Starfish inspired underwater robots.
Starfish inspired underwater robots.
Researchers in the United States have developed an underwater robot capable of ascending, descending, moving forward, moving backward, and even rotating on its own axis—all controlled by just two actuators. This invention was presented by engineers from North Carolina State University in a study published in the scientific journal *Science Advances*.
This innovative aquatic device stands out for its versatile movement, as it can switch between different locomotion patterns depending on mission requirements. For instance, in "jellyfish mode," the robot moves its four limbs simultaneously with elastic strokes to achieve a stable vertical ascent; in "fish mode," it uses one of its arms as a rudder to turn laterally; and by activating its channels sequentially with a time offset, it enters a "rotor mode" that allows it to spin on its own axis while continuously gaining altitude.
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Two actuators doing all that work is the detail I kept coming back to. The jellyfish mode for a steady climb and the rotor mode for spinning on the spot make a simple design feel clever, not limited. A camera squeezing into narrow spaces is a neat real use for it.