Cutting and flicking128 brushes are two types of gutter brushes that sweep the debris that lies in the gutter towards the main sweeping mechanism of a street sweeper. As most of the debris is commonly found in the gutter, the operation of gutter brushes is important. In this work, the concept of oscillatory gutter brushes is studied. Qualitative experimental tests are carried out to determine frequencies at which enhanced vibration patterns of the bristles of cutting and flicking128 brushes are obtained. The brushes are rotated at variable angular speed, first in free rotation, and then against a concrete test bed. The findings are analyzed in the light of previous theoretical results. The results suggest that bristle vibrations may be excited at the first natural frequency of the bristles for both brush types. Notably, the trends indicate that when the frequency is a third of the first natural frequency, a resonant condition seems to occur. The results also indicate that an equivalent length for bristle vibration has to be calculated, due to the way in which the bristles are clamped into the mounting board. This equivalent length is necessary for the comparison between the experimental and analytical results. These tests are useful in the determination of frequencies that may be potentially helpful during sweeping.

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