GENETIC ALGORITHM-BASED METHOD FOR IDENTIFYING NONLINEAR PARAMETER OF HINGE STRUCTURE

摘要

A genetic algorithm (GA)-based method for identifying a nonlinear parameter of a hinge structure. The method comprises: describing nonlinear characteristics of a hinge in a hinge structure by using a nonlinear model, creating a dynamics model of the hinge structure, and obtaining M, K, and C equations of the hinge structure; converting the M, K, and C equations of the hinge structure into a system of nonlinear algebraic equations; solving the obtained system of algebraic equations by utilizing an Newton's iterative method in numerical analysis to obtain frequency response data of the hinge structure; and creating an objective function according to the obtained frequency response data and frequency response data obtained by testing, performing a global search by means of a GA in Matlab, and finally identifying an optimal nonlinear parameter value. By means of the method, nonlinear characteristics of a hinge structure can be identified, and thus, the limitations of requiring an initial experiential value and only ensuring local optimum in a conventional method are overcome.