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Toward Optimizing Dynamic Characteristics of Non-conventional TMDs in Multi-degree-of-Freedom Systems

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Abstract

This study proposes a new method toward optimizing the design of non-conventional tuned mass dampers in multi-degree-of-freedom systems. An important application of the proposed method is in mega-sub-controlled structures in which the seismic vibration of the system is controlled by using isolated sub-structures. The method estimates the optimum parameters of the sub-structures including frequency ratio and damping ratio based on formulations derived for optimal design of SDOF systems with tuned mass dampers. The method is verified by comparing the results with a numerical method. It is shown that the proposed method returns the optimum parameters with acceptable accuracy (less than 5% difference from numerical results), and in some cases the results are identical to the numerical method. In the final part, the method is applied to three mega-structures with different control systems in order to examine its accuracy in predicting the optimum parameters of the non-conventional tuned mass dampers. It is concluded that the method is efficient and can be used for optimal design of such systems.

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Author information

Correspondence to Leila Zebarjad.

Appendix

Appendix

See Table 6.

Table 6 Optimum tuning parameters of the TMD for SDOF structure

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Yahyai, M., Zebarjad, L., Head, M. et al. Toward Optimizing Dynamic Characteristics of Non-conventional TMDs in Multi-degree-of-Freedom Systems. Iran J Sci Technol Trans Civ Eng (2020) doi:10.1007/s40996-019-00338-z

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Keywords

  • Non-conventional TMDs
  • Mega-sub-control structure
  • Optimum properties
  • Frequency
  • Damping