Place the brush on experimental vibration, ultrasonic frequency 50 Hz, 100 Hz, 150 Hz and 200 Hz Motion brush behaves differently based on the frequency of sound waves that make the floor vibrate. This model is based on the movement of the brush and brush the natural frequency of the vibration frequency
by frequency brush could be added to or offset the natural frequency of the brush. Brush with the speed and direction of motion is different. Thus, the vibration frequency with a different brush, making a habit of moving different.
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