The use of modal analysis to improve the axis control

摘要

The main objective of an efficient axis control is to reproduce on the tool (or the workpiece) the reference wished for the machine accuracy. Every process control requires the knowledge of its input-output relationships one problem is the research of appropriateness model - real system - control dynamic performances. The delicate question is to know the distribution of elasticity and frictions. The purpose of this paper is to present an approach by parametrical identification which requires the use of modal analysis algorithms. The tests, realized on existing machine tools, lead to the estimation of modal parameters in order to adjust a theoretical model. This original use of modal analysis techniques brings an appreciable help to the engineers who are in charge of the realization of the servocontrols.