Loud helicopters have become a big problem in major cities such as New York or Los Angeles. Sound of flying machines accompanies residents for family dinner, during a walk in the Park — in a Word, always. Helicopters here actively using police, ambulance, news agencies, sightseeing companies and many other services. Residents of American megacities such an order of things not satisfied, therefore considered options to limit the use of helicopters in the cities.

However, there is good news: the problem took a researcher from NASA Langley Research Center Eric Greenwood. Greenwood specialises in helicopter technology research. He developed a technique called FRAME (fundamental experiment on acoustic modelling of Technics helicopter), which soon will help us get rid of the irritating noise vertolëtnogo.

FRAME works with two key elements: understanding vertolëtnogo noise and analysis of collected data during test flights. Using the knowledge of physical laws when examining the data collected, Greenwood can accurately predict the change in the level of noise during the flight.

The results of its work to the researcher presented a paper at the annual World Congress of 71 American vertolëtnogo society. As it turned out, the FRAME can accurately predict the change in the level of noise in any maneuver during the flight.

The special nature of vertolëtnogo noise is the result of the so-called lopastno-Vortex interaction. When the helicopter blade enters the Vortex trail formed another Blade, there is a well-known us pulsating sound. Now, when the FRAME can predict the emergence of such noise, the inhabitants of large cities can finally breathe calmly.

“Our model has been recognized as valid, and we hope that in the near future it will be used to create a guide for pilots helicopters, enabling them to fly quieter,” said Greenwood. — For example, the pilot can perform the right rotate in different ways. Guide will tell him how to do it to minimize the noise. ”

Naturally, the development of Greenwood and military as well. The same rules that will reduce complaints of noise in Las Vegas, will help the military morgue in inconspicuous to enemy.

But regardless of where the new method will be applied — in civil or military aircraft — Greenwood hopes that his research will open the door to a future where the helicopters will be equipped with built-in computerized control system for noise reduction.

“Imagine you helicopter pilot and want to make” loud “maneuver. The resistance of the wheel in this case will become noticeably stronger, “said Greenwood. You can still continue to implement planned maneuver, but the system tells you how to avoid loud noise “.


In: Technology & Gadgets Asked By: [15576 Red Star Level]

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