【摘要】 针对现代翼吊式机翼发动机系统的特点,考虑发动机陀螺效应对系统结构动力学特性的影响,建立了基于梁振动理论的机翼弯扭颤振方程;分析了陀螺效应对系统颤振特性的影响规律。结果表明:不考虑发动机吊挂刚度影响时,陀螺效应不影响系统弯扭颤振发生机理,系统颤振速度和颤振频率随着发动机转速的提高而增大;转子陀螺效应对机翼弯扭颤振特性的影响可等效为系统阻尼,且该等效阻尼亦随着发动机转速的提高而增大。更多还原

【Abstract】 Bending-torsional flutter equations of a wing-engine system have been derived,taking into account of the gyroscopic effects of the engine rotor on the wing structure.The connection between the wing and the engine was assumed to be stiff in the equation.Flutter characteristics of the wing with gyroscopic effect was analyzed.The results showed that,with the stiffness of the pylon ignored,the gyroscopic moment raised the flutter speed and flutter frequency of the system,whilst it didn′t affect the inherent flutter mechanism.As a result,the gyroscopic effect on the flutter of the wing-engine system could be effectively modeled as a system damping,and the equivalent damping ratio rose with the rotational speed of the engine.更多还原