The optimal design of a panel flutter problem is investigated in this paper. A semi-infinite flat panel with either a homogeneous or sandwich cross section is considered. The thickness distribution of the panel is allowed to vary while the total weight is held fixed, and the distribution which maximizes the critical flutter parameter for stability is chosen as the optimal design. This design is calculated here by means of a generalized Ritz procedure, with the panel thickness assumed to have a certain form.
Variations in the following parameters are then considered: a minimum allowable thickness, aerodynamic damping, in-plane loading, and nonstructural stiffness and mass for the case of a sandwich panel. It is shown that the optimal design may be significantly affected by changes in these parameters.
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- a i :
- D(X),D 0 :
- E c ,E f :
Young modulus of core and face sheets, respectively
- g :
=ρ UL 2(M 2−2)/[(M 2−1)3/2 (D 0 μ 0)1/2], aerodynamic damping parameter
- H(X),H 0 :
thickness of homogeneous panel
- H c :
thickness of sandwich panel core
- h(x),h i :
nondimensional panel thickness,h=H/H 0
- L :
- M :
=μ/μ 0, nondimensional mass
- p i :
coefficients of characteristic equation
- R x :
midplane compressive load
- r :
=R x L 2/D 0, nondimensional load
=D/D 0, nondimensional stiffness
- T(X),T 0 :
thickness of sandwich panel face sheets
- t(x),t i :
nondimensional face sheet thickness,t=T/T 0
- U :
speed of supersonic flow
- V :
functional in Ritz method
- W 0 :
total weight of reference uniform panel
panel deflection amplitude
=W/L, nondimensional deflection amplitude
- w i (x):
- X :
coordinate along length in airflow direction
- x :
=X/L, nondimensional length coordinate
- α i ,β i ,ε i ,ν ij :
integrals in Ritz equations
- γ :
- δ :
=(1+E c H c /6E f T 0)−1, nonstructural stiffness parameter
- η :
=(1+ρ c H c /2ρ f T 0)−1, nonstructural mass parameter
- λ :
=ρ U 2 L 3/[D 0(M 2−1)1/2], dynamic pressure parameter
- λ*,λ 0*:
critical value ofλ for stability
- μ(X),μ 0 :
panel mass per unit area
- ρ :
density of air
- ρ c ,ρ f :
density of core and face sheets, respectively
- σ :
- τ :
=σ(D 0/μ 0)1/2/L 2, nondimensional time
values for reference uniform panel
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This work was supported in part by the US Army Research Office-Durham and in part by the US Navy under Grant No. NONR-N00014-67-A-0191-0009.
Communicated by W. Prager
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Cite this article
Plaut, R.H. The effects of various parameters on an aeroelastic optimization problem. J Optim Theory Appl 10, 321–330 (1972). https://doi.org/10.1007/BF00934804
- Optimal Design
- Total Weight
- Thickness Distribution
- Sandwich Panel
- Flat Panel