Coefficients for materials to create reflections

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Assigned to anikara...@gmail.com by me

Mojo Go

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Jul 7, 2019, 4:59:20 PM7/7/19
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I am trying to create a reflective surface of sound particles/rays, but I notice there are only direct calculations even with numbers in the material elements for absorption, diffusion, transmission checked, etc. I want ot create a simulation for MDF fiberboard. I know its density and acoustic coefficients for the passband in mind, but I cant get the calculation to recognize the surfaces/boundaries are reflective so that RT reached -60dB respectively for each band. They just disappear once they hit the surface. 

Any suggestions?

UMRAE Official

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Jul 9, 2019, 11:29:14 AM7/9/19
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Thank you for using I-Simpa.
To help you, I need more information.
- What is the 3D model around the MDF fiberboard ?
- Do you set a sound source ?

May be some screenshotd could help us.
Best

Leonardo F.

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Sep 27, 2019, 9:38:35 AM9/27/19
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Hi, i think im in a similar situation. I have some hanging reflectors in the ceiling but im not sure if they are included in the I-simpa calculation.
¿Is there any way to be sure that this surfaces are take in account?

This is the definition for this material:

<?xml version="1.0" encoding="UTF-8"?>
<root>
  <property name="Material description" eid="41" wxid="3070">
    <p name="side_material" eid="23" wxid="3075" label="Side of material effect" ex="1" nb="2" choice="0">
      <enumeration id="0" value="Unilateral"/>
      <enumeration id="1" value="Bilateral"/>
    </p>
    <p name="resistivite" eid="25" wxid="3072" label="Resistivity (cgs)" ex="1" value="100000" pr="4"/>
    <p name="reference" eid="20" wxid="3073" label="Reference" textValue=" Ref 2.238"/>
    <p name="masse_volumique" eid="25" wxid="3071" label="Mass density (kg/m3)" ex="1" value="15" pr="4"/>
    <p name="description" eid="20" wxid="3074" label="Description" textValue=" Algomerado de 8+30mm"/>
  </property>
</root>

<?xml version="1.0" encoding="UTF-8"?>
<root>
  <materiau name="Material spectrum" eid="44" wxid="2907" idmateriau="104">
    <p name="20000" eid="52" wxid="3064" label="20000 Hz">
      <p name="loi" eid="23" wxid="3069" readonly="1" label="Diffusion law" ex="1" nb="7" choice="0">
        <enumeration id="0" value="Specular"/>
        <enumeration id="1" value="Uniform"/>
        <enumeration id="2" value="Lambert"/>
        <enumeration id="3" value="W2"/>
        <enumeration id="4" value="W3"/>
        <enumeration id="5" value="W4"/>
        <enumeration id="6" value="Semi-diffuse"/>
      </p>
      <p name="affaiblissement" eid="25" wxid="3068" readonly="1" label="Loss (dB)" ex="1" value="0" pr="1" minValue="0"/>
      <p name="transmission" eid="26" wxid="3067" label="Transmission" value="0"/>
      <p name="diffusion" eid="25" wxid="3066" label="Diffusion" ex="1" value="0" pr="2" minValue="0" maxValue="1"/>
      <p name="absorb" eid="25" wxid="3065" label="Absorption" ex="1" value="0.04" pr="2" minValue="0" maxValue="1"/>
    </p>
    <p name="16000" eid="52" wxid="3058" label="16000 Hz">
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    </p>
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        <enumeration id="4" value="W3"/>
        <enumeration id="5" value="W4"/>
        <enumeration id="6" value="Semi-diffuse"/>
      </p>
      <p name="affaiblissement" eid="25" wxid="2960" readonly="1" label="Loss (dB)" ex="1" value="0" pr="1" minValue="0"/>
      <p name="transmission" eid="26" wxid="2959" label="Transmission" value="0"/>
      <p name="diffusion" eid="25" wxid="2958" label="Diffusion" ex="1" value="0" pr="2" minValue="0" maxValue="1"/>
      <p name="absorb" eid="25" wxid="2957" label="Absorption" ex="1" value="0.25" pr="2" minValue="0" maxValue="1"/>
    </p>
    <p name="250" eid="52" wxid="2950" label="250 Hz">
      <p name="loi" eid="23" wxid="2955" readonly="1" label="Diffusion law" ex="1" nb="7" choice="0">
        <enumeration id="0" value="Specular"/>
        <enumeration id="1" value="Uniform"/>
        <enumeration id="2" value="Lambert"/>
        <enumeration id="3" value="W2"/>
        <enumeration id="4" value="W3"/>
        <enumeration id="5" value="W4"/>
        <enumeration id="6" value="Semi-diffuse"/>
      </p>
      <p name="affaiblissement" eid="25" wxid="2954" readonly="1" label="Loss (dB)" ex="1" value="0" pr="1" minValue="0"/>
      <p name="transmission" eid="26" wxid="2953" label="Transmission" value="0"/>
      <p name="diffusion" eid="25" wxid="2952" label="Diffusion" ex="1" value="0" pr="2" minValue="0" maxValue="1"/>
      <p name="absorb" eid="25" wxid="2951" label="Absorption" ex="1" value="0.25" pr="2" minValue="0" maxValue="1"/>
    </p>
    <p name="200" eid="52" wxid="2944" label="200 Hz">
      <p name="loi" eid="23" wxid="2949" readonly="1" label="Diffusion law" ex="1" nb="7" choice="0">
        <enumeration id="0" value="Specular"/>
        <enumeration id="1" value="Uniform"/>
        <enumeration id="2" value="Lambert"/>
        <enumeration id="3" value="W2"/>
        <enumeration id="4" value="W3"/>
        <enumeration id="5" value="W4"/>
        <enumeration id="6" value="Semi-diffuse"/>
      </p>
      <p name="affaiblissement" eid="25" wxid="2948" readonly="1" label="Loss (dB)" ex="1" value="0" pr="1" minValue="0"/>
      <p name="transmission" eid="26" wxid="2947" label="Transmission" value="0"/>
      <p name="diffusion" eid="25" wxid="2946" label="Diffusion" ex="1" value="0" pr="2" minValue="0" maxValue="1"/>
      <p name="absorb" eid="25" wxid="2945" label="Absorption" ex="1" value="0.25" pr="2" minValue="0" maxValue="1"/>
    </p>
    <p name="160" eid="52" wxid="2938" label="160 Hz">
      <p name="loi" eid="23" wxid="2943" readonly="1" label="Diffusion law" ex="1" nb="7" choice="0">
        <enumeration id="0" value="Specular"/>
        <enumeration id="1" value="Uniform"/>
        <enumeration id="2" value="Lambert"/>
        <enumeration id="3" value="W2"/>
        <enumeration id="4" value="W3"/>
        <enumeration id="5" value="W4"/>
        <enumeration id="6" value="Semi-diffuse"/>
      </p>
      <p name="affaiblissement" eid="25" wxid="2942" readonly="1" label="Loss (dB)" ex="1" value="0" pr="1" minValue="0"/>
      <p name="transmission" eid="26" wxid="2941" label="Transmission" value="0"/>
      <p name="diffusion" eid="25" wxid="2940" label="Diffusion" ex="1" value="0" pr="2" minValue="0" maxValue="1"/>
      <p name="absorb" eid="25" wxid="2939" label="Absorption" ex="1" value="0.4" pr="2" minValue="0" maxValue="1"/>
    </p>
    <p name="125" eid="52" wxid="2932" label="125 Hz">
      <p name="loi" eid="23" wxid="2937" readonly="1" label="Diffusion law" ex="1" nb="7" choice="0">
        <enumeration id="0" value="Specular"/>
        <enumeration id="1" value="Uniform"/>
        <enumeration id="2" value="Lambert"/>
        <enumeration id="3" value="W2"/>
        <enumeration id="4" value="W3"/>
        <enumeration id="5" value="W4"/>
        <enumeration id="6" value="Semi-diffuse"/>
      </p>
      <p name="affaiblissement" eid="25" wxid="2936" readonly="1" label="Loss (dB)" ex="1" value="0" pr="1" minValue="0"/>
      <p name="transmission" eid="26" wxid="2935" label="Transmission" value="0"/>
      <p name="diffusion" eid="25" wxid="2934" label="Diffusion" ex="1" value="0" pr="2" minValue="0" maxValue="1"/>
      <p name="absorb" eid="25" wxid="2933" label="Absorption" ex="1" value="0.4" pr="2" minValue="0" maxValue="1"/>
    </p>
    <p name="100" eid="52" wxid="2926" label="100 Hz">
      <p name="loi" eid="23" wxid="2931" readonly="1" label="Diffusion law" ex="1" nb="7" choice="0">
        <enumeration id="0" value="Specular"/>
        <enumeration id="1" value="Uniform"/>
        <enumeration id="2" value="Lambert"/>
        <enumeration id="3" value="W2"/>
        <enumeration id="4" value="W3"/>
        <enumeration id="5" value="W4"/>
        <enumeration id="6" value="Semi-diffuse"/>
      </p>
      <p name="affaiblissement" eid="25" wxid="2930" readonly="1" label="Loss (dB)" ex="1" value="0" pr="1" minValue="0"/>
      <p name="transmission" eid="26" wxid="2929" label="Transmission" value="0"/>
      <p name="diffusion" eid="25" wxid="2928" label="Diffusion" ex="1" value="0" pr="2" minValue="0" maxValue="1"/>
      <p name="absorb" eid="25" wxid="2927" label="Absorption" ex="1" value="0.4" pr="2" minValue="0" maxValue="1"/>
    </p>
    <p name="80" eid="52" wxid="2920" label="80 Hz">
      <p name="loi" eid="23" wxid="2925" readonly="1" label="Diffusion law" ex="1" nb="7" choice="0">
        <enumeration id="0" value="Specular"/>
        <enumeration id="1" value="Uniform"/>
        <enumeration id="2" value="Lambert"/>
        <enumeration id="3" value="W2"/>
        <enumeration id="4" value="W3"/>
        <enumeration id="5" value="W4"/>
        <enumeration id="6" value="Semi-diffuse"/>
      </p>
      <p name="affaiblissement" eid="25" wxid="2924" readonly="1" label="Loss (dB)" ex="1" value="0" pr="1" minValue="0"/>
      <p name="transmission" eid="26" wxid="2923" label="Transmission" value="0"/>
      <p name="diffusion" eid="25" wxid="2922" label="Diffusion" ex="1" value="0" pr="2" minValue="0" maxValue="1"/>
      <p name="absorb" eid="25" wxid="2921" label="Absorption" ex="1" value="0.4" pr="2" minValue="0" maxValue="1"/>
    </p>
    <p name="63" eid="52" wxid="2914" label="63 Hz">
      <p name="loi" eid="23" wxid="2919" readonly="1" label="Diffusion law" ex="1" nb="7" choice="0">
        <enumeration id="0" value="Specular"/>
        <enumeration id="1" value="Uniform"/>
        <enumeration id="2" value="Lambert"/>
        <enumeration id="3" value="W2"/>
        <enumeration id="4" value="W3"/>
        <enumeration id="5" value="W4"/>
        <enumeration id="6" value="Semi-diffuse"/>
      </p>
      <p name="affaiblissement" eid="25" wxid="2918" readonly="1" label="Loss (dB)" ex="1" value="0" pr="1" minValue="0"/>
      <p name="transmission" eid="26" wxid="2917" label="Transmission" value="0"/>
      <p name="diffusion" eid="25" wxid="2916" label="Diffusion" ex="1" value="0" pr="2" minValue="0" maxValue="1"/>
      <p name="absorb" eid="25" wxid="2915" label="Absorption" ex="1" value="0.4" pr="2" minValue="0" maxValue="1"/>
    </p>
    <p name="50" eid="52" wxid="2908" label="50 Hz">
      <p name="loi" eid="23" wxid="2913" readonly="1" label="Diffusion law" ex="1" nb="7" choice="0">
        <enumeration id="0" value="Specular"/>
        <enumeration id="1" value="Uniform"/>
        <enumeration id="2" value="Lambert"/>
        <enumeration id="3" value="W2"/>
        <enumeration id="4" value="W3"/>
        <enumeration id="5" value="W4"/>
        <enumeration id="6" value="Semi-diffuse"/>
      </p>
      <p name="affaiblissement" eid="25" wxid="2912" readonly="1" label="Loss (dB)" ex="1" value="0" pr="1" minValue="0"/>
      <p name="transmission" eid="26" wxid="2911" label="Transmission" value="0"/>
      <p name="diffusion" eid="25" wxid="2910" label="Diffusion" ex="1" value="0" pr="2" minValue="0" maxValue="1"/>
      <p name="absorb" eid="25" wxid="2909" label="Absorption" ex="1" value="0.4" pr="2" minValue="0" maxValue="1"/>
    </p>
  </materiau>
</root>

thanks for your time.
Leonardo
captura de pantalla.jpg

Nicolas Nico

unread,
Sep 27, 2019, 10:25:29 AM9/27/19
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You can display the 3d model using the material color:


Leonardo F.

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Sep 27, 2019, 10:48:42 AM9/27/19
to I-Simpa User Forum
Thanks for your answer Nico,
I see the reflectors.
In this case is better to use Bilateral configuration?
And the mass  of the material is used in the calculation?
thanks
Leonardo
captura de pantalla2.jpg

Nicolas Nico

unread,
Sep 30, 2019, 3:06:00 AM9/30/19
to I-Simpa User Forum
Bilateral materials are for walls without thickness.

When you use the remeshing tool, you cannot make a transmission, so it doesn't matter.

What do you call "mass  of the material" ?
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