PAFEC-VibroAcoustics - Loudspeaker drive unit




 

The drive unit shown was analysed for 3 different configurations:

  • Dustcap (shown in diagram)
  • Dustcap removed
  • Occluding tweeter moulding, with flat cap on former

In all cases, radiation into a half space was analysed, for constant voltage drive excitation. A fully coupled model, including some internal air regions and thermoviscous effects in small gap regions.

 



An axisymmetric model was used. Acoustic finite elements were used to model the internal regions and air immediately in front of the diaphragm. The boundary element method was used for the remainder of the half space.

The pressure distributions shown are for excitation at 3000 Hertz.

 

Response with dustcap


 

On axis response with and without dustcap


 

On axis response with dustcap and with tweeter occultion


 

Pressure amplitude and deformed shape at 3000Hz - with dustcap


 

Pressure amplitude at 3000Hz - without dustcap


 

Pressure amplitude and deformed shape at 3000Hz - with tweeter occultion


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