... Foundations 27The orders, N and M, and the coefficients, pn(n = 0, 1, . . . , N)andqm(m = 0, 1, . . . , M), ofthe numerator and denominator polynomials P(ia0) and Q(i a0) are chosen according ... m and the mass densityρ0= 2000 kg/m3, and the mass and mass moments of inertia are computed by Eq. (1 06). The properties of the soil are ρ1= 2000 kg/m3, E1= 104kPa, ν1= 0.25 and ... for a rigid surface footing in the time domain: (a) displacements and rotations, and (b) forces and moments.150Fundamental and Advanced Topics in Wind PowerEfficient Modelling of Wind Turbine...