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The model of the porous materials in impedance tube
Posted Nov 19, 2015, 10:28 p.m. EST Acoustics & Vibrations Version 4.4 0 Replies
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I am a new one to learn the Comsol. I tried to make the model of the porous materials in impedance tube . But the results of the sound absorption coefficient are always incorrect. I donot know how to deal with the problems.
The errors:
- Variable: comp1.p
- Global scope:
Failed to evaluate variable.
- Variable: comp1.pr
- Defined as: (comp1.p-p0)
Failed to evaluate variable.
- Variable: comp1.p2
- Defined as: ((p0*exp(((j*comp1.k0)*(L-x2))))+(comp1.pr*exp(((L-x2)*(comp1.k0*(-j))))))
Failed to evaluate variable.
- Variable: comp1.r
- Defined as: (((comp1.p2-(comp1.p1*comp1.Hi))*exp((((2*j)*comp1.k0)*(L-x1))))/((comp1.p1*comp1.Hr)-comp1.p2))
Failed to evaluate expression.
- Expression: abs(comp1.r)
Failed to evaluate variable.
- Variable: comp1.alpha
- Defined as: (1-(abs(comp1.r)^2))
Failed to evaluate expression.
- Expression: comp1.alpha
- Plot: glob1 (Global)
Hello Yu Sun
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