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检索条件"丛书名=Progress in Astronautics and Aeronautics"

共 175 条记录，以下是11-20 订阅

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Selected Aerothermodynamic Design Problems of Hypersonic Flight Vehicles 2009

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丛书名： progress in astronautics and aeronautics

2009年

作者： Ernst Heinrich Hirschel Claus Weiland

ISBN: (数字)9783540899747

ISBN: (纸本)9783540899730

This volume addresses selected aerothermodynamic design problems for three vehicle classes: winged reentry, non-winged reentry, and airbreathing hypersonic flight vehicles. Following an introductory chapter, the book presents the basics of flight trajectory mechanics, giving the aerothermodynamicist an understanding of the principal issues relevant to the field. In the following chapters, specific aerothermodynamic phenomena are discussed for the three vehicle classes, major simulation problems are singled out, and particular trends are examined. Available coefficients of longitudinal motion are presented for a variety of shapes of operational and studied vehicles, and aerothermodynamic issues of stabilization, trim, and control devices are treated. A full chapter is devoted to describing equations for aerodynamic forces, moments, center of pressure, trim, and stability. Another chapter focuses on multidisciplinary design aspects, presenting the mathematical models and the coupling procedures in detail. Other chapters address the thermal state of a vehicle surface, thermal loads, and thermal surface effects, which are among the major topics of hypersonic vehicle design. The governing equations for flow in thermo-chemical non-equilibrium are presented, along with properties of the earths atmosphere. Finally, constants and dimensions, symbol definitions, a glossary, acronyms, and a solution guide to problems are provided. This book will be a great boon to graduate students, doctoral students, design and development engineers, and technical managers alike.

关键词： Aerothermodynamics Aerodynamics Hypersonic Hypersonic planes

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Maximizing commercial space transportation with a public-private partnership

Maximizing commercial space transportation with a public-pri...

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9th Symposium on Earth, Moon, Mars, and Beyond

作者： Taylor, Thomas C. Lunar Transportat Syst Inc Las Cruces NM USA

ISBN: (纸本)9781563479199

The transportation market from earth to and from low earth orbit has evolved to the emergence of commercial entrepreneurs hoping to offer transportation services to general public. Everyone expects space tourism will produce low costs quickly, but entrepreneurs need the larger commercial transportation markets to raise the private money to build the orbital vehicles. The Public Private Partnership (PPP) combines private funding with government markets to accelerate the movement of mankind into space. Entrepreneurs bring a multitude of innovation, changes to the traditional aerospace industry status quo and the lowering of costs to the high cost of transportation to orbit. In PPPs Government stretches space budgets, increases vehicle innovation without cost and gains cost advantages of larger markets. Examples of PPP show some of the power for change in space possible. © 2006 by Thomas C. Taylor.

关键词： Costs

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Preparing mission operators for lunar and Mars exploration

Preparing mission operators for lunar and Mars exploration

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9th Symposium on Earth, Moon, Mars, and Beyond

作者： Parkes, Stephen M. Dunstan, Martin Martin, Iain Mancuso, Salvatore Univ Dundee Space Technol Ctr Dundee Scotland European Space Agcy Noordwijk Netherlands

ISBN: (纸本)9781563479199

Future European planetary missions will include rovers to explore the surface of Mars. Mission operators will need to be trained to operate the rovers and to cope with various problems that could possibly occur during the mission. Operator training can be done using full scale mock-ups of the rover, Martian terrain and communications system once a complete rover is available. Training for fault recovery can be difficult on a real system as introducing the fault can be difficult. Another complementary method of operator training is to use a simulation of the rover and the planetary surface over which it is moving. It is then relatively easy to introduce faults into the simulation. The University of Dundee has developed a realistic planetary surface simulation facility for use in developing vision-based navigation systems for planetary landers. This paper describes the potential use of that simulation facility for training future planetary rover operators. © 2006 by University of Dundee.

关键词： Rovers

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PARASOL and CALIPSO:: Experience feedback on operations of micro- and small satellites

PARASOL and CALIPSO:: Experience feedback on operations of m...

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9th Symposium on Earth, Moon, Mars, and Beyond

作者： Serene, Fabienne Corcoral, Nathalie Ctr Natl Etud Spatiales Ctr Spatial Toulouse Micro & Small Operat Off PARASOL 18 Ave Edouard Belin F-31055 Toulouse France Ctr Natl Etud Spatiales Ctr Spatial Toulouse Micro & Small Operat Off CALIPSO F-31055 Toulouse France

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Overview of JAXA space debris surveillance operations

Overview of JAXA space debris surveillance operations

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9th Symposium on Earth, Moon, Mars, and Beyond

作者： Hirose, Chikako Taromaru, Yoshitaka Kameyama, Masaya Aoki, Sadao Isobe, Syuzo Japan Aerosp Explorat Agcy Off Space Flight & Operat Tsukuba Ibaraki Japan Fujitsu Labs Ltd Sci Solut Grp Chiba Japan Japan Space Forum Space Utilizat Promot Dept Chiyoda ku Tokyo Japan Japan Spaceguard Assoc Shibuya ku Tokyo Japan

ISBN: (纸本)9781563479199

Japan Aerospace Exploration Agency (JAXA) started the space debris surveillance operation with radar and optical telescopes in recent years. The radar and the telescopes were built by Japan Space Forum (JSF) in cooperation with JAXA;the radar at Kamisaibara Spaceguard Center (KSGC) in 2004 and the telescopes at Bisei Spaceguard Center (BSGC) in 2000. These two systems are located in Okayama, the west part of Japan and JAXA uses them to observe space debris every day in a year. This paper will introduce the status and the concept of JAXA space debris surveillance operation and overview the future work operated by these systems. © 2006 by the American Institute of aeronautics and astronautics, Inc. All rights reserved.

关键词： Space debris

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Furthering exploration - International Space Station experience

Furthering exploration - International Space Station experie...

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9th Symposium on Earth, Moon, Mars, and Beyond

作者： Kitmacher, Gary Maxwell, Theresa G. NASA Headquarters NASA Lyndon B Johnson Space Ctr Int Space Stn Program Washington DC 20546 USA NASA Headquarters Int Space Stn Div Washington DC 20546 USA

ISBN: (纸本)9781563479199

The International Space Station (ISS) is instrumental to the exploration of space. As we expand human presence from low Earth orbit, in the next decade to the Moon, and later, to Mars and beyond, we will face challenges in management;integration;remote, longduration, assembly and maintenance operations;science and engineering;and international culture and relationships. The ISS Program is providing critical insight and amassing new knowledge in all of these areas. Use of the expertise gained in the ISS Program can reduce risks in the human exploration of space. This paper discusses the applicability of the ISS experience to the Vision for Space Exploration (VSE), specifically in the areas of crew operations, spacecraft systems operations, and crew-system interface operations.

关键词： Orbits

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From mission concept to Mars orbit: Exploiting operations concept flexibilities on Mars Express

From mission concept to Mars orbit: Exploiting operations co...

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9th Symposium on Earth, Moon, Mars, and Beyond

作者： Schulster, Jonathan R. Denis, Michel Moorhouse, Alan Rabenau, Erhard Scisys GmbH ESA Operat Flight Operat Dept Darmstadt Germany European Space Agcy European Space Operat Ctr Darmstadt Germany Nova Space Assoc Ltd Bath Avon England

ISBN: (纸本)9781563479199

Mars Express, ESA's first mission to orbit another planet, was launched on 2 June 2003 and arrived at Mars on 25 December 2003. Since orbit insertion it has successfully imaged more than 45% of Mars in infra-red and visible spectrums at resolutions of 10-100m/pixel, and returned extensive spectrometric science data for the planet's atmosphere and surface, and Mars' moon Phobos. The nominal mission ended November 2005 and a first extension will be completed end October 2007. Mars Express has also demonstrated data-relay capability for uplink/downlink to NASA MER rovers. The original mission operations concept was constrained partly by the resources available from a spacecraft designed within a very tight "flexi-class" mission budget. The major trade-off was between exploiting each pericenter pass for science, and the original concept of a single, daily, communications pass over the New Norcia ESA 35m deep-space antenna. An agreement was reached with NASA to provide pass-time on 34m and 70m antennas of the deep-space network, to provide additional downlink time and minimize pericenters lost for science. A fault in the power system, detected only after launch, left Mars Express limited to a maxi mum availability of 70% of design power for the entire mission. With long eclipses of up to 92 minutes and Mars aphelion power generation capability of less than 500W this generates a perpetual trade-off between support for the 65W X-band transmitter and science instrument operations. This paper seeks to examine the relationship between the mission operations concept and the operational flexibility that has been required to meet (and largely exceed) the mission objectives within the new envelope of constraints (power, downlink, fuel) and opportunities (additional ground stations, resources etc). The flexibilities provided by the original operations concept are identified and discussion is made of how these have been "stretched" to cope with the evolving mi ssion. Several aspect

关键词： NASA

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Spitzer Space Telescope sequencing operations software, strategies, and lessons learned

Spitzer Space Telescope sequencing operations software, stra...

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9th Symposium on Earth, Moon, Mars, and Beyond

作者： Bliss, David A. Voskanian, Vicken Weise, Timothy M. CALTECH Jet Propuls Lab Pasadena CA 91125 USA

ISBN: (纸本)9781563479199

The Space Infrared Telescope Facility (SIRTF) was launched in August, 2003, and renamed to the Spitzer Space Telescope in 2004. Two years of observing the universe in the wavelength range from 3 to 180 microns has yielded enormous scientific discoveries. Since this magnificent observatory has a limited lifetime, maximizing science viewing efficiency (ie, maximizing time spent executing activities directly related to science observations) was the key operational objective. The strategy employed for maximizing science viewing efficiency was to optimize spacecraft flexibility, adaptability, and use of observation time. The selected approach involved implementation of a multi-engine sequencing architecture coupled with non-deterministic spacecraft and science execution times. This approach, though effective, added much complexity to uplink operations and sequence development. The Jet Propulsion Laboratory (JPL) manages Spitzer's operations. As part of the uplink process, Spitzer's Mission Sequence Team (MST) was tasked with processing observatory inputs from the Spitzer Science Center (SSC) into efficiently integrated, constraint-checked, and modeled review and command products which accommodated the complexity of non-deterministic spacecraft and science event executions without increasing operations costs. The MST developed processes, scripts, and participated in the adaptation of multi-mission core software to enable rapid processing of complex sequences. The MST was also tasked with developing a Downlink Keyword File (DKF) which could instruct Deep Space Network (DSN) stations on how and when to configure themselves to receive Spitzer science data. As MST and uplionk operations developed, important lessons were learned that should be applied to future missions, especially those missions which employ command-intensive operations via a multi-engine sequence architecture. This paper describes the roles and functions of the SPITZER MST, its operational interfaces, proces

关键词： Efficiency

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In-space crew-collaborative task scheduling

In-space crew-collaborative task scheduling

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9th Symposium on Earth, Moon, Mars, and Beyond

作者： Jaap, John Meyer, Patrick Davis, Elizabeth Richardson, Lea NASA George C Marshall Space Flight Ctr Huntsville AL 35812 USA

ISBN: (纸本)9781563479199

As humans venture farther from Earth for longer durations, it will become essential for those on the journey to have significant control over the scheduling of their own activities as well as the activities of their companion systems and robots. However, the crew will not do all the scheduling;timelines will be the result of collaboration with ground personnel. Emerging technologies such as in-space message buses, delay-tolerant networks, and inspace internet will be the carriers on which the collaboration rides. Advances in scheduling technology, in the areas of task modeling, scheduling engines, and user interfaces will allow the crew to become virtual scheduling experts. New concepts of operations for producing the timeline will allow the crew and the ground support to collaborate while providing safeguards to ensure that the mission will be effectively accomplished without endangering the systems or personnel.

关键词： Scheduling

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Case studies in prediction and prevention of failures

Case studies in prediction and prevention of failures

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9th Symposium on Earth, Moon, Mars, and Beyond

作者： Bucher, Sabina Northrop Grumman Space Technol Chandra Xray Observ Chandra Flight Operat Team Redondo Beach CA USA

ISBN: (纸本)9781563479199

Many spacecraft failure modes have warning signs. Every operational program uses limit monitoring and trending in hopes of detecting these warning signs before any damage occurs. However, traditional limit monitoring and trending can easily miss the subtle changes that indicate certain types of impending failure. Once detected, preventing a looming failure requires a means of mitigating the contributing factors. This paper uses two anomalies within the Chandra Propulsion subsystem as case studies for predicting and preventing failures. The first subsystem anomaly, a reduction in thrust from the angular momentum unloading thrusters, was only detected when the duration of an operational unload was 60% longer than expected. Understanding and responding to the change in thruster performance required the ability to characterize and parameterize the anomalous behavior. To this end, a ground based, automated technique that isolates the performance of individual thrusters within a multiple thruster momentum unloading scheme was developed. With the conditions causing anomalous firings clearly identified, a new operational constraint limiting scheduling of momentum unloads was developed. The incorporation of this new constraint into mission scheduling has prevented recurrence of the anomaly. The second subsystem anomaly, cool temperatures on the sun-side propulsion feedlines, was essentially undetectable with standard trending methods. Due to the dominance of solar heating in the temperature trending data, a steep, mission long cooling trend was only revealed when the heater cycle turn on temperatures were isolated. With the trend identified, further analyses were used to characterize feedline temperature profiles with respect to time and spacecraft orientation. Using the results of these analyses, a constraint limiting dwells at orientations requiring the heaters was developed. Without detection and mitigation this trend would have continued and exposed the Chandra spacecraf

关键词： Nitrogen compounds

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