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Frontiers of Structural and Civil Engineering

Front Struc Civil Eng    2012, Vol. 6 Issue (1) : 53-56
Optimization design of spar cap layup for wind turbine blade
Jie ZHU1(), Xin CAI1,2, Pan PAN1, Rongrong GU1
1. College of Mechanics and Materials, Hohai University, Nanjing 210098, China; 2. College of Water Conservancy and Hydropower Engineering, Hohai University, Nanjing 210098, China
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Based on the aerodynamic shape and structural form of the blade are fixed, a mathematical model of optimization design for wind turbine blade is established. The model is pursued with respect to minimum the blade mass to reduce the cost of wind turbine production. The material layup numbers of the spar cap are chosen as the design variables; while the demands of strength, stiffness and stability of the blade are employed as the constraint conditions. The optimization design for a 1.5 MW wind turbine blade is carried out by combing above objective and constraint conditions at the action of ultimate flapwise loads with the finite element software ANSYS. Compared with the original design, the optimization design result achieves a reduction of 7.2% of the blade mass, the stress and strain distribution of the blade is more reasonable, and there is no occurrence of resonance, therefore its effectiveness is verified.

Keywords wind turbine blade      spar cap layup      optimization design      blade mass     
Corresponding Authors: ZHU Jie,   
Issue Date: 05 March 2012
 Cite this article:   
Jie ZHU,Xin CAI,Pan PAN, et al. Optimization design of spar cap layup for wind turbine blade[J]. Front Struc Civil Eng, 2012, 6(1): 53-56.
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Rongrong GU
Fig.1  Blade planform and a typical structural cross section
layup numbersstress/MPastrain/μtip deflection/mfirst natural frequency/Hz
lower bound20---≤0.94 or≥0.96
upper bound655205 0005.5
Tab.1  Range values of the constraint conditions
Fig.2  Finite element model of the blade
Fig.3  Distribution of the loads
Fig.4  Comparison of the material layup numbers between the original design and the optimization design
schemeblade mass/kgmaximum stress/MPamaximum strain/μmaximum tip deflection/mthe first natural frequency/Hz
the original design6543.690.04519.64.51.01
the 8th optimization design6348.693.34719.74.90.99
the 12th optimization design6283.394.84866.45.00.99
the final optimization design6070.299.75000.05.20.98
Tab.2  Structural performance of the blade before and after optimization
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