noise generator 2

[aerospace2013]

Hello everyone

I'm in the process of studying the effect of noise on some human health aspects. How can I generate the noise in the first place? Do they sell noise/sound generators up to 130 decibel ... Please advise me

Thank you

 

[rb1957]

a loud speaker ? a rotating piece of equipment ? (a wife ?)

have you tried google ? lots of hits for sound meters, but some for equipment to generate noise at particularly frequencies, including something I didn't need to know "brown note".

another day in paradise, or is paradise one day closer ?

 

[aerospace2013]

Thank you sir...
I tried google, ebay, amazon and other resources... but there are several issues
1. they give the measurement in HZ not decibel.. I'm afraid it won't give the right decibel I'm looking for
2. I found decibel measurement devices.. this is not what I'm asking for.. I want something to generate steady noise continuously for days because this is a research on animal model that represent real people
3. they give the option of a radio

Thank you

 

[WKTaylor]

There are several FAA and DoD studies on noise, noise fatigue, tolerance etc for aircrews.

Also... these may provide insight...

AC 20-133 Cockpit Noise and Speech Interference Between Crewmembers

http://www.airweb.faa.gov/Regulator...EF8F143BCB65F0AC862569C3006C17D6?OpenDocument

AC 91-35 Noise, Hearing Damage, and Fatigue in General Aviation Pilots

http://www.airweb.faa.gov/Regulator...930910A91E5D1AD9862569E700746437?OpenDocument

FAA Human Factors Division -

http://www.hf.faa.gov/

This is the 'front-end' to the FAA's human factors Div... may lead to lots of rabbit holes for your research.

also...

WSU NIAR Human Factors -

http://www.niar.wichita.edu/researchlabs/hf_overview.asp

Regards, Wil Taylor

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[IRstuff]

"1. they give the measurement in HZ not decibel.. I'm afraid it won't give the right decibel I'm looking for "

You seem to be a bit confused; dB is the sound intensity, while Hz is the frequency. The "right decibel" doesn't mean anything unless you know the frequency content. I suggest you look at something like this:

http://www.wavtones.com/functiongenerator.php

and then figure out how to get the intensity that you need, which would adding be an amplifier

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert!

https://www.youtube.com/watch?v=BKorP55Aqvg

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[aerospace2013]

Thank you all.

Mr IRstuff. I know that decibel is the sound intensity and Hz is the frequency. But I think there should be a relation between them right?

when I google sound generator or noise generator and I read the description of the suggested device .. the provide info including frequency in Hz and some other technical parameters about the device.. now, my point is how can I know the associated decibel to this frequency (if there is a relation).. or how can I know the range of decibels that this device can give .. because I'm looking for some device (whatever they call it sound or noise generator) to give me range of decibels from around 20-120

Appreciate your feedback.

 

[IRstuff]

" But I think there should be a relation between them right?"

No, there isn't. a 100-Hz sound can have any intensity you want or can make. If you can't grasp this concept, then you're probably not in a good place to do this problem.

TTFN (ta ta for now)
I can do absolutely anything. I'm an expert!

https://www.youtube.com/watch?v=BKorP55Aqvg

faq731-376 forum1529

 

[rb1957]

I think you have a signal (noise) with a frequency and a power level ... how much sound power you're creating at such and such a frequency.

I googled "acoustic noise generator" ... one hit was "ANG 2200" from research-electronics.com. I think you need a noise generator with a tuneable frequency and waveform.

another day in paradise, or is paradise one day closer ?

 

[GregLocock]

You need three things, a waveform generator, an amplifier and a sound source. Sound sources are usually loudspeakers, but not always. Sometimes these are all in one box such as the B&K 4224.

Cheers

Greg Locock


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[aerospace2013]

Mr GregLocock and rb1957 thank you very much for your help ... your info really made a big difference

Mr IRstuff .. thank you.. people keep learning until the last day in their life.. there is nothing called impossible .. such forums are created to help each other or at least to put our feet on the right track to do something that we never thought we could do... with guidance and advice from the experts in their fields everything is possible

Thank you

 

[KENAT]

Aerospace2013, you don't appear to have the necessary experience or knowledge to successfully (or safely) do this task, suggest you do a lot more research and learning before trying.

130 db is plenty loud enough to have negative health impacts depending on circumstances, please do some more digging before giving anyone hearing loss.

For low frequency vibration, if you care, you may need a slightly different solution. If looking to do it on the cheap there are solution for computer gaming that may work.

In addition to the components Greg mentions (and allowing for the fact you may find speakers with amps built in etc.) you will also need a sound meter to measure the produced noise.

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[aerospace2013]

Mr KENAT,

Thank you for your post. I'm pretty aware of the health circumstances associated with 80 decibels and above..don't worry about that at all.

This is not "at home trial" .. this is a research that will be conducted at a university with all the safety precautions taken into consideration.

I'm doing my literature review on these tests these days, but I'm only troubled with the instrument from which I will generate the noise.. because my I'm not an instrumentation specialist .. I'm a material science specialist, I have a medical doctor who is involved in the project as well

Appreciate your help