2004 IEEE Aerospace Conference Proceedings (IEEE Cat. No.04TH8720)最新文献_第7页

Practical diagnostic algorithms for run-time systems 运行时系统的实用诊断算法

2004 IEEE Aerospace Conference Proceedings (IEEE Cat. No.04TH8720) Pub Date : 2004-03-06 DOI: 10.1109/AERO.2004.1368153

W. Wang, L. Jaw

引用次数: 0

2-D liquid crystal optical phased array 二维液晶光学相控阵

2004 IEEE Aerospace Conference Proceedings (IEEE Cat. No.04TH8720) Pub Date : 2004-03-06 DOI: 10.1109/AERO.2004.1367690

X. Wang, B. Wang, P. Bos, J. Anderson, P. McManamon

引用次数: 7

ISS program infrastructure upgrades to enhance science return: current, planned & potential 国际空间站项目基础设施升级以提高科学回报:当前，计划和潜在

2004 IEEE Aerospace Conference Proceedings (IEEE Cat. No.04TH8720) Pub Date : 2004-03-06 DOI: 10.1109/AERO.2004.1367589

H. J. Durham

引用次数: 2

2004 IEEE Aerospace Conference Proceedings (IEEE Cat. No.04TH8720) Pub Date : 2004-03-06 DOI: 10.1109/AERO.2004.1368182

S. Wegerich

{"title":"Similarity based modeling of time synchronous averaged vibration signals for machinery health monitoring","authors":"S. Wegerich","doi":"10.1109/AERO.2004.1368182","DOIUrl":"https://doi.org/10.1109/AERO.2004.1368182","url":null,"abstract":"Monitoring rotating machinery is often accomplished with the aid of vibration sensors. The vibration sensor signals contain a wealth of complex information that characterizes the dynamic behavior of the machinery. Transforming this information into useful knowledge about the health of the machine can be challenging due to the presence of extraneous noise sources and variations in the vibration signal itself. This is particularly true in situations in which the rotating machinery is monitored under varying loads and/or speeds. In order for any gained knowledge or insight into the health of machinery to be useful, it must be actionable. This is achieved by detecting incipient faults as early as possible. A novel approach to vibration monitoring that employs a multivariate similarity-based modeling (SBM) technique to characterize the expected behavior of time synchronous averaged spectral features is shown to enable the detection in rotating machinery. This in turn facilitates the assessment of machine health and enables fault diagnostics and ultimately prognostics. SBM has been applied successfully to a variety of non-vibration related multi-sensor, health monitoring applications. Our new approach builds off of these experiences and a combination of signal processing algorithms to expand the overall applicability of SBM into single sensor vibration monitoring. We discuss an approach to gearbox fault monitoring using vibration data and SBM. This new approach is described in detail and is applied to actual H-60 gearbox vibration data acquired from seeded fault tests conducted by U.S. Naval Air Systems Command (NAVAIR) at the Helicopter Transmission Test Facility (HTTF) in Patuxent River, MD in 2001 and 2002.","PeriodicalId":208052,"journal":{"name":"2004 IEEE Aerospace Conference Proceedings (IEEE Cat. No.04TH8720)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123846008","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 52

Enhancing the process of testing object-oriented systems 增强测试面向对象系统的过程

2004 IEEE Aerospace Conference Proceedings (IEEE Cat. No.04TH8720) Pub Date : 2004-03-06 DOI: 10.1109/AERO.2004.1368118

I. Alkadi, G. Alkadi

{"title":"Enhancing the process of testing object-oriented systems","authors":"I. Alkadi, G. Alkadi","doi":"10.1109/AERO.2004.1368118","DOIUrl":"https://doi.org/10.1109/AERO.2004.1368118","url":null,"abstract":"E.W. Dijkstra said, \"Testing proves the presence, not the absence, of bugs\". Testing is a crucial step in the overall system development process. Using testing techniques that support features of the underlying software paradigm more effectively tests program than do testing techniques that support features of other paradigms. Systems developed with the object-oriented paradigm require techniques that support object-oriented features such as inheritance, data abstraction, encapsulation, and dynamic binding. Many techniques that are used to test systems developed with the structured paradigm are not sufficient for the testing of object-oriented systems. The goal of this research is to develop methods that will improve the process of testing object-oriented systems. Specifically, emphasis is given to improving the level of testing of methods because the level of method testing is generally considered inadequate. Algorithms are included that identify the set of methods, both interobject and intraobject, that should be tested for a given system. These algorithms are implemented as a part of an automated testing system that derives a framework for the testing of methods. This system includes the automatic generation of test drivers to facilitate the testing. It captures the results of tests for the purposes of reuse for future system maintenance. This framework provides the software engineer who is testing a system a mechanism to determine the level of method coverage that has been achieved in the testing process.","PeriodicalId":208052,"journal":{"name":"2004 IEEE Aerospace Conference Proceedings (IEEE Cat. No.04TH8720)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123210543","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

AgCam: scientific imaging from the ISS Window Observational Research Facility AgCam:来自国际空间站窗口观测研究设施的科学成像

2004 IEEE Aerospace Conference Proceedings (IEEE Cat. No.04TH8720) Pub Date : 2004-03-06 DOI: 10.1109/AERO.2004.1367585

N. Hulst, J. Barton, J. Carpenter, C. Frey, J. Hammes, A. Johnson, D. Olsen, R. Schultz, B.W. Scilley, G. Seielstad, W. Semke, S. Threinen, P. Ubbi, R. Voeller, W.J. Wambsganss, A. Webster, Chang-Hee Won, A. Zeller

{"title":"AgCam: scientific imaging from the ISS Window Observational Research Facility","authors":"N. Hulst, J. Barton, J. Carpenter, C. Frey, J. Hammes, A. Johnson, D. Olsen, R. Schultz, B.W. Scilley, G. Seielstad, W. Semke, S. Threinen, P. Ubbi, R. Voeller, W.J. Wambsganss, A. Webster, Chang-Hee Won, A. Zeller","doi":"10.1109/AERO.2004.1367585","DOIUrl":"https://doi.org/10.1109/AERO.2004.1367585","url":null,"abstract":"The agricultural camera (AgCam) is a two-band digital imaging payload that will be operated in the pressurized Window Observational Research Facility (WORF) onboard the International Space Station. Its primary mission is to provide on-demand, high-resolution remote sensing imagery to support precision agriculture and natural resource end-users in the Upper Midwest. The major benefits of AgCam are its ability to provide 10-meter data in two spectral bands, to make map products available to end-users within 48 hours of data acquisition, and to be able to revisit any site in the Upper Midwest within 2-to-3 days throughout most of the growing season. In addition, the system will deliver map products without any per-scene cost as a service to regional end-users. AgCam is being designed, built, and tested by students at the University of North Dakota, under the supervision of faculty and staff in the John D. Odegard School of Aerospace Sciences and the School of Engineering & Mines.","PeriodicalId":208052,"journal":{"name":"2004 IEEE Aerospace Conference Proceedings (IEEE Cat. No.04TH8720)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121432956","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

Visual, tactile, and vibration-based terrain analysis for planetary rovers 基于视觉、触觉和振动的行星探测器地形分析

2004 IEEE Aerospace Conference Proceedings (IEEE Cat. No.04TH8720) Pub Date : 2004-03-06 DOI: 10.1109/AERO.2004.1367684

K. Legnemma, C. Brooks, S. Dubowsky

引用次数: 50

Search algorithms for space tug rendezvous: simulation and experiment 空间拖船交会搜索算法:仿真与实验

2004 IEEE Aerospace Conference Proceedings (IEEE Cat. No.04TH8720) Pub Date : 2004-03-06 DOI: 10.1109/AERO.2004.1367626

G. Bounova, T. de Mierry, O. de Weck

{"title":"Search algorithms for space tug rendezvous: simulation and experiment","authors":"G. Bounova, T. de Mierry, O. de Weck","doi":"10.1109/AERO.2004.1367626","DOIUrl":"https://doi.org/10.1109/AERO.2004.1367626","url":null,"abstract":"Space tugs must be able to search for and identify inert non-communicative targets, whose ephemeris is only known approximately. The goal of this article is to evaluate the efficiency of three possible two-dimensional search strategies in the context of autonomous rendezvous in space. As part of a broader Space Tug project, a number of modeling challenges were addressed to validate the experimental results. A crucial problem was to reduce the complex space search problem to a simple two-dimensional search for an inert target using LEGO robots. The data collected, as well as results from simulations, showed strong trends in the relationship between time and energy expended during the search. The project provided a starting point for the rendezvous control system to be implemented in a Space Tug vehicle by showing which of the three strategies - random, semi-autonomous and autonomous - is most efficient in the two-dimensional search case. It was found that the semi-autonomous algorithm is the most energetically efficient approach, but also the most time-consuming. This finding disproved our initial belief that the semi-autonomous (human-in-the-loop) strategy is the most efficient in terms of both time and energy. Instead, the conclusion is that an autonomous algorithm is more suitable for space applications. The results also suggest that, depending on knowledge of the search space and mission requirements, a hybrid approach might be most efficient.","PeriodicalId":208052,"journal":{"name":"2004 IEEE Aerospace Conference Proceedings (IEEE Cat. No.04TH8720)","volume":"48 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2004-03-06","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114355534","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

An improved hybrid interferometer 一种改进的混合干涉仪

2004 IEEE Aerospace Conference Proceedings (IEEE Cat. No.04TH8720) Pub Date : 2004-03-06 DOI: 10.1109/AERO.2004.1367694

R. Penno, K. Pasala, S. Schneider

引用次数: 1

NASA/JPL Tumbleweed polar rover NASA/JPL滚草极地探测器

2004 IEEE Aerospace Conference Proceedings (IEEE Cat. No.04TH8720) Pub Date : 2004-03-06 DOI: 10.1109/AERO.2004.1367622

A. Behar, J. Matthews, F. Carsey, J. Jones

引用次数: 58