MALE stands for Medium Altitude Long Endurance. According to the researchers, there are numerous advantages of using 3D printing over other methods of fabrication. Using PLA makes UAVs more eco-friendly, for one thing, and also improves their strength to weight ratio. 3D printing allows designers to densify certain areas, such as the landing gear or nose tip, that will experience greater impact, while compensating by reducing weight elsewhere. The technology also makes it easier to create an aerodynamic design, and saves time, money and effort compared to other manufacturing methods.
Other techniques are sometimes used for manufacturing the body of the drone, such as subtractive manufacturing of Styrofoam or Balsa wood, and while they have their own advantages they also have several disadvantages: a Styrofoam sheet is non-aerodynamic, while constructing a drone out of Balsa wood is “cumbersome as well as time-consuming.” In contrast, 3D printing a fuselage is easy and allows for a great deal of design freedom.
The researchers 3D printed several iterations of the drone before arriving at the final version, which was “aerodynamically stable as well as mechanically robust.” Stress analysis was performed using FEA simulations through an ANSYS tool. They analyzed both nose impact and belly impact.
In the nose impact analysis, the maximum force applied was 25 N and the maximum deformation was 1.09 mm.
“The analysis is oriented in such a manner that the wing berth is taken as fixed support thereas, the motor mount is assumed to have a ramped up force impact on it,” the researchers state. “The feature shows that the maximum deformation would occur at the joint of two different parts which were manufactured separately and then joined together using cyanoacrylate.”
For the belly impact analysis, the maximum force applied was 25 N and the maximum deformation was 1.1435 mm.
“As the fuselage is deemed to land on its belly during the landing approach,” the researchers continue. “Moreover, in any case the first impact would be on the bottom surface only. Considering the purview of the given problem statement, the analysis is shown above where the impacts on grilled bottom and wall surfaces have been shown.”
The researchers conclude that FDM 3D printing technology is an effective way of constructing drones, with excellent build precision and high strength to weight ratio. It allows varied material composition on different parts of the drone, and is overall simple, cost-effective and time-saving.
Authors of the paper include Ankur Dwivedi, Darshit Desai and Deepesh Agarwal.
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