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选取齿轮传动涡扇发动机低压转子为研究对象,以结构效率评估参数量化其动力学特性.通过建立低压转子简化模型,对低压转子关键结构参数(即支承方案、支点支承刚度)对其动力学特性的影响规律进行了研究,阐明了低压转子结构参数与其动力学特性的关系,并对其支承方案及支承刚度进行了优选设计.当低压转子支承方案为1-0-1,两支点支承刚度分别为5.84×10~7 N/m和5.90×10~7 N/m时,转子动力学性能较优,此时转子角向抗变形能力较好,前两阶临界转速分布满足共振裕度设计要求,且分布于小的转速区间内.
The low-pressure rotor of gear-driven turbofan engine is selected as the research object, and the dynamic characteristics of the low-pressure rotor are quantified by the structural efficiency evaluation parameters.By establishing a simplified model of low-pressure rotor, the key structural parameters of the low- The relationship between the structural parameters of low-pressure rotor and its dynamic characteristics was expounded, and the optimal design of the bearing scheme and the bearing stiffness was designed.When the low-pressure rotor supporting scheme is 1-0-1, the bearing stiffness of the two points respectively The rotor dynamic performance is better, the rotor angular deformation resistance is better, the first two critical speed distributions meet the design requirements of the resonance margin , And distributed in a small speed range.