UNCERTAINTY IN STRUCTURE DYNAMICS RESULTING FROM MATRIX ILL-CONDITIONING

In the paper there are discussed certain issues concerning ill-posed problems that fre-quently appear in inverse problems, modal analysis, acoustics and other methods making use of matrix algebra. There is presented the mathematical definition, application of the singular value decomposition method to ill-posed problems detecting as well as a new method of im-proving such problems conditioning by the use of the Tikhonov regularization method. In the paper are presented some results of solution estimation of the Fredholm integral equation of the first kind that is the classical ill-posed problem. Analysis was carried out in the Matlab environment by means of the least squares and Tikhonov regularization methods for both the noiseless and noisy cases. Key words: ill-posed problem, ill-conditioned matrix, Tikhonov regularization method. 1