堆芯金属反射层组件在空气中动力特性计算与试验研究

Calculation and Experimental Study on Dynamic Characteristics of Core Reflector Assembly in Air

为研究某新型反应堆堆芯金属反射层组件的动力特性,本文以某在建机组堆芯金属反射层组件为研究对象,建立了该组件的有限元模型,计算了其在空气中的动力特性。针对堆芯金属反射层组件结构大、质量重的特点,开发了大冲击力力锤,并在实际组件上进行了试验模态分析。研究结果表明,有限元法计算及试验模态分析获得的堆芯金属反射层组件在空气中的振型相同,固有频率吻合较好。有限元模型可以准确模拟堆芯金属反射层组件的动力特性,可用于后续流致振动响应的计算分析和组件设计过程中动力特性的校核及优化。

In order to study the dynamic characteristics of core reflector assembly inanew type of reactor,the finite element(FE)model of the core reflector assembly of a unit under construction is established,and its dynamic characteristics in air are calculated.Because of the largestructure and heavy weight of thecore reflector assembly,a large impact hammer is developed.The experimental modal analysis is carried out onan actual core reflector assembly.Results show that,the modeshapesof corereflector assembly inairobtainedbycalculation and test are the same and the natural frequencies are in good agreement.The FEmodel can accuratelysimulate dynamic characteristics of the core reflector assembly.Thus,the FE model can beused to analyze the fluid-induced vibration response check and optimize the dynamic characteristics during the design process.