Based on the ideas of the resonance response results of the single degree of freedom under harmonic load calculated by the elemental point quality the authors put forward the new way of a multi-degree of freedom structure system to calculate with the modal of the quality. On this method with the finite element software it is to obtain modal quality, to solve a number of problem that the finite element software that it can not extract directly the modal quality. Compared with the results that be calculated by the modal quality in the original formula, ...
