带止口法兰连接结构刚度特性对结构振动影响

对带有止口的法兰连接结构刚度特性进行了数值仿真研究。使用有限元软件ANSYS分析了带有止口的法兰连接结构的迟滞特性。通过对止口接触面的变形-滑移机理分析,使用一个詹金斯单元和一个弹簧单元并联模拟法兰的一个扇区,并基于法兰弯曲变形时每个扇区的不同状态建立了整个法兰结构的弯曲刚度简化模型,并对该简化模型进行了仿真,该简化模型能够较准确地模拟带止口法兰连接结构的刚度特性。基于简化模型和梁单元建立了简化转子结构模型,分析了带有止口的法兰连接结构对转子稳态动力学响应的影响。结果表明带有止口的法兰连接结构的迟滞特性能够影响峰值频率,随着止口过盈量的增加，响应峰值显著降低,具有较好的振动抑制效果。 

Stiffness characteristics of flange joint with a snap and its influence on structure vibration

The stiffness characteristics of flange joint with a snap were studied by numerical simulation. The hysteresis characteristic of the flange joint with a snap was analyzed using ANSYS. Based on the analysis of the deformation and sliding of the snap contact surface, a Jenkins friction element was used in parallel with a spring element to simulate a section of the flange joint, and the simplified model of the bending stiffness of the whole flange structure was established according to different states of each section during the bending deformation of the flange. The simplified model can be utilized to simulate the stiffness characteristics of the flange joint with a snap accurately. The rotor model was built based on the stiffness simplified model and beam element, and the influence of the flange joint with a snap on the steady-state response of the rotor was analyzed. The results show that the hysteresis characteristic of the flange joint with a snap can affect the peak frequency and reduce the response peak significantly with the increase of snap interference, producing a good vibration suppression effect.