舰船纵横摇运动对旋翼瞬态气弹响应影响分析

为了研究舰船运动对舰载直升机旋翼瞬态气弹响应的影响,采用中等变形梁模型处理桨叶弹性变形,有限转角处理桨叶绕桨轴和铰的转动及舰船的横摇和纵摇运动,采用Hamilton原理建立了带有舰船运动的舰面旋翼瞬态气弹响应计算模型。通过与国外的试验值和计算值对比验证了本文计算方法的正确性,得到以下结论:(1)舰船的横摇运动对桨尖负向最大位移影响较小;(2)舰船的纵摇运动影响则较显著,随纵摇周期的减小和桨毂离舰船质心纵向距离的增加,桨尖最大负向位移增加显著,纵摇相位影响较为明显;(3)舰船与旋翼的气动和惯性耦合对旋翼瞬态气弹响应的非线性影响非常明显,计算中需计入两者共同的影响。

Influences of Pitch or Roll of Ship on Transient Areoelastic Response of Rotor Blade

To investigate the influences of the motions of ship on shipboard helicopter rotor transient aeroelastic response,the moderate deflection beam model was adopted to deal with the elastic deflections of blade and finite rotations were used to simulate rigid rotations of blade about hinges and rotor axis.Pitch and roll motions of ship were included in the model.Computational results of this paper are in good agreement with test data and other work's results.The results show:(1)ship's roll motion has little influence on maximum negative flapping displacement of blade tip;(2)ship's pitch motion has noticeable influence on maximum negative displacement of blade tip and the parameters-distance from rotor hub to center of ship mass,period and phase of pitch motion of ship have distinct influence;(3)aerodynamic and inertial coupling between ship and rotor have distinct nonlinear influence on transient aeroelastic response and both factors should be included in computational model.