摘要
针对航空发动机转子大量采用的螺栓法兰连接,建立了连接结构的力学模型,定性给出了两段转子在相对弯曲时连接部位弯矩的分段线性参数化模型。应用状态空间理论和数值计算方法对一个含螺栓连接的转子系统进行了数值模拟,研究其模态特性和稳态动力学响应。研究表明,分段线性变化连接刚度对中转速段尤其是二阶临界转速附近的模态和稳态动力学响应产生较大影响,而转子系统在低速段和高速段保持相对稳定的、可线性化的运动。分析了预紧力对转子运动特性的影响,发现预紧力对转子系统运动稳定性影响显著,在一定范围内增大预紧力会使系统不稳定加剧,但会缩短不稳定运动的区间范围。
Bolt joint structures are widely used in the aero-engine rotor systems.The mechanical model of a joint structure was set up and a parametric model for the bilinear moment distribution was given qualitatively.The modal characters and steady responses of the rotor system with bolt joint were investigated,by using the state space theory and numerical simulation.It is shown that the bilinear moment character has influence on modal characters and steady responses at medium rotational speed,especially at the vicinity of second order critical rotational speed,while it keeps steady and can be linearized at lower and higher rotational speeds.It is also found that pre-tightening force has a large influence on the stability of the rotor system.The increasing of pre-tightening force can intensify the instability of the system,but shorten the range of unstable motion.
出处
《振动与冲击》
EI
CSCD
北大核心
2016年第22期10-16,37,共8页
Journal of Vibration and Shock
基金
国家973计划资助项目(2015CB057400)
天津市自然科学基金项目(11JCZDJC25400)
作者简介
刘卓乾 男,硕士生,1990年生
通信作者 曹树谦 男,博士,教授,博士生导师,1964年生E-mail：sqcao@tju.edu.cn
