Zobrazeno 1 - 10
of 273
pro vyhledávání: '"Thomas R. Howarth"'
Publikováno v:
The Journal of the Acoustical Society of America. 145:1863-1863
Thermophones are acoustic projectors powered by resistive heating elements. The thermophone was invented shortly after Alexander Graham Bell’s invention of the telephone, and since then, thermophone development has primarily focused around its use
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::33a52d6e3832cbc63c8b29cf6d7ea46d
https://doi.org/10.1121/1.5101729
https://doi.org/10.1121/1.5101729
Publikováno v:
Wave Motion. 48:505-514
Transformational acoustics offers the theoretical possibility of cloaking obstacles within fluids, provided metamaterials having continuously varying bulk moduli and densities can be found or constructed. Realistically, materials with the proper, con
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::fabb26115f71c6b9bd0ac004b13b43c0
https://doi.org/10.1016/j.wavemoti.2011.02.007
https://doi.org/10.1016/j.wavemoti.2011.02.007
Autor:
Michael Warnock, Thomas R. Howarth
Publikováno v:
The Journal of the Acoustical Society of America. 144:1846-1846
With the advent of relaxor single crystal materials, such as lead indium niobate-lead magnesium niobate-lead titanate (PIN-PMN-PT) and lead magnesium niobate-lead titanate (PMN-PT), it was discovered that the highly oriented crystal structure of the
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::6c4e6c74c7b04c547d16e993ff272924
https://doi.org/10.1121/1.5068129
https://doi.org/10.1121/1.5068129
Publikováno v:
The Journal of the Acoustical Society of America. 127:2856-2864
While receiving less attention in the literature than electromagnetic cloaking, theoretical efforts to define and create acoustic cloaks based upon mimicking coordinate transformations through use of metamaterials is of interest. The present work ext
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_dedup___::7c39347bfdc4927fc04c1d3c68494c1e
https://doi.org/10.1121/1.3365248
https://doi.org/10.1121/1.3365248
Publikováno v:
The Journal of the Acoustical Society of America. 116:1536-1543
A thin, lightweight oil-filled electroacoustic projector has been designed and fabricated for application on unmanned underwater vehicles (UUVs) and autonomous unmanned vehicles (AUVs) used in littoral environments. The projector has dimensions of 38
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::751b4d453201359d216388c2114a5fbe
https://doi.org/10.1121/1.1778742
https://doi.org/10.1121/1.1778742
Autor:
Thomas R. Howarth, James F. Tressler
Publikováno v:
Journal of Electroceramics. 8:175-186
The performance of two different ‘cymbal’ actuator-based underwater acoustic projector designs is compared. One projector design is a 101 mm by 101 mm Thin Panel potted in polyurethane. The other is a 152.4 mm by 76.2 mm tungsten-backed flat pane
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2b315e7bcc7fb9240f5ab055d91c35f4
https://doi.org/10.1023/a:1020564215228
https://doi.org/10.1023/a:1020564215228
Autor:
Thomas R. Howarth
Publikováno v:
The Journal of the Acoustical Society of America. 99:2536-2574
A selection of different 1‐3 piezocomposite materials has been fabricated and tested. Each of the 1‐3 piezocomposite materials that will be presented was fabricated by the Material Systems Inc. of Littleton, MA. The materials selection includes v
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::f01068f87b285272af43a147f71c2bb0
https://doi.org/10.1121/1.415819
https://doi.org/10.1121/1.415819
Autor:
Donald L. Cox, Jeffrey E. Boisvert, Thomas R. Howarth, Dehua Huang, Ali E. Aliev, Christian R. Schumacher, Ray H. Baughman, Nathanael K. Mayo
Publikováno v:
The Journal of the Acoustical Society of America. 140:3086-3086
Traditional acoustic transduction sources typically begin with the generation of an electrical excitation pulsed through an amplifier into an electroacoustic material to create a mechanical vibration which is then converted into an acoustic wave to p
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::2d404463cb1edd83853282c6bb83aaf7
https://doi.org/10.1121/1.4969616
https://doi.org/10.1121/1.4969616
Publikováno v:
The Journal of the Acoustical Society of America. 93:1613-1619
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::1b6c4e3454cd5a79257a8c0dfa8dc07d
https://doi.org/10.1121/1.406820
https://doi.org/10.1121/1.406820
Publikováno v:
The Journal of the Acoustical Society of America. 91:823-831
An active acoustic coating is presented for layering over objects in a fluid medium. The design of the active coating prevents an incident sound wave from reflecting off the acoustic boundary of a submerged object. The acoustic energy associated with
Externí odkaz:
https://explore.openaire.eu/search/publication?articleId=doi_________::0b4fe1290ade0b227d2c5f4321f801b0
https://doi.org/10.1121/1.402542
https://doi.org/10.1121/1.402542