This work investigates the use of fractional order derivatives in modeling moving-coil loudspeakers. A fractional order state-space solution is developed, leading the way towards incorporating nonlinearities into a fractional order system. The method is used to calculate the response of a fractional harmonic oscillator, representing the mechanical part of a loudspeaker, showing the effect of the fractional derivative and its relationship to viscoelasticity. Finally, a loudspeaker model with a fractional order viscoelastic suspension and fractional order voice coil is fit to measurement data. It is shown that the identified parameters can be used in a linear fractional order state-space model to simulate the loudspeakers’ time domain response.

Authors: King, Alexander; Agerkvist, Finn T.
Affiliation: Technical University of Denmark, Kgs. Lyngby, Denmark
AES Convention: 139 (October 2015) Paper Number: 9413
Publication Date: October 23, 2015
Subject: Transducers

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