3D Digital Image Correlation for vibration measurement on rolling tire: Procedure development and comparison with Laser Doppler Vibrometer

Noise generated from rolling tire is strictly related to vibrations caused by the impacts of tread blocks on the road surface. Performing vibration measurements on rolling tires is a quite complex task and non-contact methods should be exploited. Laser Doppler Vibrometer (LDV) is the technique that has been mainly used so far, but it has some disadvantages, among which the measurement duration represents the main issue. Digital Image Correlation (DIC) could represent an appealing alternative for this kind of measurement. Recent developments in Digital Image Correlation combined with the modern fast cameras could represent an innovative instrument for vibration measurement at high frequency (up to about 1000 Hz depending on rolling speed). This paper analyses the possibility of using 3D DIC for vibration measurement on rolling tire by a direct comparison with LDV. The advantages and disadvantages of both the techniques are highlighted along the paper by analysing data of an impact test (static case) and a rolling measurement