SFD用于某导弹发动机的改型研究

以某导弹发动机双转子系统为研究对象，将弹支挤压油膜阻尼器（简称ＳＦＤ）用于内转子进行了动力特性分析。应用传递矩阵和线性迭代方法，分别计算了发动机用与不用ＳＦＤ的转子系统的临界转速、不平衡响应和外传力。结果表明：弹支挤压油膜阻尼器大大减小了转子振动的振幅和外传力。特别是该发动机的工作转速为２５０００ｒ／ｍｉｎ，不用弹支挤压油膜阻尼器时，其二阶临界转速为２２６００ｒ／ｍｉｎ，与工作转速相当接近，用了我们设计的弹支挤压油膜阻尼器后，二阶临界转速降低到１５４００ｒ／ｍｉｎ，显然，发动机工作时的振动性能会大大改善。

MODIFICATION OF AN MISSILE ENGINE WITH SFD

Dynamic characteristics of internal rotor-bearing system in a twin-spool engine for missle have been improved with Squeeze Film Damper (SFD).The critical speeds,unbalance responses and tramsmitted forces of the engine with or without the SFD have been calculated with the aid of the linear transfer matrix iterative method.The results show that the squeeze film damper with a spring retainer greatly attenuates the vibration amplitudes and transmitted forces of the rotor system.The flexibly mounted squeeze film dampers of the engine decrease the second critical speed from 25000 r/min to 15400 r/min.