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Posted By Frank Johnson
Does anyone have formulae and worked examples or a simple programme, perhaps in MS Access, for noise exposure calculations.
I am carrying out a survey of sound emitted during the testing (for a duration of approximately 180 seconds) of a fire warning system to confirm this does not exceed the first action level or peak action levels whilst at the same time achieving a minimum of 65dB(A) required by BS5839. I will be using a BS5969, type 2 meter with slow response and A weighting. I am particularly interested in confirming by calculation the daily noise exposure LEP,d in DdB(A) from the 'Guidance on Noise at Work Regulations 1989 L108 nomogram on page 38in Figure 3. I also want to take into account a calculation for the contribution of background noise, which I will measure separately.
Thank you for your help in anticipation.
Contact: frankjohnson@ukonline.co.uk
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Posted By Raymond Rapp
Hi Frank,
It's been a while since I did a project on noise and the NAW Regs 1989, but from what I can remember a noise level at 180 secs duration would not be anywhere near the first action level, assuming of course we are not talking Concorde levels. Unless of course it it continously repeated.
Other than the Regs you have and the standard nomograms examples I cannot help. But you may like to try an audio institution, I am sure they would help.
Ray
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Posted By Robert K Lewis
Frank
I think you mean Excel not Access as the latter is a database.
If you wish I can provide an Excel spreadsheet for vibration as a model for approaching this problem. The calculations you require are in the acop.
Bob
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Posted By Laurie
I had a similar problem a few years ago. I found that with an industry standard sounder, in a bare stairwell with no absorbent materials, a person would need to stand directly under a sounder for fifteen minutes
to reach a harmful exposure dose.
Incidentally, if you haven't already checked you will be surprised at how quiet 65 dB sounds!
Laurie
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