Vibration reduction characteristics of double-layer dry friction damper for turbine blade
MAN Jixin1,2,3,4, GAO Qing1,2,3, ZENG Wu1,2,3, QIU Xinke1,2,3,4
1.Advanced Gas Turbine Laboratory, Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijing 100190, China;
2.Key Laboratory of Advanced Energy and Power， Institute of Engineering Thermophysics, Chinese Academy of Sciences, Beijjing,100190, China;
3.Innovation Academy for Light-duty Gas Turbine, Chinese Academy of Sciences, Beijjing, 100190, China;
4.School of Engineering and Science, University of Chinese Academy of Sciences， Beijing 100049, China
Abstract：The influence of the double friction damper on the vibration reduction of a gas turbine blade was studied. Firstly, the microslip model of friction damper was extended to establish a macro-micro slip model. Secondly, the friction-displacement curve was simulated, and the hysteresis curves of different slip stages were obtained. The equivalent stiffness and damping of the damper were calculated by using the equivalent linearization method associated with first order harmonic balance method (HBM). Finally, the finite element model of double friction damper of turbine blade was established, and the influence of key parameters of the damper on blade vibration response was analyzed. The results show that the double friction damper has a better damping effect than the single friction damper. The double friction damper makes the system achieve a better damping effect under a smaller normal force, and the blade response peak value is maintained at a lower level within a wide range of external excitation.
Key words: reduced vibration; slip model; hysteresis curve; first order harmonic balance method
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