应用DCS实施大型机组的控制

根据大型机组控制特点，以空分装置空气压缩机的控制为例，重点介绍了如何应用ＴＤＣ３０００系统的控制组态软件，实施大型机组的联锁控制和防喘振控制。     

SN388多箱体的连接及验收测试

为了增大SN388的采集能力，可通过2个或多个采集箱体的连接实现道能力扩展，本文主要从双箱体的连接方法、同步启动、配置、参数设定、验收测试的参数设定（与单箱体的异同）最终测试结果，进行了详细的介绍。     

SFFT在阵列天线波束展宽技术中的应用

介绍了连续快速傅里叶变换(SFFT),该算法适用于辐射单元周期排列阵列的各种综合问题,尤其对大型阵列综合表述更简捷、性能更优良、计算速度更快。文中讨论了SFFT与交替投影法(APM)之间的关系,指出SFFT能够被视为APM应用于周期阵列综合时的特例。文中将SFFT成功应用于阵列天线方向图因子赋形设计问题,研究表明,该方法高效、实用。     

一种分级同步重力卸载试验台

卫星天线驱动机构由两个正交的旋转关节组成,为了在发射前测试其性能,提出了一种分级同步重力卸载方法,并根据该卸载方法搭建了气浮试验台。该试验台能够对天线驱动机构的两个正交关节进行重力卸载,同时提供两个关节的转动自由度。试验台采用两层结构的形式,用气浮垫和气浮主轴组合实现重力卸载,提供了驱动机构所需的两个关节的转动自由度。带载测试能够真实反映驱动机构的性能,椐此设计了基于频率和转动惯量约束的模拟负载,并安装在所设计的气浮试验台上。两层结构的形式解决了两轴转动惯量的耦合问题,同时能够达到给定的频率要求。对气浮试验台进行了测试,证明了分级同步重力卸载方法的有效性。     

具有超视距巡航的四旋翼无人机研制

本文以四旋翼作为飞行平台,用arduino mege 2560单片机,三轴陀螺仪MUP6000,三轴加速度仪MUP6000,高精度数字空气压力传感器MS5611,三轴磁力计,高精度6M-GPS,3DR RADIO与无人机实时通信,实现对无人机姿态的控制和地理坐标的检控。以APM无人机开源程序为基础,修改程序代码,依靠三轴陀螺仪和三轴加速度仪对无人机的姿态进行修正,利用GPS和气压高度计的信号对无人机的航向、位置进行修正,使无人机的飞行姿态更加稳定。实际测试表明：该无人机具有一键返航、一键定高、预先设置航点飞行、地面站实时监控和超视距巡航等功能,能够用于航拍航测等领域。     

气化炉自动升压控制优化

针对大化肥装置气化炉开工升压特点,依靠TDC3000／TPS集散型控制系统过程管理站APM的强大控制软件,灵活应用过程建点和CL/APM语言编程,结合图像编辑软件,对气化炉升压工艺过程进行控制优化,实现气化炉的自动升压功能。     

复杂环境下雷达三维探测范围

构建虚拟战场系统,为实现雷达在复杂自然环境和复杂电子干扰环境影响下的雷达探测范围,根据高级传播模型(APM)的基本原理,并综合考虑电子干扰环境的影响,提出了一个改进的支援式干扰模型。该模型混合了APM和电子干扰模型,重点考虑了大气折射率的影响,可描述复杂自然环境和复杂电子干扰环境的双重影响。在可视化时,利用点绘制代替面绘制和中点代替插值点改进了移动立方体(MC)方法,提高了渲染速度。根据数据获取、数据处理和数据渲染的流程,利用可视化软件包(VTK)实现了对雷达探测范围的三维显示。     

Solid-state hot pressing of elemental aluminum and titanium powders to form TiAl (γ + α2) intermetallic microstructure

The elemental powder metallurgy (EPM) process is used to prepare TiAl-base intermetallics. An EPM process conducted by two-stage solid-state hot pressing was employed to prepare TiAl-base intermetallics and to investigate the resulting microstructural changes. The results showed that the TiAl₃ phase forms in the first stage. During the temperature increase to the second sintering stage, lamellar phases start to precipitate in the TiAl₃ matrix. Further, the TiAl₃ phase transforms to TiAl, and Ti₃Al layers develop in the remaining titanium particles. Meanwhile, the lamellar phases grow into ring-type structures between the TiAl matrix and the Ti₃ Al layers. After the second stage, the remaining titanium particles are fully reacted, and a microstructure of Ti₃Al phases enclosed by fine-grained lamellar rings in the TiAl matrix is developed.     

The Effect of Caramel Coloring on the Multiple Degradation Pathways of Aspartame

ABSTRACT: Multiple degradation pathways accounting for the breakdown of the dipeptide sweetener a-L-aspartyl-L-phenylalanine methyl ester (a-APM) in 4 mM phosphate, pH 3.1 and a simulated cola beverage are described. At 20-, 35-, 45- and 55 °C caramel coloring concentrations greater than 700 ppm increased the rate of hydrolysis of the methyl ester forming a-L-aspartyl-L-phenylalanine. At 55 °C and pH 3.1 caramel coloring also enhanced the breakdown of a-APM degradation products. The influence of caramel coloring on the rates of degradation varied considerably for a-APM and each degradation product. A model is proposed based on the expected solution properties of caramel coloring which accounts for the enhanced degradation.     

Verbundwerkstoffe mit Aluminiumschaum – Anwendungen im Schienenfahrzeugbau

Aluminium foam composites – applications in railroad manufacturing After their rediscovery in the beginning of the 90ies foamed metals are now being produced on an industrial scale. In most applications the aluminium foam is used as composite material, i.e. in combination with other materials. The composites can be distinguished into flat or complex shaped sandwich structures on the one hand, and 3‐dimensional shaped foam parts on the other hand. The processes and feasible geometries are described. The material properties and the industrial applications are illustrated. Within a publicly funded project the utilisation of sandwich composites with an aluminium foam core layer was evaluated regarding applications for railroad vehicles. The central aim of the investigation was the production of a large segment of the vehicle’s front module. Results of this project are presented.