翼吊发动机吊架结构等效建模及减振特性分析

Equivalent Modeling and the Damping Characteristics Analysis of the Wine-mounted Engine Pylon

为了验证翼吊发动机吊架结构对发动机振动传递的减振效果,必须对其进行相关的结构动力学分析。根据实际发动机吊架结构,采用ANSYS软件建立了吊架结构的等效模型,并对其进行了振动模态分析。在发动机三种典型工况(起飞、巡航、空慢)的实测载荷作用下,分析了吊架结构的减振特性,并研究了吊架结构减振效果与结构动刚度的关系。研究结果表明,发动机吊架结构设计具有较好的减振效果,但由于吊架结构的动刚度随激振力频率变大而增大,其高频减振效果稍有降低。

In order to verify the damping effect of the wing-mounted engine pylon structure,the structural dynamics of the engine pylon must be analyzed.An equivalent model of engine pylon is build by the finite element software ANSYS.The first ten non-zero modals of the pylon are calculated.The damping characteristics of the pylon is analyzed under three typical conditions(takeoff,cruise,flight idle),and the relationship between the damping effect and the dynamic stiffness is researched.The results show that the engine pylon design achieves good damping effect,however,due to the dynamic stiffness of the pylon increases with the exciting force frequency's increment,the high-frequency damping effect is slightly reduced.