Mode shapes extraction by time domain decomposition (TDD)

Version 2.5 (3.97 MB) by E. Cheynet
The modal parameters of a line-like structure are estimated in the time domain using displacement records only.
2.8K Downloads
Updated 8 May 2020

Mode shapes extraction by time domain decomposition (TDD)

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Summary

The Time domain decomposition (TDD) [1] is an output-only method to extract mode shapes of a structure. Here, the modal damping ratios and modal displacements are in addition extracted using the functions presented in [6]. The TDD is similar to a more popular technique called Frequency-domain method (FDD) that was introduced by [2,3]. A good example of the FDD already exists on the Matlab File Exchange [4]. In a previous version, the present submission contained a function for the FDD. This function has been modified and moved to a new submission [5].

Content

The submission contains:

  • The function TDD.m: function to apply the TDD method.
  • An example file Example1.m
  • Acceleration data beamData.m (4 Mb)

References

[1] Byeong Hwa Kim, Norris Stubbs, Taehyo Park, A new method to extract modal parameters using output-only responses, Journal of Sound and Vibration, Volume 282, Issues 1–2, 6 April 2005, Pages 215-230, ISSN 0022-460X, http://dx.doi.org/10.1016/j.jsv.2004.02.026.

[2] Brincker, R.; Zhang, L.; Andersen, P. (2001). "Modal identification of output-only systems using frequency domain decomposition". Smart Materials and Structures 10 (3): 441. doi:10.1088/0964-1726/10/3/303.

[3] BRINCKER, Rune, ZHANG, Lingmi, et ANDERSEN, P. Modal identification from ambient responses using frequency domain decomposition. In: Proc. of the 18*‘International Modal Analysis Conference (IMAC), San Antonio, Texas. 2000

[4] http://www.mathworks.com/matlabcentral/fileexchange/50988-frequency-domain-decomposition--fdd-

[5] https://se.mathworks.com/matlabcentral/fileexchange/57153-automated-frequency-domain-decomposition--afdd-

[6] https://se.mathworks.com/matlabcentral/fileexchange/55557-modal-parameters-identification-from-ambient-vibrations--sdof

Cite As

E. Cheynet (2024). Mode shapes extraction by time domain decomposition (TDD) (https://github.com/ECheynet/TDD/releases/tag/v2.5), GitHub. Retrieved .

E. Cheynet. ECheynet/TDD: Mode Shapes Extraction by Time Domain Decomposition (TDD). Zenodo, 2020, doi:10.5281/ZENODO.3817999.

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MATLAB Release Compatibility
Created with R2018a
Compatible with any release
Platform Compatibility
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Version Published Release Notes
2.5

See release notes for this release on GitHub: https://github.com/ECheynet/TDD/releases/tag/v2.5

2.4

Added project website

2.3

Updated example and functions inputs/outputs

2.2.0.0

Example file contains one more figure

2.1.0.0

typo

2.0.0.0

typo
Major changes: The example file and TDD.m function are simplified. The modal damping ratio are now calculated. The code for FDD has been moved to File ID: #57153
Description

1.0.0.0

-typo + picture
MathWorks update: Added Live Script.

To view or report issues in this GitHub add-on, visit the GitHub Repository.
To view or report issues in this GitHub add-on, visit the GitHub Repository.