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Research Papers

Lumped Element Multimode Modeling of Balanced-Armature Receiver Using Modal Analysis

[+] Author and Article Information
Wei Sun

Institute of Acoustics,
Tongji University,
1239 Siping Road,
Shanghai 200092, China
e-mail: sfwei01@163.com

Wenxiang Hu

Institute of Acoustics,
Tongji University,
1239 Siping Road,
Shanghai 200092, China
e-mail: wxhu@tongji.edu.cn

1Corresponding authors.

Contributed by the Noise Control and Acoustics Division of ASME for publication in the JOURNAL OF VIBRATION AND ACOUSTICS. Manuscript received April 6, 2016; final manuscript received August 16, 2016; published online September 30, 2016. Assoc. Editor: Miao Yu.

J. Vib. Acoust 138(6), 061017 (Sep 30, 2016) (8 pages) Paper No: VIB-16-1165; doi: 10.1115/1.4034535 History: Received April 06, 2016; Revised August 16, 2016

For the lack of higher-order modes, lumped element (LE) models currently used may be insufficient to predict the system of balanced-armature receiver (BAR). We develop an LE multimode model for BAR in the frequency domain based on the techniques of mode decomposition, truncation, and selection. The validation is made by comparing with both the corresponding combined finite element (FE)–LE model and the full FE model. Numerical results prove that the developed model is not only as effective as the combined FE–LE model but also much more efficient. Additionally, an in-depth investigation performed discloses the inherent deficiency of the traditional LE model.

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References

Figures

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Fig. 1

Geometry of the concerned simplified BAR: (a) mechanical domain and (b) acoustic domain

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Fig. 2

Energy norms of the system: (a) contour plot of ENc/E12 over the interested frequency range as function of both the truncated modal number and frequency, and (b) ENc/E12 as a function of the truncated modal number

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Fig. 3

DC gains of the system for the first six modes

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Fig. 8

Computation time comparison between the involved four models

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Fig. 7

FRs of the system (MechaFE-AcoLE represents the combined FE–LE model): (a) velocity at MP and (b) SPL in the 2 cc coupler

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Fig. 6

FRs of the system (FE, LE-4modes, and LE represent the full FE model, the LE multimode model, and the LE model, respectively): (a) velocity at MP and (b) SPL in the 2 cc coupler

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Fig. 5

Equivalent circuit of LE multimode model for BAR

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Fig. 4

Displacement FR of the mechanical system at MP with the four selected modes (sum(M1, M2, M4, M5) is the superposed result of the four selected modes, sum(M1:M12) is the superposed result of all the concerned 12 modes, FE is the result from the full FE model, and M1, M2, M4, and M5 are, respectively, the modal components of the selected four modes): (a) FRs of the modal components and (b) FR validation by referring to the model including all the concerned 12 modes and the full FE model

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Fig. 9

Volume velocities for the four componential modes and the whole system: q1, q2, q4, and q5 are, respectively, the volume velocities induced by the membrane for the first, second, fourth, and fifth modes of the mechanical system; qtot is the superposed results of the whole system

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Fig. 10

First two modes of mechanical system of simplified BAR: (a) fundamental mode (first mode) and (b) second mode

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Fig. 11

Volume velocities for the two decisive modes of the mechanical system: (a) amplitudes of the volume velocities and (b) phases of the volume velocities

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