Redukcja stopni swobody układów dyskretnych

The paper presents a modification of Rivin's method of reduction of the number of degrees of freedom of discrete systems. By introducing the notion of a complex rigidity coefficient the reduction formulae for the damping coefficients are obtained. The method is then applied to the calculation of the amplitude-phase characteristics of the main drive of the Fu-1a milling machine. The results of these calculations indicate that the proposed method is practically accurate and applicable in the frequency range of <10^3 s^-1.