Naslov
Calorimetric Evaluation of Intrinsic Friction in the Loudspeaker Membrane

Autori
Petošić, Antonio ; Đurek, Ivan ; Đurek, Danijel

Vrsta, podvrsta i kategorija rada
Radovi u zbornicima skupova, cjeloviti rad (in extenso), znanstveni

Izvornik
125th AES Convention, Convention papers / - San Francisco (CA), 2008

Skup
125th AES Convention

Mjesto i datum
San Francisco (CA), Sjedinjene Američke Države, 02.10.2008. - 05.10.2008

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
loudspeaker membrane ; intrinsic friction ; calorimetry

Sažetak
Friction losses in the vibrating system of an electrodynamic loudspeaker are represented by the intrinsic friction Ri, which enters the equation of motion, and these losses are accompanied by irreversible release of the heat. A method is proposed for measurement of the friction losses in the loudspeaker's membrane by measurement of the thermocouple temperature probe glued to the membrane. Temperature on the membrane surface fluctuates stochastically as a result of thermo-elastic coupling in the membrane material. Evaluation of the amplitude in the temperature fluctuations enables an absolute and direct evaluation of intrinsic friction Ri entering friction force F=Ri· ; ?(x), irrespective of the nonlinearity type and strength associated with the loudspeaker operation.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Elektrotehnika

POVEZANOST RADA