Open AccessDynamic Characteristics Analysis of Cylinders Bundle Coupling System Under Axial Flow
Author(s) -
Yafeng Shu,
Jianjun Wu,
Yi Yang,
Weiming Liu,
Kei-wei Tao
Publication year - 2021
Publication title -
mechanika
Language(s) - English
Resource type - Journals
eISSN - 2029-6983
pISSN - 1392-1207
DOI - 10.5755/j02.mech.25101
Subject(s) - vortex induced vibration , vibration , bundle , coupling (piping) , flow (mathematics) , mechanics , structural engineering , natural frequency , amplitude , materials science , engineering , physics , mechanical engineering , acoustics , composite material , quantum mechanics
Nuclear reactor fuel assemblies are mainly composed of cylinders bundle(CB), calculating the dynamics characteristics of CB under axial flow can lay a foundation for predicting fretting wear and vibration fatigue. In the paper, the CB coupling dynamic model of forced vibration under pulsating flow is established. And the stability analysis and natural frequency calculation of the CB system under steady flow are compared with the existing results to verify the model. Finally, the Runge-Kutta method is applied to solve the forced vibration equation of the CB under pulsating flow. The influence of the pulsating parameters m, w0, on the amplitude-frequency characteristics and the motion trajectory of the midspan cross section of the CB under forced vibration are analyzed and discussed. The results show that the pulsating parameters have an important influence on the vibration of the CB system.