Abstract：An identification method for linear dynamical system is proposed. The Padé approximants is used to fit the curve of system's dynamic stiffness, and the coefficient matrices in the Padé polynomial are determined by the least squares method, in addition, genetic algorithms is adopted to optimize the parameters in Padé polynomial. By comparing the Padé approximants with the theory s of the system's dynamic stiffness matrices, the mass, damping and stiffness matrices can be obtained. When the order of the system is high, the POD reduced-order technology can be applied, and it means that the present method is valid for full and reduced-order model. Numerical examples illustrate the present method with good accuracy and robust.
2016, Vol. 37 
