tailieunhanh - ScienceDirect International Journal of Machine Tools & Manufacture 48 (2008) 832–840

Centerless grinding operations present some characteristic features that make the process especially susceptible to regenerative chatter instabilities. Theoretical study of these vibrations present some difficulties due to the large amount of parameters involved in the process and, in addition, such a study requires a precise determination of dynamic properties of the particular machine under study. Taking into account the important role of the dynamic characteristics in the process, in this paper both analytic and experimental approaches are used with the aim of studying precisely the vibration modes participating in the response. Using as reference results obtained from an experimental modal analysis (EMA) performed in the machine, the finite element (FE) model was validated and improved using correlation and updating techniques. | ELSEVIER Available online at ScienceDirect International Journal of Machine Tools Manufacture 48 2008 832-840 INTERNATIONAL JOURNAL OF machinetools MANUFACTURE DESIGN RESEARCH AND APPLICATION locate ijmactool Dynamic model of a centerless grinding machine based on an updated FE model I. Garitaonandiaa . Fernandesa J. Albizurib aDepartment of Mechanical Engineering Faculty of Mining Engineering University of the Basque Country Colina de Beurko s n 48902 Barakaldo Spain Department of Mechanical Engineering Faculty of Engineering University of the Basque Country Alameda de Urquijo s n 48013 Bilbao Spain Received 20 August 2007 received in revised form 29 November 2007 accepted 4 December 2007 Available online 15 December 2007 Abstract Centerless grinding operations present some characteristic features that make the process especially susceptible to regenerative chatter instabilities. Theoretical study of these vibrations present some difficulties due to the large amount of parameters involved in the process and in addition such a study requires a precise determination of dynamic properties of the particular machine under study. Taking into account the important role of the dynamic characteristics in the process in this paper both analytic and experimental approaches are used with the aim of studying precisely the vibration modes participating in the response. Using as reference results obtained from an experimental modal analysis EMA performed in the machine the finite element FE model was validated and improved using correlation and updating techniques. This updated model was used to obtain a state space reduced order model with which several simulations were carried out. The simulations were compared with results obtained in machining tests and it was demonstrated that the model predicts accurately the dynamic behavior of the centerless grinding machine especially concerning on chatter. 2007 Elsevier Ltd. All rights .