1,721,104 research outputs found
Realizzazioni e possibilità di trasferimento tecnologico del centro spaziale dell'università di padova CISAS
No full textFree-Flying Robot Tested on ESA Parabolic Flights: Simulated Microgravity Tests and Simulator Validation
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Analisi in frequenza con il metodo della massima entropia
No full textAllo scopo di superare alcuni dei problemi (numero dei dati carnipona ti, risoluzione in
frequenza. necessita di zoom) che si presenlano con i metodi di analisi tradizionale e. in partieolare per
riconoscere componenti con frequenze molto vicine tra di loro presenti in un segna!e con rumore e state
irnplementato un programma di calcolo che permette I' anatisi in frequenza di segnali con un' elevata
risoluzione e necessita di un numero di dati carnplonati inferiore rispetto ai metodi tradizionali. Tra Ie
varie pos sibilita offerte dagli algoritmi di analisi sviluppati negli ultimi anni si e scelto il metodo delia
rnassima entropia (MEM 0 MESA) [4,6,7,15.18,19] e sl e voluto controllare se eifettivamente tale
melodo eonsente una risoluzione piu spinta rispetto ai melodi lradizionali e se permette di utilizz are un
numero di dati inferiore[22]
Diagnostic Procedure for two stage light gas gun pellet injector
No full textThis work, by means of the numerical modeling of a two-stage light gas gun, analyses deterioration parameters and proposes a procedure for diagnosing functional parameters of two-stage light gas guns with high firing frequency. Analyzed parameters are: piston wear and deformation, delay in first-stage valve opening, and piston seize-up. The procedure was developed by means of gas-dynamic numerical modeling. Experimental tests demonstrate that this procedure can be realistically applie
Reliability oriented design and testing of a telescope's front cover for long life space mission
No full textThe reliability of a telescope's front cover constitutes its primary demand, not to compromise the
functionality of the whole instrument. From this point of view the design of the mechanism and the testing
campaign should prove its fulfillment to the performance requirements, and its insensitivity to the
environmental conditions, particularly for a long life mission where the performances have to be guaranteed
along the whole life of the experiment. The Front Door Mechanism for the WAC (Wide Angle Camera) and
NAC (Narrow angle Camera) telescopes constituting the OSIRIS experiment of the ROSETTA mission has
been optimized to minimize the loads acting during its functional phases and the loads transferred to the
other components of the optical bench, but at the same time to bear the loads acting during the launch and
in the operating environment.
The test campaign performed to demonstrate the compliancy of the mechanism to the requirements
included environmental tests such as vibration and thermal vacuum cycling, life test, measurement of the
resistant torque and of the reliability of the housekeeping sensors, and proved the fulfillment of the device to
the requirements in terms of performances and insensitivity to the environmental tests performed.
The life test executed during the thermal cycling proved the capacity of the mechanism to maintain its
characteristics all along the number of activations foreseen for the test, being also unaffected by the
temperature variations within the operating range
Messa a punto di un sistema di termovuoto per la verifica del controllo termico di strumentazione operante nello spazio
No full textMessa a punto di un sistema di termo-vuoto per la verifica del controllo termico di strumentazione operante in ambiente spaziale
No full textAncon
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