翼吊发动机转子系统在大气紊流下的响应分析

针对翼吊发动机高空工作时受大气紊流影响这一现象,基于机翼气动弹性力学和转子动力学理论, 采用Dryden紊流模型作为大气速度模型,建立了翼吊发动机转子系统在大气紊流下的动力学模型,运用虚拟激励法对模型进行数值计算.结果表明:转子系统中各转盘站的位移响应功率谱密度变化趋势与大气紊流速度功率谱密度变化趋势基本相似,但在固有频率处会出现位移响应强度峰值;当角频率大于100 rad/s时,大气紊流引起的位移响应强度随着角频率的增大而减小,并且不可忽视转子系统本身特性对位移响应强度的影响. 

Response Analysis of Wing-Mounted Engine Rotor System under Atmospheric Turbulence

In order to study the phenomenon that wing-mounted engines working at high altitudes could be affected by the atmospheric turbulence, a dynamic model of wing-mounted engine rotor system under atmospheric turbulence was established using the theories of wing aeroelastics and rotor dynamics and adopting the Dryden turbulence model as the atmospheric speed model. To solve the dynamic model, the pseudo-excitation method was used for numerical calculation. The results show that the power spectral density (PSD) of the displacement response at each turntables station in the rotor system has almost a similar variation trend to the PSD of the atmospheric turbulence speed, but the displacement response intensity peak occurs at the natural frequency. The displacement response intensity caused by atmospheric turbulence decreases with the angular frequency increasing when the angular frequency is larger than 100 rad/s, and the effect of rotor system characteristics on the displacement response intensity cannot be neglected.