From the pigeons that diagnose cancer to the dogs that sniff bombs, the most peculiar scientific experiments have brought us the most interesting insights.
Recently, the researchers put a small goggle on a parrot's head, hoping to learn more about the mystery of the flight by understanding the air vortex formed by the birds waving their wings and generating lift.
This is important for building a better drone. Currently, there are very mature models that explain the principles of flight and how birds support their weight, and a team at Stanford University is testing these models. Their method is to let a parrot named Obi fly over a laser chip that is covered with particles.
"We will never do this ourselves, and we will never walk through the laser without any protection. So we must find a way to protect the bird," David Lundink, assistant professor of mechanical engineering at Stanford University. LenTInk) said.
The revolutionary flight test of Parrot Obi was carried out in the laboratory of Lundink. Graduate student Eric GuTIerrez made the eye-catching goggles to protect Obi's eyes from dazzling lasers.
Through this move, the research team also promoted the development of a field of flight engineering, and they hoped that this experiment could lead to a more powerful flying robot.
“When birds wave their wings, they move the particles,†says graduate student Diana Chin. “On this plane, we can see how the particles move and then calculate the velocity field. According to the velocity field, We should be able to theoretically calculate the lift that the bird produces during flight."
As Obi flies over the laser, its wings will agitate the illuminated particles to form a visible vortex image for the researchers to record. The results of this experiment show that the eddy current will be broken, rather than being condensed in the air like the atomic wake left by the aircraft.
"The eddy current generated by the aircraft will not be broken after the airplane flies far away, such as more than 1,000 meters. The vortex generated by the birds will be broken very close to the birds within two or three times of the flapping of the wings, and this process It’s much more intense,†Lundink said.
The experimental results provide an unprecedentedly clear eddy current image that is contrary to the traditional model on which today's flying robots are based. “We found that all three models we tested were very inaccurate because their assumptions were not necessarily correct,†said Diana.
“Look at the typical pictures of animal flight, we often think that those animals will produce beautiful and smooth eddy currents during the flight, but the actual situation is much more complicated,†Lundink said. “This is a starting point for us. Now we can Start to really figure out how the animal flies."
“In order to better design the wings of robots, many people focus on the results of research on animal flight. Now, our experiments show that the design methods people use are not as reliable as everyone hopes. We need new research, new Ways to dramatically improve the reliability of the design process."
Of course, if there is no small goggles made by Gutierrez, this experiment will not be possible, or even if it is carried out, the researchers will not be able to work with peace of mind because they are worried about the damage suffered by the parrot.
The lens worn by the parrot is cut by the lens of the human laser goggles, and the frame is made by 3D printing technology. The goggles were securely attached to the Obi head with a veterinary strap and a reflective strip to allow the researchers to more accurately measure Obi's flight speed.
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