Researchers at the German Aerospace Center (DLR), working at Turbomeca’s test facilities in Bordes, France, have managed to measure the noise inside a helicopter engine. They used new hot-gas microphone probes in an environment of high pressure (up to 12 bar) and high temperature (up to 1,200 degrees C). The microphones were installed at various places inside the engine and around the exhaust. Their signals were recorded simultaneously. Analysis of the noise field enabled the DLR to explain how noise is generated and how sound propagates.
Aerocon Engineering has signed a contract with an undisclosed customer to design a cabin noise-reduction system for a head-of-state 747-8i.
According to CEO Benny Younesi, the Van Nuys, Calif.-based company’s latest system upgrade will be “lighter, more efficient, more cost effective and easier to maintain.” The company intends to seek STC approval from both EASA and the FAA.
Chemical giant BASF is claiming its Basotect open-celled melamine foam is both improving sound insulation and saving weight in the Russian Helicopters Mi-8. Used for an executive cabin refurbishing, it has cut interior noise from 85 to 80 dB. It has also saved 530 pounds, compared with the previous insulation arrangement. The special foam is affixed to “selected noise-intensive points,” at a thickness of 40 mm.
A new noise-cancelling headset introduced in April at the Aircraft Interiors Expo in Hamburg, Germany, is set to find a market in business and private aviation.
Middletown, R.I.-based Avid claims the headset “effectively reduces environmental external noise by 85 percent with a 20-decibel maximum noise attenuation.” Forty-millimeter speakers, said an Avid spokeswoman, “ensure crisp, clear sound and well defined bass.”
Sennheiser raised the stakes in the high-end, active-noise-reduction (ANR) headset game with the release of the S1 Digital at the EAA AirVenture show in Oshkosh, Wis. this week. Regular price for the S1 is $995 for the rest of this year, then $1,095. In August, Sennheiser will offer an optional XLR 3 power adapter and a 12-volt cigarette lighter adapter (including an extra female adapter) for the S1.
Lightspeed Aviation unveiled its next-generation Zulu headset last month at the Sun ’n’ Fun Fly-In. The new Zulu introduces several features, including “Microport Vent” technology that provides greater active-noise-canceling consistency, better fit and an improved microphone that adds more voice clarity and improved noise-canceling capability.
Fans of Bose’s noise-canceling headsets might want to stop by the company’s NBAA booth (No. 6068) to try out the A20. Introduced at the EAA AirVenture show in Oshkosh in July, the $1,095 (retail) headset incorporates some significant improvements from the original Bose Aviation Headset X, which pioneered noise-canceling for aviation headsets when it hit the market 12 years ago.
Quiet Technology Aerospace (Booth No. 4614) has the most Gulfstream II/III hush kits installed, with more than 75 done so far. The Opa-Locka, Fla. company’s Stage 3 hush kit can be installed by a maintenance center of the customer’s choice and takes 10 days or less, according to director of engineering Martin Gardner.
Bose introduced its long-awaited A20 noise-canceling headset at the EAA AirVenture show in Oshkosh in July and attendees immediately began snapping up the $1,095 (retail) headset. The A20 launch comes 12 years after Bose introduced the Aviation Headset X, spawning keen competition in the headset market and convincing pilots that noise-canceling plus passive sound deadening is the way to fly.
Quiet Technology Aerospace (QTA) has the most Gulfstream II/III hush kits installed, with more than 75 done so far. The Opa-Locka, Fla., company’s Stage III hush kit can be installed by a maintenance center of the customer’s choice and takes 10 days or less, according to director of engineering Martin Gardner.