Updated 08 May 2020
The Time domain decomposition (TDD)  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 . 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 . In a previous version, the present submission contained a function for the FDD. This function has been modified and moved to a new submission .
The submission contains:
 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.
 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.
 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 (2021). 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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