Rank: Forum user 
|
Any one know much about acoustics?
Currently looking to build an enclosure to house a vibrating table and a LEV filter system.
Just looking for acoustic engineering companies at the moment so I can review what services they provide.
Thanks.
|
|
|
|
|
|
Rank: Super forum user
|
Mark
Top of the range e.g. INVC at Slough.
But, depending on dB(A) and the attenuation you need, you probably don't need anything hi tech, and you probably don't need to be exact in guessing how much attenuation you will achieve in advance of simple, cheap construction.
Bottom of the range. Breeze block enclosure, wooden door, possibly with some insulating material. If you need vision panels polycarbonate, possibly double glazed with substantial gap between two layers of glazing.
Almost bottom of the range. Wood panel walls, lined with cardboard egg boxes, covered with aluminium foil. Noise passes through foil, partly absorbed by cardboard, less energy, noise no longer passes through foil but is reflected back to cardboard.
Slightly more sophisticated and better from a fire risk point of view, replace egg boxes with mineral wool.
Next, simple acoustic sandwich panels as used in building construction.
Any large openings e.g. if you need to be a fork truck through - overlapping rubber or plastic strips across opening. Locate opening to face away from workforce.
Might not even need a roof unless issue with noise reflected from roof of building above.
|
|
|
|
|
|
Rank: Super forum user 
|
No expert.
We did put a soundproof enclosure around a factory process, and it worked very well. What we failed to take into account was how hot it would get inside. The enclosure was quite big 10m x 4m, and people had to go inside for maintenance etc.
I note that you mention LEV so you may not have the same issue, but I thought I would just highlight it.
Chris
|
|
|
|
|
|
Rank: Super forum user
|
Mark - During my time with HSE I saw various noise control enclosures either around noisy machines or around one or more employees at control panels for large noisy machines which were inherently difficult or impracticable to enclose, e.g. sawmill machinery for processing tree trunks. Another advantage of employee enclosures was that heating could be installed in them for the benefit of employees working at premises such as open-sided sawmills which were impracticable to heat.
Though some of the enclosures I saw could be described as expensive proprietary ones most tended to be within the lower range of construction outlined above by peter gotch, constructed either as self-design & build entities or by non-specialist tradesmen. Even so, they generally seemed effective at doing what they were intended to do. Therefore, for the situation you describe, it might be appropriate to try a simple self-build enclosure. If it provides sufficient noise control, your company will have achieved what is needed for relatively little cost. If it doesn't quite do the job, try considering what modifications which render it effective.
|
|
|
|
|
|
Rank: Forum user
|
As Peter stated I too can vouch for INVC.
My first port of call would be to do what I could at source, i.e. see if the bowl is fitted with dampers on the feet (had a similar piece of kit at a previous place) and found it bolted directly to a machine frame which ended up transferring vibration throughout the whole machine and thereby generating noise from any large panels or loose objects. you can also get the insides painted with a rubberised paint which can help reduce the noise from metal parts contacting any metal surface (but this wont help reducing the noise from parts being vibrated contacting each other).
Now with regards to enclosures themselves; if you have the means to do some octave band analysis of the noise in house and it is in the higher frequency ranges; then some simple acoustic foam on the internal surfaces of any enclosure you fabricate in house could offer you some significant reduction in noise (providing of course that the enclosure is that i.e. an actual enclosure; because the more (or any opening if large) openings you have, then obviously the greater the level of noise that will escape.
You can also get fire retardant foam, so this would be good if close to a potential source of ignition; or to ensure that additional (potentially noxious) smoke would not be generated in a fire situation.
|
|
|
|
|
|
Rank: Forum user
|
Peter, Chris, Graham Smitch, thank you all for taking the time to reply, given me plenty of food for thought.
I have an external company to build the general enclosure - with sound proofing built in, have some analysis of the vibrating table happening Thursday so hopefully will have some data to go on soon.
Thank you all again for your reply, will let you know how it goes - Production think it will all be finished in October - I think December at the earliest.
|
|
|
|
|
|
Rank: Forum user
|
In the past i've used Nederman who do both acoustic walling & LEV.
|
|
|
|
|
|
You cannot post new topics in this forum.
You cannot reply to topics in this forum.
You cannot delete your posts in this forum.
You cannot edit your posts in this forum.
You cannot create polls in this forum.
You cannot vote in polls in this forum.