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Vibration Simulation Using LuGre Friction Model for Cladding Tube Fretting Wear Analysis

피복관 프레팅마모 해석을 위한 LuGre 마찰모델 성능 고찰

Park, Nam-Gyu;Kim, Jin-Seon;Kim, Joong-Jin;Kim, Jae-Ik
박남규;김진선;김중진;김재익

  • Received : 2015.10.21
  • Accepted : 2015.11.27
  • Published : 2016.01.20

Abstract

Nuclear fuels are always exposed to hot temperature and high speed coolant flow during the reactor operation. Thus the fuel rod accompanies small amplitude vibration due to the turbulent flow. The random vibration causes friction between the fuel rod and the grid structure which provides the lateral supports. The friction is critical to the fuel rod fretting wear, and it degrades fuel performance when a severe wear is developed. LuGre friction model is introduced in the paper, and the performance was evaluated comparing to the classical Coulomb model. It is shown that the developed friction force considering the Coulomb friction is not enough to stop or delay the motion while the stick-slip can be simulated using LuGre friction model. Numerical solutions of the two dimensional spacer grid cell model with the modern friction are also reviewed, and it is discussed that the new friction model simulates well the nonlinear mechanism.

Keywords

Fretting Wear;Fuel Rod;LuGre Friction;Coulomb Friction;Stick-slip

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