Advanced search
Start date
(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Experimental results on chatter reduction in turning through embedded piezoelectric material and passive shunt circuits

Full text
da Silva, Maira Martins [1] ; Venter, Giuliana Sardi [1] ; Varoto, Paulo Sergio [1] ; Coelho, Reginaldo Teixeira [2]
Total Authors: 4
[1] Univ Sao Paulo, Sao Carlos Sch Engn, Dept Mech Engn, BR-13566590 Sao Carlos, SP - Brazil
[2] Univ Sao Paulo, Sao Carlos Sch Engn, Dept Prod Engn, BR-13566590 Sao Carlos, SP - Brazil
Total Affiliations: 2
Document type: Journal article
Source: MECHATRONICS; v. 29, p. 78-85, AUG 2015.
Web of Science Citations: 11

Chatter instability is an important drawback concerning high precision and accurate machining operations. Suitable strategies for chatter detection and reduction should be proposed and exploited in order to ultimately improve the final quality of machined parts. It is well known that chatter instability can be reduced by increasing damping since the later presents a proportional relationship with stability limits. The main idea in the present work is to address the issue of chatter instability by proposing a vibration reduction methodology through the use of embedded piezoelectric patches in the tool-holder connected to a passive shunt electrical circuit. This circuit is responsible for energy dissipation providing extra damping to the system. The strategy is numerically and experimentally tested in turning/boring operations. A simplified electro-mechanical distributed-parameter model is briefly described and numerically evaluated in order to assess the pothntiality of the proposed technique. Actual measured frequency response functions of the tool-holder with different shunt strategies are compared demonstrating how damping can be modified. Moreover, two different shunt strategies are evaluated during a boring operation. Preliminary experimental results point to a considerable improvement in the quality of the surface finishing when the proposed passive shunt circuits associated to the piezoelectric elements are used, indicating that the proposed strategy can be a promising and feasible solution for chatter reduction. Nevertheless, there are still some technical difficulties that should be overcome towards the full practical implementation of the proposed methodology. (C) 2015 Elsevier Ltd. All rights reserved. (AU)

FAPESP's process: 12/22470-6 - Regenerative chatter avoidance using piezoelectric material considering non-linear aspects in turning operations
Grantee:Giuliana Sardi Venter
Support Opportunities: Scholarships in Brazil - Master