Modeling of the feed drive system basing on torsion multi-oscillator

Demand on the high quality of parts takes the task that the CNC machine tool should have more accuracy and high productivity when it processes parts. From this task we can track back to the performance of the feed drive system of CNC machine tools. The test stand of feed drive system made up of ball screw assemblies is here modeled. The natural frequency of the test stand is analyzed on the modeling basing on the torsion multi-oscillator, which is composed of torsion spring-damper and mass moment of inertia. The transfer matrix method is adopted to analyze the model which has own complex state equation and provides a powerful tool for the multi-body system dynamics because the global dynamics equations of the system are not needed and the orders of involved system matrices are decreased greatly. The natural frequency of the system is here discussed. Key words: natural frequency, transfer matrix, CNC machine tool, modeling and simulation.