Implementation of a modal reanalysis method in a finite element analysis context Original Research Article

This paper refers to the modal reanalysis method known as ‘receptance approach’. After a brief theoretical background showing the good potential of the method in the case of large modelizations of conservative structures, several difficulties in the sense of numerical calculations are pointed out. Solutions are then given which lead to propose a general algorithm for the resolution of structural modification problems using the described method. Particular attention is given to the reduction of the data area in central memory and to the efficiency in terms of calculation time. Numerical results for small and large structures are given which show the accuracy of the method and its stability when the parameters of the modifications are varying. Concerning the computational time, it is clearly shown that a single reanalysis is not attractive but if multiple reanalyses of the same structure are required, the proposal algorithm can offer a very interesting solution.