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#1
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acoustic impeadance
Hi,
Can anyone shed light on the acoustic load on a piston in infinate baffle? I know (vaguely) how it is calculated, but it has real and imaginary parts. What to do with them? Is it something to do with reactive intensity? yours Richard Pickworth |
#2
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acoustic impeadance
richard pickworth wrote:
Hi, Can anyone shed light on the acoustic load on a piston in infinate baffle? I know (vaguely) how it is calculated, but it has real and imaginary parts. What to do with them? Is it something to do with reactive intensity? yours Richard Pickworth In a nut shell: It's related to energy storage as the air is compressed. The sound wave propigates (real part) and also pushes back at the piston (imaginary part) I'll leave what to do with then to someone else. Later... Ron Capik -- |
#3
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acoustic impeadance
richard pickworth wrote:
Hi, Can anyone shed light on the acoustic load on a piston in infinate baffle? I know (vaguely) how it is calculated, but it has real and imaginary parts. What to do with them? Is it something to do with reactive intensity? yours Richard Pickworth In a nut shell: It's related to energy storage as the air is compressed. The sound wave propigates (real part) and also pushes back at the piston (imaginary part) I'll leave what to do with then to someone else. Later... Ron Capik -- |
#4
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acoustic impeadance
richard pickworth wrote:
Hi, Can anyone shed light on the acoustic load on a piston in infinate baffle? I know (vaguely) how it is calculated, but it has real and imaginary parts. What to do with them? Is it something to do with reactive intensity? yours Richard Pickworth In a nut shell: It's related to energy storage as the air is compressed. The sound wave propigates (real part) and also pushes back at the piston (imaginary part) I'll leave what to do with then to someone else. Later... Ron Capik -- |
#5
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acoustic impeadance
"richard pickworth" wrote in message ...
Hi, Can anyone shed light on the acoustic load on a piston in infinate baffle? I know (vaguely) how it is calculated, but it has real and imaginary parts. What to do with them? Is it something to do with reactive intensity? yours Richard Pickworth The air is moved by the piston, and it has a mass. The imaginary part of your equation corresponds to the effective air mass as seen by the piston. And yes, a mass since the mass is reactive, it can take reactive power. Also, as the piston moves, some power is dissipated into the space, in terms of the propagating sound wave. The real part of your equation supplies a resistive component that can dissipate this (active) power. |
#6
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acoustic impeadance
"richard pickworth" wrote in message ...
Hi, Can anyone shed light on the acoustic load on a piston in infinate baffle? I know (vaguely) how it is calculated, but it has real and imaginary parts. What to do with them? Is it something to do with reactive intensity? yours Richard Pickworth The air is moved by the piston, and it has a mass. The imaginary part of your equation corresponds to the effective air mass as seen by the piston. And yes, a mass since the mass is reactive, it can take reactive power. Also, as the piston moves, some power is dissipated into the space, in terms of the propagating sound wave. The real part of your equation supplies a resistive component that can dissipate this (active) power. |
#7
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acoustic impeadance
"richard pickworth" wrote in message ...
Hi, Can anyone shed light on the acoustic load on a piston in infinate baffle? I know (vaguely) how it is calculated, but it has real and imaginary parts. What to do with them? Is it something to do with reactive intensity? yours Richard Pickworth The air is moved by the piston, and it has a mass. The imaginary part of your equation corresponds to the effective air mass as seen by the piston. And yes, a mass since the mass is reactive, it can take reactive power. Also, as the piston moves, some power is dissipated into the space, in terms of the propagating sound wave. The real part of your equation supplies a resistive component that can dissipate this (active) power. |
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