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  • 1
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    Structural damage detection of space truss structures using best achievable eigenvectors (1994)
    In:  Other Sources
    Details
    Publication Date: 2011-08-24
    Description: A method is presented by which measured modes and frequencies from a modal test can be used to determine the location and magnitude of damage in a space struss structure. The damage is located by computing the Euclidean distances between the measured mode shapes and the best achievable eigenvectors. The best achievable eigenvectors are the projection of the measured mode shapes onto the subspace defined by the refined analytical model of the structure and the measured frequencies. Loss of both stiffness and mass properties can be located and quantified. To examine the performance of the method when experimentally measured modes are employed, various damage detection studies using a laboratory eight-bay truss structure were conducted. The method performs well even though the measurement errors inevitably make the damage location more difficult.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: AIAA Journal (ISSN 0001-1452); 32; 5; p. 1049-1057
    Format: text
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  • 2
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    Underlying modal data issues for detecting damage in truss structures (1992)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: Independent of the modal identification techniques employed for damage detection, use of measured modal data limits the expectations for damage location. These limitations are examined using the distribution of modal strain energy and the sensitivity of the frequency and mode shapes to structural stiffness changes. For given measured modal information of specific accuracy, this examination reveals the following: (1) damage detection is feasible for members that contribute significantly to the strain energy of the measured modes, (2) the modes which are most effective in detecting damage to certain critical members can be identified, and (3) a relationship can be drawn between the accuracy of the measured modes and frequencies and damage detection feasibility.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-107573 , NAS 1.15:107573 , Structures, Structural Dynamics, and Materials Conference; Apr 13, 1992 - Apr 17, 1992; Dallas, TX; United States
    Format: application/pdf
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  • 3
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    On-orbit damage detection and health monitoring of large space trusses - Status and critical issues (1991)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The literature in the fields of structural identification, mode shape expansion and orthogonalization, and on-orbit damage location of large space trusses is reviewed. The use of a Dynamic Scale Model Technology (DSMT) hybrid scale model for damage location research and as a universal test bed for other damage location methods is proposed as a means of comparing and evaluating existing and newly developed methods in the named areas. Issues concerning on-orbit data acquisition, data accuracy, and data quality relevant to structural dynamic system identification which require extensive research are identified.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: AIAA PAPER 91-1181 , AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics, and Materials Conference; Apr 08, 1991 - Apr 10, 1991; Baltimore, MD; United States
    Format: text
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  • 4
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    Underlying modal data issues for detecting damage in truss structures (1992)
    In:  Other Sources
    Details
    Publication Date: 2019-07-13
    Description: The modal strain energy distribution and frequency and mode shape sensitivities to structural stiffness changes are studied in order to overcome the current limits of modal data limit measurements in damage location. It is established that damage detection is feasible for members significantly contributing to the strain energy of the measured modes; the modes that are most effective in detecting the damage of critical members are identifiable, and a relationship is formulated between the accuracy of the measured modes and frequencies and the probability of damage detection.
    Keywords: SPACECRAFT DESIGN, TESTING AND PERFORMANCE
    Type: AIAA PAPER 92-2264 , AIAA/ASME/ASCE/AHS/ASC Structures, Structural Dynamics and Materials Conference; Apr 13, 1992 - Apr 15, 1992; Dallas, TX; United States
    Format: text
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  • 5
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    Ground vibration tests of a high fidelity truss for verification of on orbit damage location techniques (1992)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: This paper describes a series of modal tests that were performed on a cantilevered truss structure. The goal of the tests was to assemble a large database of high quality modal test data for use in verification of proposed methods for on orbit model verification and damage detection in flexible truss structures. A description of the hardware is provided along with details of the experimental setup and procedures for 16 damage cases. Results from selected cases are presented and discussed. Differences between ground vibration testing and on orbit modal testing are also described.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-107626 , NAS 1.15:107626 , AIAA PAPER 92-2264 , Structures, Structural Dynamics and Materials Conference; Apr 13, 1992 - Apr 15, 1992; Dallas, TX; United States
    Format: application/pdf
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  • 6
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    On-orbit damage detection and health monitoring of large space trusses: Status and critical issues (1991)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The long lifetimes, delicate nature and stringent pointing requirements of large space structures such as Space Station Freedom and geostationary Earth sciences platforms might require that these spacecraft be monitored periodically for possible damage to the load carrying structures. A review of the literature in damage detection and health monitoring of such structures is presented, along with a candidate structure to be used as a testbed for future work in this field. A unified notation and terminology is also proposed to facilitate comparisons between candidate methods.
    Keywords: STRUCTURAL MECHANICS
    Type: NASA-TM-104045 , NAS 1.15:104045 , Structures, Structural Dynamics and Materials Conference; Apr 08, 1991 - Apr 10, 1991; Baltimore, MD; United States
    Format: application/pdf
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