基于铰接连杆的背撑式涡扇发动机减隔振分析  

Analysis of Vibration Reduction and Isolation of Back-Supported Turbofan Engine Based on Articulated Link

作　　者：孙伟 董立君 张睿 鲍君波 王钢林 Sun Wei;Dong Lijun;Zhang Rui;Bao Junbo;Wang Ganglin(Chinese Aeronautical Establishment,Beijing 100089,China)

机构地区：[1]中国航空研究院,北京100089

出　　处：《航空科学技术》2022年第8期32-40,共9页Aeronautical Science & Technology

摘　　要：针对翼身融合布局背撑式发动机安装方式带来的发动机减振问题,本文对涡扇发动机铰接连杆安装的隔振与减振原理进行了理论和仿真分析。研究了三连杆铰接安装节的侧向刚度非线性特性。考虑铰链连杆的间隙连接,通过理论分析和有限元模拟对铰链摩擦阻尼矩进行了预测。进一步对背撑发动机安装系统的振动模态进行了有限元模拟,得到了发动机安装系统的主要振动耦合模态。结果表明,铰接连杆安装耦合了发动机轴向滚转与侧向平移自由度,通过低的侧向刚度实现发动机侧向隔振,同时铰链高的摩擦阻尼矩实现了系统的减振。本文的研究对涡扇发动机背撑式安装的减振分析提供了技术方法。Aiming at the engine vibration problem caused by the installation method of the back-supported engine for blend-wing-body configuration,theoretical and simulation analysis of the vibration reduction and isolation principle for turbofan engine articulated link installation are carried out.The nonlinear characteristics of lateral stiffness of the mounting bracket with three hinged rods are studied.For the gap mechanical connection of articulated link,the dry friction damping moment of the hinge is predicted through theoretical analysis and finite element(FE)simulation.Further,the vibration mode of the back-supported engine mounting system is simulated by the FEM,and the lowfrequency coupled vibration modes of the engine mounting system is obtained.The research results show that the articulated link installation couples the axial rotational and lateral translation freedoms of the engine,which realizes the lateral vibration isolation through low lateral stiffness.Meanwhile,the high friction damping moment of the hinge realizes the vibration reduction of the system.

关 键 词：铰接连杆 刚度非线性 摩擦阻尼 减隔振 

分 类 号：O328[理学—一般力学与力学基础]