2009 IEEE Aerospace conference最新文献_第2页

Rad-Hard high speed serial communication using Honeywell SerDes macros Rad-Hard高速串行通信使用霍尼韦尔SerDes宏

2009 IEEE Aerospace conference Pub Date : 2009-03-07 DOI: 10.1109/AERO.2009.4839504

G. Roosevelt, D. Bueno, J. Haque, Weston Roper, Thomas Romanko

引用次数: 3

Latest developments on SpaceX's Falcon 1 and Falcon 9 launch vehicles and Dragon spacecraft SpaceX公司猎鹰1号和猎鹰9号运载火箭以及龙飞船的最新进展

2009 IEEE Aerospace conference Pub Date : 2009-03-07 DOI: 10.1109/AERO.2009.4839555

L. Dreyer

引用次数: 16

Mars Lander Engine plume impingement environment of the Mars Science Laboratory 火星着陆器引擎羽流撞击环境的火星科学实验室

2009 IEEE Aerospace conference Pub Date : 2009-03-07 DOI: 10.1109/AERO.2009.4839345

A. Sengupta, J. Kulleck, S. Sell, John W. Van Norman, M. Mehta, Mark Pokora

{"title":"Mars Lander Engine plume impingement environment of the Mars Science Laboratory","authors":"A. Sengupta, J. Kulleck, S. Sell, John W. Van Norman, M. Mehta, Mark Pokora","doi":"10.1109/AERO.2009.4839345","DOIUrl":"https://doi.org/10.1109/AERO.2009.4839345","url":null,"abstract":"The Mars Science Laboratory (MSL) Mission will land a 900-kg rover on the surface of Mars in 2010. Four Mars Lander Engines (MLE's) will be fired during the final propulsive descent to maintain a 0.75 m/s vertical rate of descent, in support of a tethered landing approach referred to as the “Sky-Crane”. At 20 m above the surface the rover will be lowered on a bridle as it continues to descend. At touch-down, a minimum of 6.5 m of vertical separation are provided between the engines nozzle exit plane and the ground-surface below [1]. This maneuver was chosen in part to minimize the ground/soil interaction that occurs when rocket engine plumes are fired into a soil media. In spite of the 6.5 m altitude above the surface, surface impingement pressures are expected to reach in excess of 2000 Pa, a metric previously established by the Viking program to mitigate soil bearing capacity failure. Plume-ground interaction has been a concern of Lunar and Mars propulsive landings for some time, but was not an issue for the Mars Pathfinder and Mars Explorer Rover era due to their use of airbag landing systems [2][3].This was also a concern of the Phoenix lander program, which fired twelve pulsed hydrazine monopropellant thrusters for its final descent and touch-down [4]. Phoenix was concerned with plume impingement soil interaction due to its high surface impingement pressure and potential for diffused gas eruptions. Phoenix was also concerned with landing site alteration due to its lack of mobility as well as instrument and solar array contamination issues. As MSL will operate in a regime that will result in ground-soil erosion a plume-ground interaction program has been undertaken to quantify the amount of soil erosion, namely the trajectory and number flux of particulates and the contamination and erosion this can impart to sensitive instruments and thermal surface coatings.","PeriodicalId":117250,"journal":{"name":"2009 IEEE Aerospace conference","volume":"43 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126626001","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: 11

Establishing presence within the service-oriented environment 在面向服务的环境中建立存在

2009 IEEE Aerospace conference Pub Date : 2009-03-07 DOI: 10.1109/AERO.2009.4839647

E. Konieczny, R. Ashcraft, D. Cunningham, S. Maripuri

引用次数: 5

Dynamic reconfigurable computing architecture for aerospace applications 航空航天应用的动态可重构计算体系结构

2009 IEEE Aerospace conference Pub Date : 2009-03-07 DOI: 10.1109/AERO.2009.4839513

B. Lameres, Clint Gauer

引用次数: 14

Molecular excitation and radiative transfer model for MIRO MIRO的分子激发和辐射传递模型

2009 IEEE Aerospace conference Pub Date : 2009-03-07 DOI: 10.1109/AERO.2009.4839628

P. von Allmen, Seungwon Lee, L. Kamp, S. Gulkis

引用次数: 0

Mechanical fault diagnosis using wireless sensor networks and a two-stage neural network classifier 基于无线传感器网络和两阶段神经网络分类器的机械故障诊断

2009 IEEE Aerospace conference Pub Date : 2009-03-07 DOI: 10.1109/AERO.2009.4839671

P. Ballal, A. Ramani, Matthew B. Middleton, Christopher D. McMurrough, A. Athamneh, Weijen Lee, C. Kwan, F. Lewis

{"title":"Mechanical fault diagnosis using wireless sensor networks and a two-stage neural network classifier","authors":"P. Ballal, A. Ramani, Matthew B. Middleton, Christopher D. McMurrough, A. Athamneh, Weijen Lee, C. Kwan, F. Lewis","doi":"10.1109/AERO.2009.4839671","DOIUrl":"https://doi.org/10.1109/AERO.2009.4839671","url":null,"abstract":"This paper has three contributions. First, we develop a low-cost test-bed for simulating bearing faults in a motor. In Aerospace applications, it is important that motor fault signatures are identified before a failure occurs. It is known that 40% of mechanical failures occur due to bearing faults. Bearing faults can be identified from the motor vibration signatures. Second, we develop a wireless sensor module for collection of vibration data from the test-bed. Wireless sensors have been used because of their advantages over wired sensors in remote sensing. Finally, we use a novel two-stage neural network to classify various bearing faults. The first stage neural network estimates the principal components using the Generalized Hebbian Algorithm (GHA). Principal Component Analysis is used to reduce the dimensionality of the data and to extract the fault features. The second stage neural network uses a supervised learning vector quantization network (SLVQ) utilizing a self organizing map approach. This stage is used to classify various fault modes. Neural networks have been used because of their flexibility in terms of online adaptive reformulation. At the end, we discuss the performance of the proposed classification method.","PeriodicalId":117250,"journal":{"name":"2009 IEEE Aerospace conference","volume":"53 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122759629","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: 16

Introducing photonics in spacecraft engineering: ESA's strategic approach 在航天器工程中引入光子学:欧空局的战略方针

2009 IEEE Aerospace conference Pub Date : 2009-03-07 DOI: 10.1109/AERO.2009.4839438

N. Karafolas, J. Armengol, I. Mckenzie

引用次数: 32

Range estimation algorithms comparison in simulated 3-D flash LADAR data 三维闪光雷达模拟数据距离估计算法比较

2009 IEEE Aerospace conference Pub Date : 2009-03-07 DOI: 10.1109/AERO.2009.4839450

S. Jordan

引用次数: 3

Evaluating algorithm performance metrics tailored for prognostics 评估为预测量身定制的算法性能指标

2009 IEEE Aerospace conference Pub Date : 2009-03-07 DOI: 10.1109/AERO.2009.4839666

A. Saxena, J. Celaya, B. Saha, S. Saha, K. Goebel

{"title":"Evaluating algorithm performance metrics tailored for prognostics","authors":"A. Saxena, J. Celaya, B. Saha, S. Saha, K. Goebel","doi":"10.1109/AERO.2009.4839666","DOIUrl":"https://doi.org/10.1109/AERO.2009.4839666","url":null,"abstract":"Prognostics has taken center stage in Condition Based Maintenance (CBM) where it is desired to estimate Remaining Useful Life (RUL) of a system so that remedial measures may be taken in advance to avoid catastrophic events or unwanted downtimes. Validation of such predictions is an important but difficult proposition and a lack of appropriate evaluation methods renders prognostics meaningless. Evaluation methods currently used in the research community are not standardized and in many cases do not sufficiently assess key performance aspects expected out of a prognostics algorithm. In this paper we introduce several new evaluation metrics tailored for prognostics and show that they can effectively evaluate various algorithms as compared to other conventional metrics. Four prognostic algorithms, Relevance Vector Machine (RVM), Gaussian Process Regression (GPR), Artificial Neural Network (ANN), and Polynomial Regression (PR), are compared. These algorithms vary in complexity and their ability to manage uncertainty around predicted estimates. Results show that the new metrics rank these algorithms in a different manner; depending on the requirements and constraints suitable metrics may be chosen. Beyond these results, this paper offers ideas about how metrics suitable to prognostics may be designed so that the evaluation procedure can be standardized.","PeriodicalId":117250,"journal":{"name":"2009 IEEE Aerospace conference","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2009-03-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121901588","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: 116