On-line modal identification of a CNC machining system based on surface roughness laser scattering: theoretical perspectives

Publisher Summary This chapter presents an investigation on on-line modal identification of computer numerically controlled (CNC) machining system in order to optimally control the system based on the system dynamics modal parameters identified. It proposes an on-line modal identification approach by using surface roughness laser scattering in the process. By on-line identifying the surface roughness (R z ) which is a collective signature resulted from the machining process, the dynamic modal variables of the machining system are derived based on the algorithms developed. Furthermore, the theoretical aspects of the approach are explored including measurement of R z , correlation between R z and vertical vibrations in the system, dominant equation and solutions, and algorithms and their implementation with MATLAB. The experimental set up and trials are explored albeit more experimental cutting trials are planned and to be carried out in the near future.