Abstract
The paper describes the two different techniques to shorten the computer run time spent by the structure analysis based on Diakoptics. The first technique consists of the neglect of the higher modes of the substructures to be assembled. This approximation technique is efficient when the dynamic characteristics of the total structure are needed for only the lower modes. The second technique consists of the neglect of the unnecessary point displacements. This second technique is efficient when only the external mode shapes or only the compliance transfer function between the specific points are needed for the total structure. The technique gives the accurate results for the points computed.The results of the test analyses show that the computer run time for the calculation based on Diakoptics can be reduced down to about one fifth of that of the conventional finite element method when the proposed techniques are applied to the original method of Diakoptics.
