Researchers have created a pigeon-inspired robot with bird-like reflexes, enabling it to stay stable in turbulent conditions. Scientists have developed a robot that is inspired by pigeons and has birdlike reflexes. This allows it to remain stable even in the most turbulent of conditions.
To regulate its movements, researchers developed PigeonBot II, a bioinspired aerial robot with morphing wings and a tail designed to mimic bird-like movements using a biomimetic skeleton and real pigeon feathers. Researchers developed PigeonBot II to regulate the robot's movements. It is a bioinspired aerial robotic with morphing wing and tail, designed to mimic birds movements by using biomimetic bones and feathers.
The robot can tilt, expand, elevate, or move its tail from side to side in addition to spreading its wings. In addition to its wings, the robot's tail can be moved from one side to another, it can also tilt, extend, raise, or elevate.
Wind tunnel and outdoor tests showed that reflexive tail adjustments and wing morphing mitigated Dutch roll instability and enabled stable, autonomous flight during takeoff, cruising, and landing. In wind tunnel tests and in the open air, it was found that wing morphing and reflexive adjustments to the tail could reduce Dutch roll and enable stable autonomous flight at takeoff, cruise, and landing.
According to the team led by Eric Chang from Stanford University, the findings shed light on how birds, as opposed to airplanes, can fly steadily without a rudder or vertical tail. The findings of the Stanford University team, led by Eric Chang, shed light on the ability for birds to fly without the use of a vertical tail or rudder.
Birds, unlike airplanes, glide without a rudder by constantly adjusting their wing and tail shapes. For pitch control, airplanes use fixed structures such as horizontal tails and vertical tails. While airplanes can use wing sweep or special designs to manage stability without a vertical tail, birds achieve rudderless flight more efficiently across diverse wing shapes without relying on drag-based mechanisms.
Pigeons, for example, show consistent reflexes when rolled, pitched, or yawed. When rolled, yawed, or pitched, pigeons show consistent reactions. These reflexes are stronger when simulated flight conditions, like air blowing on their feathers, are introduced. Birds can stabilize their flight using these reflexes, just like an airplane.
Aerodynamic studies and simulations suggest that pigeons' reflex-driven wing and tail adjustments are key to maintaining flight stability. The understanding gained from this study could lead to more radar-stealthy autonomous flying vehicle designs.
The team developed TailBot, a robotic platform with fixed foamboard wings, an adjustable tail featuring 12 real pigeon feathers, and an adaptive reflexive control system. TailBot is a robot platform that features 12 feathers from pigeons and a tail with an adjustable design. The tail could be furled, unfurled, tilted, and moved side to side.
Indoor tests showed TailBot could reflexively adjust its tail to counter Dutch roll instability, but outdoor flights faced turbulence, resulting in crashes. To address these challenges, they created PigeonBot II, an advanced version equipped with wrist-mounted propellers, morphing wings, pigeon-like wingtips, and 52 real pigeon feathers.
Wind tunnel experiments allowed PigeonBot II to fine-tune its reflexive control system, enabling coordinated adjustments of wing shape and tail angle. These enhancements helped PigeonBot II overcome turbulence and Dutch rolls. The adaptive reflex parameters supported outdoor autonomous operations, including takeoff, cruising, and landing.
"This work confirms how birds can accomplish rudderless flight via reflex functions and can inspire rudderless aircraft with reduced radar signature and increased efficacy," the researchers said in a statement. The details of the team's research were published in the journal Science Robotics.