改进的次时间最优控制

本文在[1][2]基础上进一步探讨了次时间最优控制的改进问题,深入地阐明了次时间最优控制的某些特性后,提出了一个新的改进的设计方法。按照这种方法设计控制系统,不但实用而且可以大幅度提高次时间最优控制的最优性。并用实例比较了各种方法,证明了本文提出的方法的优越性。本文提出的方法应用于工程设计,对于提高系统的最优性是非常有效的。     

阻尼材料在飞机炮振减振上的应用

阻尼材料在飞机结构上的应用是一个新课题。在飞机炮舱区应用新型阻尼材料,组成一个全新的阻尼结构系统来吸收由航炮射击时产生的冲击能量,以实现减振的设计目的,进而改善其炮击的振动环境。通过理论计算和地面试验实测,证明了应用新型阻尼材料可使炮舱区的动应力下降近30％。     

数控系统内置式PLC的FPGA实现方法

提出了一种用FPGA实现数控系统内置式PLC的方法.通过在FPGA内部实现PLC逻辑,并提供能够编译PLC指令的编译器,实现了数控系统对通用PLC编程语言的支持.所述方法在基于ARM FPGA的数控系统上得到了实现.     

我省高职高专院校图书馆现代技术应用情况调查

目的比较与探讨不同类型高职高专图书馆现代化技术应用情况方法采用自编问卷对部分高职高专图书馆进行调查结果高职高专图书馆情况差异较大二级学院、民办学院处于前列,新高职、高专、职工大学紧随其后,挂靠学院与普通中专正在崛起。     

Digital Aircraft Sheet Metal Part Manufacturing System and Its Key Technology

The architecture of digital sheet metal manufacturing system is proposed based on the classification of sheet metal manufacturing information.The essence of digital manufacturing is the definition,management and transfer of information,and the key technologies are brought forward and described.It is pointed out that knowledge-based manufacturing elements design is necessary to make digital technology efficient.The management of all kinds of sheet metal manufacturing element information is to build single source of manufacturing data.Multi-state model-based digital transfer and coordination method is designed to provide a foundation for digital manufacturing of aircraft sheet metal part.The application of digital sheet metal manufacturing is exemplified with an aircraft sheet metal part.The application result is compared to that of the traditional analog transfer technology.It is shown that the developed technology can improve part quality,shorten manufacturing time and lower manufacturing cost.     

400kN振动台承力钢架的研制

文章中介绍的400kN 承力钢架是用来作船罩联合试验的承力机构,具有结构庞大、复杂的特点,对自振频率有一定要求,文章介绍了该设备研制过程中的设计、计算、加工及安装工艺技术等。     

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