论文部分内容阅读
考虑齿轮传动风扇发动机(GTF)风扇转子与低压转子的耦合关系,提出了转子系统简化整体模型,针对该模型给出了GTF发动机转子系统的临界转速计算方法.揭示了整体模型与单转子模型临界转速计算结果的差异,以及典型力学特征参数对GTF转子系统临界转速与模态特征的影响.计算结果表明:相比考虑耦合关系的整体模型,将风扇转子与低压转子分开计算会导致转子系统固有频率值偏移及部分临界转速丢失;齿轮箱安装支承刚度增大会使得系统临界转速上升,保持安装刚度大小在106 N/m量级以下可使系统动力特性较优;传扭轴段刚度与齿轮径向啮合刚度对系统动力特性影响较小.
Considering the coupling relationship between fan rotor and low-pressure rotor of fan-driven fan engine (GTF), a simplified overall model of rotor system is proposed, and the calculation method of critical speed for GTF engine rotor system is given.It is revealed that the whole model and single rotor model are critical The difference between the calculation results of the rotating speed and the influence of the typical mechanical parameters on the critical speed and the modal characteristics of the GTF rotor system.The calculated results show that the rotor system is inherently separated from the low-pressure rotor by considering the overall model considering the coupling relationship Frequency shift and partial critical speed loss. Increasing the rigidity of the gearbox mounting support will increase the critical speed of the system, keeping the installation stiffness less than 106 N / m can make the system better dynamic performance. Radial meshing stiffness has little effect on the system dynamic characteristics.