When Sound Dead Steel designed an enclosure for an engine test facility where engines up to 1,000 horse power are dyno tested, the problem was extremely challenging. Prior to the SDS installation conversation in the entire factory and offices was impossible, neighboring factories were complaining about the noise and had even bought their own noise meters to monitor the noise from this location.
An extraction system was included to ventilate the enclosure to remove fumes and heat from the test bed.
A point to bear in mind is that every decibel reduction represents a 27% reduction in the power level, 3 decibels = 50% reduction, 10 decibels = 1000% reduction.
A video of this enclosure is on the company's web site, or can be emailed direct if requested.
The first part of the clip shows a motor on full revs without any enclosure in place, the reading peaked at 110dB(A), it then shows the enclosure in place with the doors open which gives a reading of 99dB(A), as the doors close the reading drops to 79dB(A).
This reduction represents more than 99% of the original power level.
The next section shows the motor on tick over, with the doors open the noise is 94dB(A) reducing to 69dB(A) with them closed.
Again this is a power reduction in excess of 99%.
The enclosure reduces noise so well SDS were pleased to have speech in the background as the doors shut, it gives continuity and confirms the noise reduction shown on the meter.
A video of this application is shown in the video clips http://www.sounddeadsteel.com/videos.asp
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