滚珠丝杠螺距误差补偿法提高数控机床定位精度的研究

在详细论述、对比了实现数控机床滚珠丝杠螺距误差补偿的硬件、软件方法的原理基础上,对滚珠丝杠螺距误差软件补偿法可有效提高数控机床的定位精度进行了试验验证。     

区域极点及方差约束下的航天器拦截控制：静态输出反馈情形

本文提出并讨论了具有选通窗约束的航天器拦截控制问题，指出航天器拦截控制的稳暂态性能指标可表现为系统稳态状态方差及闭环区域极点的形式。然后，基于配置控制的思想，本文完整地给出了期望静态反馈控制器的存在条件及其解析表达式，并举例说明所提设计方法的直接性与有效性     

Implementation of a novel matrix converter PMSM drive

This paper proposes a neural-network current-regulated switching strategy and an intelligent controller for a matrix converter permanent magnet synchronous motor (PMSM) drive system. By using this new switching strategy, the current harmonics of the system are effectively reduced. In addition, by using the intelligent controller, position control of the drive system can be achieved and an adjustable speed range from 1 r/min to 1500 r/min can be obtained. All the current-loop, speed-loop, and position-loop control algorithms are implemented by a 32-bit TMS320C40 digital signal processor. Several experimental results are shown to validate the theoretical analysis     

延长热电池寿命的途径探讨

从防空导弹地面电源－－热电池的热设计和工艺角度出发，分析影响电池工作寿命的因素，提出延长电池工作寿命的三条途径：合理控制热电池的内部热量；提高加热片的均匀性；合理选择外保温材料。实践证明，这些途径是可行的。     

如何为《飞机工程》撰写符合规范又有创新的论文

介绍了科技论文规范表达对收集、储存、处理、加工、检索、利用、交流和传播的作用，结合《飞机工程》投稿的实际，指出了作者在文字、标点、符号、图表、公式、量和单位表达中容易忽视和写错的一些技术细节，给出了科技论文规范表达的撰写格式，以及为《飞机工程》投稿时应注意的事项。     

碧水青山映古城——雨城雅安

雅安市坐落在四川省中部，位于四川盆地与青藏高原交接带。古为青衣羌国领地，汉代称雅州，名闻遐迩的川藏茶马古道以此为起点翻越莽莽群山逶迤西去，城边的蒙顶山是中国茶化的发祥地，憨态可掬的大熊猫也是从雅安山野里走向世界……此地自古就是多元化的交汇之所，也是地理意义上汉区与藏区和彝区的分水岭，高耸入云的大山将这里切割为迥然而异的化区和自然带，川流不息的青衣江荡涤着这座古风习习的昔日边城。     

Power anomaly effects and costs in low-voltage mobile power systems

Electric power anomalies or disturbances can disrupt the normal operation of equipment, accelerate aging, or even cause outright failures thus resulting in increased costs of maintenance and reduced system reliability. Past research on the effects caused by power anomalies has been mostly focused on industrial, commercial, or residential systems, or on power distribution equipment. A literature survey reveals that there is no comprehensive review related to low-voltage (LV) power systems and utilization equipment applicable to military combat vehicles, such as aircraft and ships. This paper summarizes the results of a new literature survey that focused on the causes, effects, and mitigation methods for power anomalies typical of LV mobile power systems. Electric power anomaly cost data collected from the literature are also presented, from which the costs of anomalies to the national defense are estimated using some simple rationales.     

离心铸造Al—20wt%Si合金自生表面复合材料的组织与性能

采用热模金属型离心铸造Al－20wt％Si合金，获得了外层聚集粗大初晶Si、中层为共晶组织、内层聚集细小初晶Si的自生三层表面复合材料。考察了复合材料的组织形貌，检测了复合材料的硬度和耐性，分析了复合材料的断裂模式。     

掠海飞行导弹击水概率的仿真研究

本文对掠海导弹的击水概率问题进行了研究,提出了用均匀设计、Monte—Carlo法和逐步回归法建立击水概率预报公式的仿真方法,并结合某型号的反舰导弹进行计算,得到了满意的结果。本文还利用表观频率和表观频谱的概念,建立起飞航导弹的背景干扰——海浪和阵风的数学模型,并用波叠加法进行了数字仿真。     

计算机辅助工时定额管理系统

介绍了南飞公司劳资处开发的计算机辅助工时定额管理系统的主要功能，系统特点及运行效果等。