In 1939, a Russian engineer proposed the concept of a "flying submarine" that seamlessly transitioned from air to water, but for decades there have been few successful design precedents. Harvard University's official website recently said that the school's micro-robot laboratory has taken the design of flying submarines a step forward. They designed flying bees, also known as "insect robots", to fly both in the air and in the water.
Designing a flying submarine faces the challenge of "conflicting", the aircraft requires a larger wing to provide lift, while the underwater vehicle needs to reduce the surface area to reduce drag. Engineers at Harvard University have found inspiration from the design of the puffin. This gorgeous ostrich is the most natural "hybrid car" in nature, and is free to travel to and from the air and underwater.
At the International Conference on Intelligent Robotics and Systems held in Germany, Harvard University's Micro Robot Lab Chen Kaiwen was named the Best Student Paper Award for the first author's related paper. Through various theoretical, computational, and experimental studies, Chen Kaiwen's team found that the puffing puffins have very similar dynamic mechanisms in the air and in the water. In both cases, the wings are swinging back and forth, the only difference being the speed of the swing. .
The "insect robot" can fly and travel to the research team to design the first robotic bee that can fly and swim. It is smaller than the paper clip, and its micro-wings can be driven up to 120 times per second. But it is so small, so light, there is no way to break the water tension. In order to overcome this obstacle, the machine bee will hover over the water at an angle, temporarily turn off the engine, and then sink into the water to dive.
The density of water is the second biggest obstacle faced by machine bees. The second author of the paper, Farrell Herbling, explained that the density of water is 1000 times that of air. If the frequency of the bee wings is not adjusted, it is easy to be destroyed. To this end, the research team reduced this frequency from 120 times per second to 9 times per second, but at the same time maintained the dynamic mechanism of the turbulence and the same hinge design.
Although these designs ensure a seamless transition from the airborne to the underwater of the machine bees, the reverse is not possible, because when it comes out of the water, it does not produce enough lift, which is the next step for the research team to overcome.
Chen Kaiwen said that the analysis of flapping wing motion is not limited to insect-sized micro-aircraft. This theory has the potential to design larger bionic robots.
Designing a flying submarine faces the challenge of "conflicting", the aircraft requires a larger wing to provide lift, while the underwater vehicle needs to reduce the surface area to reduce drag. Engineers at Harvard University have found inspiration from the design of the puffin. This gorgeous ostrich is the most natural "hybrid car" in nature, and is free to travel to and from the air and underwater.
At the International Conference on Intelligent Robotics and Systems held in Germany, Harvard University's Micro Robot Lab Chen Kaiwen was named the Best Student Paper Award for the first author's related paper. Through various theoretical, computational, and experimental studies, Chen Kaiwen's team found that the puffing puffins have very similar dynamic mechanisms in the air and in the water. In both cases, the wings are swinging back and forth, the only difference being the speed of the swing. .
The "insect robot" can fly and travel to the research team to design the first robotic bee that can fly and swim. It is smaller than the paper clip, and its micro-wings can be driven up to 120 times per second. But it is so small, so light, there is no way to break the water tension. In order to overcome this obstacle, the machine bee will hover over the water at an angle, temporarily turn off the engine, and then sink into the water to dive.
The density of water is the second biggest obstacle faced by machine bees. The second author of the paper, Farrell Herbling, explained that the density of water is 1000 times that of air. If the frequency of the bee wings is not adjusted, it is easy to be destroyed. To this end, the research team reduced this frequency from 120 times per second to 9 times per second, but at the same time maintained the dynamic mechanism of the turbulence and the same hinge design.
Although these designs ensure a seamless transition from the airborne to the underwater of the machine bees, the reverse is not possible, because when it comes out of the water, it does not produce enough lift, which is the next step for the research team to overcome.
Chen Kaiwen said that the analysis of flapping wing motion is not limited to insect-sized micro-aircraft. This theory has the potential to design larger bionic robots.
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