It is vital for automotive engineers to identify the dominant noise sources such as engine noise, exhaust noise and noise due to vibration transmission inside of vehicle.
Another trick is using chevrons – scalloped edges – on the engine exhaust nozzle, to help muffle engine noise at the source, according to Mahendra Joshi, Boeing's chief engineer for noise, vibration and emissions.
According to the sound engineer, the noise from the well-behaved crowds had to be boosted in the mixing process.
Still, single-layer porous surfaces are successful in the European countries visited, says Christopher Corbisier, a civil engineer and noise specialist with the Federal Highway Administration who took the recent tour.
Carmakers already take engine noises seriously enough to use acoustic engineers to tune exhaust pipes, especially for high-performance cars.
So Douglas and his engineers created noise cancelation technology.
Rather than blindly growing out, the festival, now in its fifth year, seems to have grown further in; calling in more and more of the underground — perfectly curated, precision engineered, niche noise.
Lionel sent a sound engineer to record noise in Brooklyn subway tunnels and on modern subways.
On the theory that porpoises are sensitive to noise, engineers and biologists developed beer-can-size devices that emitted pinging noises underwater.
It was essentially an unfinished metal structure, gutted by artillery, train tracks, and locomotives that called to mind the railroad built by Stanley, cassava fields, cut-rate hotels, greasy spoons, bordellos, Pentecostal churches, bakeries, and noise engineered by men of all generations and nationalities combined.
