Abstract
Vibration modes of a human skull exposed to vibration at low frequencies (20–240 Hz) were studied by means of holographic interferometry. In the frequencies examined, the skull behaved as a single mass and showed rotating vibratory movement around a horizontal or a perpendicular axis which passed near the foramen magnum where the skull was fixed to the vibration-proof table.
By measuring the transmissibility of vibration energy through the skull, it was found that there was a resonance at about 80 Hz and that this peak was caused by the structure connecting the basal part of the skull to the supporting stand, which corresponded to the neck. This shows that, although the holographic technique is successful in determining vibration modes, the methods of support and excitation must be carefully validated in order to produce useful results.
Get full access to this article
View all access options for this article.