On-orbit damage detection and health monitoring of large space trusses - Status and critical issues

Kashangaki, Thomas A. L.

doi:10.2514/6.1991-1181

Cited by 31 publications

(9 citation statements)

References 2 publications

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“…For the multiple damage cases, the magnitude of the damage was predicted accurately and, in most cases, the damage locations were also accurately predicted. Kashangaki (1991) proposes the use of the DSMT testbed at NASA-Langley Research Center for damage detection research. One component of the DSMT, an 8-bay truss, was tested in a cantilevered configuration.…”

Section: Trussesmentioning

confidence: 99%

Damage identification and health monitoring of structural and mechanical systems from changes in their vibration characteristics: A literature review

Doebling¹,

Farrar²,

Prime³

et al. 1996

2,213

1,394

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Section: Trussesmentioning

confidence: 99%

Damage identification and health monitoring of structural and mechanical systems from changes in their vibration characteristics: A literature review

Doebling¹,

Farrar²,

Prime³

et al. 1996

2,213

1,394

View full text Add to dashboard Cite

“…The invertible matrix Y(w) represents a frequency dependent set of complex eigenvectors which transform member deflections and internal forces into leftward and rightward travelling wave modes which propagate along the structure (x,w) = Y(D(x,w) (5) Each column of this matrix yields the relative magnitude and phase of the physical variables 7(x, w)which are present in the corresponding wave type.…”

Section: Wave Mode Coordinatesmentioning

confidence: 99%

<title>Modeling damage in rotorcraft flexbeams using wave models</title>

Lakshmanan

Pines

1998

SPIE Proceedings

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This paper discusses the application of wave propagation analysis to detect damage in rotorcraft flexbeams in the form of cracks and delaminations. The approach used involves examining the local scattering properties of structural discontinuities in the frequency domains to assess the effect of damage on the modal response of the structure. A model using a simulated cantilevered beam is used to illustrate the performance of the wave model approach for dynamic detection of damage in the form of transverse cracks imparted to composite rotorcraft flexbeams. Experimental validation is carried out on a graphite/epoxy cantilever beam test specimen with (O/9O)s ply orientation in vacuum. Damage in the form of a transverse crack, which extends across the entire width of the specimen is imparted at depths of 25, 50 and 75 % of the beam thickness to the test specimen. A piezoelectric actuator mounted near the root is used to excite the structure dynamically to help locate and determine the extent of damage. The resonant frequencies and scattering properties are used as performance metrics to compare the experimental behavior against the analytical predictions from the wave modeling. Composite beams with artificially induced midplane delaminations oflengths (1/2 ), (1 ), and (2 ) were also tested experimentally.

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“…O´Brien, 2017). The damage diagnosis as a successive step can apply also many ways how to reveal the possible damage reaching from directly measured time series, identified natural frequencies (Kashangaki, 1991) and mode shapes (Padney, 1995;overview by Salgado, 2008) over the response functions (Sampaio, 2003) or power spectral densities (Li, 2015), of course also under consideration of various statistical methods (Faber, 2000;Mainini, 2017).…”

Section: Introductionmentioning

confidence: 99%

Proposal for loading tests of bridges - simulation and laboratory experiments

2018

Engineering Mechanics

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A new dynamic load testing of bridges is proposed and theoretically investigated. A transient analysis of passing vehicle over a bridge in ANSYS and an analytical program in MATLAB for the transient solution of piecewise linear mechanical structures were developed to assess the effects of the proposed dynamic load on a bridge model. According to the first laboratory experiments, it seems that the proposed travelling impulse load could surpass some of the shortcomings and limitations of the currently applied methods of bridge testing. The investigation is a part of a project aimed at drive-by identification of dynamic properties of bridges and further experimental and analytical research will follow.

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On-orbit damage detection and health monitoring of large space trusses - Status and critical issues

Cited by 31 publications

References 2 publications

Damage identification and health monitoring of structural and mechanical systems from changes in their vibration characteristics: A literature review

Damage identification and health monitoring of structural and mechanical systems from changes in their vibration characteristics: A literature review

<title>Modeling damage in rotorcraft flexbeams using wave models</title>

Proposal for loading tests of bridges - simulation and laboratory experiments

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