Elijah Ang, Jieli, Daryl Leo, Jun Kang Tan, Jonathan Tay, Yongdong Cui, Bing Feng Ng

DOI Number: N/A

Conference number: IFASD-2024-108

Body Freedom Flutter (BFF) has always been known to be a potentially catastrophic event for any flying aircraft. BFF is a dynamic instability that results from the strong coupling
between rigid-body and elastic modes of the aircraft. Here, we demonstrate how different parameters affect the speed and frequency at which BFF occurs using a wind tunnel with a test rig. The test rig was designed to allow the degrees of freedom needed for BFF to occur, which is then fabricated using 3D printing to optimise weight savings. Different flying wing profiles are considered and the UAV is subject to the different parameter variations. The mount allowed freedom to the wing profile in both the pitch and plunge movement. It is found that BFF characteristics are affected by the additional wing tip weights and spanwise weight location. These parameters directly affect the centre-of-gravity for the wing profile, its wing inertia, and its structural properties. The results and trends obtained can be used to further understand the BFF phenomenon.

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In Categories: 1. IFASD 2024, 1.Events, Wind Tunnel Testing and Flight Testing
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