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  1. SylvestreW

    Help with sound problem

    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...
  2. SylvestreW

    Acoustics training seminars in North America

    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.
  3. SylvestreW

    Advise required for Sound Meter Use

    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...
  4. SylvestreW

    Accelerometer for leak detection

    fwiw, they seem to do what you are suggesting. http://www.echologics.com/
  5. SylvestreW

    Forcing Frequency Limit

    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...
  6. SylvestreW

    noise problem

    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. - Syl. www.aercoustics.com
  7. SylvestreW

    Noise Measurement of Vacuum Pump

    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). - Syl. www.aercoustics.com
  8. SylvestreW

    How do you store and organize accelerometer cables?

    Oh man, don't get started. The smaller ones aren't too bad but we have a few 100' BNC cables that are a real pain. - Syl. www.aercoustics.com
  9. SylvestreW

    Noise Rating Curves

    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...
  10. SylvestreW

    Noise Rating Curves

    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. - Syl.
  11. SylvestreW

    Conferences on Acoutics topic

    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. - Syl.
  12. SylvestreW

    Vibration Isolation - Air Cooled Chiller

    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...
  13. SylvestreW

    Noise abatement for standby generator

    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...
  14. SylvestreW

    Does anyone know of a cheap system?

    Also define what you are measuring? What's your freq. range. Do you need multiple channels? What's your sensitivity? - Aercoustics.com
  15. SylvestreW

    Theoretical sound propagation from a 2D source (wall)

    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...
  16. SylvestreW

    mm/s vibration

    perhaps because you said "zero to peak" as opposed to "zed to peak" :) - Aercoustics.com
  17. SylvestreW

    mm/s vibration

    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. - Aercoustics.com
  18. SylvestreW

    Sound file of bad bearing?

    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.
  19. SylvestreW

    LF: Data on relation between vibration level and audible level

    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.
  20. SylvestreW

    LF: Data on relation between vibration level and audible level

    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.

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