Identification of test modal parameter of nuclear power plant boiling water reactor based on time domain method

Aiming at modal parameter identification problems of the large-scale structure, on the base of obtained random response vibration signals from the structure, using test modal parameter identification methods in time domain, and combining random decrement technique with STD method, Pre-processing random vibration response signals with random decrement TD method technique, and then using Sto identify the modal parameters of structure, with a view to improving the accuracy of parameter identification. The method is applied to a boiling water reactor´s modal parameter identification, obtained satisfactory results.