IPT 2018
Open Access

Fig. 2


Download original image

Typical Fourier transform. In this case, the experimental conditions were: N = 6, m = 0.3 g, l = 2.7 mm, e = 2.4 mm, frot = 3.7 Hz and R = 9.8 cm. Four identifiable zones (a), (b), (c), (d). Only (c) and (d) are audible as showed by the PSD (Power Spectral Density) integral. (a) Is the macroscopic sound produced by the balloon pushing air during its movement. (b) Is the sound components ranging from 30 to 80 Hz. (c) Is the first eigenfrequency of the membrane. (d) Is the frequency produced by the nut rolling and hitting the membrane. Harmonics are also produced.

Current usage metrics show cumulative count of Article Views (full-text article views including HTML views, PDF and ePub downloads, according to the available data) and Abstracts Views on Vision4Press platform.

Data correspond to usage on the plateform after 2015. The current usage metrics is available 48-96 hours after online publication and is updated daily on week days.

Initial download of the metrics may take a while.