Acoustic Analysis Method for Flat Panel Speaker Driven by Giant Magnetostrictive-Material-Based Exciter(Linear Motor concerning Daily Life)

Article Japanese OPEN
兪, 炳振 ; 平田, 勝弘 ; 大西, 敦郎 ; Byungjin, YOO ; Katsuhiro, HIRATA ; Atsurou, OONISHI ; 大阪大学 ; 大阪大学 ; 大阪大学 (2011)
  • Journal: 日本AEM学会誌 = Journal of the Japan Society of Applied Electromagnetics, volume 19, issue 1, pages 9-13 (issn: 0919-4452)
  • Subject: magnetostriction | acoustic analysis | flat panel speaker | coupled analysis | FEM
    arxiv: Computer Science::Sound

This paper presents a coupled analysis method of electromagnetic-structural-acoustic fields for flat panel speaker driven by giant magnetostrictive material (GMM) based exciter designed by using the finite element method (FEM). The acoustic field creation of the flat panel speaker driven by GMM exciter relies on the vibration of flat panel caused by magnetostrictive phenomenon of GMM when a magnetic field is applied. In this case, to predict the sound pressure level (SPL) at audio frequency range, it is necessary to take into account not only magnetostriction of GMM but also eddy current effect, vibration characteristics of the exciter and the flat panel. This method is applied to predict the performance of the flat panel speaker at audio frequency. Moreover, the validity of the analysis method is verified by the measurement of a prototype.
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