Numerical Simulation of Helicopter Blade Bullet Penetration in Maneuvering State

Abstract

The study on the impact damage of helicopter rotor blade under maneuvering condition is of important significance. Based on the rotor blade of a certain type of machine, a numerical simulation method of projectile attack on the rotor blade under the condition of maneuvering is introduced. The full-scale finite element model of a certain rotor blade is adopted to perform the projectile attack numerical simulation. The impact of tension, wave moment force and swing moment force on projectile attack are considered ahead. The profile characteristics of the rotor blade are calculated by using the Fortran program and VABS software. The load analysis model of elastic blade structure is established, and the CAMRIDII software is used to calculate the blade load in the state of mobility. On this basis, NASTRAN software is used to conduct the transient analysis on the full-size finite element model of the blade, and the pre-stress state of the blade under load is gained. The DYTRAN software is used to simulate the damage caused by the blade bullet penetration based on the adaptive contact method. The results show that the damage degree of the blade is non-linear with the impact velocity, the surrounding structure beside the bulleting point will also be damaged when the projectile hits. The stiffness matching between the structural parts should be considered in the design of the anti-hit impeller to achieve the best impact energy absorption effect and the minimum damage area.

Keywords

• helicopter
• rotor blade
• composite
• bullet penetration
• damage
• load