基于弹性起落架的直升机系留载荷计算

根据舰载直升机舰面系留时的受力特点，以弹性起落架的垂向变形为变量，根据虚位移原理建立了直升机在摇荡舰面系留的动力学分析模型。运用牛顿迭代法对横摇、纵摇、有风以及无风情况下系留索具载荷进行了计算，发现横摇角较大时载荷主要分布于主起落架系留索上，且风载的影响并不能忽略。分析了轮胎刚度对系留索载荷的影响，结果表明，起落架轮胎刚度由300N／mm增加至800N／ram时，最大张力减小了7．43％，说明增加轮胎刚度能有效提高直升机系留的安全性。

Calculation of Mooring Tension of the Ship-based Helicopter with Elastic Landing Gear

According to analyzing the force situation of the ship-based helicopter moored on the ship, a equation set of vertical deformation of landing gear based on virtual work principle was derived. Then, the mooring tension was calculated by deformation of landing gear. Newton iterative method was used to solve the equation set. It was found that the mooring ten- sion were mainly distributed to main landing gear＇ s cable when roll amplitude were bigger than pitch amplitude and wind load couldn＇ t be ignored. Finally, the iafluence of tyre＇ s rigidity was analyzed. The results showed that the biggest tension decreased 7.43% when the tyre＇ s rigidity increased from 300 N/mm to 800 N/mm tyre＇ s. That was to say it could improved the safety of the moored helicopter.