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EMAS의 하중 및 휠 거동 특성에 관한 매개변수 연구
Parametric Study of Load and Wheel Motion Effects in Engineered Material Arresting System (EMAS)
Engineered Material Arresting System (EMAS) is a critical safety installation at the end of a runway toarrest an overrunning aircraft. Key parameters such as vertical load and wheel-EMAS interaction mode significantly influence arresting performance. Since aircraft overrun involves combinations of these parameters, understanding their coupled effect is essential for predicting arresting behavior. This study investigates the combined effects of loads and wheel-EMAS interaction modes, namely rolling, sliding, and combined rolling-sliding, on wheel velocity. A finite element model simulating the wheel’s translation across the EMAS bed was developed using LS-DYNA, a commercial software. The wheel was modeled as a rigid aluminum body, whereas the EMAS bed was represented as a glass foam. The simulation model was defined using comprehensive inputs, including geometry, material models, boundary conditions, and contact parameters, with the initial wheel entry velocity kept constant across all simulations. For each load, the various wheel-EMAS interaction modes were examined. Results indicate that both higher loads and sliding-dominated interaction significantly enhance velocity decay.Among the investigated cases, the greatest velocity decay occurs for pure sliding motion under the highest applied load, where the velocity is reduced by 99.43% of the initial velocity. In contrast, rolling motion under the reference load exhibits the least decay, with only a 29.27% of the initial velocity, while all other cases fall between these two extremes. This trend indicates that sliding-dominated motion dissipates a larger portion of kinetic energy, resultingin greater velocity decay. On the other hand, rolling motion limits energy loss, and the combined rolling-sliding mode exhibits transitional behavior between these two modes. This velocity decay is amplified under higher loads, where the increased normal force enhances energy dissipation. Hence, the combined effect of interaction mode and load is critical for the accurate evaluation and design of EMAS systems.
