Yesterday’s ideas can be full of promise. Especially, perhaps when they were worn by Leonardo da Vinci. This is what researchers have imagined. And that’s how they found a way to make our drones quieter.
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In recent years, more and more people have been complaining… about the noise made by drones flying overhead. And experts expect that nuisancesnuisances are getting worse with the proliferation of uses such as parcel delivery or emergency interventions carried out using drones. But researchers from the Johns Hopkins Whiting School of Engineering (United States) may have found a solution to this problem. They explain, in the bulletin de l’American Physical Societyhow they intend, to do this, to exploit a device invented by Leonardo da Vinci more than 500 years ago: the aerial screw.
For the drone propeller, switch from the blades to the screw
To understand, you must first identify the origin of the problem. The characteristic hum of drones is in fact produced by what the physicistsphysicists call a « vortexvortex peak “. So many miniature tornadoes which are created by the rotation of the flat, thin and inclined blades. However, screw-shaped propellers, like those imagined by Leonardo DeVinciLeonardo DeVinci, tend to disperse these vortices. And therefore, to reduce the noise.
Thus, based on work carried out by students at the University of Maryland (United States), the researchers constructed such a 3D aerial screw model to simulate the flow ofairair around the rotor while the drone hovers in the air. They were able to predict the vitessevitesse and the pressionpression of the air flow around the propeller. And from there, estimate the level of noise produced.
Leonardo da Vinci’s aerial screw to the aid of drones
Result: to portanceportance also — since there is no question here of modifying the technical performance of the drone –, Leonardo da Vinci’s screw-shaped propeller makes much less noise than the current blade system. The researchers plan to reproduce their tests on larger drone models that fly at higher speeds. They are not sure that Leonardo da Vinci’s aerial screw is the most suitable for these cases. But they confirm that for applicationsapplications where noise reduction is more important than aerodynamic efficiency, this solution should be considered.
Finally a drone inspired by the aerial screws imagined by Leonardo da Vinci!
A team of engineers from Maryland brought to life Leonardo da Vinci’s crazy aerial screw project designed at the end of the 15th centurye century.
Article from Sylvain BigetSylvain Biget published on 05/02/2022
There is drone and drone… The one designed by the team ofUniversity of Maryland in the United States, is very particular with its helical propellers. They recall the aerial screw imagined by Leonardo da Vinci at the end of the 15th century.e century. And for good reason ! They are totally inspired by it. While they were skeptical at first, it was with surprise that the researchers were able to take off and evolve theaéronefaéronef powered by its four rotors turning these screw-shaped propellers. The scientists were able to present their results at the conference Transformative Vertical Flight 2022 in San Jose, California (United States) recently.
We are far from the experiments of the Renaissance. Instead of boisboisfrom the canvas of linlin and leather is leatheraluminiumaluminium a you plasticplastic which was used to design this drone with its particular appearance. It is also the modelizationmodelization computer science which made it possible to optimize the design of the propellers to verify their aerodynamic behavior.
Towards an aerial screw flying taxi?
The researchers also agreed that the quadcopter format with its four rotors which ensure flight stability, is the only aircraft architecture that can exploit this helical form of propellers. After these chip jumps in the form of test flights, the researchers consider that their technology rescaled to human scale could make it possible to transport a person without difficulty. Apart from the fact of having been able to exploit an invention dating from the end of the 1480s, the researchers do not explain whether the use of these screw propellers makes it possible to optimize the performance during the flight of the aircraft.
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