Predicting the Acoustic Power Radiation from Loudspeaker Cabinets: a Numerically Efficient Approach

摘要

Loudspeaker cabinets should not contribute at all to the total sound radiation, but aim instead to be a perfectly rigid box which encloses the drive units. To achieve this goal, state of the art FEM software packages and Doppler vibro-meters are the tools at our disposal. The modelling steps covered in the paper are: measuring and fitting orthotropic material properties, including damping; 3D mechanical modelling with a curvilinear coordinates system and thin elastic layers to represent glue joints; scanning laser Doppler measurements and single point vibration measurements with an accelerometer. Additionally a numerically efficient post-processing approach used to extract the total radiated acoustic power and an example of what kind of improvement can be expected from a typical design optimization are presented.