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

Technology

59428 readers
3141 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@lemmy.world
L3s@fry.gs
L4s@fry.gs
L4s@lemmy.world
enu@lemmy.world
602
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
172 comments fedilink hide all child comments
you are viewing a single comment's thread
view the rest of the comments
[–] curiousPJ@lemmy.world 6 points 6 months ago* (last edited 6 months ago) (1 children)

I wonder if that shares the same physics as silvent's compressed air guns.

Silvent’s air nozzles reduce the sound level when blowing with compressed air compared to blowing through open pipes. This is due in part to the reduction in noisy turbulence from using Silvent’s air nozzles, and also because of the nozzles’ special design. Silvent’s air nozzles pass the compressed air through small holes and slots, which raises the sound to frequencies beyond what the human ear can perceive. This allows us to make blowing with compressed air both quiet and efficient.

Could use an even quieter compressed air gun

[–] A_A@lemmy.world 6 points 6 months ago

No, not the same ... in your paragraph you describe an increase of the frequency at a level human hearing do not perceive while the other made cancellation of a given frequency using phase shifting and recombination.