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Formulation for Interaction Analysis Between Continuous and Discrete Structures Subject to Moving Loads Applied to Turning

[+] Author Affiliations
Jon Madariaga, Ismael Ruiz

IK4-Tekniker, Eibar, Spain

Tsu-Chin Tsao

UCLA, Los Angeles, CA

Paper No. DSCC2013-3905, pp. V001T15A007; 8 pages
doi:10.1115/DSCC2013-3905
From:
  • ASME 2013 Dynamic Systems and Control Conference
  • Volume 1: Aerial Vehicles; Aerospace Control; Alternative Energy; Automotive Control Systems; Battery Systems; Beams and Flexible Structures; Biologically-Inspired Control and its Applications; Bio-Medical and Bio-Mechanical Systems; Biomedical Robots and Rehab; Bipeds and Locomotion; Control Design Methods for Adv. Powertrain Systems and Components; Control of Adv. Combustion Engines, Building Energy Systems, Mechanical Systems; Control, Monitoring, and Energy Harvesting of Vibratory Systems
  • Palo Alto, California, USA, October 21–23, 2013
  • Conference Sponsors: Dynamic Systems and Control Division
  • ISBN: 978-0-7918-5612-3
  • Copyright © 2013 by ASME

abstract

A control oriented formulation of continuous structures interacting with moving and/or fixed structures is presented. Machining of long parts in a lathe is presented in order to illustrate the methodology. The system is time-varying in nature due to the movement of the cutting tool during the machining process. However the invariant part corresponding to the structure dynamics (tool and workpiece) and the time varying part corresponding to the movement of the cutting point can be separated. The link between the two is given by the eigenfunctions relating the output of the dynamic part with the actual displacement within the workpiece continuum. This splitted formulation allows modular design approaches, facilitating the inclusion and analysis of further elements such as flexible supports and/or allowing direct modifications of the characteristics of the different structural elements individually (considered vibration modes, etc.). For the presented turning example the implications of workpiece flexibility and the inclusion of flexible supports at different locations on regenerative chatter stability are also discussed.

Copyright © 2013 by ASME

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