PAFEC VibroAcoustics

3D Sinusoidal anlaysis of a mobile phone

A number of pre-processors can be used to create meshes for PAFEC, e.g. FEMAP, GiD, AI Environment, Hypermesh and PIGS. In this example the model has been created using FEMAP.

Whichever pre-processor is used the overall procedure is similar, e.g:

• Import geometry, e.g. STEP file
• Create additional lines and curves
• Form surfaces
• Assign mesh densities
• Mesh surfaces
• Export data
• Convert data to PAFEC format
• Run PAFEC analysis
• Post-process results

The example below demonstrates the creation of a mobile phone model. Symmetry has been utilised, therefore only a half model is required.

This model evaluates the effect of the mobile phone shape. The source has been approximated to a rectangular piston in the position of the loudspeaker aperture. More accurate results could be obtained by extending the model to include the internal transducer.

Import geometry

Generate mesh including acoustic display element plane

Convert data to PAFEC format

Detail near loudspeaker piston

The'Mesh2Paf' wizard converts the geometrical data from FEMAP into appropriate PAFEC structural and acoustic elements. Additionally creating other data required for a valid PAFEC data file, such as frequency range and step, microphone positions, etc.

Microphone positions

The PAFEC analysis is now run and results post-processed

SPL (dB) field at 1000 Hz

SPL (dB) field at 5000 Hz

SPL (dB) v Frequency (Hz) graph

This model is a specially created illustrative example, it is not a commercially available phone.