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为了研究翼吊发动机安装结构隔振特性并优化其隔振器设计,建立了发动机安装节-吊架-机翼结构理论分析及有限元模型.利用有限元方法进行了模态验证并分析了安装结构的隔振特性.进行发动机3种典型工况下的结构动响应分析确定了振动传递的主路径.基于振动传递路径法研究了隔振器参数和安装位置对安装系统隔振性能的影响规律.结果表明:振动载荷经安装结构后低压转子转频和高压转子转频峰值响应分别降低22.03%和14.65%.低压转子转频振动传递主路径为发动机-前安装节-吊架-机翼,高压转子转频为发动机-后安装节-上连杆-机翼.通过合理设置隔振器位置可以使安装系统隔振率达到50.41%,隔振器的频率比为5和阻尼比为0.25时安装系统隔振率可达70.67%.为了优化整个发动机安装系统的隔振效果,设计隔振器时必须选取合适的安装位置和参数.
In order to study the vibration isolation characteristics of the wing-mounted engine mounting structure and optimize its vibration isolator design, the theoretical analysis and finite element model of the engine mounting section-hanger-wing structure are established. The modal verification and analysis of the installation Structure vibration isolation characteristics of the engine under three typical conditions of the dynamic response of the vibration analysis to determine the main path of vibration based on the vibration transfer path method to study the vibration isolation system parameters and installation location of the vibration isolation performance of the law The results show that the vibration response is reduced by 22.03% and 14.65% respectively after the vibration load is mounted on the low frequency rotor and the high frequency rotor. The main path of the low frequency rotor is the engine - front mounting section - hanger - High-voltage rotor frequency conversion for the engine - after the installation section - on the connecting rod - wing.By setting the position of the vibration isolator can make the installation system vibration isolation rate of 50.41%, the frequency ratio of the vibration isolator is 5 and the damping ratio is 0.25 Installation system vibration isolation rate up to 70.67% .In order to optimize the vibration isolation effect of the entire engine mounting system, the design of the vibration isolator must select the appropriate installation location and parameters.