| Popis: |
Crashworthiness studies the safety qualification of a vehicle (both airborne and road transports) to protect its occupants during an impact. For an aircraft, specific crashworthiness criteria like deformation pattern of the structure, absorbed kinetic energy profile, and acceleration responses experienced by the components and human body models must be met before it receives the transport certification. Therefore, in recent times, crashworthiness has emerged as a crucial field of study during the early design stages of aircraft along with other key parameters like weight reduction, load factor, and fatigue life estimation, etc. During the investigations of fuselage section crashworthiness, the solutions are mostly presented based on a perfect vertical impact without considering any effect of roll and pitch of the fuselage. However, in a practical situation, an abrupt event can be introduced with uncertain impact phenomena. Therefore, in this current research, a civil aircraft fuselage section with an onboard auxiliary fuel tank is studied based on five different uncertain impacts considering both different roll and pitch angles. A commercial explicit dynamic code Ansys Autodyn is adopted to investigate the virtual drop tests. Then the numerical outcomes are compared based on the seat trail acceleration responses, kinetic energy absorption of the components, and plastic deformation of the structure due to the investigated uncertain impacts. It is found that a minor change in roll and pitch angle has a significant effect on the acceleration responses of the accelerometers and the plastic deformation pattern of the fuselage section. |
