一种自整定模糊PID型控制器

摘 要 本文提出一种简单的模糊PID型控制器，分析了其结构组成，介绍了基于自整定量化因子的参数整定方法，并利用小增益定理对BIBO系统的稳定性进行了研究。仿真结果表明这种控制系统的性能优于线性PID控制器。     

Portable end-to-end ground system for low-cost mission support

This paper presents a revolutionary architecture of the end-to-end ground system to reduce overall mission support costs. The present ground system of the Jet Propulsion Laboratory (JPL) is costly to operate, maintain, deploy, reproduce, and document. In the present climate of shrinking NASA budgets, this proposed architecture takes on added importance as it should dramatically reduce all of the above costs. Currently, the ground support functions (i.e., receiver, tracking, ranging, telemetry, command, monitor and control) are distributed among several subsystems that are housed in individual rack-mounted chassis. These subsystems can be integrated into one portable laptop system using established Multi Chip Module (MCM) packaging technology and object-based software libraries. The large scale integration of subsystems into a small portable system connected to the World Wide Web (WWW) will greatly reduce operations, maintenance and reproduction costs. Several of the subsystems can be implemented using Commercial Off-The-Shelf (COTS) products further decreasing non-recurring engineering costs. The inherent portability of the system will open up new ways for using the ground system at the “point-of-use” site as opposed to maintaining several large centralized stations. This eliminates the propagation delay of the data to the Principal Investigator (PI), enabling the capture of data in real-time and performing multiple tasks concurrently from any location in the world. Sample applications are to use the portable ground system in remote areas or mobile vessels for real-time correlation of satellite data with earth-bound instruments; thus, allowing near real-time feedback and control of scientific instruments. This end-to-end portable ground system will undoubtedly create opportunities for better scientific observation and data acquisition.     

艾俊强 气动布局专家

气动布局是飞机设计过程中非常重要的一环,作为中航工业气动布局专家,请您谈谈飞机气动布局设计的重要性以及国内外的发展现状。艾俊强:气动布局是飞机方案设计的核心技术,气动布局方案的好坏直接影响到型号的成败。飞机气     

达诺巴特助力大飞机制造

达诺巴特集团是西班牙最大的机床制商,在整个欧洲也位居20强这列.2008年我集团在全球的销售额达到了2.9亿欧元,其中中国市场的销售就达到了3200万欧元.航空航天制造业作为达诺巴特集团的一个重要战略发展领域,每年的销售额占集团总%售额15%以上.     

朱知寿 钛合金材料专家

<正>作为航空材料宗师颜鸣皋院士和曹春晓院士的弟子,您可谓是航空钛合金材料技术领域的集大成者,请您谈谈目前航空用钛合金的国内外研究及应用情况。朱知寿:飞机结构用钛合金已从追求单一高性能(如高强度,包括