基于MCGS组态软件的上位机控制系统设计

文章以自动插件机为例,介绍了基于MCGS工业组态软件的上位机控制系统的开发与设计,阐述了该系统的构成、功能及MCGS组态软件在该系统中的应用。上位机采用嵌入式WINCE操作系统和MCGS嵌入式组态软件,下位机采用PLC来控制。人机界面的设计主要用MCGS提供的绘图工具箱来完成,各个控制窗口之间的逻辑控制、各个窗口内的功能实现以及各个按钮控件、文本框等图形对象的功能主要用MCGS的脚本语言来完成。上位机与PLC之间的通讯主要通过设备窗口来完成,在设备窗口中建立系统与PLC设备的连接关系,实现对工业过程的实时监控。     

硅微陀螺仪零偏稳定性的优化

为了进一步提高硅微陀螺仪的零偏稳定性,使其满足更高精度应用场合的需求,研究了硅微陀螺仪零偏稳定性优化技术。以典型Z轴硅微陀螺仪为例,对影响其零偏稳定性的主要因素：机械耦合误差、电路耦合误差、机械热噪声、接口电路噪声进行了完整分析,并从抑制零偏温度漂移及输出噪声两个角度提出了改善硅微陀螺仪零偏稳定性的设计原则。基于上述原则,优化设计了硅微陀螺仪的机械结构及接口电路。最后对所设计的硅微陀螺仪进行了零偏稳定性测试,以验证所提出优化设计原则的有效性。实验结果表明,4个测试组的硅微陀螺仪零偏输出均无明显漂移,且零偏稳定性在6（°）/h左右,达到了中等战术级水平。     

Review of Fan Integrity Testing and Hold Time Standards

The paper examines the basis of the NFPA, British and ISO/CEN fan integrity testing and hold time standards. It is found that the most appropriate leakage area definition for integrity testing is Equivalent Leakage Area in CAN/CGSB-149.10-M86. Differences between the standards are discussed, an error in the NFPA standards is described, and other changes to the standards are recommended. Areas for further research are proposed to enable the errors in calculated hold times to be estimated with confidence and, if necessary, reduced.     

Extensions To Standard Hold Time Calculations

The paper extends existing methods of calculating the hold time for a fire extinguishing gas in an enclosure to cover mechanical HVAC systems and wide descending interfaces, and compares the wide descending interface model's predictions with some experimental data. A simple approximation to the measured wide descending interface gives conservative hold time predictions, while the sharp descending interface model used in current standards gives optimistic predictions.     

微弧等离子喷涂制备空心莫来石隔热涂层研究

采用微弧等离子喷涂方法制备了空心微珠莫来石隔热涂层。研究了涂层的结合强度、隔热性能和抗热震性能。实验结果表明：拉伸断裂发生在莫来石涂层内,涂层的平均结合强度约为5.63 MPa;稳态测量涂层隔热温度,当涂层表面温度为400℃～800℃时,涂层的隔热温度变化范围为11.5℃～40℃;热震温度为400℃～800℃间隔100℃时,涂层的抗热震次数分别为165、135、117、81和34次;涂层先从试样边沿开始剥落,并呈加速剥落的趋势。涂层失效主要原因是由于热震过程中残余应力积聚造成的。     

岭澳二期反应堆控制系统数字化技术应用及其工程适应性研究

反应堆控制系统是核电厂仪控系统的重要组成部分.在岭澳二期工程中,由于采用先进的数字化技术,需要在多方面考虑有关的适应性变化.本文通过对数字化技术的应用研究,论述了反应堆控制系统在采用数字化技术之后的新要求、相应的新设计特点和适应性研究的成果.     

面向在轨服务航天器模块接口标准化设计

可接受在轨服务航天器标准化设计的关键是模块接口的标准化设计。通过对模块接口的分类及其功能的分析,首先总结模块接口标准化设计的必要性和优势。然后在对模块接口特性和接口的数据结构信息进行分析的基础上,提出应用QFD和TRIZ理论对模块接口进行标准化设计的观点。     

金属／陶瓷颗粒与接触面的热相互作用数值仿真研究

本文利用ANSYS有限元程序,仿真了在等离子喷涂过程中熔融的金属、陶瓷颗粒与接触面的热相互作用,给出了“温度－时间”关系以及接触 界面处接触温度的研究方法;结合功能梯度材料的制备,研究了不同材料颗粒,包括金属Ni颗粒,Al2O3陶瓷颗粒与接触界面之间的热相互作用。其结果为研究涂层牢固结合的基本物理化学过程提供了必需的理论依据。     

铝基复合材料阻尼的微观机制分析

通过透射电镜分析了铝基复合材料阻尼行为规律的微观机制 ,阐明了位错、界面和增强相内耗对复合材料阻尼的影响。     

CFD modeling of thermal contact resistance between solid contacting surfaces

Heat transfer has considerable applications in different industries such as designing of heat exchanger, nuclear reactor cooling, control system for spacecraft, and designing of microelectronics cooling. As the surfaces of two metals contact each other, this issue becomes so crucial. Thermal contact resistance (TCR) is one of the key physical parameters in heat transfer of mentioned surfaces. Measuring the experimental value of TCR in laboratory is highly expensive and difficult. As an alternative, numerical modeling methods could be engaged. In this study, inverse problem method solution is utilized as a proper method for estimation of TCR value. In this order, three different configurations (flat-flat, flat-cylinder, and cylinder-cylinder) were utilized in two steady and unsteady state conditions to predict the value of TCR. A comparison between the measured values and obtained values from the simulation show the errors for flat-flat, flat-cylinder, and cylinder-cylinder configuration after 10 min from starting the experiment are 4.6074%, 0.1662%, and 0.5622%, respectively. And in steady-state condition, the corresponding errors are 6.06e-3%, 1.506%, and 0.846%, respectively. In conclusion, the final results establish the fact that the inverse problem method solution can predict TCR values between contacting surfaces.