Improving Noise Reduction in Airbus Engine Nacelles

In summary: Sort of. It's quieter overall, but it's not as quiet as you might think because there are other noises that are masked.
  • #1
verdigris
119
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This may be of interest to readers:
http://www.flightglobal.com/articles/2007/01/23/211641/airbus-a350-xwb-set-to-be-quietest-generation-of-airliner-as-manufacturer-improves-zero-splice.htm

A noise reduction engine nacelle intake. "A zero splice liner with a continuous surface and lacking the distinct joins that exist on conventional liners."

How do liners reduce the noise and why is this one an improvement?
 
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  • #2
Liners are accoustic barriers. Especially around fan tips where there are usually some pretty complicated aerodynamic things happening. The whole idea of the single piece is that the seams, no matter how tight you make them, are sources for resonance and transmission. It is very impressive that they figured out a way to do it in a single piece. That is no easy task and to have the composite properties come out properly.
 
  • #3
  • #4
So does the noise get focused in one direction instead of spreading out when a liner is used? And is the liner of uniform thickness or thicker where the engine noise is greatest? Do the noisiest places in the engine occur at different locations as engine speed changes?
 
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  • #5
The noise doesn't really get focused. It just isn't impeded. Of course, the nature of the noise is dependent on the conditions and frequencies. It depends highly on the engine. The two big hitters on most engines, is fan tip pass (fan noise) and exhaust gas noise. Exhaust noise was effected greatly by the invention of the turbo fan that reduced exhaust temperatures and velocities. Our engines can have a pretty decent whine to them under certain conditions because of the fan tips. Other components do contribute but not as much as the two stated.
 
  • #6
FRED GARVIN said:
"The noise doesn't really get focused. It just isn't impeded"

So there's just as much noise but it makes a nicer sound?
 

What is Airbus engine noise reduction?

Airbus engine noise reduction refers to the technology and techniques used by Airbus to reduce the noise produced by their aircraft engines during flight. This is important for the comfort of passengers and to comply with noise regulations in different regions.

How does Airbus reduce engine noise?

Airbus uses a combination of design elements and technology to reduce engine noise. This includes using advanced materials, improved aerodynamics, and active noise control systems. They also employ noise-reducing technologies such as chevrons, which are serrated edges on the engine exhaust that help to reduce noise.

Why is reducing engine noise important?

Reducing engine noise is important for several reasons. Firstly, it improves the comfort of passengers and reduces noise pollution for those living near airports. Secondly, it allows airlines to comply with noise regulations set by governments and airport authorities. Finally, it can also lead to fuel savings as a quieter aircraft may require less thrust during takeoff and landing.

How effective is Airbus engine noise reduction?

Airbus has made significant strides in reducing engine noise in their aircraft. According to Airbus, their latest planes are up to 50% quieter than previous generation aircraft. However, the effectiveness of noise reduction may also depend on other factors such as the environment and flight conditions.

Are there any drawbacks to reducing engine noise?

While reducing engine noise is beneficial in many ways, there are some potential drawbacks. One of the main concerns is the added weight and complexity of noise reduction technology, which can lead to increased fuel consumption and maintenance costs. There is also the possibility that the added weight can affect the performance and efficiency of the aircraft. However, Airbus continuously works to balance these factors while striving for quieter and more efficient aircraft.

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