预连接工艺对壁板动态特性的影响分析

Influence of pre-joining scheme on panel dynamic characteristic

针对预连接对壁板动态性能影响的问题,提出描述壁板预装配后动态性能的刚度评价指标.为了确定预连接分布,将预连接结构等效为多自由度的弹簧-质量系统,建立壁板预连接分布优化模型并提取相应刚度信息,以刚度指标最大为优化目标,应用遗传算法进行求解计算.构建蒙皮-长桁的壁板仿真模型,将不同预连接分布映射至壁板仿真模型上,利用低阶固有频率的变化验证以刚度为指标的优化方法的正确性.设计壁板动态特性测试实验,与不同预连接分布下提取的仿真频率进行比较,证明了壁板仿真模型的有效性.通过仿真与实验,表明刚度指标的有效性,为进一步研究预连接分布对壁板加工性能影响研究奠定基础.

The stiffness evaluation index for the dynamic performance of the pre-assembled panel was proposed aiming at the influence of the pre-joining on panel dynamic characteristic.The pre-joined structure was equivalent to a multiple degrees of freedom spring-mass system.In order to determine the pre-joining schemes,taking the maximum stiffness index as the optimization goal,apre-joining scheme optimization model was presented and solved by the genetic algorithm.Subsequently,a simulation model of a skin-stringer panel with different pre-joining schemes and their corresponding stiffness information were constructed;the low natural frequencies were analyzed to verify the rationality of the proposed index.An experiment of panel dynamic characteristic was designedto compare the simulation frequencies obtained from different pre-joining schemes,which indicated the effectiveness of the simulation model of panel.The simulation and experiment prove the validity of the stiffness index,which lay a foundation for further study on the effect of pre-joining schemes on panel machining properties.