A Ritz dynamic condensation algorithm of orthogonal expansion analysis for stochastic structures;

A dynamic condensation technique via inverse iteration method;

Based on the theory of solution to the Lyapunov and Riccati matrix equations,in this paper an in-depth analysis of the convergence of iterative dynamic condensation methods is provided and the sufficient conditions for their convergence are introduced.

In order to reduce the degree of freedom of finite element models to make it consistent with corresponding experimental degree of freedom, based on the modified system eigen-equation, a new iterative dynamic condensation formula, which reflects the transforming relation between system s major and minor degrees of freedom has been deduced.

An updating algorithm has been devised utilizing the sensitivity of FRF together with the dynamic reduction with respect to the selected design parameters.

On the basis of Ref[1],an improved approach to dynamic reduction and model modification of a mathematical model, in which reduction and modification techniques are used simultaneously, is proposed in this paper.

In this paper,a method of dynamic condensation is put forward,which can beused in complex modes with damped oscillation system.

A dynamic condensation model based on optimization principle is presented.