, a new SOC estimation method, denoted as “AEKFAh”, is proposed. This method uses the adaptive Kalman filtering method which can avoid filtering divergence resulting from uncertainty to correct for the initial value used in the Ah counting method. A Ni/MH battery test procedure, consisting of 8.08 continuous Federal Urban Driving Schedule (FUDS) cycles, is carried out to verify the method. The SOC estimation error is 2.4% when compared with the real SOC obtained from a discharge test. This compares favorably with an estimation error of 11.4% when using Ah counting.     

AGV车用锂离子电池管理系统设计

随着动力锂离子电池在电动汽车上的运用技术的发展,锂离子电池作为自动引导运输车的动力电池开始受到人们的关注。针对自动引导运输车锂离子电池使用的安全性和效率问题,提出了一种基于恒流/恒压充电均衡的电池管理系统(BMS)方案。实验表明,该系统荷电状态(SOC)估计精度达到5%,单体电压采样精度2 m V,均衡电流达10 A。在最大充电电流300 A和放电电流150 A条件下实现了自动导引运输车动力锂离子电池安全高效运行。     

采用小波变换的有效值和频率测量方法

讨论了对含谐波的正弦电压(电流)采样值直接进行小波变换计算基波、谐波电压(电流)的有效值及频率的方法.频率测量中,应用数字测频法对极值点法进行改进.利用小波变换算法对短时间信号进行分析,得到了很好的测量结果.仿真结果表明,在理想采样的情况下(采样过程不存在同步误差),利用小波变换的方法可以对有效值和频率进行准确的测量.     

大坝电厂1、2号锅炉MFT外部接线逻辑的改进

通过对大坝电厂1、2号锅炉MFT外部接线回路可靠性的分析,提出了提高回路可靠性的简单、经济适用的改进方法.实施后,不仅提高了回路的可靠性,而且便于维护.     

A roadmap towards intelligent net zero- and positive-energy buildings

Buildings nowadays are increasingly expected to meet higher and more complex performance requirements: they should be sustainable; use zero-net energy; foster a healthy and comfortable environment for the occupants; be grid-friendly, yet economical to build and maintain. The essential ingredients for the successful development and operation of net zero- and positive-energy buildings (NZEB/PEB) are: thermal simulation models, that are accurate representations of the building and its subsystems; sensors, actuators, and user interfaces to facilitate communication between the physical and simulation layers; and finally, integrated control and optimization tools of sufficient generality that using the sensor inputs and the thermal models can take intelligent decisions, in almost real-time, regarding the operation of the building and its subsystems. To this end the aim of the present paper is to present a review on the technological developments in each of the essential ingredients that may support the future integration of successful NZEB/PEB, i.e. accurate simulation models, sensors and actuators and last but not least the building optimization and control. The integration of the user is an integral part in the dynamic behavior of the system, and this role has to be taken into account. Future prospects and research trends are discussed.