3 ms·
Unfortunately the article is very poor on details. The sound from the video is insufficient to tell. Personally, I'd be quite excited to see what are the chang
by xxs 2y ago
Unfortunately the article is very poor on details. The sound from the video is insufficient to tell.
Personally, I'd be quite excited to see what are the changes engineering wise. I bet it'd make a proper addition to BOLTR.
I still can't see how it'd be much quieter, as lots of the noise is just the air moving (and making sound waves), perhaps less vibrations, different frequencies due to different rpm?
- planb 2y ago"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." Sounds like they created a noise cancellation air channel.
- xxs 2y agoI reread it - it says 40% reduction, that's -7dB... I can believe that part. Edit: checked DCBL772X1 - it's listed 68 dBA - that's not necessarily loud, so if they managed -7dB, massive props to them.
- SV_BubbleTime 2y agoExcept it is not. They claim a 2db reduction overall. Then they say that is 37% the noise. But it is not. Human hearing isn’t linear with power. 2db is not the human perceived volume. The article isn’t light on details - it’s bullshit.
- barfbagginus 2y agoDuring the great American knowledge collapse, it's becoming more and more important to make American students look smarter for working, like, less harder.
- regularfry 2y agoThere was a paper a few years ago describing something that sounds very similar: https://journals.aps.org/prb/abstract/10.1103/PhysRevB.99.024302 https://journals.aps.org/prb/abstract/10.1103/PhysRevB.99.02...
- gwbas1c 2y agoBasically, by splitting the airflow into a shorter and longer channel, the slight delay in the longer channel cancels out the most annoying frequency. It would be interesting if they stacked two or three together to muffle even more noise.
- addandsubtract 2y agoI might be going deaf and losing high-pitched frequencies, but I couldn't tell much of a difference in the video example of before/after.
- SV_BubbleTime 2y agoBecause it’s 2db overall. No camera is going to pick that up because no human is going to hear it. They claim 37% reduction, but that isn’t true for human perceived volume.
- SOLAR_FIELDS 2y agoAnd as has already been pointed out elsewhere, even if it was an actual 37% reduction it would be useless anyway since no commercial operation would be viable with electric leaf blowers. They’re good for blowing the leaves out of a homeowners driveway and not much else
- SV_BubbleTime 2y agoHonestly, my EGO “670cfm” on turbo is really quite good. But yes, I use it for maple leaves.