Autor según el artículo: Jna. Gavaldà; Nuria Sáez; X. Ruiz; Valentina Shevtsova
Departamento: Química Física i Inorgànica
Autor/es de la URV: GAVALDÀ MARTÍNEZ, JOSEFA; Nuria Sáez; RUIZ MARTÍ, JOSÉ JAVIER; Valentina Shevtsova
Resumen: The present work aims to study mechanical nonlinearities detected in the accelerometric
records during a thermodiffusion experiment performed at the International Space
Station, ISS. In that experiment the test cell was subjected to harmonic vibrations of
different frequencies and amplitudes. Accelerometric data associated to the runs were
downloaded from NASA PIMS website. Second order spectral analysis shows that the
shaker modifies the normality of the data and introduces nonlinearities in the distribution
of energy. High Order Spectral Analysis, HOSA, based on the bispectrum, bicoherence,
trispectrum and tricoherence functions enabled us to study the kind of these nonlinearities.
Additionally, a new method using the biphase and triphase histograms helps us to
assess if quadratic and/or cubic phase coupling mechanisms are responsible for the
anomalous nonlinear energy transfer detected. Finally, the RMS acceleration values are
investigated to check if the vibratory limit requirements of the ISS are exceeded. This
methodology is important not only in generic research of aerospace engineering but also
in space sciences in order to help space researchers to characterize more globally their
experiments. It is mentioned finally that HOSA techniques are not new, but never have
been used in the analysis of accelerometric data coming from the ISS
Grupo de investigación: Processat Digital de Senyals en Entorns Aeroespacials i Biomèdics
Áreas temáticas: Física Física Physics
Acceso a la licencia de uso: https://creativecommons.org/licenses/by/3.0/es/
ISSN: 0094-5765
Identificador del autor: 0000-0001-7881-4192; ; 0000-0003-4020-4457;
Fecha de alta del registro: 2018-03-07
Página final: 25
Volumen de revista: 103
Versión del articulo depositado: info:eu-repo/semantics/submittedVersion
Enlace a la fuente original: https://www.sciencedirect.com/science/article/pii/S0094576514002240?via%3Dihub
Programa de financiación: altres; 2014SGR365
URL Documento de licencia: https://repositori.urv.cat/ca/proteccio-de-dades/
DOI del artículo: 10.1016/j.actaastro.2014.06.025
Entidad: Universitat Rovira i Virgili
Año de publicación de la revista: 2014
Página inicial: 16
Tipo de publicación: Article Artículo Article