Aboriginal sporting traditions included wrestling, spear-throwing contests, sham fights, various types of football using possum-skin balls, spinning discs and stick games".
As shown in Figure 2b, all centers of the screw, bionic ball-shaped bone, and skin contact ball are aligned on a line in order to reduce the shear force and twist distortion during the operation.
The diameter of the skin contact ball is 10 mm, back side of the ball is glued with the sensing film, and the open side directly contacts with the radial pulse location of wrist.
To further verify the biomimetic performance of the sensing structure that is close to the structure advantage of the human fingertip, an experiment was conducted to investigate the force-displacement relationship of serially connected components in the sensing structure consisting of a rigid skin contact ball, a sensing film, a silicone elastic damper, and a ball-shaped bone structure.
The laser distance sensor OADM 20I6X41/S14F was set up on the vibration-isolated workstation and its laser beam perpendicularly shoot on the moving stage of the micromanipulator for tracking the displacement change of the skin contact ball in the developed radial pulse sensor, when the digital force gauge is controlled to push/release the contact ball during the calibration.
Figure 6 plots all experimental data including pushing/releasing force, the developed sensor output, and pushing/releasing displacement on the skin contact ball of the sensor.
They're all so ergonomically satisfying to look at, and I'm pleased to see in this section there's not a faux skin hairy ball in sight.
Soft, tanned skin against ball-bearing road grit and centrifugal force.
We demonstrate the method's usefulness in generating interpolating skins of balls of different sizes and in various configurations.
He settled on a banquette in a room whose animal skins, crystal balls and somber lighting lent it the air of a well-appointed opium den.
