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燃料组件的结构模态频率和振型反映了其自身结构的固有特性,其结构的损坏会降低燃料组件工作的可靠性,是出现工程事故的主要原因之一。利用单点激振多点输出(SIMO)试验模态方法,并基于LMS模态分析软件,对某型号燃料组件进行了锤击法模态试验。以单激振力为输入信号,多个加速度传感器的加速度信号为输出响应,获得了该燃料组件的各阶模态参数和振型。
The structure modal frequencies and modes of the fuel assemblies reflect the inherent characteristics of their own structure. The structural damage will reduce the reliability of the fuel assemblies, which is one of the main causes of engineering accidents. A single-point excited multi-point output (SIMO) test modal method was used. Based on the LMS modal analysis software, a certain type of fuel assembly was tested by hammering mode. Taking the single excitation force as the input signal, the acceleration signals of several accelerometers are output responses, and the modal parameters and mode shapes of the fuel assemblies are obtained.