Scientists build robot bat wing

by:Keyuan     2020-06-28
Researchers say robotic bat wings can help design a new type of flying wing aircraft.
Scientists have created a robot that imitates the shape and movement of smaller dog wings --
Fruit bats (
Cynopterus brachyotis), a medium-
Bat size from Southeast Asia, and its aerodynamics has been analyzed in depth in past studies.
Researcher Joseph Balman, a biologist and engineer at Brown University, told TechNewsDaily: \"Bats are some of the most spectacular flying objects . \".
\"Their wing structure is very different from what you find in birds and insects.
There is a joint on the shoulder of the insect.
The bird has three wing joints on the shoulder, elbow and wrist.
Each finger of the bat also has several joints, providing up to 25 joints on the wings, all of which allow it to significantly change the shape of the wings, more operability and fine control over the flight. \" The eight-
Inch mechanical wings mimic bat anatomy, and eight plastic bones match the true proportion of bats.
Three Motors pull the endonlike cable, which in turn pulls its seven joints.
The entire rig is covered with flexible silicone rubber skin. [Holy Bat Trick!
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\"When it comes to building micro-aircraft, bat wings have a lot of interest,\" said bahlman. \"in order to make small flying robots, these robots can be sent to places that are too small or unsafe for people. \".
\"There are a lot of places where you need a camera that is slow to maneuver.
\"When the sensor records the aerodynamics generated by the moving wing, the robot is designed to flip in a wind tunnel.
By measuring the power output of the servo motor, scientists can evaluate the energy needed to perform wing movements.
This robot doesn\'t exactly fit the complexity of the true bat wings, it has 25 joints and 34 different ways of moving.
Still, artificial wings allow researchers to test beats with living animals that researchers will never be able.
For example, scientists cannot ask bats to slap their wings 8 times per second, not 9 times.
\"This is not how they really work together,\" said Bahlman . \".
Instead, researchers can experiment with all aspects of the model.
\"We can answer the question, \'Will increasing the beat of the wing increase the lift? What is the energy cost of doing this? \'? Said Balman.
Preliminary testing of robots has revealed how real bats fly.
For example, the researchers analyzed the aerodynamic effects of wing folding
Bats and some birds fold back their wings as they rise.
Experiments on robotic wings have shown that folding helps lift animals.
In the flapping animals, the positive lifting is generated by the lower stroke, but some of them are revoked by the subsequent upper stroke, which pushes the air in another way.
The test of organic wing folding and no wing folding showed that the folding wing increased the net lift by 50% on the rising stroke.
Even if the robot does not work properly, researchers have discovered it.
\"We learned a lot from trying to copy bats and making mistakes about how bats work,\" said Bahlman . \".
For example, during the test, the joints used for mechanical bat elbows are repeatedly broken --
The troops on the wing kept the joint apart until it broke.
Bahlman ended up having to wrap the steel cord around the joint to keep it combined, a solid and lightweight solution similar to the ligaments around the real elbow.
Similarly, the robot wing film often tears at its front edge, prompting Bahlman to reinforce the position with elastic threads.
This solution is similar to strengthening the tendons and muscles at the front of the actual bat wings, emphasizing the importance of these structures.
\"Manufacturing robots teach us a lot about bats and tell us why they are built like they are now,\" said Bahlman . \".
Now that researchers already have a working model, they plan to use it to answer many questions that are impossible to answer on live bats.
\"The first step involves changing the wing motion parameters to understand the impact this has on flight performance,\" said Bahlman . \".
\"The next step is to start playing these materials.
We want to try different wing materials, different bone flexibility to see if there is a good trade
Changes in the properties of these materials.
He added: \"Future issues include changing the shape of the wing.
The scientists gave a detailed introduction to their findings in February.
Published in the journal bio-inspired and bionic.
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