Combination of the FORM-Routine with Fluid-Structure Interaction Code Library

To simulate an impact of variation of structural parameters on the aeroelastic re­sponse of the wing, the ifls-code-library was embedded into the routines performing the FORM algorithm. A NASTRAN input file of the finite element wing model was created with the ability to vary the structural properties during the stochastic pro­cess. Two input parameters are defined to be altered within the wing box structure: the thickness t of the thin-walled structural members and the Young’s modulus E of the material. For stochastic input parameters a normal distribution is assumed. The shape of the normal distribution and, therefore, the extent of the deviation of the input parameters are characterized by the coefficient of variation (COV) V = ст/д. The COV is defined as a ratio of the standard deviation ст to the mean value д. For a random variable with V = 0.1 the probability is 31.7% that the deviation of this variable exceeds ±10%.