Researchers used an artificial muscle which moves in response to change in the temperature around it.
that moves in response to changes in the temperature around it. TCPs are lightweight and low-cost devices, which can generate large strokes and output high power., the researchers from the University of Bristol optimized the structural design by bringing the TCP at one end of the robot fish closer to the spring on the other side. This allowed the fin at the rear end of the robot to swing at a larger angle and reach new speeds.
The team ran several static tests and free-swimming tests with the robotic fish prototype. The robot reached a speed of 25.7 mm/s, outperforming previous TCP-driven aquatic robots. Lead author Tsam Lung You said: “They can be made from very easily accessible materials such as a fishing line and they contract and provide linear actuation when heated up. However, because of the time needed for heat dissipation during the relaxation phase, this makes them slow.”The team also did a preliminary investigation for higher swimming efficiency by using flexible fin materials. Apart from this, they are also working on exploring alternative designs to increase TCP actuator frequency.
In the press release, the researchers point out that until now, TCPs were mostly used in wearable devices and robotic hands, but the robot fish opens up more areas of TCP application, such as marine robots for underwater exploration and monitoring.Twisted and coiled polymer actuator is a promising novel actuator, exhibiting attractive properties of light weight, low cost, high energy density and simple fabrication process.
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