• Zarina Mohd Hussin
• Kai Cheng
• Dehong Huo

On-line modal identification of a Computer Numerically Controlled (CNC) machining system is essential and much needed for understanding the system dynamics and so as to control the system’s performance in the process in the light of the dynamic variables identified. In this paper, an on-line modal identification approach is proposed by using surface roughness laser scattering in the process. By on-line identifying the surface roughness (Rz) 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 by the authors. Furthermore, the theoretical aspects of the approach are explored including measurement of Rz, correlation between Rz and vertical vibrations in the system, dominant equation and solutions, and algorithms and their implementation with MATLAB, etc. The experimental set up and trials are also explored albeit more experimental cutting trials are planned and to be carried out in the near future.