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水上飞机在着水过程中,龙骨梁是主承力结构。龙骨梁尺寸的设计非常重要,在规范规定的严重工况基础上,依据结构形式及设计经验增加多个设计工况;在没有完全适用的非矩形四边形薄板稳定性工程计算方法时,为控制龙骨梁腹板重量,利用nastran软件中的屈曲模块进行计算并确定腹板的厚度,从而达到减重的目的。整个计算是基于飞机在着水中处于动平衡状态,从而求解飞机的运动方程得到每个节点的载荷,并在此基础上利用惯性释放进行全机平衡求解,并根据全机平衡求解得到的载荷以力的边界条件的形式施加到细节模型。
Seaplane in the water process, the keel beam is the main bearing structure. The design of the keel beam size is very important. Based on the severe working conditions specified in the code, multiple design conditions are added according to the structure and design experience. In the absence of fully applicable non-rectangular quadrangular plate stability engineering calculation method, Beam web weight is calculated using the buckling module in the nastran software and the web thickness is determined to achieve weight loss. The whole calculation is based on that the airplane is in dynamic equilibrium in the water, so as to solve the equation of motion of the airplane and obtain the load of each node. Based on this, the whole machine equilibrium is solved by using the inertial release and the obtained load The form of force boundary conditions is applied to the detail model.