AES E-Library

Simulation of a 4" Compression Driver Using a Fully Coupled Vibroacoustic Finite Element Analysis including Viscous and Thermal Losses

A 4" JBL compression driver is simulated using a finite element analysis, FEA. Compared to a conventional electrodynamic driver a compression driver has a phase plug with slits in front of the diaphragm. The slits are acoustically narrow and the diaphragm is separated from the phase plug only by a thin gap so an accurate model must include viscothermal effects to account for the losses associated with the narrow air gaps. Air domains, structural domains and viscothermal domains are all fully coupled to ensure the proper continuity of their variables. Simulated results are compared to experimental measurements and it is demonstrated how the viscothermal effects dampen out acoustic and structural modes.

Authors: Christensen, René; Skov, Ulrik
Affiliation: iCapture ApS, Gadstrup, Denmark
AES Convention:132 (April 2012) Paper Number:8672 Import into BibTeX
Subject:Transducers

Click to purchase paper or login as an AES member. If your company or school subscribes to the E-Library then switch to the institutional version. If you are not an AES member and would like to subscribe to the E-Library then Join the AES!

This paper costs $20 for non-members, $5 for AES members and is free for E-Library subscribers.

Learn more about the AES E-Library

E-Library Location: (CD 132Papers)   /conv/132/8672.pdf

Start a discussion about this paper!