Elastic Mass Actuator (EMA) concept for Sound Transmission Loss increase of panel like structures

Seppo Uosukainen, Ari Saarinen, Kiran Sahu, Hannu Nykänen, Antti Kelloniemi

    Research output: Chapter in Book/Report/Conference proceedingConference article in proceedingsScientificpeer-review

    Abstract

    The Elastic Mass Actuator (EMA) is a dynamic mass absorber controlled by active means. Simulations have proved that the harmonic distortion, being very low, is not a relevant parameter with EMA, due to its symmetric construction. With the optimized parameter values 1 m amplitude can be achieved with a signal voltage of 20 V. This is enough e.g. for façade elements in buildings, but applications where higher amplitudes are needed will require rather large alterations in the construction. The properties of EMA have been studied also experimentally by measuring the displacement and phase distributions of the actuator, and by using EMA to actively reduce the vibration of a sandwich plate construction. The reduction ratios of EMA (ratio of displacements control on to control off) have varied from 0.54 to 0.65 (mean 0.6) at single frequency excitations and around 0.65 at narrow band excitations. The first EMA element is not able to reduce sound pressure levels due to its non-even phase and displacement distributions.
    Original languageEnglish
    Title of host publicationProceedings of the International Conference on Noise and Vibration Engineering, ISMA2008
    EditorsPaul Sas
    Place of PublicationLeuven
    Pages381-395
    Publication statusPublished - 2008
    MoE publication typeA4 Article in a conference publication
    EventInternational Conference on Noise and Vibration Engineering, ISMA 2008 - Leuven, Belgium
    Duration: 15 Sep 200817 Sep 2008

    Conference

    ConferenceInternational Conference on Noise and Vibration Engineering, ISMA 2008
    Abbreviated titleISM2008
    CountryBelgium
    CityLeuven
    Period15/09/0817/09/08

    Keywords

    • active noise control
    • sound transmission loss
    • dynamic mass absorber
    • simulations
    • measurements

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  • Cite this

    Uosukainen, S., Saarinen, A., Sahu, K., Nykänen, H., & Kelloniemi, A. (2008). Elastic Mass Actuator (EMA) concept for Sound Transmission Loss increase of panel like structures. In P. Sas (Ed.), Proceedings of the International Conference on Noise and Vibration Engineering, ISMA2008 (pp. 381-395).