Сообщение от bordodynov
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Вы могли и можете получить модели динамиков в моей базе данных
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вот, что я получаю,-и так с большинством ваших моделей...
"Are you interested in simulating speakers?
Manufacturers sometimes give some basic info about the driver's physical
characteristics that can be useful to start the modeling process, but my
example was taken from my work from a few years ago with a prototype
subwoofer that I was then developing.
One gets in the ballpark by starting with the parameters from any model
of a vaguely similar speaker, or by calculating the first cut parameters
from the equations. After that, it is not too much trouble through
trial and error to adjust the parameters to get a near perfect fit to
measurements.
I measured the proto subwoofer's impedance and response on an Audio
Precision analyzer and I went looking for a way to model it so I could
simulate an equalization scheme that uses positive feedback of coil
current. Almost all of the models I found were set in the acoustical-
mechanical domain and didn't capture actual performance all that well
anyway. So I came up with a much more EE friendly model to match the
data. -- analog spiceman
Here is an example of a SPICE model that very accurately mimics
measurement. It is for a speaker with both an actively driven cone
and a passive radiator cone.
First some definitions (skip to the end for a quick peak at the results).
Bl Electromechanical motor constant of the voice coil - this factor
depends on magnet strength, gap geometry and turns in the coil.
It relates coil displacement force to coil current (newtons/amp).
Rvc Rvc is the dc resistance of the voice coil. Rvc1-3 account
for the frequency dependent increase in resistance due to eddy
current losses in the voice coil and surrounding pole pieces.
Lvc Voice coil inductance - decreases with increasing frequency due
to flux squeezing resulting from eddy currents.
Les Cone suspension compliance equivalent inductance: Les = Cm*(Bl)^2
Cm is the mechanical compliance in m/N.
Cem Cone mass equivalent capacitance: Cem = Mm/(Bl)^2
Mm is the mechanical mass in kg.
Res Cone suspension loss equivalent resistance: Res = (Bl)^2/Lm
Lm is the mechanical losses in inverse seconds.
Fa Acoustic output factor - goes up with cone area and motor
efficiency and goes down with cone mass, but has almost no
effect on electrical impedance.
Note: RLesa and RLesp are added to avoid convergence problems with
SPICE and Ro allows summing the current dependent current sources
that model the acoustic output factor of the two cones in the system.
The Model:
/ Voice \ / Active \ Air in / Passive \
/ Coil \ / Piston \ Box / Piston \
Rvc Lvc0 Leb
o--./\/\/`--+--@@@@--+-------+-------+--@@@@@--+-------+-------+
3.8 | 4.5m | | | 62m | | |
/ | | | | | |
Rvc1 \ | | | RLeb | | |
3 / | | +-./\/\/`-+ | |
| Lvc1 | | | 200 | | |
+--@@@@--+ | | | | |
| 3.0m | | | | | |
/ | | | | | |
Rvc2 \ | | | | | |
15 / | | | | | |
| Lvc2 | Cema | (@ Lesa | Cemp | (@ Lesp
+--@@@@--+ === (@ | === (@
| 2.0m | 0.5m | (@ 200m | 1.5m | (@ 110m
/ | | | | | |
Rvc3 \ | | | | | |
75 / | | / / | /
| Lvc3 | | \ RLesa \ Resp | \ RLesp
+--@@@@--+ | / 1m / 80 | / 1m
1.3m | | | | | |
/ | +---+ | | +---+
Resa \ Faa | ,!. | | Fap | ,!. |
90 / [i]( I ) | | [i]( I ) |
| 588m | `+' | | -235m | `+' |
| | | | | | | |
o------+-------------+-------+---}---+----+----+-------+---)---+
_|_ | / |
/ / / Acoustic | Ro \ 1 ohm |
Output | / |
Vo o--+--------+----------------+
The Results:
Speaker Impedance
100 +-----------+-----------+-----------+-----------+
| ' | ' | ' | ' |
| ' | | | ' | ' _|
ohms | - - + - - | ! - l - | - - + - - | - - + _," |
| ' | l ; : | ' | _,-" |
| ' |; : ; ` | ' _,-" ' |
10 +-----------+--\-;---\--+-------_,-" -----------+
| ' _/| v ' \ | _,-" | ' |
|~----**"" | ' "*--" ' | ' |
ohms | - - + - - | - - + - - | - - + - - | - - + - - |
| ' | ' | ' | ' |
| ' | ' | ' | ' |
1 +-----------+-----------+-----------+-----------+
1Hz 10Hz 100Hz 1kHz 10kHz
Acoustic Output
1V +-----------+-----------+-----------+-----------+
| ' | ' | ' | ' |
| ' | ' _.--.._ ' | ' |
100mV | - - + - - | - -__.-"- | - -`+~._- | - - + - - |
| ' | / ' | ' `~~..__ ' |
| ' | ; ' | ' | `~~..__|
10mV +-----------+-y---------+-----------+-----------+
| ' | | ' | ' | ' |
| ' __| ; ' | ' | ' |
1mV | - - -,-" \/- - + - - | - - + - - | - - + - - |
| _,-" | ' | ' | ' |
| / ' | ' | ' | ' |
0.1mV +"----------+-----------+-----------+-----------+
1Hz 10Hz 100Hz 1kHz 10kHz "
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Сообщение от bordodynov
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Но вы не любопытны.
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-мало-ли у кого чего есть...,-сидеть в бане с отдавленным носом-не радостная перспектива. Вот просимулировал Вашу модельку, на среднечастотный смахивает...
АСанализ показал, точно, СЧ
