Quote:
Originally Posted by Eomsy
Taj mi dio nije jasan kada prema formuli na http://www.audioholics.com/education...onant-absorber http://www.audioholics.com/education...onant-absorber...
Dobivam da je :
S=L*V*((f*pi)/0,5*c))2 ... 2 označava "na kvadrat"
...odnosno ...
V=(L*((f*pi)/0,5*c))2) / S
Where f is the resonant frequency (Hz), c is the speed of sound (1120ft/s), pi =3.14, S is the area of the port (ft 2 ), L is the length of the port (ft), and V is the cavity volume (ft 3 ).
Gdjer mi je i dalje S nepoznanica. Zar za S uzmem da mi je površina unutarnjeg ruba cijevi ??? To me muči ...
Ma bit će roštiljade, kada bude sve gotovo i naravno da ste pozvani  !!! |
E fino!!! Jedva čekam!
Ma nije baš neka tajna Helmholtzova formula:
http://en.wikipedia.org/wiki/Helmholtz_resonance
... imaš i kod tog "nerazumljivog" linka:
http://www.audioholics.com/education...onant-absorber
lepo normalno obrazloženo:
"Where f is the resonant frequency (Hz), c is the speed of sound (1120ft/s), p =3.14,
S is the area of the port (ft 2 ), L is the length of the port (ft), D is the diameter of the port (ft), and V is the cavity volume (ft 3 ). "
...samo treba malo!!! pažljivije pročitati!
Taj link je stvarno dosta "ekpres edukativan" za ljude bez nekog predznanja oko toga, zato sam ga i objavio.