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Ex-NASA Engineer Made the Perfect Rock Skipping Robot Ex-NASA engineer and YouTube inventor Mark Rober have made a perfect rock-skipping robot. Not only can the robot perform impressively, but it can help you learn how to skip rocks better too. Rober built the robot by tweaking a clay pigeon thrower, creating wooden custom throwing arms and a base for stability. Once he built a prototype, his team of assistants (nieces and nephews) gave Skippa, the rock-throwing robot makeover with spray paint and giant googly eyes, and then brainstormed test variables for a perfect skip. How do you achieve the perfect rock skip? The team narrowed it down to four variables: the wrist angle of the robot (the angle of the rock relative to the water), the arm angle of the robot (which changes the path of the rock), and the rocks used (variations in diameter and thickness). To create uniform controls for robot tests, Rober and his team made their own rocks out of unfired clay (the clay discs easily dried in the sun, and dissolved in water under 30 mins). After the robot tested some unsuccessful skips, it began to shoot rocks tumbling across the water in over 60 skips per throw. Here’s the recipe Rober finally found for the perfect rock skip: the rock should hit at a 20-degree angle to the water, with a 20-degree path, and a higher throw for more energy. Flicking the wrist as much as possible will help the rock spin, which will help the rock stable. And finally, the most important factors for rock selection is a flat bottom and finding a rock that’s heavy but not too big to handle. When Rober’s amateur engineering team tested the principles they learned from the robot, they were quickly able to improve their skips from an average of three to 16 skips. Content gathered by BTM robotics training centre, robotics in Bangalore, stem education in Bangalore, stem education in Bannerghatta road, stem education in JP Nagar, robotics training centres in Bannerghatta road, robotics training centres in JP Nagar, robotics training for kids, robotics training for beginners, best robotics in Bangalore.
Next-generation robotic cockroach can explore under water environments. The next generation of Harvard's Ambulatory Micro robot (HAMR) can walk on land, swim on the surface of water, and walk underwater, opening up new environments for this little bot to explore. In nature, cockroaches can survive underwater for up to 30 minutes. Now, a robotic cockroach can do even better. Harvard's Ambulatory Microrobot, known as HAMR, can walk on land, swim on the surface of water, and walk underwater for as long as necessary, opening up new environments for this little bot to explore. This next generation HAMR uses multifunctional foot pads that rely on surface tension and surface tension induced buoyancy when HAMR needs to swim but can also apply a voltage to break the water surface when HAMR needs to sink. This process is called electro wetting, which is the reduction of the contact angle between a material and the water surface under an applied voltage. This change of contact angle makes it easier for objects to break the water surface. Moving on the surface of water allows a microrobot to evade submerged obstacles and reduces drag. Using four pairs of asymmetric flaps and custom designed swimming gaits, HAMR robo-paddles on the water surface to swim. Exploiting the unsteady interaction between the robot's passive flaps and the surrounding water, the robot generates swimming gaits similar to that of a diving beetle. This allows the robot to effectively swim forward and turn. "This research demonstrates that microrobotics can leverage small-scale physics—in this case surface tension—to perform functions and capabilities that are challenging for larger robots, " said Kevin Chen, a postdoctoral fellow at the Harvard John A. Paulson School of Engineering and Applied Sciences (SEAS) and first author of the paper. The most recent research is published in the journal Nature Communications. "HAMR's size is key to its performance, " said Neel Doshi, graduate student at SEAS and co-author of the paper. "If it were much bigger, it would be challenging to support the robot with surface tension and if it were much smaller, the robot might not be able to generate enough force to break it." HAMR weighs 1.65 grams (about as much as a large paper clip), can carry 1.44 grams of additional payload without sinking and can paddle its legs with a frequency up to 10 Hz. It's coated in Parylene to keep it from shorting under water. Once below the surface of the water, HAMR uses the same gait to walk as it does on dry land and is just as mobile. To return to dry land HAMR faces enormous challenge from the water's hold. A water surface tension force that is twice the robot weight pushes down on the robot, and in addition the induced torque causes a dramatic increase of friction on the robot's hind legs. The researchers stiffened the robot's transmission and installed soft pads to the robot's front legs to increase payload capacity and redistribute friction during climbing. Finally, walking up a modest incline, the robot is able break out of the water's hold. This robot nicely illustrates some of the challenges and opportunities with small-scale robots, " said senior author Robert Wood, Charles River Professor of Engineering and Applied Sciences at SEAS and core faculty member of the Harvard Wyss Institute for Biologically Inspired Engineering. "Shrinking brings opportunities for increased mobility—such as walking on the surface of water—but also challenges since the forces that we take for granted at larger scales can start to dominate at the size of an insect." Content gathered by BTM robotics training center, robotics in Bangalore, stem education in Bangalore, stem education in Bannerghatta road, stem education in JP nagar, robotics training centers in Bannerghatta road, robotics training centers in JP nagar, robotics training for kids, robotics training for beginners, best robotics in Bangalore.
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