로켓 기반 UAV의 자세제어 시스템 검증을 위한 비행 환경 모사 HIL 시험

Abstract

Rocket-based UAVs utilize rocket propulsion to extend the range over which fixed-wing aircraft can fly and increase airtime. Rocket-based UAVs need to make a maneuverable flight with a posture control system to create a ballistic trajectory to the desired target. Developing an Attitude Control System(ACS) that allows such maneuvering flight is necessary. Similarly, since UAVs are flying devices, when flying outdoors, they are exposed to noise like wind and various environments like cargo. Therefore, there is a demand for the development and flight testing of UAVs for controllers operating in these environments. Flying devices, including rocket-based UAVs, need to ensure the robustness of their components, as some system failures can lead to crashes throughout the airplane. HIL systems are well suited for these tests because they can simulate hazardous environments. However, there are limitations in simulating the aerodynamic environment with a computer model, so it is not as precise as a wind tunnel device. Therefore, in this study, the robustness of the ACS was verified by constructing a device that can perform HIL tests using a wind tunnel device for a rocket-based UAV. Since rocket-based UAVs are not complete and are under development, some parts not involved in the UAV's attitude control system have been replaced with dummy weights to conduct HIL tests. In addition, the HIL components based on the flight test system built in previous studies. This paper introduces a flight test system's components and shows how to build the HIL test bench. Determine the flight environment simulated by wind tunnel and the flight test system using Flight simulation of the rocket-based UAV. The body of a rocket-based UAV generates a lift angle of attack of 10 degrees. It holds to an attitude control device when flying at a speed of 10 m/s in a standard atmospheric density environment of 25°C and 1 atmosphere of pressure. As a result of the test, it was found that the posture control device performed the set role robustly. We also found that it can help increase rocket-based UAVs' controller performance in the same environment.