Mechanical Noise
Mechanical Noise
(OP)
In searching for information and ways to reduce noise and vibration from mechanical and process equipment I came across the following site.
www.soundintensity.com
Is anyone else here familiar with the use of sound intensity measurements and how the may benefit a manufacturing / process operation?
I have found little other information about this application.
Dave
www.soundintensity.com
Is anyone else here familiar with the use of sound intensity measurements and how the may benefit a manufacturing / process operation?
I have found little other information about this application.
Dave





RE: Mechanical Noise
hi Dave ,
Can you tell me more about your system,
i am working on active noise control
Bye
RE: Mechanical Noise
Intensity measurements are more usefull in a laboratory setting. I am a former consultant on industrial noise, and I would suggest either engaging someone in the field or doing some study yourself.
Acoustical Consultants can be found on these web sites:
Institute of Noise Control Engineers http://users.aol.com/inceusa/ince.html
National Council of Acoustical Consultants
http://www.ncac.com
Personal Recommendation:
amarash@cdai.com
Beware of "free" engineering offered by sales reps for acoustical treatment companies. Their fiduciary responsibility is to their respective sales organizations, not to you. They may recommend what their quota needs, not what is best for your situation.
Most industrial applications require a mix of remedial actions, the most common being addition of absorptive acoustical treatments to the work space and some type of enclosure for the problem equipment.
Suggested reading:
Noise and Vibration Control, Beranek
Shock and Vibration Handbook, Harris
Sound Analysis and Noise Control, Foreman
Sound, Noise and Vibration Control, Yerges
I hope this information is helpful.
PLS
RE: Mechanical Noise
What is exactly the problem you are facing ?
Sound intensity is helpful in noisy environment to quantify and localize sources.
You can send info to : thomas.antoine@metravib.fr
www.metravib.fr
RE: Mechanical Noise
You could also measure a component in an assembly for a maximum level as a quality test. However as suggested by the other posts, sound intensity requires considerable knowledge to be applied correctly.
RE: Mechanical Noise
This sounds like the answer to a maiden's prayer (or indeed, a naive acoustics engineer's prayer!). As others have intimated, it is much more complex than that and is rather tricky to use in many practical situations. I work in the automotive field so my experience is with engines. If we need to identify which part of an engine is radiating a particular frequency we use a SINGLE microphone, an impact hammer, and accelerometer, and some common sense.
Some engine manufacturers use estimates of panel surface velocity to generate overall sound power levels, and individual contributions, but these are always cross-checked back to the standard method of determining the overall sound power level, which uses 4-7 microphones in an array around the engine, and then back calculate the sound power level from the sound pressure levels. The SAE has a standard describing this.
Intensity has its uses, but it is not usually the primary approach.
Cheers
Greg Locock
RE: Mechanical Noise
Thanks for the quick feedback and information (and reading resources!) It seems to be a highly specialised and limited application, as does "active noise control" from what I have seen, albeit I only have a "laymans" opinion.
No worries here, I just wanted to make sure I wasn't missing out on something I should know more about. No such thing as a "quick fix!"
Dave
RE: Mechanical Noise
http://personal.cityu.edu.hk/~bsapplec/sound2.htm