The Secret To Better Soft-Bodied Robots Might Be Found In Elephant Trunks
The Secret To Better Soft-Bodied Robots Might Be Found In Elephant Trunks
The Army is paying for investigations on the physics of elephant trunks — and researchers say these versatile appendages may hold clues for designing better soft-bodied robots.
ARI SHAPIRO, HOST:
An elephant's trunk is amazingly versatile, used for all types of things.
ANDREW SCHULZ: The first is manipulation - so grabbing, sucking up objects. The second is breathing, sound production, talking to different elephant herds, touch. And finally, olfaction - so smelling.
DAVID HU: Yeah, the trunk's really the - how they can deal with the world in a gentle way.
SHAPIRO: That's Georgia Tech Ph.D. student Andrew Schulz and his adviser, David Hu. With funding from the Army - which we'll explain later - they investigated elephant trunk suction.
MARY LOUISE KELLY, HOST:
But first, they needed an elephant. Zoo Atlanta was willing to help. The scientists presented an African elephant there with cubes of carrot, rutabaga and potato, which the elephant hoovered up with ease, as you can hear.
(SOUNDBITE OF ELEPHANT TRUNK SUCKING)
SHAPIRO: They also challenged the elephant to lift a thin, very breakable tostada.
HU: And I said, we don't think this elephant can pick this thing up. But amazingly, it did.
SHAPIRO: Meanwhile, they used video and ultrasound to study the elephant's trunk inside and out.
KELLY: Using those observations, along with some math, they calculated that elephants suck in air at more than 330 miles per hour. That is 30 times faster than a human sneeze. It is on par with the speed of a bullet train. The research was published by the Royal Society.
SHAPIRO: And as for why the Army funded this work? Well, here's Schulz.
SCHULZ: If you look at things like flexibility and strength, they're commonly as, like, opposites - right? - where if something's really flexible, it's not strong at all.
SHAPIRO: He points out that elephant trunks are both of those things.
KELLY: And David Hu says that makes trunks an ideal model for gentle robots, which might pick up fruit or help the elderly.
HU: And so the Army was just fascinated by this idea of being, you know, gentle enough to pick up a peanut but strong enough to push down a door if you need to.
SHAPIRO: As for whether humans can lift a tortilla chip by sniffing? Well, they did the math on that, too, and say it is likely infeasible.
KELLY: Infeasible doesn't mean you can't try it at home.
(SOUNDBITE OF FM-84'S "EVERYTHING")
Copyright © 2021 NPR. All rights reserved. Visit our website terms of use and permissions pages at www.npr.org for further information.
NPR transcripts are created on a rush deadline by an NPR contractor. This text may not be in its final form and may be updated or revised in the future. Accuracy and availability may vary. The authoritative record of NPR’s programming is the audio record.