Repositori URV

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

Programa de financiación: altres; 2014SGR365

URL Documento de licencia: https://repositori.urv.cat/ca/proteccio-de-dades/

Entidad: Universitat Rovira i Virgili

Año de publicación de la revista: 2014

Página inicial: 16

Tipo de publicación: Article Artículo Article