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I want the stl!
seems like snake oil. whe using my electric leaf blower all the noise sounds to be coming from the big fan at the top of the device and not the nozzle
Now pretend your electric blower is actually a super loud and inefficient two stroke motor.
The movement of air isn’t noisy, the motor is.
Yeah, I thought this was for those pieces of shit.
I’m sure electric ones are being used around my city, but that’s not the ones I notice.
Ah spring! Flowers blooming, bird songs… BRAAAAAAAAAAAAAAAAAAAAAA… Goddamn leaf blowers.
Are the majority of people who use leaf blowers regularly really going to buy/use these?! I think the leaf blower droning is almost a relaxing noise to me but those god forsaken commercial mowers are a little annoying
Removed by mod
I prefer Lucifer 🤣 just saying chain saws and weed eaters are pretty rufff
I’ll wait until I can 3d print my own. I’m not paying for a hunk of plastic.
Lol what do you put into your 3d printer?
A string of plastic, not a hunk =D
Fair!
Let me help you with the correct wording: ‘Power to noise’-converters. You’re welcome.
Good. I fucking hate leaf blowers.
If it were me that designed this, I would license out the design for manufacturers to use in their production models instead of making some kind of attachment that is unlikely to work on all models. That seems much more likely to achieve the goal of reducing noise from leaf blowers long term. Get like 3 manufacturers on board that could even charge a premium, and you have reduced the noise potentially forever while still making a tidy profit.
Why not just use a rake and a broom?
You ever raked am acre? Or three? Ten?
I didn’t say you had to do it all on your own.
So it’s taking some of the air out of the stream, slowing it down, and putting it back in the stream… How does this not affect the performance?
was posted 3 days ago in /c/Technology, here :
https://lemmy.world/post/15468260
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.”
… “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.
Just saying it doesn’t decrease the power is a norm claim without providing anything technical to support it.
I’ve read multiple articles and videos and yet this very crucial information is intentionally not included.
The claims are false, you can’t suppress or mute something with a tradeoff, unless they have somehow magically figured out physics anomalies.
You being downvoted is pretty crazy… Your statement is valid
There’s a relevant physics anomaly called a Helmholtz resonator, or more broadly waveform interference.
Are you saying novel mechanical engineering designs are impossible? That the mechanism of a leaf blower is so near perfection, that a well funded team of 4 mechanical engineering students could not, without VIOLATING THE LAWS OF PHYSICS, have simply found a better mechanism?
I agree with your “show me the numbers” critique, but I find your complete disregard of what may be a better answer without any data at all to be equally foolhardy.
I am saying every single one of these claims have never wound up being actually true since they go against the very nature of physics. Yet people perpetuate the claims and defend them without the supporting data.
So to not provide the data for one claim, while providing the data for another is only done to mislead from the truth.
Sorry for not accepting what they say at face value since it goes against multiple things.
never wound up being actually true since they go against the very nature of physics.
This is an incredibly wild statement when you have no data on the device’s construction or operation.
Youre complaining about a lack of data then making wild assumptions about it with no data.
Not exactly a good scientific method here, mate.
It’s a wild statement to claim it doesn’t reduce power when even increasing the length of the discharge tube would affect its performance, and they’ve added a good 8”. Every time like this comes out without the data to back it up, it’s always false, everytime. If it wasn’t the data would be provided now wouldn’t it? Even just showing the CFM data would be enough, but they purposely omit it.
The fact that they purposely omitted data that they have is extremely concerning, it’s not a bold claim say it’s obviously false. It’s bold to claim something like that that goes against what we already know about physics.
I am sorry you are eating up this “marketing”, it’s why products like this are even sold, it’s hilarious, the amount of people defending this asinine claim is honestly quite shocking, especially on a community like this.
Not exactly a good scientific method here, mate.
Uhh… I’m not the one making claims that goes against common knowledge of aerodynamics and then not providing that data. So sure, wanting someone to prove their claim makes me bad at scientific method…?? Maybe the people defending bullshit claims are the ones you should be calling out, oh wait that you yourself. Give you head a fucking shake lmfao.
You’re right to be sceptical until more data is presented, but saying no claim of progress is ever true is quite obviously a gross misrepresentation of our current reality. You are doing this on digital devices interconnected with millions of users ar staggering speed and latency. Every part of which are scientific claims.
Every claim where they omit the actual data to support the claim is never fully true. Provide the CFM testing data they must have to even make that claim.
There is no valid reason to omit that data unless to mislead.
Unfortunately I don’t agree.
Good reasons to omit details include brevity, legibility, pedagogy and scope.
Showing the supporting evidence for all steps in an evidence chain is simply not feasible, and we commonly have to accept that a certain presupposed level of knowledge as well as ambiguity is necessary. And much of the challenge is to be precise enough in the things that need precision.
They provided the DB data so your argument for all of those reasons is invalid. They could have easily spent a single sentence providing the CFM data. So no, not a single one of those reasons is valid to omit 6 words.
They made a claim, they didn’t need to mention the power claim, but they did. They should have omitted the claim itself using your logic, instead of the supporting data. The argument is flawed itself.
and we commonly have to accept that a certain presupposed level of knowledge as well as ambiguity is necessary.
Like knowing making a discharge tube longer or shorter affects its aerodynamics….? So we know the claim is false already…? Their ambiguity is meant to mislead people with zero working knowledge of the subject… anyone with any experience will see its flaw immediately.
He has a point though… OVERALL noise was only suppressed 2db. It’s only 12db in a specific frequency. EVERY article has more or less ONLY stated the 12db value. It seems more and more these days that you just have to assume that the article headline is at best mostly false, or obscenely misleading.
2db overall… is kind of fucking pointless. I mean… as someone afflicted with hearing problems I know that every db matters. But all this hubbub for something that should just be found, then implemented without all this fanfare… the general public will not care about this, yet I’ve seen 3 articles on it for some reason.
And most normal people don’t understand the logarithmic nature of the db scale anyway. Every 3 db is technically a doubling in power. But it takes 10db for our perception to halve/double.
Taking out the high-pitch whine will make them much more bearable. It’s a student project, they did well. This isn’t groundbreaking Noble-prize stuff, but it doesn’t deserve all the hate it’s getting here either.
but it doesn’t deserve all the hate it’s getting here either.
I’m not sure I said anything hateful here… I cited facts from the actual paper and described discontent with the articles, specifically the headlines.
The hate is for making a pretty obviously false claim about no power loss. Increasing or even decreasing the exhaust length will affect performance. So for them to add 8” and claim there is no loss of power is quite frankly an outright lie. So it’s being called out, and yet people are defending the asinine claim, it’s hilarious and very concerning as well.
People are also focusing on the wrong information, the total db was reduced by a paltry 2db, not 12db like what’s being talked about.
So they provide sound data that is misleading, and make a claim about power and not provide the data. This just reads marketing piece instead of anything on the actual tech.
Agreed. Being in the house and having the shrill component of the blower removed would greatly be appreciated.
They also run between 60 and 100dB, so knocking that down to 48 and 88dB respectively is fucking useless
Because leaf blowers are fucking annoying and we need hope
Destructive interference is a thing. The energy of the vibrations doesn’t go away, however you CAN shift that energy into different frequencies and destructive interference done correctly will effectively shift it into so high frequencies that the vibrations are better compared with heat than with sound (what is heat convection anyway if not extremely high frequency sound? :)
Even increasing or decreasing the length of the discharge tube will change its power and CFM and they’ve added 8”. There is no way the aerodynamics and the overall performance isn’t affected.
12dB is literally nothing in reduction when the lawn dudes are blasting 60-100db
Eh, I’ll take it though. I live in a fairly quiet part of town but the street has gotten pretty busy in the last could of years. And visually, I guess the street seems to open up making drivers get… spicy now and then. The fucking motorcycles, man. These noisy fucking middle-aged infants making 130 decibels while only going 15mph make me see red. I’d gladly take the lawn equipment noise.
The team reduced the overall leaf blower noise by about two decibels, making the machine sound 37% quieter.
It’s an insignificant 2db, I don’t know why buddy didn’t provide the relevant information.
Decibels are a logarithmic scale, so it scales exponentially. Because of this, reducing by just ten is actually very significant and would reduce the perceived volume by half, and would reduce the actual sound pressure even more than half.
The team reduced the overall leaf blower noise by about two decibels, making the machine sound 37% quieter.
It’s an insignificant 2db, I don’t know why buddy didn’t provide the relevant information.
Decibel scale is logarithmic, which means 10db change is reducing perceived volume by half.
No. It means the sound energy is dropped by half. Our audio perception is also logarithmic however. It’s why we use db.
Almost. a 10db change is a 10x difference in power and roughly 2x difference in perceived loudness
Except if you read the information its only actually a 2 db decrease…
There’s no way this won’t affect the final CFM or Velocity of the air.
This would be no different than running it at a little less than 100% power, but wastes that energy instead.
Why else would they not provide any technical detail, even a wind velocity test would be huge FFS.
They wont release anything because the design is being sold to black&decker, yay
As soon as it’s out to market someone will clone it and have an STL available
it literally doesn’t matter because most people don’t 3D print
Ok?
no.
see my comment above.I’ve read the article attached, the article linked in that, and the video linked as well.
Not one talks about anything technical other than it doesn’t decrease the power, so where’s the stats to prove it? You can’t silence or muffle something without a tradeoff, we ignoring basic physics here?
So what is it do your think your non-informational comment is proving? Theres no test information to support the non power diminishing claim, and I call bullshit from basic physic principles.
I still say replace them with rakes.
I get what you’re saying, but leaf blowers are also commonly used for cleaning up extra grass clippings from the roads, etc.
MAKE GAS LANDSCAPING TOOLS ILLEGAL
Give away free electric tools if they trade in their gas ones. It’s so bad for health to be huffing 2 stroke fumes all day every day.
“Electric leaf blowers are already far quieter than their gas-powered peers, but they still aren’t the kind of thing you’d like to hear first-thing on a Saturday morning. Looking to improve on the situation, a group of students from Johns Hopkins University have successfully designed a 3D printed add-on that manages to significantly reduce the noise generated by a modern electric leaf blower without compromising the amount of air it’s able to move.”
First two sentences of the article.
I don’t know mate, I wouldn’t replace my electric tools–drills, grinders, saw… with gas ones. But these outdoors tools are a different kind of beast. I’ve only used an electric chainsaw and it was an absolute crap, maybe there are better ones but it was crappier than the smallest and shittiest gas chainsaws I’ve used, and a cord around you in that setting isn’t great either.
The problem with electric gardening tools is they aren’t that feasible for contractors.
Batteries don’t last long and take a long time to charge, so it’s just not an option when you’re working all day. Corded means at every location, you have to figure out outlets, extension cords, fuss with tangles and obstructions, etc.
If you’re doing your own lawns, yeah, you can probably get into a workflow that works for you. But a lot of people hire out for landscaping.
Swappable batteries resolve this issue pretty well. The energy density is far from comparable, but if you’re already hauling a van or trailer to the job site, then a dozen spare batteries isn’t an issue.
Except being very expensive, wear out after a few years (at best), and being sensitive to being in the hot sun all day every day. All in a profession mostly worked by under privileged people where frugality is a necessity of life.
Most batteries have 5 year warranties.
Gas being a better energy source than batteries in every way except for the health and environmental issues is a real bitch and why this is such a problem. Cords are a hassle and you will need a lot recharging batteries all the time, so you notice the downsides immediately and acutely. These are solvable problems though. Even running an efficient gas generator would be better for the health of landscaping contractors than being around 2 strokes all day.
Not true, keep extra batteries and put a solar panel on your rig (vehicle or trailer) to charge the dead ones while you work. Maybe keep a battery generator for cloudy days.
They already are in many communities. Enforcement is an issue.
Why do leaf blowers exist in the first place?
To blow leaves.
And clean up after mowing.
I often see those things with a sack on public workers here. They suck leafes. 🤯
So annoying twats can be annoying.
