this post was submitted on 16 May 2024
602 points (97.9% liked)

Technology

59731 readers
2440 users here now

This is a most excellent place for technology news and articles.

Our Rules

  1. Follow the lemmy.world rules.
  2. Only tech related content.
  3. Be excellent to each another!
  4. Mod approved content bots can post up to 10 articles per day.
  5. Threads asking for personal tech support may be deleted.
  6. Politics threads may be removed.
  7. No memes allowed as posts, OK to post as comments.
  8. Only approved bots from the list below, to ask if your bot can be added please contact us.
  9. Check for duplicates before posting, duplicates may be removed

Approved Bots

founded 1 year ago
MODERATORS
L3s
[email protected]
[email protected]
L4s
enu
602
Hearing is be-leafing: Students invent quieter leaf blower (hub.jhu.edu)
submitted 6 months ago by [email protected] to c/technology
172 comments fedilink hide all child comments
you are viewing a single comment's thread
view the rest of the comments
[–] A_A 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 14 points 6 months ago (1 children)

wtf is shifting?

[–] [email protected] 30 points 6 months ago (1 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.

[–] [email protected] 13 points 6 months ago (2 children)

Seems baffling

[–] Tyfud 4 points 6 months ago

Eeeeeeeeeeyyyyyy

[–] [email protected] 2 points 6 months ago

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

load more comments (5 replies)