rho0 830[kg/m^3] Density of fuel c0 1360[m/s] Speed of sound in fuel lam0 c0/fmax Wavelength at maximum frequency mesh_size 15[mm] Maximum size for the shell boundaries min_mesh_factor 1.5 Ratio between minimum and maximum mesh length strap_th 2[mm] Thickness of the fuel tank straps wall_th 1.6[mm] Thickness of the fuel tank wall a0 1[m/s^2] Acceleration reference used to excite the system d0 a0/(1000[Hz])^2 Displacement reference used to excite the system fmin 50[Hz] Minimum frequency of the analysis fmax 250[Hz] Maximum frequency of the analysis deltaf 2.5[Hz] Steps in the frequency sweep