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Classical closed form theory says that its always mass, stiffness, damping and restraints that natural frequency values depend upon. In FEA, the type and number of elements can also have a strong effect. For modes that involve bending, I always use high quality elements. For bending, draft elements don't cut it since the lack of mid side nodes makes the possibility of simulating the curvilinear nature of bending remote. BTW, natural frequency's weaker dependence upon damping isn't simulated by the solver in 2007.