基于模型修正的螺栓连接板结构动力学建模方法

螺栓连接板结构是飞行器结构中应用最为广泛的可拆卸固定结合部之一.该文针对螺栓连接板结构的动力学建模展开研究:基于薄层单元理论建立螺栓连接板结构的动力学等效模型;采用固有频率误差和模态置信准则残差的加权和作为修正薄层单元材料本构参数的目标函数,并利用水循环算法对待修正参数进行全局修正;以一个双边固支五螺栓搭接板结构的动力...

STRUCTURAL DYNAMIC MODELING METHOD OF BOLTED JOINT PLATES BASED ON MODEL UPDATING

The bolted joint plate structure is one of the most widely used detachable fixed joints in aircraft structures. We study the dynamic modeling of bolted-joint plates and establish the dynamic equivalent model of bolted-joint plates based on the thin-layer element theory. The weighted sum of the natural frequency error and the modal confidence criterion residual are used as the objective functions. We propose to use the water cycle algorithm to globally modify the material parameters of the thin-layer elements. By an example of a clamped-clamped five-bolt lap plate, we verify the feasibility and robustness of the proposed dynamic modeling method. The results show that the established dynamic prediction model of the bolted joint plate structure can accurately characterize its dynamic characteristics and reduces the effect of the measurement noise compared to the current dynamic modeling methods.