A Systematic Approach to Modal Testing of Nonlinear Structures

A. Delli Carri, D. J. Ewins

Research output: Chapter in Book/Report/Conference proceedingConference proceeding

7 Citations (Scopus)

Abstract

The application of experimental modal analysis methods to nonlinear structures (sometimes referred to as "nonlinear modal testing" - NLMT) is not a new field, but only in the past few years has it become mature enough to be approached in a systematic way. Many methods have been developed over the years for dealing with nonlinearities in structural dynamics, but nonlinearity is an extremely complex phenomenon with so many aspects and consequences that is not possible to have a single method capable to deal with all of them. Rather than taking a holistic approach, it is perhaps useful for the engineer to have a set of mathematical tools to analyse separate subsets of the whole problem, i.e. one being within the scope of each individual investigation. The main objective of this paper is to provide a modular framework from which the engineer can choose the most appropriate method to retrieve information about an examined nonlinearity, based on the type of information needed and the available data set. This is achieved by performing a breakdown of the nonlinear modal analysis process into four main stages: detection, localisation, characterisation and quantification - each of these providing a different level of insight into the problem. A review of currently-available algorithms applicable for these four categories is presented, as well as their application to two simple case studies.

Original languageEnglish
Title of host publicationTopics in Dynamics of Civil Structures- Proceedings of the 31st IMAC, A Conference on Structural Dynamics, 2013
Pages273-286
Number of pages14
Volume45
Edition7
DOIs
Publication statusPublished - 2014
Externally publishedYes
Event31st International Modal Analysis Conference on Structural Dynamics, IMAC 2013 - Garden Grove, United States
Duration: 11 Feb 201314 Feb 2013

Conference

Conference31st International Modal Analysis Conference on Structural Dynamics, IMAC 2013
CountryUnited States
CityGarden Grove
Period11/02/1314/02/13

Fingerprint

Modal analysis
Engineers
Structural dynamics
Testing

Keywords

  • Nonlinear characterisation
  • Nonlinear localisation
  • Nonlinear modal testing
  • Reverse path
  • Review

ASJC Scopus subject areas

  • Engineering(all)
  • Computational Mechanics
  • Mechanical Engineering

Cite this

Carri, A. D., & Ewins, D. J. (2014). A Systematic Approach to Modal Testing of Nonlinear Structures. In Topics in Dynamics of Civil Structures- Proceedings of the 31st IMAC, A Conference on Structural Dynamics, 2013 (7 ed., Vol. 45, pp. 273-286) https://doi.org/10.1007/978-1-4614-6585-0_25

A Systematic Approach to Modal Testing of Nonlinear Structures. / Carri, A. Delli; Ewins, D. J.

Topics in Dynamics of Civil Structures- Proceedings of the 31st IMAC, A Conference on Structural Dynamics, 2013. Vol. 45 7. ed. 2014. p. 273-286.

Research output: Chapter in Book/Report/Conference proceedingConference proceeding

Carri, AD & Ewins, DJ 2014, A Systematic Approach to Modal Testing of Nonlinear Structures. in Topics in Dynamics of Civil Structures- Proceedings of the 31st IMAC, A Conference on Structural Dynamics, 2013. 7 edn, vol. 45, pp. 273-286, 31st International Modal Analysis Conference on Structural Dynamics, IMAC 2013, Garden Grove, United States, 11/02/13. https://doi.org/10.1007/978-1-4614-6585-0_25
Carri AD, Ewins DJ. A Systematic Approach to Modal Testing of Nonlinear Structures. In Topics in Dynamics of Civil Structures- Proceedings of the 31st IMAC, A Conference on Structural Dynamics, 2013. 7 ed. Vol. 45. 2014. p. 273-286 https://doi.org/10.1007/978-1-4614-6585-0_25
Carri, A. Delli ; Ewins, D. J. / A Systematic Approach to Modal Testing of Nonlinear Structures. Topics in Dynamics of Civil Structures- Proceedings of the 31st IMAC, A Conference on Structural Dynamics, 2013. Vol. 45 7. ed. 2014. pp. 273-286
@inproceedings{f291a810e1bf418fa22746ccc5c6c9c3,
title = "A Systematic Approach to Modal Testing of Nonlinear Structures",
abstract = "The application of experimental modal analysis methods to nonlinear structures (sometimes referred to as {"}nonlinear modal testing{"} - NLMT) is not a new field, but only in the past few years has it become mature enough to be approached in a systematic way. Many methods have been developed over the years for dealing with nonlinearities in structural dynamics, but nonlinearity is an extremely complex phenomenon with so many aspects and consequences that is not possible to have a single method capable to deal with all of them. Rather than taking a holistic approach, it is perhaps useful for the engineer to have a set of mathematical tools to analyse separate subsets of the whole problem, i.e. one being within the scope of each individual investigation. The main objective of this paper is to provide a modular framework from which the engineer can choose the most appropriate method to retrieve information about an examined nonlinearity, based on the type of information needed and the available data set. This is achieved by performing a breakdown of the nonlinear modal analysis process into four main stages: detection, localisation, characterisation and quantification - each of these providing a different level of insight into the problem. A review of currently-available algorithms applicable for these four categories is presented, as well as their application to two simple case studies.",
keywords = "Nonlinear characterisation, Nonlinear localisation, Nonlinear modal testing, Reverse path, Review",
author = "Carri, {A. Delli} and Ewins, {D. J.}",
year = "2014",
doi = "10.1007/978-1-4614-6585-0_25",
language = "English",
isbn = "9781461465843",
volume = "45",
pages = "273--286",
booktitle = "Topics in Dynamics of Civil Structures- Proceedings of the 31st IMAC, A Conference on Structural Dynamics, 2013",
edition = "7",

}

TY - GEN

T1 - A Systematic Approach to Modal Testing of Nonlinear Structures

AU - Carri, A. Delli

AU - Ewins, D. J.

PY - 2014

Y1 - 2014

N2 - The application of experimental modal analysis methods to nonlinear structures (sometimes referred to as "nonlinear modal testing" - NLMT) is not a new field, but only in the past few years has it become mature enough to be approached in a systematic way. Many methods have been developed over the years for dealing with nonlinearities in structural dynamics, but nonlinearity is an extremely complex phenomenon with so many aspects and consequences that is not possible to have a single method capable to deal with all of them. Rather than taking a holistic approach, it is perhaps useful for the engineer to have a set of mathematical tools to analyse separate subsets of the whole problem, i.e. one being within the scope of each individual investigation. The main objective of this paper is to provide a modular framework from which the engineer can choose the most appropriate method to retrieve information about an examined nonlinearity, based on the type of information needed and the available data set. This is achieved by performing a breakdown of the nonlinear modal analysis process into four main stages: detection, localisation, characterisation and quantification - each of these providing a different level of insight into the problem. A review of currently-available algorithms applicable for these four categories is presented, as well as their application to two simple case studies.

AB - The application of experimental modal analysis methods to nonlinear structures (sometimes referred to as "nonlinear modal testing" - NLMT) is not a new field, but only in the past few years has it become mature enough to be approached in a systematic way. Many methods have been developed over the years for dealing with nonlinearities in structural dynamics, but nonlinearity is an extremely complex phenomenon with so many aspects and consequences that is not possible to have a single method capable to deal with all of them. Rather than taking a holistic approach, it is perhaps useful for the engineer to have a set of mathematical tools to analyse separate subsets of the whole problem, i.e. one being within the scope of each individual investigation. The main objective of this paper is to provide a modular framework from which the engineer can choose the most appropriate method to retrieve information about an examined nonlinearity, based on the type of information needed and the available data set. This is achieved by performing a breakdown of the nonlinear modal analysis process into four main stages: detection, localisation, characterisation and quantification - each of these providing a different level of insight into the problem. A review of currently-available algorithms applicable for these four categories is presented, as well as their application to two simple case studies.

KW - Nonlinear characterisation

KW - Nonlinear localisation

KW - Nonlinear modal testing

KW - Reverse path

KW - Review

UR - http://www.scopus.com/inward/record.url?scp=84882983466&partnerID=8YFLogxK

U2 - 10.1007/978-1-4614-6585-0_25

DO - 10.1007/978-1-4614-6585-0_25

M3 - Conference proceeding

SN - 9781461465843

VL - 45

SP - 273

EP - 286

BT - Topics in Dynamics of Civil Structures- Proceedings of the 31st IMAC, A Conference on Structural Dynamics, 2013

ER -