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Old Today, 12:51 PM   #8901
mabat is offline mabat  Czech Republic
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Quote:
Originally Posted by aragorus View Post
... higher up in frequency where the air wouldn't be just moving back and forward with the source.
That's not what happens - at high frequencies the acoustic load becomes more and more purely resistive, i.e. the energy radiated as sound is high. The "mass" part of the loading doesn't produce sound in a form of propagating waves - it only moves back and forth with (close to?) the source. Well at least that's my rather poor understanding. It's never a pure mass loading though, there's always some radiation as well.
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Old Today, 01:32 PM   #8902
David McBean is offline David McBean  Australia
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A volume of air accelerated without compression - acoustic mass.
A volume of air compressed without acceleration - acoustic compliance.
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Old Today, 01:40 PM   #8903
mabat is offline mabat  Czech Republic
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Why there's no mass loading in the plane wave tube? What does it take to make "acoustic mass"?
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Old Today, 02:07 PM   #8904
TNT is offline TNT  Sweden
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Can something be compressed without an acceleration?

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Old Today, 02:13 PM   #8905
mabat is offline mabat  Czech Republic
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I may be wrong but I read it as "without moving the center of mass", which can be done.
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Old Today, 02:14 PM   #8906
David McBean is offline David McBean  Australia
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Originally Posted by mabat View Post
What does it take to make "acoustic mass"?
A rigid tube open at both ends, short enough (less than wavelength / 16) so that the air in it moves as a whole, without appreciable compression.
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Old Today, 02:21 PM   #8907
TNT is offline TNT  Sweden
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Originally Posted by mabat View Post
I may be wrong but I read it as "without moving the center of mass", which can be done.
OK - yes, I can see that.

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