FLUID-STRUCTURE INTERACTED VIBRATION OF AN ELEMENT MODEL OF PARALLEL-PLATE FUEL ASSEMBLY

Flow-induced vibration and hydroelastic instability of parallel-plate assemblies are studied theoretically.A model of multi-parallel-beams joined with a single-beam is adopted in the theoretical analysis of the natural vibration characteristics of the parallel-plate assembly.In the theoretical calculation and analysis on the wet natural modes,the dry-modal functions are used as trial functions to solve the complex mode equation,utilizing the extended Galerkin method.Fluid-structure interaction on the parallel-plate assemblies is of complex-modal characteristics.Some regular results are drawn from theoretical analysis and calculations and it is beneficial to the design and safety of fuel elements in nuclear reactors.