Listening up in the Navy means not just paying attention but being cognizant of the deafening sound emanating from F-18 fighter jets that sometimes fly over residential areas. Starting in December of 2002, noise generated from F-18 engines at full throttle will approach half of what it was at the start of the year thanks to a patent-pending technology developed by Anjaneyulu Krothapalli, the chair of Florida State University's Department of Mechanical Engineering. He reduces noise by siphoning off some of the air travelling through the jet engine and forcing it at high pressure through multiple microjets that fan around the engine's large exhaust. Noise is reduced when the small jets of high-pressure air hit the large stream of lower pressure engine exhaust. "Right now we are trying to figure out the optimum number of microjets that will best suppress noise," says Krothapalli. So far he has achieved a 5-decibel (dB) reduction, but he hopes to achieve a 10-dB noise reduction soon. Krothapalli also reduces noise by forcing water and other liquids through the microjets in place of air. His noise suppression lab uses compressed air at 2,000 psi for simulating running jet engines. In a separate chamber, he measures noise. For more information, call Krothapalli at (850) 644-5885 or (850) 410-6338.
Imagine being able to illegally download a physical product the same way you can with music and videos. That’s basically what’s happening with 3D printing and digital manufacturing, with huge repercussions in the intellectual property domain.
Ford will be the first automaker to commercially use Alcoa's tough & fast Micromill aluminum alloy process and materials, debuting on several 2016 F-150 truck components. Alcoa will also license its Micromill process and materials technology to Danieli Group.
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