Across Acoustics

Acoustic levitation allows objects to be suspended in air or in liquids without falling. In this episode, we speak with Philip Marston (Washington State University) about the history of acoustic levitation, and his work to translate previous research into terminology more accessible to modern readers and those outside of the field of physics. Associated papers: - Philip L. Marston. "Trapping in acoustic standing waves: Effect of liquid drop compressibility." J. Acoust. Soc. Am. 154, R5–R6 (2023). https://doi.org/10.1121/10.0020809 - Philip L. Marston. "Contrast factor for standing-wave radiation forces on spheres: Series expansion in powers of sphere radius." JASA Express Lett. 4, 074001 (2024). https://doi.org/10.1121/10.0027928. - Philip L. Marston. "Position dependence of the standing-wave radiation pressure quadrupole projection on a sphere applied to drop shape." J. Acoust. Soc. Am. 156, 1586–1593 (2024). https://doi.org/10.1121/10.0028518. Read more from The Journal of the Acoustical Society of America (JASA). Read more from JASA Express Letters. Learn more about Acoustical Society of America Publications. Music Credit: Min 2019 by minwbu from Pixabay.

This episode is part two of our interviews with the POMA student paper winners from our meeting in Ottawa. First, we talk with Miranda Jackson (McGill University) about her research regarding modeling the mouthpiece and bells of brass instruments. Next, Mark C. Anderson (Brigham Young University) talks about the noise created by the Falcon 9 boosters as they fly back to Earth and the impact that noise can have on surrounding communities. Associated papers: - Miranda Jackson and Gary Scavone. "A comparison of modeled and measured impedance of brass instruments and their mouthpieces and bells." Proc. Mtgs. Acoust. 54, 035004 (2024) https://doi.org/10.1121/2.0001925 - Mark C. Anderson, Kent L. Gee, and Kaylee Nyborg. "Flyback sonic booms from Falcon-9 rockets: Measured data and some considerations for future models." Proc. Mtgs. Acoust. 54, 040005 (2024) https://doi.org/10.1121/2.0001916 Learn more about entering the POMA Student Paper Competition for the Fall 2024 virtual meeting. Read more from Proceedings of Meetings on Acoustics (POMA). Learn more about Acoustical Society of America Publications.

This episode, we talk to a few of the latest round of POMA Student Paper Competition winners from the 186th ASA Meeting in Ottawa about their exciting research endeavors: - Using a small-scale ship-like structure to test noise mitigation techniques for shipping noise - Modeling spatial coherence in underwater sonar - Understanding the noise created by rotorcraft Make sure to keep an ear out for our next episode, which will include interviews with the remaining two winners! Associated papers: - Marc-André Guy, Kamal Kesour, Olivier Robin, Stéphane Gagnon, Julien St-Jacques, Mathis Vulliez, Raphael Tremblay, Jean-Christophe Gauthier Marquis. "Effectiveness of standard mitigation technologies at reducing ships’ machinery noise using a small-scale ship-like structure." Proc. Mtgs. Acoust. 54, 070001 (2024). https://doi.org/10.1121/2.0001912 - Kyle S. Dalton, Thomas E. Blanford, Daniel C. Brown. “Bistatic spatial coherence for micronavigation of a downward-looking synthetic aperture sonar.” Proc. Mtgs. Acoust. 54, 070002 (2024). https://doi.org/10.1121/2.0001924. - Ze Feng Gan, Vitor Tumelero Valente, Kenneth Steven Brentner, Eric Greenwood. “Time-varying broadband noise of multirotor aircraft.” Proc. Mtgs. Acoust. 54, 040006 (2024). https://doi.org/10.1121/2.0001946. Learn more about entering the POMA Student Paper Competition for the Fall 2024 virtual meeting. Read more from Proceedings of Meetings on Acoustics (POMA). Learn more about Acoustical Society of America Publications. Music Credit: Min 2019 by minwbu from Pixabay. https://pixabay.com/?utm_source=link-attribution&utm_medium=referral&utm_campaign=music&utm_content=1022

Current touchscreen technology has its limitations. In this episode, we talk with Jérémy Moriot (Université de Sherbrooke) about his team's development of an ultrasound-based system that not only can work with various types of surfaces, but can also detect multiple touches at the same time. Associated paper: Maxime Bilodeau, Jérémy Moriot, Joëlle Fréchette-Viens Raphaël Bouchard, Philippe Boulais, Nicolas Quaegebeur, and Patrice Masson. "Embedded real-time ultrasound-based multi-touch system." JASA Express Letters 4, 082802 (2024). https://doi.org/10.1121/10.0028323. Read more from JASA Express Letters. Learn more about Acoustical Society of America Publications Music: Min 2019 by minwbu from Pixabay.

When pulsed active sonar was found to cause mass strandings of whales, researchers turned to the quieter continuous active sonar for underwater monitoring. In this episode, Brian K. Branstetter (Naval Facilities Engineering Systems Command Pacific) shares his work to find out how this sonar affects killer whales. Associated paper: Brian K. Branstetter, Michael Felice, Todd Robeck, Marla M. Holt, and E. Elizabeth Henderson. "Masking in continuous sonar noise." J. Acoust. Soc. Am. 156 (2024). https://doi.org/10.1121/10.0025855. Read more from The Journal of the Acoustical Society of America (JASA). Learn more about Acoustical Society of America Publications. Music Credit: Min 2019 by minwbu from Pixabay.