Comparative Study on Method of Inversion Analysis of Structure Parameter in Nuclear Power Pipeline System Using Seismic Response

The feasibility and difference of using seismic response to invert the structure parameters of the pipeline were studied when the ratio of seismic response to seismic excitation and the vibration control equation error were taken as the target eigenvalues in this paper. The iterative mathematical model which could be shared by the two methods was derived, and then the structure parameters in finite element model of pipeline were identified by using the seismic response. The results show that the inversion results of the two methods have similar accuracy under certain conditions. The method based on the ratio of seismic response to seismic excitation has higher robustness, and is suitable to use displacement response. The method based on the vibration control equation error has lower dependence on the initial estimation of the updated parameters, and is suitable to use acceleration response.