Working
Group 1.63
Room
Acoustics
Round
Robin
In
construction planning architects make to an ever increasing extent use
of the computer to predict the acoustic qualities of a room, for
instance of a concert hall. No software has however so far been in a
position to replace a qualified and experienced acoustician. For
developers and users of computer simulation software it is therefore of
great interest to learn the differences of their results to those being
measured on the same object.
That
was the reason why the PTB as an independent and neutral institution
started in 1994 the first international "round
robin 1" with 16 participants from 7 countries. The object of
examination was the auditorium of the PTB at its then condition
and the parameters T30,
EDT, D50, C80
TS, G, LF and LFC had to be calculated in the 1 kHz octave band. The
results showed such strong discrepancies between the different
participants that a safe prediction of the room acoustical parameters
for this room seemed to be impossible.
In
1996-98 the PTB organized another international "round robin 2" with 16
participants from 9 different countries and use of 13 different
computer programs. This time the object under examination was a concert
hall in Jönköping/Sweden named ELMIA-hall. The
results of this round robin had been much better than those of Round
Robin 1 but the complex design of this hall generated many troubles.
That's
why in 1999 the PTB decided in agreement with most of the leading room
acousticians in the TC of the EAA to start another "round robin 3" with a
relatively simple structured room. This is the PTB studio which was
intended to be examined in 3 phases. In phase 1 the studio had only
plain walls, ceiling and floor with uniform absorption data, in phase 2
the real absorption coefficients were added without changing the simple
geometry and in phase 3 all design details and geometrical data had to
be regarded. This round robin is finished.
Those
colleagues who decided not to participate in round robin 3 but who
would like to make the same calculation for their own in a private study can get all
needed information here.
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