In the design of vibration isolation system of turboprop engine installation system, many design requirements such as vibration isolation efficiency, vibration mode decoupling and wing flexibility influence and so on must be considered synthetically. A design method of installation system based on elasticity center theory is proposed. Using this method, the design parameters of a certain engine mounting system reduction ratio model are obtained, and the rigid-flexible coupling calculation model is established by combining FEA and Multibody dynamics software, Effect of Flexible Wing on Dynamic Performance of Installation System is studied. The results show that the stiffness ratio of the wing to the shock absorber greatly affects the coupling of the vertical mode and the vertical vibration of the system, and the damping of the wing has a great influence on the resonance response of the high frequency. The optimal stiffness ratio of the mounting system with better vibration damping effect is obtained. A vibration isolation design method of the mounting system considering wing stiffness is proposed.%涡桨发动机安装系统隔振设计需综合考虑安装系统的隔振效率、振型解耦、机翼柔性影响等诸多设计要求,该文提出了基于弹性中心理论的安装系统设计方法,利用该方法获得了某型发动机安装系统缩比模型的设计参数,并联合使用有限元和多体动力学软件建立了其刚柔耦合计算模型,分析了柔性机翼对安装系统动态性能的影响.结果表明:机翼与减振器刚度比对系统的垂向模态和垂向振动耦合影响较大,机翼阻尼对高频共振响应影响较大.进一步获得了安装系统取得较好减振效果时的最佳刚度比,提出了一种考虑机翼刚度的发动机安装系统隔振设计方法.
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