DOCSLIB.ORG

An Analysis and a Historical Review of the Apollo Program Lunar Module Touchdown Dynamics

Total Page：16

File Type：pdf, Size：1020Kb

Download full-text PDF Read full-text
An Analysis and a Historical Review of the Apollo Program Lunar Module Touchdown Dynamics NASA/SP-2013-605 An Analysis and a Historical Review of the Apollo Program Lunar Module Touchdown Dynamics George A. Zupp, PhD Engineering Directorate, Retired Structural Engineering Division NASA Johnson Space Center, Houston, TX 77058 January 2013 NASA STI Program ... in Profile Since its founding, NASA has been dedicated CONFERENCE PUBLICATION. to the advancement of aeronautics and space Collected papers from scientific and science. The NASA scientific and technical technical conferences, symposia, information (STI) program plays a key part in seminars, or other meetings sponsored helping NASA maintain this important role. or co-sponsored by NASA. The NASA STI program operates under the SPECIAL PUBLICATION. Scientific, auspices of the Agency Chief Information technical, or historical information from Officer. It collects, organizes, provides for NASA programs, projects, and missions, archiving, and disseminates NASA’s STI. The often concerned with subjects having NASA STI program provides access to the substantial public interest. NASA Aeronautics and Space Database and its public interface, the NASA Technical Report TECHNICAL TRANSLATION. Server, thus providing one of the largest English-language translations of foreign collections of aeronautical and space science scientific and technical material pertinent to STI in the world. Results are published in both NASA’s mission. non-NASA channels and by NASA in the NASA STI Report Series, which includes the Specialized services also include organizing following report types: and publishing research results, distributing specialized research announcements and feeds, TECHNICAL PUBLICATION. Reports of providing help desk and personal search completed research or a major significant support, and enabling data exchange services. phase of research that present the results of NASA Programs and include extensive data For more information about the NASA STI or theoretical analysis. Includes compila- program, see the following: tions of significant scientific and technical data and information deemed to be of Access the NASA STI program home page continuing reference value. NASA counter- at http://www.sti.nasa.gov part of peer-reviewed formal professional papers but has less stringent limitations on E-mail your question via the Internet to manuscript length and extent of graphic [email protected] presentations. Fax your question to the NASA STI Help TECHNICAL MEMORANDUM. Desk at 443-757-5803 Scientific and technical findings that are preliminary or of specialized interest, Phone the NASA STI Help Desk at e.g., quick release reports, working 443-757-5802 papers, and bibliographies that contain minimal annotation. Does not contain Write to: extensive analysis. NASA STI Help Desk NASA Center for AeroSpace Information CONTRACTOR REPORT. Scientific and 7115 Standard Drive technical findings by NASA-sponsored Hanover, MD 21076-1320 contractors and grantees. NASA/SP-2013-605 An Analysis and a Historical Review of the Apollo Program Lunar Module Touchdown Dynamics George A. Zupp, PhD Engineering Directorate, Retired Structural Engineering Division NASA Johnson Space Center, Houston, TX 77058 January 2013 Available from: NASA Center for AeroSpace Information National Technical Information Service 7115 Standard Drive 5285 Port Royal Road Hanover, MD 21076-1320 Springfield, VA 22161 301-621-0390 703-605-6000 This report is also available in electronic form at http://ston.jsc.nasa.gov/collections/TRS Table of Contents List of Figures ................................................................................................................................. ii List of Tables .................................................................................................................................. v Acknowledgments.......................................................................................................................... vi Summary ......................................................................................................................................... 1 1.0 Introduction .......................................................................................................................... 1 2.0 Landing Dynamic Analysis.................................................................................................. 3 3.0 Drop Testing of Subscale and Full-scale Lunar Module Models ........................................ 5 4.0 The Lunar Module ............................................................................................................... 6 5.0 Critical Design Cases ......................................................................................................... 10 6.0 Analysis of the Apollo 11 Lunar Module Landing Dynamics and Lunar Surface Mechanical Properties ........................................................................................................ 11 7.0 The Apollo Lunar Module Landings ................................................................................. 13 7.1 Apollo 11 Lunar Landing ............................................................................................... 13 7.1.1 Summary: Apollo 11 Lunar Module Landing ......................................................... 22 7.2 Apollo 12 Lunar Landing ............................................................................................... 23 7.2.1 Summary: Apollo 12 Lunar Module Landing ......................................................... 31 7.3 Apollo 13 Lunar Landing (Aborted) .............................................................................. 31 7.4 Apollo 14 Lunar Landing ............................................................................................... 31 7.4.1 Summary: Apollo 14 Lunar Module Landing ......................................................... 43 7.5 Apollo 15 Lunar Landing ............................................................................................... 43 7.5.1 Summary: Apollo 15 Lunar Module Landing ......................................................... 52 7.6 Apollo 16 Lunar Landing ............................................................................................... 52 7.6.1 Summary: Apollo 16 Lunar Module Landing ......................................................... 58 7.7 Apollo 17 Lunar Landing ............................................................................................... 58 7.7.1 Summary: Apollo 17 Lunar Module Landing ......................................................... 63 8.0 Author's Annotation – Apollo 16 and 17 Landings ........................................................... 63 9.0 Conclusions ........................................................................................................................ 64 10.0 References .......................................................................................................................... 66 Appendix A: Apollo 11 Lunar Module Touchdown Dynamics ................................................... 67 Appendix B: Lunar Soil Mechanical Properties Model ................................................................ 75 Appendix C: Apollo 11 Lunar Module Mass Properties at Touchdown ...................................... 81 Appendix D: Apollo 11 Lunar Module Landing Gear Load Stroke Characteristics .................... 82 Appendix E: Apollo 11 Lunar Module Descent Engine Thrust Tail-off Characteristics ............. 84 i List of Figures Figure 1. Inverted Tripod design ................................................................................................................ 3 Figure 2. Cantilever design ........................................................................................................................ 4 Figure 3. Body coordinate system of Lunar Module with noted key dimensions for the Cantilever landing gear configuration. ......................................................................................................... 7 Figure 4. Final Lunar Module configuration that landed on the moon, and the attachment location of the four Cantilever-type landing gears to the descent stage. ................................................. 8 Figure 5. Lunar Module landing touchdown velocity envelope and landing gear energy absorption performance. ............................................................................................................................. 10 Figure 6. Apollo 11 Lunar Module pitch rate as a function of time. ....................................................... 14 Figure 7. Apollo 11 Lunar Module roll rate as a function of time. ......................................................... 14 Figure 8. Apollo 11 Lunar Module yaw rate as a function of time. ........................................................ 15 Figure 9. Composite of Apollo 11 Lunar Module rotational rates during the touchdown maneuver....... 16 Figure 10. (NASA Photograph AS11-40-5915) Overall view of Apollo 11 Lunar Module resting on lunar surface. ............................................................................................................................ 17 Figure 11. (NASA Photograph AS11-40-5864) Closeup view of Apollo 11 Lunar Module descent engine nozzle bell and the +Z landing gear. ............................................................................ 18 Figure 12. (NASA Photograph AS11-40-5858) Apollo 11 Lunar Module +Y landing gear and footpad, looking from the area of the +Z footpad location
Load more

Recommended publications
  • No. 40. the System of Lunar Craters, Quadrant Ii Alice P
    NO. 40. THE SYSTEM OF LUNAR CRATERS, QUADRANT II by D. W. G. ARTHUR, ALICE P. AGNIERAY, RUTH A. HORVATH ,tl l C.A. WOOD AND C. R. CHAPMAN \_9 (_ /_) March 14, 1964 ABSTRACT The designation, diameter, position, central-peak information, and state of completeness arc listed for each discernible crater in the second lunar quadrant with a diameter exceeding 3.5 km. The catalog contains more than 2,000 items and is illustrated by a map in 11 sections. his Communication is the second part of The However, since we also have suppressed many Greek System of Lunar Craters, which is a catalog in letters used by these authorities, there was need for four parts of all craters recognizable with reasonable some care in the incorporation of new letters to certainty on photographs and having diameters avoid confusion. Accordingly, the Greek letters greater than 3.5 kilometers. Thus it is a continua- added by us are always different from those that tion of Comm. LPL No. 30 of September 1963. The have been suppressed. Observers who wish may use format is the same except for some minor changes the omitted symbols of Blagg and Miiller without to improve clarity and legibility. The information in fear of ambiguity. the text of Comm. LPL No. 30 therefore applies to The photographic coverage of the second quad- this Communication also. rant is by no means uniform in quality, and certain Some of the minor changes mentioned above phases are not well represented. Thus for small cra- have been introduced because of the particular ters in certain longitudes there are no good determi- nature of the second lunar quadrant, most of which nations of the diameters, and our values are little is covered by the dark areas Mare Imbrium and better than rough estimates.
    [Show full text]
  • Glossary Glossary
    Glossary Glossary Albedo A measure of an object’s reflectivity. A pure white reflecting surface has an albedo of 1.0 (100%). A pitch-black, nonreflecting surface has an albedo of 0.0. The Moon is a fairly dark object with a combined albedo of 0.07 (reflecting 7% of the sunlight that falls upon it). The albedo range of the lunar maria is between 0.05 and 0.08. The brighter highlands have an albedo range from 0.09 to 0.15. Anorthosite Rocks rich in the mineral feldspar, making up much of the Moon’s bright highland regions. Aperture The diameter of a telescope’s objective lens or primary mirror. Apogee The point in the Moon’s orbit where it is furthest from the Earth. At apogee, the Moon can reach a maximum distance of 406,700 km from the Earth. Apollo The manned lunar program of the United States. Between July 1969 and December 1972, six Apollo missions landed on the Moon, allowing a total of 12 astronauts to explore its surface. Asteroid A minor planet. A large solid body of rock in orbit around the Sun. Banded crater A crater that displays dusky linear tracts on its inner walls and/or floor. 250 Basalt A dark, fine-grained volcanic rock, low in silicon, with a low viscosity. Basaltic material fills many of the Moon’s major basins, especially on the near side. Glossary Basin A very large circular impact structure (usually comprising multiple concentric rings) that usually displays some degree of flooding with lava. The largest and most conspicuous lava- flooded basins on the Moon are found on the near side, and most are filled to their outer edges with mare basalts.
    [Show full text]
  • Apollo Spacecraft
    APOLLO NEWS REFERENCE APOLLO SPACECRAFT The Apollo spacecraft comprises the lunar occupies the right flight station. The astronauts module, the command module, theservice module, transfer to the ascent stage, through the docking the spacecraft-lunar module adapter, and the tunne l, after the LM has docked with the CM and launch escape system. The five parts, 82 feet tall both have attained lunar orbit. The ascent stage when assembled, are carried atop the launch comprises three major areas: crew compartment, vehicle. midsection, and aft equipment bay. The cabin, comprising the crew compartment and midsection, After the launch escape system and the launch has an overa ll volume of 235 cubic feet. vehicle have been jettisoned, the three modu les remain to form the basic spacecraft. The command module carries the three astronauts to and from Because the LM is operated in either the weight­ lunar orbit. The service modu le contains the pro­ lessness of space or in lunar gravity, the cabin pulsion system that propels the spacecraft during contains harness- like restraint equipment rather the trans lunar and transearth flights. The lunar than the foldable couches provided in the CM. The module carries two astronauts, the Commander restraints al low the astronauts sufficient freedom and the Lunar Module Pilot, to and from the of movement to operate al l LM controls while in a moon, and serves as the base of operations during re lativelyupright position. the lunar stay. LUNAR MODULE The lunar module wil l be operated in the vacuum of space; there was no need, therefore,for it to have the aerodynamic symmetry of the com· mand module.
    [Show full text]
  • PEANUTS and SPACE FOUNDATION Apollo and Beyond
    Reproducible Master PEANUTS and SPACE FOUNDATION Apollo and Beyond GRADE 4 – 5 OBJECTIVES PAGE 1 Students will: ö Read Snoopy, First Beagle on the Moon! and Shoot for the Moon, Snoopy! ö Learn facts about the Apollo Moon missions. ö Use this information to complete a fill-in-the-blank fact worksheet. ö Create mission objectives for a brand new mission to the moon. SUGGESTED GRADE LEVELS 4 – 5 SUBJECT AREAS Space Science, History TIMELINE 30 – 45 minutes NEXT GENERATION SCIENCE STANDARDS ö 5-ESS1 ESS1.B Earth and the Solar System ö 3-5-ETS1 ETS1.B Developing Possible Solutions 21st CENTURY ESSENTIAL SKILLS Collaboration and Teamwork, Communication, Information Literacy, Flexibility, Leadership, Initiative, Organizing Concepts, Obtaining/Evaluating/Communicating Ideas BACKGROUND ö According to NASA.gov, NASA has proudly shared an association with Charles M. Schulz and his American icon Snoopy since Apollo missions began in the 1960s. Schulz created comic strips depicting Snoopy on the Moon, capturing public excitement about America’s achievements in space. In May 1969, Apollo 10 astronauts traveled to the Moon for a final trial run before the lunar landings took place on later missions. Because that mission required the lunar module to skim within 50,000 feet of the Moon’s surface and “snoop around” to determine the landing site for Apollo 11, the crew named the lunar module Snoopy. The command module was named Charlie Brown, after Snoopy’s loyal owner. These books are a united effort between Peanuts Worldwide, NASA and Simon & Schuster to generate interest in space among today’s younger children.
    [Show full text]
  • A Comparative Analysis of the Geology Tools Used During the Apollo Lunar Program and Their Suitability for Future Missions to the Om on Lindsay Kathleen Anderson
    University of North Dakota UND Scholarly Commons Theses and Dissertations Theses, Dissertations, and Senior Projects January 2016 A Comparative Analysis Of The Geology Tools Used During The Apollo Lunar Program And Their Suitability For Future Missions To The oM on Lindsay Kathleen Anderson Follow this and additional works at: https://commons.und.edu/theses Recommended Citation Anderson, Lindsay Kathleen, "A Comparative Analysis Of The Geology Tools Used During The Apollo Lunar Program And Their Suitability For Future Missions To The oonM " (2016). Theses and Dissertations. 1860. https://commons.und.edu/theses/1860 This Thesis is brought to you for free and open access by the Theses, Dissertations, and Senior Projects at UND Scholarly Commons. It has been accepted for inclusion in Theses and Dissertations by an authorized administrator of UND Scholarly Commons. For more information, please contact [email protected]. A COMPARATIVE ANALYSIS OF THE GEOLOGY TOOLS USED DURING THE APOLLO LUNAR PROGRAM AND THEIR SUITABILITY FOR FUTURE MISSIONS TO THE MOON by Lindsay Kathleen Anderson Bachelor of Science, University of North Dakota, 2009 A Thesis Submitted to the Graduate Faculty of the University of North Dakota in partial fulfillment of the requirements for the degree of Master of Science Grand Forks, North Dakota May 2016 Copyright 2016 Lindsay Anderson ii iii PERMISSION Title A Comparative Analysis of the Geology Tools Used During the Apollo Lunar Program and Their Suitability for Future Missions to the Moon Department Space Studies Degree Master of Science In presenting this thesis in partial fulfillment of the requirements for a graduate degree from the University of North Dakota, I agree that the library of this University shall make it freely available for inspection.
    [Show full text]
  • EDL – Lessons Learned and Recommendations
    ."#!(*"# 0 1(%"##" !)"#!(*"#* 0 1"!#"("#"#(-$" ."!##("""*#!#$*#( "" !#!#0 1%"#"! /!##"*!###"#" #"#!$#!##!("""-"!"##&!%%!%&# $!!# %"##"*!%#'##(#!"##"#!$$# /25-!&""$!)# %"##!""*&""#!$#$! !$# $##"##%#(# ! "#"-! *#"!,021 ""# !"$!+031 !" )!%+041 #!( !"!# #$!"+051 # #$! !%#-" $##"!#""#$#$! %"##"#!#(- IPPW Enabled International Collaborations in EDL – Lessons Learned and Recommendations: Ethiraj Venkatapathy1, Chief Technologist, Entry Systems and Technology Division, NASA ARC, 2 Ali Gülhan , Department Head, Supersonic and Hypersonic Technologies Department, DLR, Cologne, and Michelle Munk3, Principal Technologist, EDL, Space Technology Mission Directorate, NASA. 1 NASA Ames Research Center, Moffett Field, CA [email protected]. 2 Deutsches Zentrum für Luft- und Raumfahrt e.V. (DLR), German Aerospace Center, [email protected] 3 NASA Langley Research Center, Hampron, VA. [email protected] Abstract of the Proposed Talk: One of the goals of IPPW has been to bring about international collaboration. Establishing collaboration, especially in the area of EDL, can present numerous frustrating challenges. IPPW presents opportunities to present advances in various technology areas. It allows for opportunity for general discussion. Evaluating collaboration potential requires open dialogue as to the needs of the parties and what critical capabilities each party possesses. Understanding opportunities for collaboration as well as the rules and regulations that govern collaboration are essential. The authors of this proposed talk have explored and established collaboration in multiple areas of interest to IPPW community. The authors will present examples that illustrate the motivations for the partnership, our common goals, and the unique capabilities of each party. The first example involves earth entry of a large asteroid and break-up. NASA Ames is leading an effort for the agency to assess and estimate the threat posed by large asteroids under the Asteroid Threat Assessment Project (ATAP).
    [Show full text]
  • Jjmonl 1603.Pmd
    alactic Observer GJohn J. McCarthy Observatory Volume 9, No. 3 March 2016 GRAIL - On the Trail of the Moon's Missing Mass GRAIL (Gravity Recovery and Interior Laboratory) was a NASA scientific mission in 2011/12 to map the surface of the moon and collect data on gravitational anomalies. The image here is an artist's impres- sion of the twin satellites (Ebb and Flow) orbiting in tandem above a gravitational image of the moon. See inside, page 4 for information on gravitational anomalies (mascons) or visit http://solarsystem. nasa.gov/grail. The John J. McCarthy Observatory Galactic Observer New Milford High School Editorial Committee 388 Danbury Road Managing Editor New Milford, CT 06776 Bill Cloutier Phone/Voice: (860) 210-4117 Production & Design Phone/Fax: (860) 354-1595 www.mccarthyobservatory.org Allan Ostergren Website Development JJMO Staff Marc Polansky It is through their efforts that the McCarthy Observatory Technical Support has established itself as a significant educational and Bob Lambert recreational resource within the western Connecticut Dr. Parker Moreland community. Steve Barone Jim Johnstone Colin Campbell Carly KleinStern Dennis Cartolano Bob Lambert Mike Chiarella Roger Moore Route Jeff Chodak Parker Moreland, PhD Bill Cloutier Allan Ostergren Cecilia Dietrich Marc Polansky Dirk Feather Joe Privitera Randy Fender Monty Robson Randy Finden Don Ross John Gebauer Gene Schilling Elaine Green Katie Shusdock Tina Hartzell Paul Woodell Tom Heydenburg Amy Ziffer In This Issue "OUT THE WINDOW ON YOUR LEFT" ............................... 4 SUNRISE AND SUNSET ...................................................... 13 MARE HUMBOLDTIANIUM AND THE NORTHEAST LIMB ......... 5 JUPITER AND ITS MOONS ................................................. 13 ONE YEAR IN SPACE ....................................................... 6 TRANSIT OF JUPITER'S RED SPOT ....................................
    [Show full text]
  • Conceptual Human-System Interface Design for a Lunar Access Vehicle
    Conceptual Human-System Interface Design for a Lunar Access Vehicle Mary Cummings Enlie Wang Cristin Smith Jessica Marquez Mark Duppen Stephane Essama Massachusetts Institute of Technology* Prepared For Draper Labs Award #: SC001-018 PI: Dava Newman HAL2005-04 September, 2005 http://halab.mit.edu e-mail: [email protected] *MIT Department of Aeronautics and Astronautics, Cambridge, MA 02139 TABLE OF CONTENTS 1 INTRODUCTION..................................................................................................... 1 1.1 THE GENERAL FRAMEWORK................................................................................ 1 1.2 ORGANIZATION.................................................................................................... 2 2 H-SI BACKGROUND AND MOTIVATION ........................................................ 3 2.1 APOLLO VS. LAV H-SI........................................................................................ 3 2.2 APOLLO VS. LUNAR ACCESS REQUIREMENTS ...................................................... 4 3 THE LAV CONCEPTUAL PROTOTYPE............................................................ 5 3.1 HS-I DESIGN ASSUMPTIONS ................................................................................ 5 3.2 THE CONCEPTUAL PROTOTYPE ............................................................................ 6 3.3 LANDING ZONE (LZ) DISPLAY............................................................................. 8 3.3.1 LZ Display Introduction.................................................................................
    [Show full text]
  • PSAD-81-2 Support Service Contracting at Johnson Space
    BY THEU.S. GENERAL ACCOUNTli’JG OFFICE Report To The Administrator, National Aeronautics And Space Administration S@pportService Contracting At Johnson Space Center Needs Strengthening T National Aeronautics and S ace Administration Sl about $175 million annual Py on support service Cl at Johnson Space Center. GAO tested the way si of these contracts are administered and found --a contractor was working without approved llllllllllllllll113606 work orders, --Government-furnished equipment was unac- counted for, --questionable reimbursements occurred for con- tractor costs, I --contract funds increased before the need was justified, I --contracting officers were unaware of their re- sponsibilitres and unfamiliar with contract terms, and I --some contracting officers had a general attitude that small dollar value contracts are not worthy of adequate attention. I ‘/A0 believes overreliance on cost-type contracts which quire greater administration efforts than fixed-price )ntracts contributes to these contracting weaknesses recommends that the National Aeronautics and ace Administration take corrective actions. mp81s2 OCTOBER 21,1900 + Request for copies of GAO reports should be sent to: U.S. General Accounting Office Document Handling and Information Services Facility P.O. Box 6015 Gaithersburg, Md. 20760 Telephone (202) 275-6241 The first five copies of individual reports are free of charge. Additional copies of bound audit reports are $3.25 each. Additional copies of unbound report (i.e., letter reports) and most other publications are $1.00 each. There will be a 25% discount on all orders for 100 or more copies mailed to a single address. Sales orders must be prepaid on a cash, check, or money order basis.
    [Show full text]
  • Apollo 11 Astronaut Neil Armstrong Broadcast from the Moon (July 21, 1969) Added to the National Registry: 2004 Essay by Cary O’Dell
    Apollo 11 Astronaut Neil Armstrong Broadcast from the Moon (July 21, 1969) Added to the National Registry: 2004 Essay by Cary O’Dell “One small step for…” Though no American has stepped onto the surface of the moon since 1972, the exiting of the Earth’s atmosphere today is almost commonplace. Once covered live over all TV and radio networks, increasingly US space launches have been relegated to a fleeting mention on the nightly news, if mentioned at all. But there was a time when leaving the planet got the full attention it deserved. Certainly it did in July of 1969 when an American man, Neil Armstrong, became the first human being to ever step foot on the moon’s surface. The pictures he took and the reports he sent back to Earth stopped the world in its tracks, especially his eloquent opening salvo which became as famous and as known to most citizens as any words ever spoken. The mid-1969 mission of NASA’s Apollo 11 mission became the defining moment of the US- USSR “Space Race” usually dated as the period between 1957 and 1975 when the world’s two superpowers were competing to top each other in technological advances and scientific knowledge (and bragging rights) related to, truly, the “final frontier.” There were three astronauts on the Apollo 11 spacecraft, the US’s fifth manned spaced mission, and the third lunar mission of the Apollo program. They were: Neil Armstrong, Edwin “Buzz” Aldrin, and Michael Collins. The trio was launched from Kennedy Space Center in Florida on July 16, 1969 at 1:32pm.
    [Show full text]
  • The Moon Is a Harsh Chromatogram: the Most Strategic Knowledge Gap (Skg) at the Lunar Surface E
    50th Lunar and Planetary Science Conference 2019 (LPI Contrib. No. 2132) 2766.pdf THE MOON IS A HARSH CHROMATOGRAM: THE MOST STRATEGIC KNOWLEDGE GAP (SKG) AT THE LUNAR SURFACE E. Patrick, R. Blase, M. Libardoni, Southwest Research Institute®, 6220 Culebra Rd., San Antonio, TX 78238 ([email protected]) Introduction: Data from analytical instruments de- a gas chromatograph mass spectrometer (GCMS) and ployed during multiple lunar missions, combined with revealed 97% of the composition in that mass channel laboratory results[1], suggest the regolith surface of the to be N2. Henderson et al.[5] also identified amino ac- Moon traps more volatiles in gas-surface interactions ids which were attributed to contamination, but results than is currently understood. We assert that the lunar from recent more sensitive LCMS and GCMS experi- surface behaves as a giant 3-D surface chromatogram, ments by Elsila et al.[1] found some amino acid and separating gas molecules by species as each wafts other organic signatures to be extraterrestrial in origin. across the regolith according to its mobility and ad- While these and other investigations suggest contami- sorption characteristics before eventually becoming nation from the Apollo spacecraft as a likely source for trapped. Herein we present supporting evicence for this a number of observed signatures[1,2,4,5], what is not claim. explained is the nature of the trapping mechanism for In gas chromatography (GC), components of a the N2 feature in 10086, and demonstrates gas retention sample are separated within a column according to from a gas that, under most circumstances, exhibits no their individual partitioning coefficients and by such retention at temperatures around 300 K[3].
    [Show full text]
  • Space Sector Brochure
    SPACE SPACE REVOLUTIONIZING THE WAY TO SPACE SPACECRAFT TECHNOLOGIES PROPULSION Moog provides components and subsystems for cold gas, chemical, and electric Moog is a proven leader in components, subsystems, and systems propulsion and designs, develops, and manufactures complete chemical propulsion for spacecraft of all sizes, from smallsats to GEO spacecraft. systems, including tanks, to accelerate the spacecraft for orbit-insertion, station Moog has been successfully providing spacecraft controls, in- keeping, or attitude control. Moog makes thrusters from <1N to 500N to support the space propulsion, and major subsystems for science, military, propulsion requirements for small to large spacecraft. and commercial operations for more than 60 years. AVIONICS Moog is a proven provider of high performance and reliable space-rated avionics hardware and software for command and data handling, power distribution, payload processing, memory, GPS receivers, motor controllers, and onboard computing. POWER SYSTEMS Moog leverages its proven spacecraft avionics and high-power control systems to supply hardware for telemetry, as well as solar array and battery power management and switching. Applications include bus line power to valves, motors, torque rods, and other end effectors. Moog has developed products for Power Management and Distribution (PMAD) Systems, such as high power DC converters, switching, and power stabilization. MECHANISMS Moog has produced spacecraft motion control products for more than 50 years, dating back to the historic Apollo and Pioneer programs. Today, we offer rotary, linear, and specialized mechanisms for spacecraft motion control needs. Moog is a world-class manufacturer of solar array drives, propulsion positioning gimbals, electric propulsion gimbals, antenna positioner mechanisms, docking and release mechanisms, and specialty payload positioners.
    [Show full text]