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Sherlock Ohms

Simulation Identified & Solved Factory Noise Problem

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Mr. Wirtel
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Gold
Re: Either way
Mr. Wirtel   5/31/2014 8:59:34 PM
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@TJ: I am curious as to which came first; the factories or the residential. I worked at a factory that was in the same location for 75 years when we started receiving complaints about the noise some of our punch presses produced. A developer built several apartment houses about 2 blocks from the factory. During the warmer months when we had the windows and doors open the residents would raise cane when the sun went down and the noise did not. We had several machines which we could not use during those hours resulting in lost production. I guess the renters never noticed the factory they drove past before they signed their leases. What was really ironic is that a few of the residents worked in the factory.

TJ McDermott
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Blogger
Either way
TJ McDermott   5/8/2014 2:06:37 AM
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Testing or simulation - either way, it's obvious something had to be done.  Using Google Maps, one can see in Vassa several industrial buildings identified by the Wärtsilä name.  RIGHT across the street from each are residental homes.  

William K.
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Platinum
Re: The testing would not have been that much, really.
William K.   5/5/2014 3:31:19 PM
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The simulation gave them useful information because they used an adequate model that was close enough to correct. Plus, they understood how to read the results to get a useful answer.

Cabe Atwell
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Blogger
Re: The testing would not have been that much, really.
Cabe Atwell   4/30/2014 6:05:47 PM
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Yet another instance where simulation proves to be an invaluable tool to have. 

William K.
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Platinum
Re: The testing would not have been that much, really.
William K.   4/28/2014 8:13:22 PM
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C54, the same examination of the mechanical system should also include a fairly simple mathmatical examination of the potential resonant frequencies of anything resembling a column. Simulation could be useful if the model used were adequate, but I suspect that the creation of an adequate, accurate, model would be more effort that a mathmatic investigation. 

Caspar54
User Rank
Iron
Re: The testing would not have been that much, really.
Caspar54   4/28/2014 2:58:54 AM
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If the resonance sound is caused by mechanical parts you are right, if it is the air /exaust gas resonance ( organ pipe ) more difficult, I Would then surely advise the simulation of the whole system to tune it.  Some systems are designed with  split-systems where the main (low) frequency exit of one is tuned opposite phase  to the other exit, which gives a huge sound reduction, especially for fixed RPM systems ( pumps/ generators) .

William K.
User Rank
Platinum
The testing would not have been that much, really.
William K.   4/25/2014 8:18:43 PM
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To gather the test data needed to do the calculations would not have been that much. One or two RPM sweeps recording the actual noise signal, RPM, and noise amplitude would have been enough. Finding the frequency and RPM associated with the loudest peak would allow the determination of the harmonic relationship to the exhaust frequncy, and then a study of the mechanical structure to find anything that would be resonant at that frequency. Then create a fix and one more run to verify it. Model;ing is indeed another way to do it, but a bit of insight is often a bigger labor saver.

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