Identification of a Micro-Slip Friction Damping Function Using Directed Genetic Programming

This paper describes the application of directed genetic programming to explore the functional form of non-linear restoring forces that arise due to micro-slip friction. Data are obtained from an experiment to investigate the friction forces in a simple shear interface subjected to a vibration environment. A candidate functional form is proposed to model this friction, and a genetic search is then performed which seeks optimal parameters for the function. The resulting parameters provide the best fit of the proposed functional to the experimental data.