التفاصيل البيبلوغرافية
| العنوان: |
Generation and propagation of vibrations on satellite structures and planetary bodies after hypervelocity impacts |
| المؤلفون: |
Bettella, Alberto |
| المساهمون: |
Angrilli, Francesco, Bettella, Alberto |
| بيانات النشر: |
Università degli studi di Padova |
| سنة النشر: |
2008 |
| المجموعة: |
Padua Research Archive (IRIS - Università degli Studi di Padova) |
| مصطلحات موضوعية: |
wave propagation, wavelet, hypervelocity impact, Settore ING-IND/04 - Costruzioni e Strutture Aerospaziali, Settore ING-IND/05 - Impianti e Sistemi Aerospaziali |
| الوصف: |
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 ... |
| نوع الوثيقة: |
doctoral or postdoctoral thesis |
| اللغة: |
English |
| العلاقة: |
numberofpages:183; alleditors:Angrilli, Francesco; http://hdl.handle.net/11577/3425965Test |
| الإتاحة: |
http://hdl.handle.net/11577/3425965Test |
| حقوق: |
info:eu-repo/semantics/openAccess |
| رقم الانضمام: |
edsbas.FC7D307D |
| قاعدة البيانات: |
BASE |
