by According to a new study, a kind of helicopter design, which is first intended by the Italian polymath Leonardo da Vinci from the Renaissance era, could help develop quieter and more hidden modern drones.
Drones create a characteristic high sums while their propellers cut through the air. Since these remote -controlled vehicles are used in more detail for delivery, photography, emergency reaction and warfare in the areas of package, the noise pollution they produced is only set in such a way that they increase.
A new study by John’s Hopkins University suggests that a device invented by Leonardo da Vinci could absorb the key to calmer drone technology more than 500 years ago.
Maybe the most famous for his pictures like that Mona Lisa And The last sacramentLeonardo was also an engineer and architect, who designed plausible aircraft for centuries before the air age, including a prototype phubaucker.
The Leonardo air screw designed in the 15th century is one of the earliest known design for a lifting rotor.
Nevertheless, according to Rajat Mittal, author of the new study, the aerodynamic and aeroacoustic performance has only received limited scientific attention.
In the research to be considered, Dr. Mittal and his team the aerodynamic forces and sound emissions of a modernized Leonardo air screw design.
“Since Vinci’s visionary air screw – a kind of forerunner of the modern helicopter – has inspired our investigation,” he says.
“The idea was to bring historical inspiration and modern calculation together to reinterpret a quieter modern drone,” said the JHU machine engineer.
The moles produced by modern drones are on air vertebrae to trace the tip of the propellers that cross with their flat, angled blades.
The researchers theorized that propellers made the design of Leonardo similar to a screw shape and a single blade, these air vertebrae can spread around the sound and mute the sound.
Scientists carried out computer simulations and evaluated the elevator, mechanical performance and acoustic emissions from such a design under different air flow conditions.
They compared the results with those of a typical two -leaf rotor that creates a similar buoyancy.
Scientists found that the modernized Leonardo design produced less sound intensity for the same elevator.
“The propeller shows a significantly lower mechanical power consumption and acoustic intensity per elevator,” the researchers wrote in the study.
They found that the spiral geometry of the Leonardo air screw represents the interaction between rotor leaf and air vertebrae and thereby the noise.
“The continuous single-blade design of the screw screw allows Blade-Vortex interaction noise, an important contribution to the rotor aeroacustics,” wrote scientist.
According to researchers, these results underline the potential advantages of unconventional rotor design for noise -sensitive applications.
“Future work could examine geometric variations, e.g. increasing the number of curves,” she said.
Scientists hope to further investigate the structural integrity and stability of the Leonardo design before being developed into viable rotorcraft concepts.
