LI Yilong, GUO Yan, RAN Shuangye, et al. Vibration characteristics of multi-span fuel rods solved by the transfer matrix method and mode superposition method[J/OL]. Acta Scientiarum Naturalium Universitatis Sunyatseni, 2026, 1-8.
DOI:
LI Yilong, GUO Yan, RAN Shuangye, et al. Vibration characteristics of multi-span fuel rods solved by the transfer matrix method and mode superposition method[J/OL]. Acta Scientiarum Naturalium Universitatis Sunyatseni, 2026, 1-8. DOI: 10.11714/acta.snus.ZR20260005.
Vibration characteristics of multi-span fuel rods solved by the transfer matrix method and mode superposition method
In pressurized water reactors,these rods are commonly constrained by spacer grids,forming a multi-span beam configuration characterized by multiple elastic supports. Concurrently,the flow channels housing the fuel rods experience turbulence induced by axial flow interacting with the spacer grids,leading to increased excitation forces on the fuel rod surfaces compared to pure axial flow conditions. Based on the transfer matrix method(TMM) and the anisotropy of fuel rod stiffness, a multi-elastic constraint model of fuel rod bending vibration was established.. Additionally,the mode superposition method(MSM) is utilized to simulate and investigate the vibration response of fuel rods subjected to axial flow by applying segmented harmonic excitations. A comparative assessment of various elastic constraint failure scenarios is also performed. Finally,the method’s accuracy is verified.
BROCKMEYER L , SAINI N , TENTNER A , et al , 2024 . Evaluation of RANS vs. LES simulation of fluid flow through <math id="M38"><mn mathvariant="normal">3</mn><mo>×</mo><mn mathvariant="normal">3</mn></math> https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=103236887&type= https://html.publish.founderss.cn/rc-pub/api/common/picture?pictureId=103236900&type= 7.11199999 2.28600001 rod bundle with a simple spacer grid as a precursor to coupled fluid-structure interaction simulations [J]. Nucl Eng Des , 430 : 113662 .
LI W , GUO H , ZHANG J , et al , 2023 . Study on the characteristics of axial fluid pressure on fuel rods with spacer grids [J]. Ann Nucl Energy , 193 : 110015 .
LIN Z , LU Z , LIU C , et al , 2026 . Transfer matrix method for calculating dynamic responses of pipeline systems with arbitrary substructures including side branches and closed loops [J]. Thin-Walled Struct , 218 : 114121 .