共查询到20条相似文献,搜索用时 421 毫秒
1.
2.
以太网是当今应用最为普遍的局域网技术,本文描述了企业园区网建设的主要技术,进行了关于布线系统和网络组网的探讨。 相似文献
3.
Lightning and electro-magnetic pluse-induced fuselage skin currents can magnetically or electrically flux couple onto air-craft cabling through dielectric "holes" or apertures in the aircraft fuselage. Using lightning transient analysis (LTA) input-output waveform records, frequency domain techniques are presented that locate the exact point of excitation. The techniques are demonstrated using an RG-58 cable simulation and are then applied to the yaw damper circuit of a USAF F-111. 相似文献
4.
5.
大型复合航天器的建模与分散控制技术 总被引:4,自引:0,他引:4
综述了空间站一类大型复合航天器的建模与控制方法,首先分析了大型复合航天器的结构动力学特性以及对其进行有效控制所面临的主要困难,然后研究了便于控制系统工程实现的大型复合航天器建模方法,继而对大系统分散控制技术在大型复合航天器控制中的应用前景作了详尽分析,指出分散变结构控制方法和分散协同控制技术在大型复合航天器控制中的优越性;最后还探讨了大型复合航天器系统设计中必须注意的一些工程实际问题。 相似文献
6.
The most important sensors for gathering target information onboard a submarine are passive sonars. Problems concerning fusion of these passive sonars are discussed. Three typical passive sonars-passive noise sonar, passive ranging sonar and acoustic pulse surveillance sonar-constitute a passive sonar system for data fusion. This paper is concerned mainly with problems of significance in system development, such as tactical application background, special fusion techniques and own-ship maneuver considerations 相似文献
7.
飞机各系统的密封性主要是靠橡胶O形圈来保证的,因此,严格控制橡胶O形圈的质量是实现飞机系统密封安全的关键。本文针对某型飞机橡胶O形圈研制中存在的一些影响工艺稳定性的问题进行了研究分析,提出了改进措施。在开展考核试验工作的基础上,通过方差计算,给出了一种判定O形圈工艺稳定性的方法。 相似文献
8.
A review on the recent advance in nonlinear aeroelasticity of the aircraft is presented in this paper. The nonlinear aeroelastic problems are divided into three types based on different research objects, namely the two dimensional airfoil, the wing, and the full aircraft. Different non- linearities encountered in aeroelastic systems are discussed firstly, where the emphases is placed on new nonlinear model to describe tested nonlinear relationship. Research techniques, especially new theoretical methods and aeroelastic flutter control methods are investigated in detail. The route to chaos and the cause of chaotic motion of two-dimensional aeroelastic system are summarized. Var- ious structural modeling methods for the high-aspect-ratio wing with geometric nonlinearity are dis- cussed. Accordingly, aerodynamic modeling approaches have been developed for the aeroelastic modeling of nonlinear high-aspect-ratio wings. Nonlinear aeroelasticity about high-altitude long- endurance (HALE) and fight aircrafts are studied separately. Finally, conclusions and the chal- lenges of the development in nonlinear aeroelasticity are concluded. Nonlinear aeroelastic problems of morphing wing, energy harvesting, and flapping aircrafts are proposed as new directions in the future. 相似文献
9.
10.
11.
MARC (modeling, animation, rendering, and compositing), a system using advanced computer graphics and animation techniques for spacecraft mission simulation, is described. The MARC system provides capabilities for generating complex models of both man-made and natural phenomena. The system models orbital dynamics of terrestrial satellites, supports solid models for the Earth, Sun, and Moon, and simulates the dynamics of terrestrial satellites for arbitrary elliptical orbits. A stellar background including magnitudes and spectral types is generated. The elements of the MARC system, including object modeling tools, orbital animation techniques, the rendering system used to compute individual frames, and the compositing techniques used, are discussed. The software architecture of the MARC system and the hardware used to support the system are described 相似文献
12.
High performance communications, navigation, and identification (CNI) functions on modern military aircraft are increasingly required for mission readiness. The operation of simultaneous waveforms through an integrated avionics rack of shared resources becomes a test in moving data rapidly from one signal processing stage to the next. The IEEE 1394, or Firewire, is a commercial high bandwidth bus whose 64-bit addressing and maximum 400 Mbits/second throughput satisfies this demanding military avionics interconnect need. The challenge in applying this commercial product to integrated avionics is the requirement to seamlessly add message priority encoding. By having message priorities, the slower strategic communications links will not impair the performance of higher data rate tactical communications, thereby avoiding potentially life-threatening bottlenecks. The flight environment imposes additional challenges to ruggedize the cabling between integrated avionics racks and to utilize the full capabilities of the Firewire bus. A discussion of the physical, data link, network, and transport layers, as used in avionics applications will be done. Additionally, the versatility of 1394 in military avionics with its variable channel sizes, bandwidth on demand, hierarchical addressing, and upgrade to 800 and 1600 Mbps with a 64-bit wide data path, is emphasized. Finally, system maintenance advantages of 1394's hot pluggable features are discussed, with an eye toward cost reduction on the flight line and total operational time of the aircraft avionics systems 相似文献
13.
14.
The en route monitor system (ERMS), which is a software system designed to assist human controllers, was developed as a tool for the control center. A domain-specific knowledge-based design approach was used. The system is implemented in Turbo Prolog. The problem and solution techniques are discussed in detail, and examples and simulations are demonstrated to show the potential application of the ERMS in air traffic control 相似文献
15.
民航发动机远程故障诊断若干关键技术研究 总被引:5,自引:0,他引:5
本文提出的民航发动机远程故障诊断技术将Internet网络技术与民航发动机故障诊断技术有效地结合起来,旨在将民航发动机的维护和故障诊断手段提升到远程的网络环境,以极大提高故障诊断的水平和时效性。本文从工程应用角度出发,对其中的几个关键技术问题进行了讨论。首先分析了民航发动机故障诊断的技术现状,提出了民航发动机远程故障诊断系统的结构体系。提出一种诊断设备网络化的设计思想,即采用上下位机的结构和COM组件技术,实现远程操作、状态监视和控制。采用COM组件技术和网络数据库技术实现了在Web服务器上的知识的存储与推理。分别基于NI的Labview/GWebServer和DataSocket技术,开发了两种多功能的远程故障诊断的协同工作环境(CSCW)。 相似文献
16.
Haque S.I. Ionescu T.V. Sripad A.B. 《IEEE transactions on aerospace and electronic systems》1982,(1):94-101
A new method for ground testing a complex avionics system in an integrated manner has been developed. A case study for the space shuttle, on which the concept has been successfully implemented, is described. The advantages over current testing techniques and the extension of the concept to other strategic systems are discussed. 相似文献
17.
卫星-惯性-星光最优组合导航系统在航天飞机导航中的应用 总被引:1,自引:0,他引:1
文中对航天飞机星光-惯性导航系统进行了简要分析从最优系统组成原理、余度管理方法、系统性能分析等方面研究了卫星-惯性-星光组合导航系统的概念设计。 相似文献
18.
Airship dynamics modeling: A literature review 总被引:3,自引:0,他引:3
19.