Abstract
High-altitude propellers equipped with solar energy systems are widely adopted in stratospheric airships because of their light weight, excellent mechanical performance, and high efficiency. To optimize the composite laminated structure of the blade, a hierarchical optimization method based on genetic algorithm is carried out. Global and local layers are combined according to the structural and loading properties of the blade, and each partitioned region in the local layer is optimized independently. Combined with the finite element method, a subprogram based on the classical lamination theory is developed to simulate the stiffness matrix of the blade and obtain the deflection, weight, etc. as objects. The restricted condition, whether the structure has failed, is determined by the Tsai-Wu criterion. In addition, multiple tasks are delivered and read simultaneously by a specific program for the sake of improving computation efficiency. After verification with a case study, the stacking sequence and thickness of the blade of a stratospheric airship propeller is optimized and an ideal result is obtained.
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Abbreviations
- T :
-
Thickness of each composite layer
- N r :
-
Number of local region layers
- N w :
-
Number of global region layers
- p c :
-
Crossover rate between individuals
- p m :
-
Mutation rate of individuals
- N elite :
-
Number of elites
- F i :
-
Fitness function of the ith individual
- D ik :
-
Nondimensional value of the kth weighting parameter for the ith individual
- ω k :
-
Weight coefficient of the kth weighting parameter
- N F :
-
Number of weighting parameters
- \( {F}_i^{\ast } \) :
-
Modified fitness function of the ith individual
- b :
-
Ideal minimum value of F i
- a :
-
Difference between average and minimum value of F i
- α , β :
-
Modified indexes of the fitness function
- E i :
-
Evaluation function
- P i :
-
Penalty function
- Δb k :
-
Violation for the kth chromosome
- ε :
-
A small positive number
- g k :
-
Objective value of F i
- b k :
-
Actual minimum value of F i
- N Gen :
-
Decimal expression of the gene sequence
- f 1 , f 2 :
-
Two uniformly distributed loads
- ρ :
-
Density of each layup
- η c :
-
Crossover possibility
- η m :
-
Mutation possibility
- p m :
-
Heritability
- M :
-
Population size
- G :
-
Maximum generation number
- ξ :
-
Growth rate of optimal fitness
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Acknowledgements
This research was supported by the China Postdoctoral Science Foundation under Grant No. 2016 M600891. The authors thank all the people involved in the past and present progress of the experiment. The authors are also grateful to the reviewer and the executive editor for their valuable suggestions regarding this paper.
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Meng, J., Hu, J., Xiao, H. et al. Hierarchical optimization of the composite blade of a stratospheric airship propeller based on genetic algorithm. Struct Multidisc Optim 56, 1341–1352 (2017). https://doi.org/10.1007/s00158-017-1725-1
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DOI: https://doi.org/10.1007/s00158-017-1725-1