Show/Hide Menu
Hide/Show Apps
Logout
Türkçe
Türkçe
Search
Search
Login
Login
OpenMETU
OpenMETU
About
About
Open Science Policy
Open Science Policy
Communities & Collections
Communities & Collections
Help
Help
Frequently Asked Questions
Frequently Asked Questions
Guides
Guides
Thesis submission
Thesis submission
MS without thesis term project submission
MS without thesis term project submission
Publication submission with DOI
Publication submission with DOI
Publication submission
Publication submission
Supporting Information
Supporting Information
General Information
General Information
Copyright, Embargo and License
Copyright, Embargo and License
Contact us
Contact us
Response-Controlled Stepped-Sine Test (RCT): A New Approach in Measuring Frequency Responses of Nonlinear Systems
Download
188-IMAC38_Response-Controlled Stepped-Sine Test (RCT)- A New Approach in Measuring Frequency Responses of Nonlinear Systems_2020.pdf
Date
2020-2-10
Author
Özgüven, Hasan Nevzat
Karaağaçlı, Taylan
Metadata
Show full item record
This work is licensed under a
Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License
.
Item Usage Stats
21
views
4
downloads
Cite This
As a result of being widely used in linear experimental modal analysis for many years, force-controlled stepped-sine test approach is the first method that comes to mind in measuring frequency responses of nonlinear systems as well. However, in testing structures showing strong nonlinearity, force-control test strategy is not capable of capturing unstable branch of a nonlinear frequency response, which results in jump phenomenon in stepped-sine testing. On the other hand, experimental continuation methods capable of tracing unstable branches rely on sophisticated control algorithms by giving up industrial standards. Moreover, determination of nonlinear modal damping ratio is a considerable issue in these methods. This paper presents a novel approach called Response-Controlled stepped-sine Test (RCT). By combining RCT with a new concept called Harmonic Force Surface (HFS), unstable branches of frequency responses of nonlinear systems can be measured employing standard equipment, i.e. commercial hardware and software, which makes it very attractive especially for industrial applications. Furthermore, determination of nonlinear modal damping ratio in RCT is quite straightforward by making use of quasi-linearization of frequency responses of nonlinear structures. This approach has successfully been used by the authors in two recent works: In developing new methods for experimental modal analysis of nonlinear structures, and for nonparametric identification of nonlinearity. In this paper, the capability of RCT to capture unstable branches of frequency response curves in strongly nonlinear structures is demonstrated on a bench mark test setup and on a control fin actuation mechanism of a real missile.
Subject Keywords
Harmonic force surface
,
Nonlinear frequency response
,
Unstable branch
,
Nonlinear system identification
,
Response-controlled stepped-sine testing
URI
https://hdl.handle.net/11511/105237
Conference Name
IMAC XXXVIII: Conference & Exposition on Structural Dynamics (February 10-13, 2020)
Collections
Department of Mechanical Engineering, Conference / Seminar
Citation Formats
IEEE
ACM
APA
CHICAGO
MLA
BibTeX
H. N. Özgüven and T. Karaağaçlı, “Response-Controlled Stepped-Sine Test (RCT): A New Approach in Measuring Frequency Responses of Nonlinear Systems,” presented at the IMAC XXXVIII: Conference & Exposition on Structural Dynamics (February 10-13, 2020), Houston, Texas, 2020, Accessed: 00, 2023. [Online]. Available: https://hdl.handle.net/11511/105237.