Tuned-sinusoidal method for operational modal analysis of small and light structures

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ROVŠČEK, Domen ;SLAVIČ, Janko ;BOLTEŽAR, Miha .
Tuned-sinusoidal method for operational modal analysis of small and light structures. 
Strojniški vestnik - Journal of Mechanical Engineering, [S.l.], v. 60, n.3, p. 187-194, june 2018. 
ISSN 0039-2480.
Available at: <https://www.sv-jme.eu/article/tuned-sinusoidal-method-for-operational-modal-analysis-of-small-and-light-structures/>. Date accessed: 15 dec. 2018. 
doi:http://dx.doi.org/10.5545/sv-jme.2013.1371.
Rovšček, D., Slavič, J., & Boltežar, M.
(2014).
Tuned-sinusoidal method for operational modal analysis of small and light structures.
Strojniški vestnik - Journal of Mechanical Engineering, 60(3), 187-194.
doi:http://dx.doi.org/10.5545/sv-jme.2013.1371
@article{sv-jmesv-jme.2013.1371,
	author = {Domen  Rovšček and Janko  Slavič and Miha  Boltežar},
	title = {Tuned-sinusoidal method for operational modal analysis of small and light structures},
	journal = {Strojniški vestnik - Journal of Mechanical Engineering},
	volume = {60},
	number = {3},
	year = {2014},
	keywords = {operational modal analysis; tuned-sinusoidal method; mode shape normalisation; small and light structures; single response; acoustic excitation},
	abstract = {Small and light structures have some distinctive features that intensify the difficulties of measuring their modal parameters. The mass that is added to the structure by the sensors cannot be neglected and the resonant frequencies are usually relatively high, therefore a wide frequency range of measurement is needed. There are also difficulties with assuring the proper excitation, so that all the measured modes are excited well and that at the same time the excitation level is not too large, which would cause larger response of the structure than the measuring ranges of the sensors can cover. In this study an innovative method for operational modal analysis of small and light structures is presented. The method is non-contact, therefore there is no added mass of the sensors to the structure. The structure is acoustically excited with a pure sine signal that is tuned to each resonant frequency. A single response measurement with the Laser Doppler Vibrometer in individual points is needed to determine the modal parameters. A mass-change strategy is used for the mass-normalisation of the measured mode shapes. The main contribution of the presented method compared to other similar methods is that the mode shapes are better accentuated (due to sine excitation), which can improve the results of the modal analysis on small and light structures, where the response of the structure is weak. The method is also easy to perform, because only a single response measurement is needed for each point and the excitation force does not need to be measured. The presented method gives accurate results, which was confirmed with the comparison of the experimental and the numerical results on a sample of simple geometry.},
	issn = {0039-2480},	pages = {187-194},	doi = {10.5545/sv-jme.2013.1371},
	url = {https://www.sv-jme.eu/article/tuned-sinusoidal-method-for-operational-modal-analysis-of-small-and-light-structures/}
}
Rovšček, D.,Slavič, J.,Boltežar, M.
2014 June 60. Tuned-sinusoidal method for operational modal analysis of small and light structures. Strojniški vestnik - Journal of Mechanical Engineering. [Online] 60:3
%A Rovšček, Domen 
%A Slavič, Janko 
%A Boltežar, Miha 
%D 2014
%T Tuned-sinusoidal method for operational modal analysis of small and light structures
%B 2014
%9 operational modal analysis; tuned-sinusoidal method; mode shape normalisation; small and light structures; single response; acoustic excitation
%! Tuned-sinusoidal method for operational modal analysis of small and light structures
%K operational modal analysis; tuned-sinusoidal method; mode shape normalisation; small and light structures; single response; acoustic excitation
%X Small and light structures have some distinctive features that intensify the difficulties of measuring their modal parameters. The mass that is added to the structure by the sensors cannot be neglected and the resonant frequencies are usually relatively high, therefore a wide frequency range of measurement is needed. There are also difficulties with assuring the proper excitation, so that all the measured modes are excited well and that at the same time the excitation level is not too large, which would cause larger response of the structure than the measuring ranges of the sensors can cover. In this study an innovative method for operational modal analysis of small and light structures is presented. The method is non-contact, therefore there is no added mass of the sensors to the structure. The structure is acoustically excited with a pure sine signal that is tuned to each resonant frequency. A single response measurement with the Laser Doppler Vibrometer in individual points is needed to determine the modal parameters. A mass-change strategy is used for the mass-normalisation of the measured mode shapes. The main contribution of the presented method compared to other similar methods is that the mode shapes are better accentuated (due to sine excitation), which can improve the results of the modal analysis on small and light structures, where the response of the structure is weak. The method is also easy to perform, because only a single response measurement is needed for each point and the excitation force does not need to be measured. The presented method gives accurate results, which was confirmed with the comparison of the experimental and the numerical results on a sample of simple geometry.
%U https://www.sv-jme.eu/article/tuned-sinusoidal-method-for-operational-modal-analysis-of-small-and-light-structures/
%0 Journal Article
%R 10.5545/sv-jme.2013.1371
%& 187
%P 8
%J Strojniški vestnik - Journal of Mechanical Engineering
%V 60
%N 3
%@ 0039-2480
%8 2018-06-28
%7 2018-06-28
Rovšček, Domen, Janko  Slavič, & Miha  Boltežar.
"Tuned-sinusoidal method for operational modal analysis of small and light structures." Strojniški vestnik - Journal of Mechanical Engineering [Online], 60.3 (2014): 187-194. Web.  15 Dec. 2018
TY  - JOUR
AU  - Rovšček, Domen 
AU  - Slavič, Janko 
AU  - Boltežar, Miha 
PY  - 2014
TI  - Tuned-sinusoidal method for operational modal analysis of small and light structures
JF  - Strojniški vestnik - Journal of Mechanical Engineering
DO  - 10.5545/sv-jme.2013.1371
KW  - operational modal analysis; tuned-sinusoidal method; mode shape normalisation; small and light structures; single response; acoustic excitation
N2  - Small and light structures have some distinctive features that intensify the difficulties of measuring their modal parameters. The mass that is added to the structure by the sensors cannot be neglected and the resonant frequencies are usually relatively high, therefore a wide frequency range of measurement is needed. There are also difficulties with assuring the proper excitation, so that all the measured modes are excited well and that at the same time the excitation level is not too large, which would cause larger response of the structure than the measuring ranges of the sensors can cover. In this study an innovative method for operational modal analysis of small and light structures is presented. The method is non-contact, therefore there is no added mass of the sensors to the structure. The structure is acoustically excited with a pure sine signal that is tuned to each resonant frequency. A single response measurement with the Laser Doppler Vibrometer in individual points is needed to determine the modal parameters. A mass-change strategy is used for the mass-normalisation of the measured mode shapes. The main contribution of the presented method compared to other similar methods is that the mode shapes are better accentuated (due to sine excitation), which can improve the results of the modal analysis on small and light structures, where the response of the structure is weak. The method is also easy to perform, because only a single response measurement is needed for each point and the excitation force does not need to be measured. The presented method gives accurate results, which was confirmed with the comparison of the experimental and the numerical results on a sample of simple geometry.
UR  - https://www.sv-jme.eu/article/tuned-sinusoidal-method-for-operational-modal-analysis-of-small-and-light-structures/
@article{{sv-jme}{sv-jme.2013.1371},
	author = {Rovšček, D., Slavič, J., Boltežar, M.},
	title = {Tuned-sinusoidal method for operational modal analysis of small and light structures},
	journal = {Strojniški vestnik - Journal of Mechanical Engineering},
	volume = {60},
	number = {3},
	year = {2014},
	doi = {10.5545/sv-jme.2013.1371},
	url = {https://www.sv-jme.eu/article/tuned-sinusoidal-method-for-operational-modal-analysis-of-small-and-light-structures/}
}
TY  - JOUR
AU  - Rovšček, Domen 
AU  - Slavič, Janko 
AU  - Boltežar, Miha 
PY  - 2018/06/28
TI  - Tuned-sinusoidal method for operational modal analysis of small and light structures
JF  - Strojniški vestnik - Journal of Mechanical Engineering; Vol 60, No 3 (2014): Strojniški vestnik - Journal of Mechanical Engineering
DO  - 10.5545/sv-jme.2013.1371
KW  - operational modal analysis, tuned-sinusoidal method, mode shape normalisation, small and light structures, single response, acoustic excitation
N2  - Small and light structures have some distinctive features that intensify the difficulties of measuring their modal parameters. The mass that is added to the structure by the sensors cannot be neglected and the resonant frequencies are usually relatively high, therefore a wide frequency range of measurement is needed. There are also difficulties with assuring the proper excitation, so that all the measured modes are excited well and that at the same time the excitation level is not too large, which would cause larger response of the structure than the measuring ranges of the sensors can cover. In this study an innovative method for operational modal analysis of small and light structures is presented. The method is non-contact, therefore there is no added mass of the sensors to the structure. The structure is acoustically excited with a pure sine signal that is tuned to each resonant frequency. A single response measurement with the Laser Doppler Vibrometer in individual points is needed to determine the modal parameters. A mass-change strategy is used for the mass-normalisation of the measured mode shapes. The main contribution of the presented method compared to other similar methods is that the mode shapes are better accentuated (due to sine excitation), which can improve the results of the modal analysis on small and light structures, where the response of the structure is weak. The method is also easy to perform, because only a single response measurement is needed for each point and the excitation force does not need to be measured. The presented method gives accurate results, which was confirmed with the comparison of the experimental and the numerical results on a sample of simple geometry.
UR  - https://www.sv-jme.eu/article/tuned-sinusoidal-method-for-operational-modal-analysis-of-small-and-light-structures/
Rovšček, Domen, Slavič, Janko, AND Boltežar, Miha.
"Tuned-sinusoidal method for operational modal analysis of small and light structures" Strojniški vestnik - Journal of Mechanical Engineering [Online], Volume 60 Number 3 (28 June 2018)

Authors

Affiliations

  • University of Ljubljana, Faculty of Mechanical Engineering, Laboratory for Dynamics of Machines and Structures, Slovenia
  • University of Ljubljana, Faculty of Mechanical Engineering, Laboratory for Dynamics of Machines and Structures, Slovenia
  • University of Ljubljana, Faculty of Mechanical Engineering, Laboratory for Dynamics of Machines and Structures, Slovenia

Paper's information

Strojniški vestnik - Journal of Mechanical Engineering 60(2014)3, 187-194

10.5545/sv-jme.2013.1371

Small and light structures have some distinctive features that intensify the difficulties of measuring their modal parameters. The mass that is added to the structure by the sensors cannot be neglected and the resonant frequencies are usually relatively high, therefore a wide frequency range of measurement is needed. There are also difficulties with assuring the proper excitation, so that all the measured modes are excited well and that at the same time the excitation level is not too large, which would cause larger response of the structure than the measuring ranges of the sensors can cover. In this study an innovative method for operational modal analysis of small and light structures is presented. The method is non-contact, therefore there is no added mass of the sensors to the structure. The structure is acoustically excited with a pure sine signal that is tuned to each resonant frequency. A single response measurement with the Laser Doppler Vibrometer in individual points is needed to determine the modal parameters. A mass-change strategy is used for the mass-normalisation of the measured mode shapes. The main contribution of the presented method compared to other similar methods is that the mode shapes are better accentuated (due to sine excitation), which can improve the results of the modal analysis on small and light structures, where the response of the structure is weak. The method is also easy to perform, because only a single response measurement is needed for each point and the excitation force does not need to be measured. The presented method gives accurate results, which was confirmed with the comparison of the experimental and the numerical results on a sample of simple geometry.

operational modal analysis; tuned-sinusoidal method; mode shape normalisation; small and light structures; single response; acoustic excitation