Abstract
estimates, Eqs. (8) and (9) and those obtained from NASTRAN calculations, are compared in Table 2. The large differences between the error estimates generated by NASTRAN and those computed with Eq. (8), especially for the higher modes, are due to terms O(kL) neglected in the kinetic energy error estimation. These terms become significant as (ir/N) 4 approaches unity, that is, as the number of elements per half wavelength decreases.
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