Mode shapes extraction by time domain decomposition (TDD)

バージョン 2.5 (3.82 MB) 作成者: E. Cheynet
The modal parameters of a line-like structure are estimated in the time domain using displacement records only.

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更新 2020/5/8

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Mode shapes extraction by time domain decomposition (TDD)

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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].


The submission contains:

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


[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,

[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





E. Cheynet (2022). Mode shapes extraction by time domain decomposition (TDD) (, GitHub. 取得済み .

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

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