161–170 of 344 posts
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As a horror film fan, I was thinking combustion powered chainsaw.
The lyrebird can imitate a chainsaw -- among many other things. This is from the BBC's Life on Earth. https://www.youtube.com/watch?v=VjE0Kdfos4Y
I'm just glad they identified the source of the hum, many people are impacted for years by unexplainable sounds, and it is maddening. It took me and my neighbours a month to find the source of a hum that was resonating with our windows. It was torture, with midnight walks and lurking around potential sources, mapping nearby industrial sites, and questioning our sanity, while our windows were vibrating without a stop.…
When I lived in Nob Hill, there was a quiet long beeping sound that could be heard every couple of minutes - imagine a quiet booooop and you're pretty much there. Definitely sounded electronic. The weird thing was I could actually hear it on quiet days in a large radius in Nob Hill. It didn't seem to be localized on my house. I was never able to identify it, and searching online gave me nothing.
It’s always the same length, about a second. It’ll come in pulses of 2 or 3 usually. Spread out a few minutes a part. It definitely sounds like an electronic sound. Almost like a sci fi satellite sound but deep in the water far away. Or maybe a far away whale mourning or something.
I just traveled for 3 months and heard it spread across 10 cities.
It’s very weird...
I'm just glad they identified the source of the hum, many people are impacted for years by unexplainable sounds, and it is maddening. It took me and my neighbours a month to find the source of a hum that was resonating with our windows. It was torture, with midnight walks and lurking around potential sources, mapping nearby industrial sites, and questioning our sanity, while our windows were vibrating without a stop.…
Two unrelated anecdotes: 1. A few years ago I spent some time in Falmouth, MA and there was an ongoing battle over newly installed wind turbines. The humming sound was getting to people, including to the point where they were getting headaches. Some people heard it and others didn't. The locals were going to war with the initiative. This article reminded me of that and I checked in on the ordeal. Looks like they shut…
I found my trail journal entry about this: https://www.trailjournals.com/journal/entry/14113
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Use the sails and lift the anchor manually? (I'm guessing, don't have a yacht).
You would have trouble landing without the engine though. Better not to risk it if there's no problem with being anchored there, and just waiting for the fix.
I'm just glad they identified the source of the hum, many people are impacted for years by unexplainable sounds, and it is maddening. It took me and my neighbours a month to find the source of a hum that was resonating with our windows. It was torture, with midnight walks and lurking around potential sources, mapping nearby industrial sites, and questioning our sanity, while our windows were vibrating without a stop.…
Does anyone know if they are planning on removing the slats? Maybe if they randomly changed the spacing of the slats if it would alleviate the problem ?
What's resonating? If the slats themselves are resonating, spacing them differently won't help much. Then again, if it is the slats would a horizontal brace running along the middle of the slats dampen or eliminate the resonance? | | | ------------- | | |
Running a brace might not be a bad idea, but i could imagine that it might just double the octave, and make it a bit quieter
I'm just glad they identified the source of the hum, many people are impacted for years by unexplainable sounds, and it is maddening. It took me and my neighbours a month to find the source of a hum that was resonating with our windows. It was torture, with midnight walks and lurking around potential sources, mapping nearby industrial sites, and questioning our sanity, while our windows were vibrating without a stop.…
I was going insane at my old house because of 'the hum'. It started when I installed double pane windows. I think they dropped the ambient noise to the point where the hum was obvious. Any idea what you'd use to track down very low frequency noise sources(i.e. 15-60Hz)? I don't think a lot of sensors do well in that range.
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Geez, I'm torn on number one, since obviously locals should be able to live in peace, but the world is in such incredibly dire need of clean energy. Surely this was an issue with these specific turbines, right? Not a problem with all of them?
Low-grade humming is exhausting anyway. That's one of the reasons people are so tired after a long plane flight, despite just sitting there. Giant stationary installations with very loud noises tend to cause weird noise issues. It's a lot of unfocused, or weirdly focused sonic energy that can't be heard from a little further away, but at exactly the right (well, wrong) place, it can get re-focused, leading to a droni…
Noise studies by qualified acoustical engineers are the rule not the exception in many jurisdictions.[1] But these only go so far, because the model of the predicted noise emissions from the as-yet-unbuilt turbine is only so detailed.
For what it's worth, no matter how much engineering you do there are always people who think they can hear something that can't be measured and won't be convinced otherwise.
On the other hand, a thing that really does reduce complaints is paying a community dividend to everyone who lives nearby (instead of just paying the owners of the actual land under the turbines).
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I don't think SF residents are as thrilled. It's overwhelmingly loud.
I imagine it’s just going to be ignored. Like the bart “screeching” they never fixed.
https://sf.curbed.com/2018/6/11/17449460/bart-screen-convers...
My understanding was that all rail systems since roughly forever use tapered wheels. Primarily to reduce wear, by having the tapered wheels self center instead of grinding against the track.
It's really odd that they seem to just roll that out in 2017?