Detection and Identification of Nonlinear Contact Dynamics at Workpiece Clamping Positions
| 1 | Institute for Machine Tools (IfW), University of Stuttgart, Germany |
| 2 | Graduate School of Excellence advanced Manufacturing Engineering (GSaME), University of Stuttgart, Germany |
CORRESPONDING AUTHOR
Qi Feng
Institute for Machine Tools (IfW), University of Stuttgart, Holzgartenstr. 17, 70174, Stuttgart, Germany
Institute for Machine Tools (IfW), University of Stuttgart, Holzgartenstr. 17, 70174, Stuttgart, Germany
Submission date: 2023-02-04
Final revision date: 2023-02-26
Acceptance date: 2023-02-27
Online publication date: 2023-03-03
Publication date: 2023-04-12
Journal of Machine Engineering 2023;23(1):114–122
KEYWORDS
TOPICS
ABSTRACT
All mechanical systems behave nonlinearly to a certain extent since there are always reasons for nonlinearities, such as friction and slip effects, in the actual structures. It is important to detect and identify the nonlinearity due to friction and contact in order to investigate their effect on the global behavior of the workpiece-fixture system. That is a prerequisite for modeling the dynamic contact behavior at the interface between the workpiece and clamping elements. In this research, the workpiece-fixture system was excited with a shaker using the swept sine signal. The nonlinearities was detected by comparing and analyzing the frequency responses of the structures in Bode plots. However, the nonlinearities behaved differently at various frequencies within the observation range. Different mechanisms such as nonlinear stiffness and damping, micro-slip friction, are responsible for that. Then the nonlinear contact behavior at the clamping positions was successfully identified by means of the Hilbert transform.
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