Abstract
A method is presented for identifying the discrete linear dynamic model expressed by mass, stiffness and damping parameters of a mechanical structure. First, the characteristic matrix of the structure system is determined from the identified modal parameters. Secondary, the mass parameters are identified from the autocorrelation function of the measured responses and the ones calculated from modal parameters in the case of one sine-wave excitation. Consequently the stiffness and damping parameters are obtained from the identified mass parameters and the characteristic matrix. Finally, a numerical simulation example and an experimental example which is a cantilevered pipe structure are demonstrated in detail. It is shown that the present method is applicable for the identification problems of practical structures since the test data can be obtained without additional complications.
