Inspiration from the Sidewinder

Inspiration from the Sidewinder Inspiration from the Sidewinder Inspiration from the SidewinderIn recent years, the field of robotics has been inspired by some seriously fast animals. From the lightning fast cheetah to the gravity-defying hummingbird. Now inspiration is coming from a new source in the animal kingdom the snake.More known for its poisonous characteristics than for the quickness of its movements, a team at Georgia Tech has found they are under the spell of the snakethe sidewinder, specifically. It may take a backseat to the rattler and boa constrictor in terms of infamy, but assistant professor of physics Daniel Goldman assures us the sidewinder snake should not be overlooked.I welches part of building a sand swimming robot with servos, he explains. It got me thinking that we really could use these robots, particularly in these granular environments, as an essential tool to understand the biology. A good part of this was because we didnt necessarily have the mathematica l models of the environment. From the biophysics point of view, like how snakes move around, it was interesting. Then a colleague, David Hu, said that sidewinders look so crazy and they only hang out in sandy, loose environments so why is their gait so good?That set the wheels in motion and collaboration increased. Joe Mendelson (at Zoo Atlanta) helped coordinate the building of a shed in the back of a zoo with a device called a fluidized bed. Its basically a bed of sand with a porous bottom where you can flow air up and the sand bubbles and turns into a fluid, he says. And it ultimately allows the animal to not experience tracks of the animals before, Goldman says.Studying the unique motion of sidewinder snakes. Shown (l-r) are Dan Goldman of Georgia Tech, Hamid Marvi of Carnegie Mellon and Joe Mendelson of Zoo Atlanta. Image Rob Felt / Georgia TechSidewinders were brought in and they found these snakes were great collaborators themselves, sidewinding almost on command, he says. I was also collaborating with Howie Choset Carnegie Mellon University Robotics Professor and he was building snake robots for a long time and was interested in them for search and rescue, but his robots were having trouble with sandy slopes. He teamed up with us and he brought a robot to the zoo. We could manipulate the parameters in a way we like to do as physicists and landsee how sensitive locomotion is to it. On flat sand, its not sensitive but on kilted, on sand dunes, it is. Sidewinding ends up being a gait thats quite good on level sand. And its really good on slopes, providing a flexible way to control your body.This helped the Modsnake at Carnegie Mellon University, a robot that is a meter long with 16 modules. Over here, we do it like a physicist, we dont do it like the real world. We want it to work in a laboratory. We had one postdoc make a 3D printed sidewinding multilink robot. What we discovered was to generate sidewinding you can use ways to make sidewinding what you w ould see in animals and, in some ways, what you wouldnt.Goldman says the work showed him that not only is the sidewinder snake relatively simple to think about but its relatively simple to control. Its a beautiful and effective way to move, he says. And yet how easy it could be to overlook this snake.Eric Butterman is an independent writer. For Further Discussion Sidewinding ends up being a gait thats quite good on level sand. And its really good on slopes, providing a flexible way to control your body.Prof. Daniel Goldman, Georgia Tech