Technical Paper
An Alternative Solution to Vehicles Audio System using Inertial Transducers Integrated in Trim Parts: Advanced Developments.
2022-06-15
2022-01-0970
The use of inertial transducers to replace traditional loudspeakers is an innovative way to reproduce a quality audio signal in a vehicle cockpit while significantly reducing on-board mass and overall volume of the audio system. An electrodynamic inertial exciter is an actuator commonly used for the realization of distributed mode loudspeakers or DML (Distributed Mode Loudspeaker) to generate vibrations of a panel radiating an acoustic wave. As for a loudspeaker, an inertial exciter implements a coupling process and is based on the interactions between a current and a magnetic field. The coil is movable and the magnetic mass stationary in the case of the loudspeaker, while the reverse is true for the inertial exciter. This paper presents the development process of a new inertial transducer and its optimization by digital simulation, validated by tests on physical prototypes.