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Strange reverberation time results
PostPosted: Thu Jul 15, 2021 11:00 am Reply with quote
Bartek Zdeb
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Joined: 16 May 2011
Posts: 9
Location: Poland




Hi everyone,
I design the acoustic adaptation of the existing multi-functional hall. First, in the model, I optimized the calculation parameters so that they did not affect the results in Aura v.4 (number of particles = high, length = long, scattering = auto S-curve 10% -40%, 2 sources, 5 receivers). I needed a shorter RT reverberation time at 250 Hz, so I used a material with an absorption coefficient higher by 0.50 for this frequency, area share ~ 23%. After the calculations, I was very surprised as the calculated RT was the same or higher at 250 Hz instead of lower (the RT in Optimize RT at 250 Hz is 0.12 sececond shorter). I tried several times, the results were similar. In the remaining frequencies, the RT behaved predictably. How can this be explained? Have you had such experiences?

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bartek
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PostPosted: Thu Jul 15, 2021 1:46 pm Reply with quote
Agustín Arias
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Joined: 10 Apr 2013
Posts: 42
Location: Caseros, Buenos Aires, Argentina




Hi bartek
It will be difficult to give you an adequate answer without exploring your model. But, first of all, did you check the statistical reverberation time (Sabine/Eyring)? Did you see the same effect at 250 Hz?

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Eng. Agustín Arias
Ottobre & Ottobre, Acoustical Consultants
Buenos Aires, Argentina
agustin.arias@outlook.com
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PostPosted: Thu Jul 15, 2021 2:01 pm Reply with quote
Bartek Zdeb
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Joined: 16 May 2011
Posts: 9
Location: Poland




Hi Agustin,
The answer is in my post. The difference of 0.12 seconds is 30% of the statistical reverberation time.

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bartek
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PostPosted: Wed Jul 21, 2021 2:51 pm Reply with quote
Agustín Arias
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Joined: 10 Apr 2013
Posts: 42
Location: Caseros, Buenos Aires, Argentina




Hi bartek,
In that case, it will be very difficult (at least for me) to give you an adequate answer without inspecting the model...

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Eng. Agustín Arias
Ottobre & Ottobre, Acoustical Consultants
Buenos Aires, Argentina
agustin.arias@outlook.com
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Strange reverberation time results
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