直升机着舰起落架动态响应

Dynamic Response of Landing Gear for Helicopter Deck Landing

舰载直升机着舰过程复杂。与地面降落相比,舰面的不稳定气流使得直升机姿态难以保持,下降的速度更大,且由于直升机通常都是单轮着舰,导致起落架载荷很大。为了研究直升机在不同条件下着舰时起落架的动态响应,建立了机体/起落架/舰船耦合模型,将着舰过程中直升机的运动和舰船的运动联系起来,通过仿真计算得出起落架的动态响应。仿真计算结果表明:直升机着舰质量越大,起落架压缩量和载荷越大;直升机低头着舰会导致前起落架载荷显著增大;直升机着舰下沉速度过大会导致着舰载荷急剧增大,可能会对结构造成破坏。

Deck landing of shipborne helicopters is a complex process.Compared with landing on ground,it is difficult to maintain the attitude of the helicopter due to the unstable airflow on the deck,the speed of descent is greater,and usually lands with a single wheel,hence the load of landing gear is larger.In order to research the dynamic response of the landing gear when the helicopter lands on the ship under different conditions,a coupled model of the fuselage,landing gear and ship is established,which connects the motion of the helicopter and the ship,and the dynamic response of the landing gear is ob⁃tained by simulation.The simulation results indicate that:the larger helicopter mass is,the larger the compression and load of the landing gear are;the helicopter landing with a negative pitch angle will cause the nose landing gear load to increase significantly;too much landing speed will cause the load to increase significantly and may damage the structure.