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Bettella, Alberto (2008) Generation and propagation of vibrations on satellite structures and planetary bodies after hypervelocity impacts. [Tesi di dottorato]

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Abstract (inglese)

Hyper-Velocity-Impacts (HVI) are a common problem in the space environment. They especially concern space missions, in terms of:

Potential damage to spacecrafts and satellites Collisional evolution of small and large bodies of the Solar System.

This thesis focuses on the effect of such impacts, through the analysis of the vibration field generated by HVI on both of the aforementioned cases.

Referring to the first point, i.e. the HVI-induced disturbances on spacecraft internal components, a wide experimental campaign has been performed on targets representative of S/C structures, making it possible to measuring and reproducing the HVI-induced vibration field on the selected targets. The aim of this activity was to acquire data on transient waves generated after an HVI and propagating from the impact point. Such disturbances have been evaluated in from of acceleration signals.
The invaluable information achievable from such an activity is related to the HVI ability of loading structures up to frequencies that are normally not explored in the standard practice for mechanical dynamic testing. These loads can damage electronic components and sensors mounted on S/C.
An experimental campaign on structural components represents a unique mean of collecting data about the transient behaviour of spacecraft components subjected to HVI threat. The Study is relevant to both "simplified" (i.e. simple plates and sandwich panels made by Aluminium alloy and composite materials) and "complex" (i.e. structural assemblies including joints) targets, hit by projectiles in the range 0.6 - 2.3 mm at velocity from 2 to 5 km/s.
The test-case selected for the experimental activity is the GOCE satellite, whose mission main objective is to measure the Earth's gravity field modelling the geoid with extremely high accuracy and spatial resolution. To do this, it will carry a gradiometer that is sensitive to disturbances, like the one generated by HVI. For this reason, the assessment of the vibration field that propagates after an HVI is fundamental.
As a conclusion, the activity on spacecraft structures resulted in the creation of an extensive database of the disturbance field generated and propagated by HVI on simple and complex assemblies, even highlighting the dependence of the structural response from the mass and velocity of the impacting debris. The disturbance was quantified computing SRS spectra of the measured acceleration signals.
This activity made also possible to evaluate the momentum transferred by the projectiles to the impacted targets. This measurement was necessary to validate the numerical technique used to extrapolate the experimental results to structures and impact conditions different from those achievable at laboratory scale with the existing hypervelocity facilities [28].
Moreover, to investigate in detail the typical features of transient disturbances, a dedicated study was implemented on the application of Wavelet Transform (WT) to the sampled acceleration signal on aluminium simple plates and honeycomb sandwich panels. WT was used to explore the complex wave generation and propagation behaviour inside these targets, thanks to its ability of identifying the following wave features: speed of propagation, type, dispersion properties and frequency content. This work led to a better understanding of the origin of disturbance field due to HVI, demonstrating that WT technique may be used to analyse the elementary constituents of transitory signals.

Referring to the second point, i.e. the study of the collisional evolution of minor bodies of the Solar System, several numerical simulations were carried out to study the wave propagation on planetary-like objects.
HVI characterize the evolutional story of all the small and large bodies of the Solar System. For this reason, the goal of simulations on porous materials (concrete was used as test-case in this thesis) was to obtain a better comprehension of the impact processes and to provide a tool to validate the results of numerical models, through the analysis of wave generation and propagation on different materials. The results of this activity aimed also to contribute to the data interpretation of the ground and space based observations, in particular in view of space missions such as Smart1, MarsExpress, VenusExpress, BepiColombo, Cassini-Huygens, Rosetta, Dawn.
Impact experiments to investigate craterization and catastrophic disruption on planetary objects are limited due to scale effect (i.e. size of the targets, Earth gravity environment, actual performance of the modern hypervelocity facilities). Therefore, a possible method used to study the impact processes is to perform numerical simulations with hydrocodes. The main issue with these tools is the unknown response of materials to high velocity impacts, pressures of several MPa and shock wave propagation. The validation of such models implies to test with the available impact facilities small-scale targets representative of real asteroids and to match experiments and numerical simulations. Waves propagating within the impacted target can be used in the assessment of such numerical models, through the comparison of waves features like: speed, frequency and reflections.
In this thesis the possibility to use an accelerometer to measure waves propagation in concrete spheres (representative of porous targets) and to identify wave features with WT is explored. For this reason, SPH (smooth particles hydrocode) simulations have been carried out on a small-scale concrete sphere to better understand the propagation of shock waves and to evaluate the load effects due to the accelerometer mass. Results show that this measurement is possible, even if it is necessary to perform it with a highly sensitive measurement chain.

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Tipo di EPrint:Tesi di dottorato
Relatore:Angrilli, Francesco
Correlatore:Francesconi, Alessandro - Pavarin, Daniele
Dottorato (corsi e scuole):Ciclo 20 > Scuole per il 20simo ciclo > SCIENZE TECNOLOGIE E MISURE SPAZIALI > MISURE MECCANICHE PER L'INGEGNERIA
Data di deposito della tesi:31 Gennaio 2008
Anno di Pubblicazione:31 Gennaio 2008
Parole chiave (italiano / inglese):wave propagation, wavelet, hypervelocity impact
Settori scientifico-disciplinari MIUR:Area 09 - Ingegneria industriale e dell'informazione > ING-IND/04 Costruzioni e strutture aerospaziali
Area 09 - Ingegneria industriale e dell'informazione > ING-IND/05 Impianti e sistemi aerospaziali
Struttura di riferimento:Centri > Centro Interdipartimentale di ricerca di Studi e attività  spaziali "G. Colombo" (CISAS)
Codice ID:930
Depositato il:09 Set 2008
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Le url contenute in alcuni riferimenti sono raggiungibili cliccando sul link alla fine della citazione (Vai!) e tramite Google (Ricerca con Google). Il risultato dipende dalla formattazione della citazione.

[1] Piersol, A.G., “Pyroshock Recommendations in Proposed MIL-HDBK on Guidelines for Dynamic Data Acquisition and Analysis”, Journal of the IES, Sept./Oct. 1992 Cerca con Google

[2] Handbook for Dynamic Data Acquisition and Analysis, Institute of Environmental Sciences and Technology Cerca con Google

[3] NASA Technical Standard Pyroshock test criteria, NASA-STD-7003, 1999 Cerca con Google

[4] ENV 13005:1999, “Guide to the expression of uncertainty in measurement” Cerca con Google

[5] Jeong, H., Jang, Y., “Wavelet analysis of plate wave propagation in composite laminates”, Composite Structures, vol. 49, 2000, pp. 443-450 Cerca con Google

[6] Doyle, J.F., “Wave propagation in structures”, Mechanical Engineering Series, 1997, pp. 27-41 Cerca con Google

[7] Graff, K.F., “Wave motion in elastic solids”, Calderon Press – Oxford 1975, p. 457 Cerca con Google

[8] MatLab user manual Cerca con Google

[9] SDH Team, “Test plan”, ALS-SDH-TNO-002, TN2 of the ESA Contract 17854/03/NL/CH “Spacecraft Disturbances from HVI”, 23/05/2005 Cerca con Google

[10] Graff Karl F., Wave Propagation in Elastic Solids, Calderon Press, Oxford 1975 Cerca con Google

[11] Meo M., Zumpano G. Impact identification on a sandwich plate from wave propagation responses. Composite structures 71 (2005) 302-306 Cerca con Google

[12] Wang L., Yuan F.G. Group velocity and characteristic wave curves of Lamb waves in composites: Modeling and experiments. Composites Science and Technology 67 (2007) 1370-1380 Cerca con Google

[13] Newland D.E. Ridge and Phase Identification in the Frequency Analysis of Transient Signals by Harmonic Wavelets. Journal of Vibration and Acoustics vol. 121 (April 1999) Cerca con Google

[14] Park H.C., Kim D.S. Evaluation of the dispersive phase and group velocities using harmonic wavelet Transform NDT&E International 34 (2001) 457-467 Cerca con Google

[15] Cattani C. The wavelet-based technique in dispersive wave propagation. International Applied Mechanics, Vol. 39, No. 4, 2003 Cerca con Google

[16] Newland D. E. Harmonic wavelets in vibrations and acoustics. Phil. Trans. R. Soc. Lond. A(1999) 357, 2607-2625 Cerca con Google

[17] CNES activity report at the 19th IADC meeting DLR March 22-23, 2001 cologne-Porz, Germany. Cerca con Google

[18] Pavarin D., Francesconi A., Debei S., Caporal G., Preliminary design of a test bed to evaluate the requirements of an accelerometric instrumentation to study the effects of hypervelocity impacts on space shield, Mechanical Measurements Conference, 17-19 Sept. 2002, Abano Terme, Italy. Cerca con Google

[19] C. Giacomuzzo, F. Ferri, A. Bettella: Hypervelocity experiments of impact cratering and catastrophic distruption of minor bodies of the Solar System, COSAPAR 2006. Cerca con Google

[20] Prosser W. H., Application of Advanced, Wavefrom Based AE Techniques for testing Composite Material, Proceeding of the SPIE Conference on Nondestructive Evaluation Technique for Aging Infrastructure and manufacturing: Material and Composites, December 2-5, 1996, Scottsdale, Arizona. Cerca con Google

[21] Prosser W.H., Gorman Michael R. and Humes Donald H.,. Acoustic emission signal in thin plates produced by impact damage, Journal of acoustic emission vol 17(1-2) (June 1999), pp 29-36. Cerca con Google

[22] Faraud M., Meteoroids and Debris Environment Analysis for Disturbance Assessment on the Gradiometer GO-TN-AI-0092, Issue 01, 30 July 2002. Cerca con Google

[23] Faraud M., Disturbances induced by MMOD impacts GO-TN-AI-0099, Issue 01, 20 May 2003 Cerca con Google

[24] Pavarin D., Lambert M., Francesconi A., Destefanis R., Bettella A., Debei S., De Cecco M., Faraud M., Giacomuzzo C., Marucchi-Chierro P.C., Parzianello G., Saggin B. and Angrilli F. Analysis of GOCE’s disturbances induced by hypervelocity impact” 4th European, Conference on Space Debris Darmstadt 2005. Cerca con Google

[25] Pavarin D., Francesconi A , Destefanis R., Lambert M.,.Bettella A., Debei S., De Cecco M., Faraud M., Giacomuzzo C., Marucchi-Chierro P.C., Parzianello G., Saggin B. and Angrilli. Acceleration Fields Induced By Hypervelocity Impacts On Spacecraft Structures. International Journal of Impact Engineering. Vol. 33, Pp. 580-591 Issn: 0734-743x. Cerca con Google

[26] Francesconi A., Pavarin D., Bettella A., Giacomuzzo C., Faraud M, Destefanis R., Lambert M. and Angrilli F. Generation of transient vibrations on aluminum honeycomb sandwich panels subjected to hypervelocity impact Hypervelocity Impact Symposium 23-27 september 2007, Williamsbug (Virginia USA), to be published on the International Journal of Impact Engineering Issn: 0734-743x. Cerca con Google

[27] Bettella A., Francesconi A., Pavarin D., Giacomuzzo C. and Angrilli F. Application of wavelet Transform to analyze acceleration signals generated by HVI on thin aluminum plates and all-aluminum honeycomb sandwich panels, Hypervelocity Impact Symposium 23-27 september 2007, Williamsbug (Virginia USA), to be published on the International Journal of Impact Engineering Issn: 0734-743x.. Cerca con Google

[28] Giacomuzzo C., Pavarin D., Francesconi A., Lambert M., Angrilli F. "SPH evaluation of out-plane peak force transmitted during a hypervelocity impact", Hypervelocity Impact Symposium 23-27 september 2007, Williamsbug (Virginia USA), to be published on the International Journal of Impact Engineering Issn: 0734-743x.. Cerca con Google


[30] S-50/95-TD-HTS, ESTEC CONTRACT 11540/95/NL/JG, ESABASE/DEBRIS Release 2, Technical Description, August 1998 Cerca con Google

[31] Rubin, S., "Concepts in Shock Data Analysis", Ch. 23, Shock and Vibration Handbook, 4th ed., (Ed: C. M. Harris), McGraw-Hill, NY, 1996. Cerca con Google

[32] Trubert, M., and Salama, M. A., Generalized Modal Shock Spectra Method for Spacecraft Loads Analysis, AIAA J., Vol. 18, No 8, pp. 988-994, Aug. 1980. Cerca con Google

[33] NASA/JSC Orbital debris models, Nicholas Johnson and Eric Christiansen, Proceeding of the Second European Conference on space debris, ESOC, Darmstadt, Germany, March 1997 Cerca con Google

[34] Britt, D., Yeomans, D., Housen, K., et al. Asteroid density, porosity, and structure, in: Bottke Jr., W.F., Cellino, A., Paolicchi, P., Binzel, R.P. (Eds.), Asteroids III. University of Arizona Press, Tucson, pp. 485– 500, 2002. Cerca con Google

[35] Fujiwara A. et al The Rubble-Pile Asteroid Itokawa as observed by Hayabusa Science 312, 1330-1333, 2006 Cerca con Google

[36] Flynn, G.J., Moore, L.B., Klöck, W. Density and porosity of stone meteorites: implications for the density, porosity, cratering, and collisional disruption of asteroids. Icarus 142, 97–105, 1999. Cerca con Google

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