NASA Boeing & NASA makes 'quiet' advances

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Boeing's noise-reduction efforts are showing promising results, particularly from tests conducted at a remote airfield in Montana, where a 777 equipped with chevron engines produced noise levels comparable to a single engine without chevrons. The technology being developed is expected to be integrated into future aircraft models, including the 787 and the 747 Advanced. Discussions in related forums highlight the complexity of chevron designs, noting that various configurations can yield differing noise outcomes. Insights from ongoing research at Glenn are generating unexpected results, although specific data remains limited. Overall, advancements in noise reduction technology are advancing in the aerospace sector.
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Boeing makes 'quiet' advances
Noise-reduction efforts pay off at remote airfield in Montana

By JAMES WALLACE
SEATTLE POST-INTELLIGENCER AEROSPACE REPORTER
http://seattlepi.nwsource.com/business/236095_quietjet11.html
During tests at the Glasgow site with a 777 in 2001, Boeing found that two engines equipped with chevrons made no more noise than a single engine without the chevron.

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Technology being tested on this Boeing 777 in Montana is expected to find its way into 787s, due to enter service in 2008, and the 747 Advanced. (August 11, 2005)

Credit: James Wallace/Seattle Post-Intelligencer
 

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It's not as simple as they say. If you look at the actual research, many different chevon styles and configurations were used. Some produced 'more' noise than baseline, some produced the same, some produced less.
 
minger said:
It's not as simple as they say. If you look at the actual research, many different chevon styles and configurations were used. Some produced 'more' noise than baseline, some produced the same, some produced less.
Please provide a link to that reseach if possible.

This link looks interesting, lots of pretty charts and pictures.

http://adg.stanford.edu/aa241/noise/noise.html
 
My graduate adviser works at Glenn. He's been keeping us up to date on this work. I don't have any raw data, just what he's been telling us.

From what he says though, the results are very interesting and many times unexpected.
 
Don't get anyone fired.
 
Coincidentally, I will be at the very same facility tomorrow for some of the same testing we are going to be undertaking.
 
FredGarvin said:
Coincidentally, I will be at the very same facility tomorrow for some of the same testing we are going to be undertaking.

I'm guessing they will make you check in your camera phone at the front desk.:cool:
 

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