平板型复合材料格栅结构载荷重构研究Ⅰ:前向响应模型

Study of load reconstruction on an advanced composite grids(AGS) plate Ⅰ:Forward response model

先进复合材料格栅结构(AGS)在航空、航天结构工程中有着广泛的应用前景。本文作者针对低速冲击载荷作用下先进复合材料格栅结构的载荷重构进行了研究。本文中研究了平板型复合材料格栅结构在横向低速冲击载荷作用下的前向响应近似模型。考虑AGS板蒙皮/肋的弯剪耦合效应和截面偏心距e,对平板型复合材料格栅结构的等效刚度模型进行了改进。基于改进的等效刚度模型和非对称Mindlin板理论,建立了平板型格栅结构的前向响应近似模型及其状态空间表达式,应用傅立叶展开求解了低速横向冲击载荷作用下的结构响应,并通过数值试验验证了该方法的实用性与可靠性。该部分研究将为平板型复合材料格栅结构的载荷重构Ⅱ:逆向重构的研究提供前提条件和理论基础。

Advanced composite grids structures （AGS） have found many applications in the aerospace structure engineering. A load reconstruction method was investigated to estimate low velocity impact load on an AGS plate by the authors. In the part, an approximate method was presented to calculate transverse low velocity impact responses on an AGS plate. Considering the rib section eccentricity e and stretch blending coupling effect, an AGS plate equivalent stiffness model was improved. Based on the improved model and the unsymmetrical Mindlin plate theory, an AGS forward response approximate model was built with state-space equations. Fourier series expansion was utilized to solve the dynamic equations. The practicability of the presented method in this part was examined by numerical experiments and good results were obtained. The study would provide a theoretical basis for the load reconstruction on AGS plate Ⅰ： Inverse solver.