Acoustics

Andrew Griesmer | December 18, 2012

SOund NAvigation Ranging, or Sonar, has been an important part of naval warfare and since the 1950’s. Although it is a relatively simple way to locate objects, it’s the best for doing so in water, emitting sound waves and listening for echoes made by objects in the water. In today’s world of undersea warfare, the threats and the necessary responses to them are becoming more important and urgent. Sonar systems are required to detect these threats, making it necessary for […]

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Fanny Littmarck | December 12, 2012

A while back, I wrote about permanent magnet generators and how they generate electricity upon being set in motion. When browsing the papers from our conference in Bangalore, one on the topic of ultrasonic micro motors caught my eye. These motors are electromechanical in nature and instead initiate motion with the application of an electric voltage. Furthermore, these motors are miniaturized to fit a micro-scale environment.

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Andrew Griesmer | November 29, 2012

Growing older is an inevitable part of life, and with it, our body slowly begins to show that. I recently started wearing eye glasses because my eyesight is weakening. It’s a little unnerving, but I am comforted by the ever-improving technology being produced. My hearing is still fully intact, but the same cannot be said for 17% (36 million) of American adults who report some degree of hearing loss. In most cases, regular hearing aids are sufficient in treating hearing […]

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Phil Kinnane | June 29, 2012

In an earlier blog post, I commented on how acoustic waves are being used in a biomedical setting, to identify malaria in small fluid samples. A more traditional use of piezoelectric devices was written about in the latest COMSOL News. Here, an Italian company, Esaote S.p.A., uses them to produce improved ultrasound imaging systems.

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Phil Kinnane | April 9, 2012

Wind turbines are an expensive investment and once they’re up, they’re up. An article from last year’s COMSOL News points to how modeling can also help in remedying problems, if it’s too late to have built the perfect design from the beginning. With wind turbines, noise is of course the problem.

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Phil Kinnane | April 4, 2012

I had previously blogged about Thermal Cloaking, which uses layers of aluminum and paper to create an anisotropic structure and cloak a desired object. This differs from the “traditional” type of cloaking, of light and electromagnetic waves, which make use of metamaterials or layered structures that impose a negative refractive index to make the cloaked object appear transparent.

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Phil Kinnane | March 19, 2012

While you may think that the prevalence of lightning strikes, would be a reason for not wanting wind turbines in your backyard, noise is apparently another reason. While this has become less of a problem in recent years, the noise is still there, and is always there whenever the wind blows.

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Phil Kinnane | March 8, 2012

Many devices live with a dry, technical name that either basically says what the device does, or is an acronym of that dry, technical name. Very few get a nickname that sticks to become the industry standard.

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