| Studies in Control for Vibration Suppression of the UWAA 20-Bay Planar Truss |
91 |
113 pages |
| Authors:
Michael J. Shepherd; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
|
 | This thesis is based on research conducted at the newly constructed Aeronautics and Astronautics Control Sciences Laboratory at the University of Washington. The set up of the UWAA 20-bay planar truss is described, and is based upon a simular experimental test bed at the United States Air Force Academy. Validation of existing open loop finite element models of the truss in the cantilevered configuration was conducted for this research. The ... |
|
| Space Chambers Contamination Diagnostics and Analysis |
DEC 90 |
152 pages |
| Authors:
W. D. Williams; R. J. Bryson; W. T. Bertrand; J. H. Jones; ARNOLD ENGINEERING DEVELOPMENT CENTER ARNOLD AFS TN
|
| In order for the AEDC to meet its requirement to be the Center for Expertise (COE) for space environmental simulation, a technology effort was structured to provide the required enabling technologies. The proper simulation of the space environment in a ground test chamber requires a complete characterization and control of facility, chamber, and test article generated contaminants. To meet these testing requirements, the objectives of this project included the development ... |
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| Moving-Bank Multiple Model Adaptive Estimation and Control Applied to a Large Flexible Space Structure |
DEC 90 |
234 pages |
| Authors:
Robert B. Moyle; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH
|
| The performance of moving-bank multiple model adaptive estimation (MMAE) and control (MMAC) algorithms for large space structure control is analyzed in this thesis. The performance of a six-state filter model and associated controller are evaluated on the basis of estimation/control performance against a 24-estate truth model. A model developed using finite element analysis is used to approximate a large flexible space structure. The space structure is configured as a two-bay ... |
|
| An Evolution Operator Solution for a Nonlinear Beam Equation |
DEC 90 |
155 pages |
| Authors:
Carl E. Crockett; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
|
| A nonlinear partial differential equation, motivated by the transverse vibration of a beam, is shown to have a unique solution. The existence theory, which is in the setting of semigroups and evolution operators, is a composite and synthesis of theorems of Kato. The formulation of the problem and the verification that the formulation leads to a solution are new. The introductory chapter provides background on the topic generally. Chapter 2 ... |
|
| Conference on Affect and Flashbulb Memories |
12 OCT 90 |
7 pages |
| Authors:
Eugene Winograd; Ulric Neisser; EMORY UNIV ATLANTA GA
|
| A conference was held on February 2-3, 1990, in Atlanta on the Emory campus on the topic of Affect and Flashbulb Memories. Fourteen speakers presented their research or discussed research presented by other conferees. The primary focus was on flashbulb memories of the Space Shuttle Challenger explosion of January 1986. Research was reported concerning peoples memories for information related to the disaster, including memory for their personal circumstances surrounding how ... |
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| Laboratory Study of the Thermochemical Properties of Materials Used in Spacecraft |
04 SEP 90 |
31 pages |
| Authors:
Terry L. Thiem; Lyn R. Watson; Rainer A. Dressler; Richard H. Salter; Edmond Murad; GEOPHYSICS LAB (AFSC) HANSCOM AFB MA
|
| A high temperature mass spectrometer used to obtain laboratory data on the thermochemical properties of materials encountered in space research is described in detail. The experimental procedures and data analysis necessary to obtain thermochemical constants from the mass spectrometer data are also described. The present experimental arrangement allows cell temperatures of up to 2100 K. Reliable measurements at signal levels below 10 ion counts/s can be made because of the ... |
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| The Hazard of an Explosion of the ARIANE 5 Launcher- The Risks for the Astronauts Sitting on the Ejector Seats |
30 Aug 1990 |
17 pages |
| Authors:
M Rouze; F Laporte; CENTRE NATIONAL D'ETUDES SPATIALES TOULOUSE (FRANCE)
|
| Europeans will soon send inhabited missions into space with the Ariane 5 launcher and space shuttle Hermes combination. In case of an incident at launch, either on the pad or up to some speed after launch, it is proposed to eject the flightcrew to safety on individual ejector seats. The risks which would be confronted by the astronauts have been studied. This paper presents the development of a method for ... |
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| Final Environmental Assessment. STARLAB Program |
17 AUG 90 |
103 pages |
| Authors:
OAK RIDGE NATIONAL LAB TN
|
| This environmental assessment (EA) has been prepared by the U.S. Air Force (USAF) in compliance with the National Environment Policy Act (NEPA) and Executive Order 12114 to determine if significant environmental impacts would result from the Starlab program. The proposed action is to conduct a set engagements and experiments using electro-optical and laser systems to be installed aboard a Space Shuttle flight. The purpose of these engagements and experiments is ... |
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| Adaptive Control of Large Space Structures |
15 AUG 90 |
39 pages |
| Authors:
Robert L. Kosut; INTEGRATED SYSTEMS INC SANTA CLARA CA
|
| Preliminary results are presented for set estimation of uncertain nonlinear systems. Set estimation is a process in an adaptive robust control system which produces a set of models from the measured data. The set is then used in an on-line robust control design to implement a controller which is guaranteed to achieve performance goals for all members on the set. The scheme works whenever the actual system which produced the ... |
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| JPRS Report, Science & Technology, USSR: Space |
30 JUL 90 |
71 pages |
| Authors:
JOINT PUBLICATIONS RESEARCH SERVICE ARLINGTON VA
|
| Foreign Broadcast Information Service (FBIS) and Joint Publications Research Service (JPRS) publications contain political, military, economic, environmental, and sociological news, commentary, and other information, as well as scientific and technical data and reports. All information has been obtained from foreign radio and television broadcasts, news agency transmissions, newspapers, books, and periodicals. Items generally are processed from the first or best available sources. It should not be inferred that they have ... |
|
| Exploratory Evaluation of Alumina Ceramic Housings for Deep Submergence Service Fourth Generation Housings |
JUN 90 |
158 pages |
| Authors:
J. D. Stachiw; NAVAL OCEAN SYSTEMS CENTER SAN DIEGO CA
|
| Unmanned vehicles operating at depths in excess of 10,000 feet require for the optimization of their performance parameters (i.e., speed, range, payload, maneuverability) pressure hulls with a low weight-to- displacement ratio, preferably less than 0.5. Such low weight-to-displacement ratios cannot be achieved with metallic pressure hulls because of their low specific strengths. Aluminum oxide ceramics possess specific strength in the 82, 000 to 139,000 psi range, which is adequate for ... |
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| An Artificial Neural Network Control System for Spacecraft Attitude Stabilization |
JUN 90 |
77 pages |
| Authors:
Clement M. Segura; NAVAL POSTGRADUATE SCHOOL MONTEREY CA
|
| This document reports the results of research into the application of artificial neural networks to controlling dynamic systems. The network used is a feed-forward, fully-connected, 3-layer perception. Two methods of training neural networks via error back-propagation were used. Pattern matching training is a direct method that teaches the basic response. Performance index training is a new technique that refines the response. Performance index training is based on the concept of ... |
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| The AIS: A Spectrograph/Imager Ensemble for Space Flight |
17 MAY 90 |
62 pages |
| Authors:
R. A. Viereck; D. J. Knecht; A. L. Broadfoot; B. Sandel; GEOPHYSICS LAB (AFSC) HANSCOM AFB MA
|
| This report describes an instrument, the Arizona Imager/Spectrograph (AIS), developed for the Geophysics Laboratory by the University of Arizona for use on the space shuttle. The instrument is a combination of spectrographs and imagers intended for the study of optical emissions in the vicinity of spacecraft. It includes nine spectrographs, which cover the spectral range from 115 to 1100 nm, with spectral resolutions ranging from 0.5 nm at short wavelengths ... |
|
| Optical Test of the Space Shuttle Overhead Windows |
MAY 90 |
43 pages |
| Authors:
Harold S. Merkel; Harry L. Task; HARRY G ARMSTRONG AEROSPACE MEDICAL RESEARCH LAB WRIGHT- PATTERSON AFB OH
|
| An optical test of the space shuttle overhead windows was performed to determine how the overhead windows would affect the resolution of in-cabin telescopes such as the Spaceborne Direct-View Optical System (SpaDVOS). The test consisted of four subjects viewing a resolution target through the windows with a telescope composed of the SpaDVOS objective lens and an eyepiece. Data were recorded for three focal lengths, five aperture settings, and nine windows ... |
|
| Recovery of Images from the AMOS ELSI Data for STS-33 |
19 APR 90 |
40 pages |
| Authors:
David J. Knecht; GEOPHYSICS LAB (AFSC) HANSCOM AFB MA
|
| During the STS-33 space-shuttle mission in November 1989, ground- based observations of the shuttle were made from the Air Force Maui Optical Station (AMOS) in Hawaii during five orbits that passed near the observatory. The objective of these measurements was the study of interactions between contaminant gases of the shuttle and the residual atmosphere at orbit altitude. The Enhanced Longwave Spectral Imager (ELSI) was one of the instruments used. The ... |
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| Determination Criteria for Single Stage to Orbit |
01 APR 90 |
|
| Authors:
Douglas G. Thorpe; UNIVERSITY OF CENTRAL FLORIDA ORLANDO
|
 | The following exercise will determine the criteria for Single Stage to Orbit booster vehicles. To validate the assumptions and results several existing vehicles are examined. As a control the Manned Space Shuttle is used to calculate the equivalent orbital velocity. This velocity is then used to determine if the selected vehicle can achieve orbit and to calculate its payload capacity. |
|
| Building Blocks in Space |
APR 90 |
71 pages |
| Authors:
James D. Martens; AIR UNIV MAXWELL AFB AL AIRPOWER RESEARCH INST
|
| This study examines the role of standardization and modularity in solving operational acquisition, and supportability concerns. The author evaluates the advantages, disadvantages, and difficulties of standardizing military space systems. He examines modular construction as a method of applying standardization to future spacecraft development. Col Marten's conclusions suggest new alternatives for space vehicle construction during the next decade. |
|
| Distributed Memory Computing Conference (5th) Held in Charleston, South Carolina on April 8-12, 1990. Proceedings Volume 1. Applications |
APR 90 |
|
| Authors:
David W. Walker; Quentin F. Stout; SOUTH CAROLINA UNIV COLUMBIA
|
| Contents; Expert systems; Alternate applications; Multi target tracking; Simulation of systems and discrete events; Path planning and navigation; Data and image processing; Computer vision; Ray tracing; Sorting; Mathematical methods; Full and Banded matrix algorithms; Sparse matrix algorithms; Tridiagonal systems; Basic algorithms; Monte Carlo physics; Electromagnetic scattering problems; Plasma physics applications; Computational fluid dynamics; Other scientific applications; Structural analysis; Partial differential equation methods; Mini-symposium on concurrent simulation paradigms. |
|
| Distributed Memory Computing Conference (5th) Held in Charleston, South Carolina on April 8-12, 1990. Proceedings Volume 2. Architectures, Software Tools and Other General Issues |
APR 90 |
|
| Authors:
David W. Walker; Quentin F. Stout; SOUTH CAROLINA UNIV COLUMBIA
|
| Contents: Overviews; Dual ported memory computers; Shared memory; Other hardware and architectures; Distributed computing; Communication systems; Routing; Fault tolerance; Matrix decomposition and allocation; Data allocation and mapping; Dynamic load balancing for spatial domains; Load distribution; Data parallel programming; Object oriented programming; Automatic exploitation of parallelism; Parallel languages; Software development tools; Performance monitoring and profilling; Performance evaluation and analysis; Communication performance; Embeddings; Database and file systems; Education; Minisymposium on fault tolerance ... |
|
| Science and Technology Japan 32nd Space S&T Conference |
23 MAR 90 |
152 pages |
| Authors:
JOINT PUBLICATIONS RESEARCH SERVICE ARLINGTON VA
|
| This report contains information concerning Japan's space science and technology. Some topics include: (1) rail guns, (2) rocket propulsion, (3) rocket guidance, (4) satellite recovery, (5) space exploration, and (6) spacecraft navigation. |
|
| JPRS Report, Science & Technology, USSR: Space |
15 MAR 90 |
72 pages |
| Authors:
JOINT PUBLICATIONS RESEARCH SERVICE ARLINGTON VA
|
|
| U.S. Access to Space Launch Vehicle Choices for 1990-2010 |
MAR 90 |
|
| Authors:
Scott N. Pace; RAND CORP SANTA MONICA CA
|
| Although studies of space transportation in recent years have spanned a wide range of issues, there have been few studies that compare both means and ends. This report evaluates launch vehicle combinations capable of meeting a range of U.S. space traffic needs between 1990 and 2010. The evaluation aims to clarify alternatives available to the United States in pursuing potential national goals and to increase understanding of the implications of ... |
|
| Defense Science Board 1989 Summer Study on National Space Launch Strategy |
MAR 90 |
92 pages |
| Authors:
DEFENSE SCIENCE BOARD WASHINGTON DC
|
| This report addresses the shortfalls in the current National Space Launch Strategy as it applies to the Department of Defense, DoD's relationship with NASA and in particular the shuttle, and the Vandenburg AFB Shuttle Complex. The report recommends the redirection of the Advanced Launch System (ALS) program away from the development of family of launch vehicle's to a joint technology program with NASA. It also recommends continued DoD support for ... |
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| End-to-End Control System Verification of the STARLAB Experiment |
03 FEB 1990 |
|
| Authors:
Dan Herrick; Jack Rodden; Paul Shirley; AMERICAN ASTRONAUTICAL SOCIETY SAN DIEGO CA ROCKY MOUNTAIN SECTION
|
| This paper describes an electro-optical tracking and beam control system simulation used to analyze the performance for the space shuttle based STARLAB experiment hardware. STARLAB is to provide an on orbit demonstration of acquisition, tracking and pointing (ATP) techniques critical to strategic defense directed energy concepts. In particular, a target booster will be optically tracked from launch to re-entry. This rocket will be instrumented to "score'1 how accurately a laser ... |
|
| Implications of Advanced Technologies for Air and Spacecraft Escape |
FEB 90 |
|
| Authors:
ADVISORY GROUP FOR AEROSPACE RESEARCH AND DEVELOPMENT NEUILLY-SUR-SEINE (FRAN CE)
|
| This Symposium addressed the latest technological advances in all areas which affect overall escape system performance and capabilities. Escapes from hypersonic vehicles and spacecraft were also considered. Partial contents: Development of acceleration exposure limits for advanced escape systems; Development of an ejection seat specification for a new fighter aircraft; Escape system research at RAE; Fighter escape systems -- The next step forward; Potential role of avionics in escape systems; Ejection ... |
|
| Effects of Thruster Firings on the Shuttle Environment 1: Neutral Gas Composition |
19 JAN 90 |
30 pages |
| Authors:
Donald E. Hunton; GEOPHYSICS LAB (AFSC) HANSCOM AFB MA
|
| The changes in the neutral gas composition surrounding the Space Shuttle caused by the Shuttle's Vernier Reaction Control System (VRCS) and Orbital Maneuvering System (OMS) rocket engines were measured with a quadrupole mass spectrometer aboard STS-4. There are substantial differences between the measured composition changes in the payload bay and the calculated composition of the thruster exhaust plumes. These differences can be explained by kinematic effects that occur as the ... |
|
| Sensitivity Analysis with a Simple Charging Code |
JAN 90 |
25 pages |
| Authors:
A. J. Sims; G. L. Wrenn; ROYAL AEROSPACE ESTABLISHMENT FARNBOROUGH (UNITED KINGDOM)
|
| Computer simulation techniques using codes such as NASCAP have proved very successful in tracking the spacecraft charging problem. Although a full dynamic three-dimensional code is required to model a spacecraft in orbit, simpler codes (eg MATCHG) can do much to clarify the interaction between the environment and a surface. It is difficult to obtain complete data on either the incident particle fluxes or the material properties which determine the various ... |
|
| Reduction of 3-Methoxytyramine Concentrations in the Caudate Nucleus of Rats after Exposure to High-Energy Iron Particles: Evidence for Deficits in Dopaminergic Neurons |
Jan 1990 |
7 pages |
| Authors:
Walter A Hunt; Thomas K Dalton; James A Joseph; Bernard M Rabin; ARMED FORCES RADIOBIOLOGY RESEARCH INST BETHESDA MD
|
| The prospect of long-term space travel raises a number of questions about the safety of astronauts asked to venture on prolonged journeys. The problems of microgravity are well known, but the hazards of exposure to radiation are less unknown, but the hazards of exposure to radation are less understood. Most space travel has involved a few days to many months in low- altitude, equatorial orbits, where the dangers of radiation ... |
|
| JPRS Report Science & Technology Japan Space Artificial Intelligence/ Robotics/Automation Symposium |
28 DEC 1989 |
107 pages |
| Authors:
JOINT PUBLICATIONS RESEARCH SERVICE ARLINGTON VA
|
| This report from Japan contains articles on Space Artificial Intelligence/Robotics/automation presented at the 2nd SAIRAS in Japan. |
|
| Sensitivity of Space System Availability Predictions to Underlying Component Reliability Estimates |
DEC 89 |
193 pages |
| Authors:
James R. Wolf; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
|
| Space system availability prediction is the precess of estimating the likelihood that a space system will be available to perform its assigned mission, as a function of time. The ability to make these predictions accurately is fundamental to the efficient employment of Air Force resources. Availability prediction is based on the estimated reliability of individual spacecraft and the components of which they are comprised. This study made use of response ... |
|
| Robustness of a Moving-Bank Multiple Model Adaptive Controller for a Large Space Structure |
DEC 89 |
|
| Authors:
Michael R. Schore; AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
|
| The robustness of moving-bank multiple model adaptive estimation (MMAE) and control (MMAC) algorithms is analyzed in this thesis. The mismatch of a 24-state truth model and a 6-state filter model are evaluated on the basis of MMAE/MMAC performance. A model developed using finite element analysis is used to approximate a large space structure which has a large central hub with appendages radiating out from it. The mass of the hub ... |
|
| JPRS Report, Science and Technology, USSR: Space |
22 NOV 89 |
76 pages |
| Authors:
JOINT PUBLICATIONS RESEARCH SERVICE ARLINGTON VA
|
| This document contains translated articles from various Russian language periodicals concerning the Soviet Union and space technology. Other topics discussed are space sciences, space missions, life sciences, space engineering, and space applications. |
|
| Proceedings of the Spacecraft Charging Technology Conference Held in Monterey, California on 31 October - 3 November 1989. Volume 1 |
NOV 89 |
342 pages |
| Authors:
R. C. Olsen; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF PHYSICS
|
| The Spacecraft Charging Technology Conference was held at the Naval Postgraduate School, Monterey, California, from 31 October to 3 November 1989. This was the fifth in a series of meetings jointly sponsored by the Air Force and NASA to deal with spacecraft environment interactions. The meeting was attended by 108 people with 60 talks presented. The majority of the speakers have chosen to present their work in these two volumes. ... |
|
| Proceedings of the Spacecraft Charging Technology Conference Held in Monterey, California on 31 October - 3 November 1989. Volume 2 |
NOV 89 |
300 pages |
| Authors:
R. C. Olsen; NAVAL POSTGRADUATE SCHOOL MONTEREY CA DEPT OF PHYSICS
|
| The Spacecraft Charging Technology Conference was held at the Naval Postgraduate School, Monterey, California, from 31 October to 3 November 1989. This was the fifth in a series of meetings jointly sponsored by the Air Force and NASA to deal with spacecraft environment interactions. The Meeting was attended by 108 people with 60 talks presented. The majority of the speakers have chosen to present their work in these two volumes. ... |
|
| Manned Spacecraft |
14 SEP 89 |
375 pages |
| Authors:
A. N. Ponomarev; FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OH
|
| The book discusses the Soviet spacecraft of the type 'Vostok', 'Voskhod', and about American ships 'Mercury', Gemini', and 'Apollo', which are intended to be used for the delivery of man to the Moon; about future spacecraft for flight to other planets of solar system; orbital flight vehicles, intended for studying space, engines of space vehicles, are examined. In book the problems, which appear with mastery/adoption of outer space, are briefly ... |
|
| SCATHA (Spacecraft Charging at High Altitudes) Atlas Data Base. Volume 1 |
01 SEP 89 |
201 pages |
| Authors:
E. G. Mullen; M. S. Gussenhoven; GEOPHYSICS LAB (AFSC) HANSCOM AFB MA
|
| A study of the plasma environment encountered by the P78-2 Spacecraft Charging At High Altitudes (SCATHA) satellite during its operation between March 1979 and June 1980 was conducted and reported in the SCATHA Environmental Atlas (AFGL-TR-83-0002). Summary plots of much of the data used in the Atlas are presented in two volumes. The first volume contains magnetic field data and spacecraft frame potential data. The second volume contains low and ... |
|
| SCATHA (Spacecraft Charging at High Altitudes) Atlas Data Base. Volume 2 |
01 SEP 89 |
285 pages |
| Authors:
E. G. Mullen; M. S. Gussenhoven; GEOPHYSICS LAB (AFSC) HANSCOM AFB MA
|
| A study of the plasma environment encountered by the P78-2 Spacecraft Charging At High Altitudes (SCATHA) satellite during its operation between March 1979 and June 1980 was conducted and reported in the SCATHA Environmental Atlas (AFGL-TR-84-0002). Summary plots of much of the data used in the Atlas are presented in two volumes. The first volume contains magnetic field data and spacecraft frame potential data. The second volume contains low and ... |
|
| Reliability Analysis of the Space Station Freedom Electrical Power System |
AUG 89 |
158 pages |
| Authors:
Michael C. Talbott; CASE WESTERN RESERVE UNIV CLEVELAND OH DEPT OF SYSTEMS ENGINEERING
|
| The on-board electrical power system of a space station has to provide the power needed for scientific missions (discretionary loads) and everyday station housekeeping chores (non-discretionary loads). Due to size constraints of the spacecraft, the electrical power system's output, efficiency and reliability will be constrained producing a system that is imperfect. This thesis applies traditional reliability techniques and modified methods to evaluate the reliability of the proposed NASA Space Station ... |
|
| Conference Proceedings of NASA/DoD Controls-Structures Interaction Technology Held in San Diego, California on 29 January-2 February 1989 |
AUG 89 |
558 pages |
| Authors:
Jerry R. Newsom; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| Partial contents: Vibration isolation versus vibration compensation on multiple payload platforms; Controlled multibody dynamics simulation for large space structures; A distributed finite element modeling and control approach for large flexible structures; effective techniques for the identification and accommodation of disturbances; Modeling and control of flexible space platforms with articulated payloads; computational architecture for integrated controls and structures design; Recent experience in simultaneous control structure optimization; An air bearing weight offload ... |
|
| French Spaceplane - HERMES Update |
14 JUL 89 |
|
| Authors:
OFFICE OF NAVAL RESEARCH EUROPEAN OFFICE FPO NEW YORK 09510
|
| This report presents a brief description of one of the more interesting and significant aerospace developments displayed at the Paris Air Show for 9-18 June 1989. The HERMES is the ESA supported reusable manned spaceplane. The HERMES has undergone a drastic redesign since last year to meet mission requirements and those arising from the capabilities of the Ariane 5 heavy lift launch vehicle. The most significant change to HERMES is ... |
|
| European Hypersonic Technology Programs Update |
13 JUL 89 |
2 pages |
| Authors:
OFFICE OF NAVAL RESEARCH EUROPEAN OFFICE FPO NEW YORK 09510
|
|
| Multivariable Methods for the Design, Identification, and Control of Large Space Structures. Volume 1. Estimator Eigenvalue Placement in Positive Real Design |
JUL 89 |
36 pages |
| Authors:
G. L. Slater; M. D. McLaren; CINCINNATI UNIV OH DEPT OF AEROSPACE ENGINEERING AND ENGINEERING MECHANICS
|
| The objective of this contract was to develop mathematical algorithms for the integration of structural dynamics and controls with particular reference to the design of large space structures. A numerical technique is presented to place the eigenvalues of the estimator in a positive real control environment. The estimator is based on a reduced-order model of the full system. The technique involves posing the problem as a constrained optimization problem. Two ... |
|
| Multivariable Methods for the Design, Identification, and Control of Large Space Structures. Volume 3. A Study of the Integrated Control/Structure Design Optimization Problem for Large Flexible Structures |
JUL 89 |
101 pages |
| Authors:
M. D. McLaren; G. L. Slater; CINCINNATI UNIV OH DEPT OF AEROSPACE ENGINEERING AND ENGINEERING MECHANICS
|
| A comparison of optimal and suboptimal estimation applied to large flexible structures under perfect and imperfect model information conditions is presented. The filters estimate the modal positions and velocities of a simple pinned-pinned beam. Among the types of estimators investigated are full and reduced-order centralized estimators, reduced-order decentralized estimators, and one-mode and two-mode sensitivity-shaped estimators. The suboptimal estimators are shown to have lower position rms error values than the optimal ... |
|
| Expandable Radiator. |
27 JUN 1989 |
|
| Authors:
Donald L. Reinmuller; DEPARTMENT OF THE AIR FORCE WASHINGTON DC
|
| An expandable heat rejection system for radiating heat from a source of heat on a spacecraft or like vehicle is described and comprises a fluid heat exchange medium in operative circulating heat exchange relationship with the source for absorbing heat by evaporation of a liquid phase or the medium, an elongate inflatable sleeve defining an expandable and collapsible volume closed at a first end and including an inlet and outlet ... |
|
| Thermal Protection System of the Space Shutt1e |
JUN 89 |
294 pages |
| Authors:
John Cleland; Francesco Iannetti; RESEARCH TRIANGLE INST RESEARCH TRIANGLE PARK NC
|
| The Thermal Protection System (TPS) of the Space Shuttle is one of the most important and successful accomplishments of the National Aeronautics and Space Administration. The TPS introduced and continues to incorporate many of the advances in materials over the past two decades. This review provides a comprehensive, single-volume summary of the TPS, including system design rationales, key design features, and broad descriptions of the subsystems of TPS (e.g., reusable ... |
|
| Spacecraft Interactions as Influenced by Thermochemical Considerations |
JUN 1989 |
7 pages |
| Authors:
Edmond Murad; AIR FORCE SYSTEMS COMMAND HANSCOM AFB MA GEOPHYSICS LAB
|
| Spacecraft in low Earth orbit undergo harsh environmental interactions that sometimes resemble the phenomenon observed in high-temperature vaporization and oxidation. For example, it has been reported that an osmium surface is removed, and surfaces of aluminum, silver, copper, iridium, niobium, nickel, and tungsten, are oxidized, even though the surface temperature when the measurements are made is -250 K. Similar results are observed for the case of nonmetallic samples, e.g., graphite ... |
|
| Fluid Lock. |
09 MAY 1989 |
|
| Authors:
William E. Haynes; DEPARTMENT OF THE AIR FORCE WASHINGTON DC
|
| This fluid lock permits transiting an object between different fluid pressure through a transiting hole in a wall separating a higher fluid pressure side from a lower fluid pressure side on opposite sides of the wall; has higher and lower fluid pressure doors, each hinged for pivotal movement between an open position for permitting transiting through the hole from one to the other pressure side and a closed position for ... |
|
| NASA/SDIO Space Environmental Effects on Materials Workshop Held in Hampton, Virginia on June 28-July 1, 1988. Part 2 |
MAY 89 |
254 pages |
| Authors:
Louis A. Teichman; Bland A. Stein; NATIONAL AERONAUTICS AND SPACE ADMINISTRATION HAMPTON VA LANGLEY RESEARCH CEN TER
|
| The National Aeronautics and Space Administration (NASA) and the Strategic Defense Initiative Organization (SDIO) cosponsored a workshop on Space Environmental Effects on Materials at the NASA Langley Research Center from June 28 to July 1, 1988. The joint workshop was designed to inform participants of the present state of knowledge regarding space environmental effects on materials and to identify knowledge gaps that prevent informed decisions on the best use of ... |
|
| Autonomous Frequency Domain Identification: Theory and Experiment |
15 APR 89 |
217 pages |
| Authors:
Y. Yam; D. S. Bayard; F. Y. Hadaegh; E. Mettler; M. H. Milman; JET PROPULSION LAB PASADENA CA
|
| The analysis, design, and on-orbit tuning of robust controllers require more information about the plant than simply a nominal estimate of the plant transfer function. Information is also required concerning the uncertainty in the nominal estimate, or more generally, the identification of a model set within which the true plant is known to lie. The identification methodology that was developed and experimentally demonstrated makes use of a simple but useful ... |
|
| U.S. Army Role in Space |
12 APR 89 |
36 pages |
| Authors:
Joseph R. Nowland; ARMY WAR COLL CARLISLE BARRACKS PA
|
| The future battlefield has been described as non-linear, chaotic, intense and highly lethal. To fight and win in this environment, the Army as developed the AirLand Battle Doctrine, which relies heavily on the fundamental tenets of initiative, agility, depth, and synchronization as it fights the close, deep and rear battle. Our current terrestrial intelligence and communications systems alone do not provide the sufficiency of connectivity, reliability and capacity to meet ... |
|
Manned Spacecraft
