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To coat or not to coat?
PostPosted: Thu Feb 28, 2008 6:27 pm Reply with quote
Don DeLong
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Joined: 02 Mar 2006
Posts: 5
Location: Peoria, IL




I was told by a colleague awhile back that coating a face on another face (eg acoustic panels on an existing wall) will cause inaccurate results, as the back surface of the coated face would still be seen by Aura and raytracing as an absorber. Does anyone know if this is accurate, or if this was an issue in an earlier version of EASE?

This seems counter intuitive to me, but since hearing this I have built-in faces rather than coating them whenever necessary. It sure is a lot of extra work if it is unnecessary. I will try building the same model both ways and see if there are noticable differences.

Thanks,
Don
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PostPosted: Thu Feb 28, 2008 7:04 pm Reply with quote
Jim Mobley
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Joined: 27 Jul 2005
Posts: 134
Location: Foothill Ranch, California, USA




Hi Don,

From the EASE FAQ on our website:

http://www.renkus-heinz.com/support/software-support/ease_support/faq/faq.html#twofoldfaces

Two-fold, or two sided, faces can be used two ways in EASE. The first way is when acoustic energy will strike both sides of a face. Examples would be partial height room partitions, “flown” acoustic panels or a solid balcony rail that has been modeled simply (as a single, two sided face). In this situation you would select “two-fold face” in the Properties dialog box and assign the proper wall material to each side of the face.

The second way is when you wish to “coat” (paste) one material on top of another material. An example in the Tutorial is windows in a wall, but the same principal applies to doors, acoustic panels, seating areas or any situation where an area of one acoustic material is surrounded by an area of some other acoustic material.

In this case one face is the “coating” face and one is the “coated” face. For example in the case of a seating area on a larger floor area, the seating area would be the coating face and the floor would be the coated face. The coating face must have its properties set to two-fold and the “Coat Of” box checked and the face number of the floor selected in the selection box. When all this is done EASE will then subtract the covered area of the coated face, in this case the floor, and the area of the rear of the coating face, in this case the seating area from the total area of the room when it makes the RT60 calculations. You can see this in the Room Data window where the difference between the “Effective Surface Area” and the “Total Surface Area” reflects the subtraction.

Material selection for the rear face of a two-fold face is important when both sides will be exposed acoustically. If the two-fold face is a coating face the area of the rear face is subtracted and thus the selection of the material is not important. Generally it is left the same as the front material.

Don’t forget to check the properties of any faces you create after creating a two-fold face as EASE will “remember” and leave the two-fold property box checked for subsequent faces. This will cause a hole if a two-fold face is used on an outside wall.

_________________
Best regards,

Jim Mobley
Sr. Application Engineer
Renkus-Heinz, Inc.
19201 Cook St.
Foothill Ranch, CA 92610 USA
TEL: +1-949-588-9997
FAX: +1-949-588-9514
www.renkus-heinz.com
mailto:jim@renkus-heinz.com
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PostPosted: Fri Feb 29, 2008 4:35 pm Reply with quote
Don DeLong
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Joined: 02 Mar 2006
Posts: 5
Location: Peoria, IL




Thanks Jim, this is exactly how I would expect it to work.
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