AFMG Network Forum

opacheco · Member

Hi again,

I have a dude about the how we can tread an auditorium or main saloon with a access window or door open all the time (no door nor windows at all); How we can to simulate this gap or hole in Ease ??.....I could think this depend if the two rooms are acoustically coupled or not but I am would like to get some advises....I am not sure!

Thanks a lot anticipated,

Opacheco.

opacheco · Member

Any comment?

Opacheco.

Agustín Arias · Member

HI Opacheco,
Can you share more info about your hall? Pictures or drawings. It will be very helpful to see the dimensions of the hall and the size of that coupled room. Each case is different, and it always depends of the morphology of the enclosure

opacheco · Member

Augustin,

Thanks a lot for your response.

This is a design project until but I want to know in advance what are these criteria in order to define if we can put a open window for that or consider that like a close window or add some absorption diffusion or wherever coefficients for its simulation inside of the main analyzed space......I am not sure how these spaces are coupled or not and how EASE could consider that if this will be a coupled or not coupled spaces???......I have the Cad drawing but I am unable to send this design drawing for confidentiality restrictions of the customer, sorry!.....I can to bring you the average dimension if you want.

Do you have some procedures for consider that a open window or add a specific absorption coefficient or consider that a close window ??

Thanks a lot,
Opacheco

Waldemar · Member

An open window should be modeled as closed window and the material has to be 100% absorption.
If there are two rooms, connected by an open door, you can model it like it is, no face (material) in the door. EASE is using one room in any case. It can have a small part as connection in the whole room.
Keep in mind, that the calculations depend of the positions of the speakers.
You should use more rays and a longer impulse response.

opacheco · Member

[quote="Waldemar"]An open window should be modeled as closed window and the material has to be 100% absorption.
If there are two rooms, connected by an open door, you can model it like it is, no face (material) in the door. EASE is using one room in any case. It can have a small part as connection in the whole room.
Keep in mind, that the calculations depend of the positions of the speakers.
You should use more rays and a longer impulse response.[/quote]

Waldemar,

Thanks for your advises but the problem here is we only have to design the main room, this simulation consider only the main room and the another adjacent room isn't considered in the project; but we need to take in consideration the interaction with the main room NOT viceversa!!.....the adjacent room won't generate any noise in there (this, for the nature of the activities inside of)

Thanks,
Opacheco.

thomas · Member

Hi,
the influence of the second room on the main room roughly depends on :
- volume and dimensions of each partial room
- size of the opening
- acoustic properties of each partial room.

There are three cases:
- both rooms have to be considered as one room
- both rooms have to be considered as coupled rooms
- each room can be considered alone.

If the rooms are really coupled:
- RT of the second room is shorter than RT of the main room:
simulate the opening as an absorber
(attention: this could depend on frequency)

- RT of the second room is longer than RT of the main room:
simulate the whole enclosure (both rooms).
But keep in mind, simulating this with geometric acoustics is often
only a really rough estimation (accuracy depends on wavelength
and dimensions of the opening).

To decide wether the rooms are coupled or not, see literature, e.g.
Kutruff: Room Acoustics (chapter V and IX in 3rd edition).

Good luck
Thomas

opacheco · Member

[quote="thomas"]Hi,
the influence of the second room on the main room roughly depends on :
- volume and dimensions of each partial room
- size of the opening
- acoustic properties of each partial room.

There are three cases:
- both rooms have to be considered as one room
- both rooms have to be considered as coupled rooms
- each room can be considered alone.

If the rooms are really coupled:
- RT of the second room is shorter than RT of the main room:
simulate the opening as an absorber
(attention: this could depend on frequency)

- RT of the second room is longer than RT of the main room:
simulate the whole enclosure (both rooms).
But keep in mind, simulating this with geometric acoustics is often
only a really rough estimation (accuracy depends on wavelength
and dimensions of the opening).

To decide wether the rooms are coupled or not, see literature, e.g.
Kutruff: Room Acoustics (chapter V and IX in 3rd edition).

Good luck
Thomas[/quote]

Tomas,
Clear response!!....

Thanks
Opacheco