The description isn't entirely clear to me but if the two rooms are adjacent, and share the same floor, then almost all the energy is likely from the floor.
I did a project a while back with a similar setup. Gym in condo on ground floor and 2 bays over were guest suites. Testing was showing...
Bruel & Kjaer used to offer courses. You'll have to check their website to see what's available.
Also, via either ASA or INCE, you'll find many of the universities offer one-off courses. I know Penn definitely has these courses available.
I'm not familiar with the UK (as I'm based in Canada) but, here, there are a lot of companies who do this at very reasonable prices (sub-$1000).
I have to imagine that seeing if there are companies that do this will be more cost effective that trying to buy a meter, learn to use it and...
You are asking about a few differen things.
First, you need to know the natural frequency of the system. Then, to avoid a problem, the forcing frequency should be at least 3 times less than the natural frequency.
If the forcing frequency is too close to the natural frequency, you can get a...
Marcin,
Are the motors outside the building (on the roof) or inside? Is there a stack for the exhaust air?
If you could provide some pictures then you'll definitely get more assistance.
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Syl.
www.aercoustics.com
Well, the cheapest method would be to record a *.Wav file and then analyze it on the computer (assuming you have software capable of that - audacity comes to mind).
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Syl.
www.aercoustics.com
hyd,
I'd steer clear from trying to document and use a relationship between dBA & NC (or NR). Quite honestly, they are meant for different things, and it's possible that by stating one, you'll miss something.
You are correct that by summing the maximum NC levels you'll end up with a dBA value...
Noise Criteria (NC) is common in the US.
Noise Rating (NR) is common in Europe.
For NR curves, see http://www.engineeringtoolbox.com/nr-noise-rating-d_60.html
Their relation will depend on the spectrum shape.
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Syl.
In the US, there's the acoustic society of america (ASA) and the institute of noise control engineering of the USA (INCE).
Both have calenders on their website which list upcoming events etc.
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Syl.
I'd recommend hiring a proper noise & vibration company. Msg. me if you would like recommendations in the GTA area.
To answer your question:
Saying "put springs and a pad" is strictly accurate, but there's a good bit more than that that goes into proper isolation. You do need to control the...
So, the constraints are
1) 60 dBA @ fence line
2) Can't move nor modify generator
3) Can't spend much
You say it's normally 74 dBA @ 7m so at fence line it's around 78 dBA. You then need ~17dB reduction in the form of an enclosure w/ silencers etc. There's air flow (both for engine and heat...
A couple comments
What's the source inside the housing and what's the wall? The reason I ask is why do you believe the wall is vibrating? Unless it's closely coupled with the source, there's no reason to believe the panel is generating the noise. Far more likely is that the noise is being...
Vibration can be measured in terms of displacement, velocity and acceleration of the object.
What you are measuring is the velocity of the object/structure/whatever (due to the applied forces) in millimeters per second.
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Aercoustics.com
Was just curious, does anyone have a sound file (mp3, wav, etc) of the sound of a bad bearing compared to a good bearing?
I don't work in that field but always hear about this so I'm curious to actually hear the difference myself.
TIA.
If your question was "how much 125Hz..." then sorry, I don't have that information.
Subjectively, I'd say it would be drowned out by background if I were to measured outside the house. Once outside, you can't hear the machine whatsoever.
Third party may be an option but not likely money will be spent.
The issue is: is the vibration of the floor causing the vibrations or is it the drywall acting like a loudspeaker. I plan on fixing the vibrations but wondering if reducing the vibrations enough will drop the noise.
