摘要
由于材料、工作环境等因素影响,以航空发动机为代表的旋转机械在工作过程中可能会产生裂纹故障,常见的裂纹类型为呼吸裂纹。为分析该故障对轴系振动特性的影响,基于某型双转子涡扇航空发动机,建立了包含风扇和多个轮盘在内的双转子—支承动力学数值仿真模型,使用Newmark-β法分别对不同裂纹相对深度和不同转速下的系统工况进行了数值仿真求解。结果发现:随着裂纹逐渐加深,转子高频分量愈加明显,系统稳定性下降;随着转速升高,系统出现了2X,3X分量,工频分量在一阶临界转速前后先增大后减小,轴心轨迹由不规则形状逐渐转变为圆形。
Due to the influence of materials,working environment and other factors,rotating machinery represented by aero-engines may have crack faults during operation.The common crack type is respiratory crack.In order to analyze the influence of the fault on the vibration characteristics of the shafting,based on a certain type of dual-rotor turbofan aero-engine,a dual-rotor-support dynamics numerical simulation model including a fan and multiple disks is established.The Newmark-βmethod is used to numerically simulate the system operating conditions at different crack relative depths and different speeds.It is found that with the gradual deepening of the crack,the high-frequency component of the rotor become more obvious and the system stability decrease.With the increase of rotational speed,2X and 3X components appear in the system.The power frequency component increases first and then decreases before and after the first-order critical speed,and the axis trajectory gradually changes from irregular shape to circle.
作者
孙智博
史铁林
段暕
Sun Zhibo;Shi Tielin;Duan Jian(School of Mechanical and Science Engineering,Huazhong University of Science and Technology,Wuhan 430074,China;不详)
出处
《工具技术》
北大核心
2024年第4期59-64,共6页
Tool Engineering
基金
国家重点研发计划(2020YFB1709801)
国家自然科学基金(52205103)。
关键词
多盘
双转子
仿真
呼吸裂纹
振动特性
multi-disk
dual-rotor
simulation
breathing crack
vibration characteristics
