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The modal projectora)
a)Portions of this article were presented at the 151st Meeting of the Acoustical Society of America, Providence, RI, May 2006 [J. Acoust. Soc. Am. 119, 3409 (2006)].
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10.1121/1.3559684
/content/asa/journal/jasa/129/4/10.1121/1.3559684
http://aip.metastore.ingenta.com/content/asa/journal/jasa/129/4/10.1121/1.3559684

Figures

Image of FIG. 1.
FIG. 1.

Three modal projector beam patters with weighting factors: (a) A 1 = 1, A 2 = 0; (b) A 1 = 1, A 2 = 0.414; and (c) A 1 = 1.6, A 2 = 0.8.

Image of FIG. 2.
FIG. 2.

Monopole, dipole, and quadrupole modes with corresponding beam patterns.

Image of FIG. 3.
FIG. 3.

Voltage distribution from weighted contributions of each stack for the voltages of monopole, dipole, and quadrupole modes with dipole shading value 0.4.

Image of FIG. 4.
FIG. 4.

Distributed parameter equivalent circuit for an element of the modal projector.

Image of FIG. 5.
FIG. 5.

Calculated circuit model and measured TVR results for the monopole, dipole, and quadrupole modes of a five ring modal projector array.

Image of FIG. 6.
FIG. 6.

Photo of an end view of one ring and a fully assembled eight-ring PZT-8 driven modal projector.

Image of FIG. 7.
FIG. 7.

Eight-ring array measured (a) and finite element (b) narrow cardioid TVR with weightings A 1 = 1.6 and A 2 = 0.8.

Image of FIG. 8.
FIG. 8.

Measured omni (–––), dipole (- - -), and quadrupole (• • •) mode beam patterns: (a) below resonance at f 0, (b) resonance at 1.2f 0, and (c) above resonance at 1.4f 0.

Image of FIG. 9.
FIG. 9.

Measured ring array resultant narrow cardioid beam patterns with weightings A 1 = 1.6 and A 2 = 0.8: (a) below resonance at f 0, (b) resonance at 1.2f 0, and (c) above resonance at 1.4f 0.

Image of FIG. 10.
FIG. 10.

Single crystal two-ring array measured, equivalent circuit, and finite element model TVR.

Image of FIG. 11.
FIG. 11.

Flux lines for the modal projector Terfenol-D stacks.

Image of FIG. 12.
FIG. 12.

Photo of an end view and fully assembled two-ring Terfenol-D driven modal projector.

Image of FIG. 13.
FIG. 13.

Measured SPL response in the monopole (omni) and narrow cardioid modes for the Terfenol-D modal projector for 4 and 1 W input, respectively.

Tables

Generic image for table
TABLE I.

Modal beam characteristics from Eq. ((3)).

Generic image for table
TABLE II.

Single crystal modal projector characteristics.

Generic image for table
TABLE III.

Gain in level for the narrow cardioid mode for 1 W input.

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/content/asa/journal/jasa/129/4/10.1121/1.3559684
2011-04-08
2014-04-17
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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: The modal projectora)
http://aip.metastore.ingenta.com/content/asa/journal/jasa/129/4/10.1121/1.3559684
10.1121/1.3559684
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