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Hearing is be-leafing: Students invent quieter leaf blower (hub.jhu.edu)

submitted 6 months ago by TheReturnOfPEB@reddthat.com to c/technology@lemmy.world

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[–] A_A@lemmy.world 165 points 6 months ago (7 children)

what they did :

"Our product takes in a full blow of air and separates it," said team member Leen Alfaoury. "Some of that air comes out as it is, and part of it comes out shifted. The combination of these two sections of the air makes the blower less noisy."

Adds Chacon: "It ultimately dampens the sound as it leaves, but it keeps all that force, which is the beauty of it."

Their design cuts the most shrill and annoying frequencies by about 12 decibels, which all but removes them, making them 94% quieter.

[–] cactusupyourbutt@lemmy.world 14 points 6 months ago (4 children)

wtf is shifting?

[–] gravitas_deficiency@sh.itjust.works 30 points 6 months ago (3 children)

The wording is comically awkward and imprecise. But if I had to guess, they figured out a way to fiddle with how the air is routed through the secondary portion such that the emitted noise is phase-shifted to cancel out the frequencies they’re targeting.

[–] dditty@lemm.ee 13 points 6 months ago (2 children)

Seems baffling

[–] Tyfud@lemmy.world 4 points 6 months ago

Eeeeeeeeeeyyyyyy

[–] gravitas_deficiency@sh.itjust.works 2 points 6 months ago

But you can’t deny it has a certain flow to it

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