Naslov
Analysis of Viscoelasticity and Residual Strains in an Electrodynamic Loudspeaker

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

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

Izvornik
Convention papers of the 126th Audio Engineering Society Convention : : Papers 7651-7819 / - München, 2009

ISBN
978-0-937803-67-7

Skup
Audio Engineering Society Convention (126 ; 2009)

Mjesto i datum
München, Njemačka, 07.05.2009. - 10.05.2009

Vrsta sudjelovanja
Predavanje

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
loudspeaker; viscoelasticity; distortion

Sažetak
An electrodynamic loudspeaker was analyzed in three steps: (a) as a device supplied by the market, (b) removed upper suspension, and (c) dismantled assembly consisting only of vibrating spider and voice coil. In three steps, resonant frequency and stiffness were measured dynamically for driving currents up to 100 mA, whereas stiffness was also measured quasi-statically by the use of calibrated masses. It was found that widely quoted effect of decreasing resonant frequency, as plotted against driving current, comes from the residual strain in the vibrating material, and significant contribution is associated with the spider. When driving current increases residual strain is gradually compensated, giving rise to the minimum of stiffness, and further increase of resonant frequency is attributed to a common nonlinearity in the forced vibrating system.

Izvorni jezik
Engleski

Znanstvena područja
Fizika, Elektrotehnika

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