An Extended Inertia Relief Technique for Efficient Simulation of Aircraft Hard-Landing

초록

During takeoff and landing of aircraft, various types of accidents may happen. Those include runway over-run, excursions off the sides of runways on landing, landing gear failures, controlled flight into terrain, and hard-landing. Among those, hard-landing is the most common type of accident. Even though hard-landing does not usually result in fatalities, it may cause aircraft damage which leads to a fatal accident during the next flight. Therefore, airframe structures should be closely investigated, once hard-landing occurs. Due to the reason, rational hard-landing detection procedure is essential to guarantee the structural integrity of airplane. In the line of thought, an extended inertia relief technique is proposed, and the proposed technique is applied to aircraft landing simulation, aiming to develop a rational and practical hard-landing monitoring procedure as a forthcoming research effort. In the paper, aircraft landing simulation is composed of two stages. In the first stage, inertia and impact landing forces are extracted from the landing simulation of rigid body. In the second stage, the obtained inertia and landing forces are applied to aircraft structural model by using the proposed extended inertia relief technique in order to determine whether severe structural loading occurs and to detect the possible damage location. To investigate the validity of proposed method, hard-landing simulations are carried out for aircraft beam model. The results obtained from the proposed method are compared with those from the full nonlinear structural dynamic analysis. Through the comparison, usefulness of the proposed method in landing simulation is verified.