Analysis of Viscoelasticity and Residual Strains in an Electrodynamic Loudspeaker

Djurek I, Petosic A, Djurek D. Analysis of Viscoelasticity and Residual Strains in an Electrodynamic Loudspeaker. In: AES Convention 126. Audio Engineering Society; 2009. Paper 7680. Available from: https://aes.org/publications/elibrary-page/?id=14876

@inproceedings{Djurek2009_14876,
  author = {Djurek, Ivan and Petosic, Antonio and Djurek, Danijel},
  title = {{Analysis of Viscoelasticity and Residual Strains in an Electrodynamic Loudspeaker}},
  booktitle = {AES Convention 126},
  note = {Paper 7680},
  year = {2009},
  month = may,
  publisher = {Audio Engineering Society},
  url = {https://aes.org/publications/elibrary-page/?id=14876}
}

TY  - CPAPER
TI  - Analysis of Viscoelasticity and Residual Strains in an Electrodynamic Loudspeaker
AU  - Djurek, Ivan
AU  - Petosic, Antonio
AU  - Djurek, Danijel
T2  - AES Convention 126
M1  - Paper 7680
PY  - 2009
DA  - 2009/05/06
UR  - https://aes.org/publications/elibrary-page/?id=14876
PB  - Audio Engineering Society
LA  - en
AB  - 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.
ER  -