The study focuses on the numerical analysis method of modal aerodynamic damping of large horizontal axis wind turbine flexible blades. By applying the modeling method of multi-body system dynamics and the blade aerodynamic model of a wind turbine, the aeroelastic coupling equation of the flexible blade is established. Also, the formula calculating the blade modal aerodynamic damping ratio is derived, based on the aeroelastic response obtained by numerically solving the coupling equation of the blade operating under certain working condition, the blade modal parameters identification, including the modal frequency, vector and mass, and the energy loss due to vibration, i.e. computing the work done by the aerodynamic force within one vibrational circle. Furthermore, the analysis process of the modal aerodynamic damping ratios of the blade flapwise and edgewise modes is built. A blade with flexibility is chosen as the research subject and its aerodynamic damping ratio of the first order mode is analyzed. The analysis results verify the effectiveness and reliability of the presented analysis method. The research supplies a feasible way for analyzing the aerodynamic damping characteristics and aeroelastic stability of large wind turbine blade with flexibility.
CHI Zhiqiang
,
XIA Hongjian
,
LI Deyuan
,
ZHANG Xiangwei
. Study on Modal Aerodynamic Damping Analysis Method for Wind Turbine Blade[J]. Journal of Mechanical Engineering, 2018
, 54(2)
: 176
-183
.
DOI: 10.3901/JME.2018.02.176
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