OPTIMIZATION OF EXCITATION LOCATION FOR WIND TURBINE BLADE FATIGUE TEST BASED ON DAMPING EFFECT

Abstract

Abstract: Composite wind turbine blades are one of the key components of wind power generation system. During the full-size fatigue test period, the structural damping of composite materials and the modal damping factors such as aerodynamic resistance in the test environment have an uncertain impact on the dynamic characteristics of wind turbine blades. Accurately obtaining the vibration characteristics of wind power blades is of great theoretical and practical significance for accurately designing the excitation position of fatigue test. In this paper, based on the theory of transfer function, the fatigue test system of wind power blade is simplified to a dynamic model of damping system with one degree of freedom. The vibration characteristics of composite wind turbine blade in fatigue test were studied by frequency response analysis with finite element simulation model. Then three different excitation position proportional coefficients are discussed to determine the optimal scheme of single excitation position in fatigue test. The correctness of the finite element simulation analysis and the reliability of the optimization scheme were verified by the flap-wise fatigue test of LZ76-3.X.

Key words: composite, wind turbine blade, fatigue test, transfer function, modal damping, finite element simulation, excitation position factor

CLC Number:

TB332

ZHU Rui, HUANG Hui-xiu, YU Yong-feng, YUAN Yi-nan. OPTIMIZATION OF EXCITATION LOCATION FOR WIND TURBINE BLADE FATIGUE TEST BASED ON DAMPING EFFECT[J]. Composites Science and Engineering, 2020, 0(8): 102-106.

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