P. Level et al., ON A DIRECT INVERSION OF THE IMPEDANCE MATRIX IN RESPONSE REANALYSIS, Communications in numerical methods in engineering, 12(3), 1996, pp. 151-159
The paper lays out an exact method, using the receptance strategy to c
alculate the frequency response of a modified structure. A direct inve
rsion of the modified impedance matrix is proposed, which reduces the
computation time for successive calculations of an evolving design of
the structure.