Perhaps one of the most interesting military plans that have been implemented so far can be attributed to drones. Drones with a wingspan of less than 500 mm and a weight of less than 500 grams are considered microUAV. Designing a system that can propel microUAV from an airborne platform could revolutionize future warfare. A new concept has emerged in mass flight, which brings to mind the release of a large number of small birds from an airborne platform, similar to an aircraft carrier in the air.
In this article, first the desired microbird was selected, then the necessary studies and investigations were carried out for the design of the holding chamber and the placement of the number and arrangement of the microbirds, as well as the mechanism that can take the microbirds out of the chamber, and the design of this stage was finalized. In the step after selecting the mother bird, the way of installing the holding chamber to the mother bird was done by selecting the release system. Then the modeling of the holding chamber, pylon and release system along with the mother bird's wing was done in CATIA software. MSC PATRAN/NASTRAN software was used for static analysis and modal analysis. For this purpose, 3D models were first simplified in CATIA software. Next, all parts were entered into the MSC PATRAN software. Defining the properties of used materials, elementing, defining boundary conditions, aerodynamic and inertial loading, checking connections and making necessary adjustments are the next steps of static and modal analysis. Finally, static and modal analyzes are performed in MSC NASTRAN software and the results are read in MSC PATRAN software.
The results of static and modal analysis show that the holding chamber designed with a reliability factor of 5 is able to withstand the forces applied to it. The maximum displacement of the holding chamber under aerodynamic and inertial loading is equal to 3/25× 10-4 meters. Also, by connecting the holding chamber to the wing, the natural frequency of the wing has been greatly reduced.