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将吊篮与压力容器视为包含粘性流体的有限长同心圆柱壳体结构。从圆柱壳的运动控制微分方程和流体的 N- S方程出发 ,在流体不可压缩粘性假设下 ,导出吊篮结构自由振动时 ,流体作用于壳体结构上的附加质量、附加阻尼矩阵。再结合固体有限元技术 ,建立吊篮结构的流固耦合振动的有限元模型。用此模型对吊篮结构在静水中的固有振动特性进行分析 ,计算结果与试验实测结果的比较表明 ,本文方法能较好地满足工程分析要求
The basket and pressure vessel are considered as finite length concentric cylindrical shell structures containing viscous fluids. Starting from the motion control differential equations of the cylindrical shell and the fluid N-S equation, the additional mass of the fluid acting on the shell structure and the additional damping matrix are deduced under the assumption of incompressible viscous fluid. Combined with the solid finite element method, the finite element model of the fluid-structure interaction vibration of the suspended basket structure is established. The inherent vibration characteristics of the basket structure in still water are analyzed with this model. The comparison between the calculated results and the experimental results shows that the proposed method can better meet the requirements of engineering analysis