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Author : Chad E. Rice
Publisher :
ISBN 13 :
Total Pages : 24 pages
Book Rating : 4.:/5 (317 download)
Download or read book Validation of Force Limited Vibration Testing at NASA Langley Research Center written by Chad E. Rice and published by . This book was released on 2003 with total page 24 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781721573219
Total Pages : 36 pages
Book Rating : 4.5/5 (732 download)
Download or read book Validation of Force Limited Vibration Testing at NASA Langley Research Center written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-06-20 with total page 36 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vibration tests were performed to develop and validate the forced limited vibration testing capability at the NASA Langley Research Center. The force limited vibration test technique has been utilized at the Jet Propulsion Laboratory and other NASA centers to provide more realistic vibration test environments for aerospace flight hardware. In standard random vibration tests, the payload is mounted to a rigid fixture and the interface acceleration is controlled to a specified level based on a conservative estimate of the expected flight environment. In force limited vibration tests, both the acceleration and force are controlled at the mounting interface to compensate for differences between the flexible flight mounting and rigid test fixture. This minimizes the over test at the payload natural frequencies and results in more realistic forces being transmitted at the mounting interface. Force and acceleration response data was provided by NASA Goddard Space Flight Center for a test article that was flown in 1998 on a Black Brant sounding rocket. The measured flight interface acceleration data was used as the reference acceleration spectrum. Using this acceleration spectrum, three analytical methods were used to estimate the force limits. Standard random and force limited vibration tests were performed and the results are compared with the flight data. Rice, Chad and Buehrle, Ralph D. Langley Research Center NASA/TM-2003-212404, L-18280, NAS 1.15:212404
Author : Terry D. Scharton
Publisher :
ISBN 13 :
Total Pages : 130 pages
Book Rating : 4.:/5 (317 download)
Download or read book Force Limited Vibration Testing Monograph written by Terry D. Scharton and published by . This book was released on 1997 with total page 130 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
Publisher :
ISBN 13 :
Total Pages : 14 pages
Book Rating : 4.:/5 (317 download)
Download or read book Benefits of Force Limiting Vibration Testing written by and published by . This book was released on 1999 with total page 14 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : T. D. Scharton
Publisher : CreateSpace
ISBN 13 : 9781499162974
Total Pages : 118 pages
Book Rating : 4.1/5 (629 download)
Download or read book Force Limited Vibration Testing Monograph written by T. D. Scharton and published by CreateSpace. This book was released on 2014-04-15 with total page 118 pages. Available in PDF, EPUB and Kindle. Book excerpt: The work described in this paper was carried out by the Jet Propulsion Laboratory, California Institute of Technology under a contact with the National Aeronautics and Space Administration. The support of the NASA Headquarters Office of Chief Engineer for the development and documentation of the force limited vibration testing technology described in this monograph is gratefully acknowledged.
Author : Paul Marchand
Publisher :
ISBN 13 :
Total Pages : pages
Book Rating : 4.:/5 (336 download)
Download or read book Investigation of the C2 Parameter of Force Limited Vibration Testing for Multiple Degrees-of-freedom Systems written by Paul Marchand and published by . This book was released on 2007 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Vijayamohan Rao Dharanipathi
Publisher :
ISBN 13 :
Total Pages : 0 pages
Book Rating : 4.:/5 (11 download)
Download or read book Investigation of the Semi-empirical Method for Force Limited Vibration Testing written by Vijayamohan Rao Dharanipathi and published by . This book was released on 2003 with total page 0 pages. Available in PDF, EPUB and Kindle. Book excerpt: Conventional vibration testing of aerospace hardware is normally performed by controlling the acceleration input to the base of a test item to the specifications, namely the envelope of the acceleration peaks of the flight environment. In the nineties, NASA JPL led the development and implementation of an improved method called Force Limited Vibration (FLV) testing. In addition to controlling the input acceleration, the FLV testing measures and limits the reaction forces between the test item and the shaker. This force limiting technique results in acceleration notching at predominant natural frequencies of the test item. Due to its partly empirical nature, the crucial coefficient, C 2, still requires some judgment for its selection. Although the semiempirical method is very powerful and has been implemented successfully on several space missions, there is still some work required to realize it and make it acceptable to everyone. The objective of this study is to present a comprehensive and complete analytical and experimental investigation on the semi-empirical method.
Author : Lucas Staab
Publisher : BiblioGov
ISBN 13 : 9781289091453
Total Pages : 38 pages
Book Rating : 4.0/5 (914 download)
Download or read book Application of the Semi-Empirical Force-Limiting Approach for the Connect Scan Testbed written by Lucas Staab and published by BiblioGov. This book was released on 2013-06 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: The semi-empirical force-limited vibration method was developed and implemented for payload testing to limit the structural impedance mismatch (high force) that occurs during shaker vibration testing. The method has since been extended for use in analytical models. The Space Communications and Navigation Testbed (SCAN Testbed), known at NASA Glenn Research Center (GRC) as, the Communications, Navigation, and Networking re-Configurable Testbed (CoNNeCT) project utilized force-limited testing and analysis following the semi-empirical approach. This presentation presents the steps in performing a force-limited analysis and then compares the results to test data recovered during the CoNNeCT force-limited random vibration qualification test that took place at NASA Glenn Research Center (GRC) in the Structural Dynamics Laboratory (SDL) December 19, 2010 - January 7, 2011. A compilation of lessons learned and considerations for future force-limited tests is also included.
Author :
Publisher :
ISBN 13 :
Total Pages : 13 pages
Book Rating : 4.:/5 (683 download)
Download or read book Development of a Force Specification for a Force-limited Random Vibration Test written by and published by . This book was released on 1996 with total page 13 pages. Available in PDF, EPUB and Kindle. Book excerpt: Vibration testing, techniques have been developed and employed that reduce the overtesting caused by the essentially infinite mechanical impedance of the shaker in conventional vibration tests. With these ''force-limiting'' techniques, two vibration test specifications are used: the conventional acceleration specification, and an interface force specification. The vibration level of the shake table is controlled such that neither the table acceleration nor the force transmitted to the test item exceeds its specification, hence the name ''dual control'' vibration test. The effect of limiting the shake table vibration to the force specification is to reduce (''notch'') the shaker acceleration near some of the test item's resonance frequencies. Several methods of deriving the force specification have been described in the literature. A new method is proposed in this paper that is based on a modal method of coupling two dynamic systems, in this case the ''source'' or launch vehicle, and the ''load'' or payload. The only information that is required is an experimentally-measurable frequency-response function (FRF) called the dynamic mass for both the source and the load. The method, referred to as the coupled system, modal approach (CSMA) method, is summarized and compared to an existing method of determining the force specification for force-limited vibration testing.
Author : National Aeronautics and Space Administration (NASA)
Publisher : Createspace Independent Publishing Platform
ISBN 13 : 9781719390699
Total Pages : 38 pages
Book Rating : 4.3/5 (96 download)
Download or read book Application of the Semi-Empirical Force-Limiting Approach for the CoNNeCT SCAN Testbed written by National Aeronautics and Space Administration (NASA) and published by Createspace Independent Publishing Platform. This book was released on 2018-05-22 with total page 38 pages. Available in PDF, EPUB and Kindle. Book excerpt: The semi-empirical force-limiting vibration method was developed and implemented for payload testing to limit the structural impedance mismatch (high force) that occurs during shaker vibration testing. The method has since been extended for use in analytical models. The Space Communications and Navigation Testbed (SCAN Testbed), known at NASA as, the Communications, Navigation, and Networking re-Configurable Testbed (CoNNeCT), project utilized force-limiting testing and analysis following the semi-empirical approach. This paper presents the steps in performing a force-limiting analysis and then compares the results to test data recovered during the CoNNeCT force-limiting random vibration qualification test that took place at NASA Glenn Research Center (GRC) in the Structural Dynamics Laboratory (SDL) December 19, 2010 to January 7, 2011. A compilation of lessons learned and considerations for future force-limiting tests is also included. Staab, Lucas D. and McNelis, Mark E. and Akers, James C. and Suarez, Vicente J. and Jones, Trevor M. Glenn Research Center IMPEDANCE; VIBRATION TESTS; DYNAMIC STRUCTURAL ANALYSIS; RANDOM VIBRATION; MATHEMATICAL MODELS; DYNAMIC RESPONSE; LESSONS LEARNED; SPACE COMMUNICATION; PAYLOADS; NAVIGATION
Author :
Publisher :
ISBN 13 :
Total Pages : 7 pages
Book Rating : 4.:/5 (683 download)
Download or read book Force-limited Vibration Tests Aplied to the FORTE' Satellite written by and published by . This book was released on 1996 with total page 7 pages. Available in PDF, EPUB and Kindle. Book excerpt: A force limited random vibration test was conducted on a small satellite called FORTE(prime). This type of vibration test reduces the over testing that can occur in a conventional vibration test. Two vibration specifications were used in the test: The conventional base acceleration specification, and an interface force specification. The vibration level of the shaker was controlled such that neither the table acceleration nor the force transmitted to the test item exceeded its specification. The effect of limiting the shake table vibration to the force specification was to reduce (or ''notch'') the shaker acceleration near some of the satellite's resonance frequencies. This paper describes the force limited test conducted for the FORTE(prime) satellite. The satellite and its dynamic properties are discussed, and the concepts of force limiting theory are summarized. The hardware and setup of the test are then described, and the results of the force limited vibration test are discussed.
Author : J. Jaap Wijker
Publisher : Springer Science & Business Media
ISBN 13 : 3540755535
Total Pages : 503 pages
Book Rating : 4.5/5 (47 download)
Download or read book Spacecraft Structures written by J. Jaap Wijker and published by Springer Science & Business Media. This book was released on 2008-01-08 with total page 503 pages. Available in PDF, EPUB and Kindle. Book excerpt: Space flight is a comprehensive and innovative part of technology. It encompasses many fields of technology. This monograph presents a cross section of the total field of expertise that is called "space flight". It provides an optimal reference with insight into the design, construction and analysis aspects of spacecraft. The emphasis of this book is put on unmanned space flight, particularly on the construction of spacecraft rather than the construction of launch vehicles.
Author : Joseph R. Chambers
Publisher :
ISBN 13 :
Total Pages : 406 pages
Book Rating : 4.3/5 ( download)
Download or read book Innovation in Flight written by Joseph R. Chambers and published by . This book was released on 2005 with total page 406 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : Harvey H. Hubbard
Publisher :
ISBN 13 :
Total Pages : 620 pages
Book Rating : 4.F/5 ( download)
Download or read book Aeroacoustics of Flight Vehicles written by Harvey H. Hubbard and published by . This book was released on 1991 with total page 620 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author :
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ISBN 13 :
Total Pages : 1048 pages
Book Rating : 4.F/5 ( download)
Download or read book International Aerospace Abstracts written by and published by . This book was released on 1999 with total page 1048 pages. Available in PDF, EPUB and Kindle. Book excerpt:
Author : James W. Kordig
Publisher :
ISBN 13 :
Total Pages : 112 pages
Book Rating : 4.E/5 ( download)
Download or read book Captive-fired Testing of Solid Rocket Motors written by James W. Kordig and published by . This book was released on 1971 with total page 112 pages. Available in PDF, EPUB and Kindle. Book excerpt:
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ISBN 13 :
Total Pages : 440 pages
Book Rating : 4.:/5 (3 download)
Download or read book Scientific and Technical Aerospace Reports written by and published by . This book was released on 1995 with total page 440 pages. Available in PDF, EPUB and Kindle. Book excerpt:
