Articles producció científica> Química Física i Inorgànica

Onsite vibrational characterization of DCMIX2/3 experiments

  • Dades identificatives

    Identificador: PC:3166
    Autors:
    Jna. GavaldàJudit OlléDiana DubertAna Laverón-SimavillaX. RuizValentina Shevtsova
    Resum:
    Filiació URV: SI
  • Altres:

    Autor segons l'article: Jna. Gavaldà; Judit Ollé; Diana Dubert; Ana Laverón-Simavilla; X. Ruiz; Valentina Shevtsova
    Departament: Química Física i Inorgànica
    Autor/s de la URV: GAVALDÀ MARTÍNEZ, JOSEFA; Judit Ollé; Diana Dubert; Ana Laverón-Simavilla; RUIZ MARTÍ, JOSÉ JAVIER; Valentina Shevtsova
    Resum: The SODI-DCMIX thermodiffusion series experiments are part of the fluid research program carried out by the European Space Agency on board of the International Space Station (ISS). In particular, DCIMIX2/3 were conducted in the past inside the Microgravity Science Glovebox in the US Laboratory. Due to the physical nature of the processes implied, these kind of runs were very long and particularly delicate because the low vibratory limit requirements must be maintained for hours. This restrictive condition not always is achieved, therefore, an accurate surveillance of the acceleration levels along the different experiments is necessary, to ensure a correct interpretation of the experimental results. This work analyzes onsite vibrational environment of DCMIX2/3 covering the periods in which the experiments were going on. To do so, acceleration signals only coming from the es03 sensor, nearest to the experimental equipment and located in the Glovebox, were downloaded from the PIMS NASA website. To be as precise as possible the signals have always been treated minute by minute. To detect the transient disturbances along the experiments, several warnings were considered. First, one minute RMS values, for the three acceleration components were evaluated, in time and in frequency domain. Additional information was obtained by plotting the power spectral densities of the signals, PSD, and their spectrogram with the aim of characterizing long periods of acceleration data. Due to great influence of low frequencies in this type of experiments, the Frequency Factor Index, FFI, was evaluated each minute. Complementary, the spectral entropy evolution was proposed as a fast new indicator of external perturbations. It has been found a good correlation between the spectrogram, temporal RMS and spectral entropy. Finally, a graphic representation of the points associated to the one-minute RMS values in one-third-octave frequency intervals which exceed the ISS limit curve requirements, was considered as a new and easy strategy for depicting the warnings that recognize the main disturbances along the experiment
    Grup de recerca: Processat Digital de Senyals en Entorns Aeroespacials i Biomèdics
    Àrees temàtiques: Física Física Physics
    Accès a la llicència d'ús: https://creativecommons.org/licenses/by/3.0/es/
    ISSN: 0094-5765
    Identificador de l'autor: 0000-0001-7881-4192; ; 0000-0002-7308-5872; ; 0000-0003-4020-4457;
    Data d'alta del registre: 2018-03-06
    Pàgina final: 419
    Volum de revista: 140
    Versió de l'article dipositat: info:eu-repo/semantics/acceptedVersion
    Enllaç font original: https://www.sciencedirect.com/science/article/pii/S0094576517306549?via%3Dihub
    Programa de finançament: plan; MVI-DCMIX/ISS; ESP2014-53603-P
    URL Document de llicència: https://repositori.urv.cat/ca/proteccio-de-dades/
    DOI de l'article: 10.1016/j.actaastro.2017.09.007
    Entitat: Universitat Rovira i Virgili
    Any de publicació de la revista: 2017
    Pàgina inicial: 409
    Tipus de publicació: Article Artículo Article
  • Paraules clau:

    Inèrcia (Mecànica)
    Vibració (Aeronàutica)
    Física
    Física
    Physics
    0094-5765
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