Preface Special Topics in Structural Dynamics & Experimental Techniques represents one of nine volumes of technical papers presented at the thirty-ninth IMAC, A Conference and Exposition on Structural Dynamics, organized by the Society for Experimental Mechanics, and held between February 8 and 11, 2021. The full proceedings also include volumes on nonlinear structures and systems; dynamics of civil structures; model validation and uncertainty quantification; dynamic substructures; rotating machinery, optical methods, and scanning ldv methods; sensors and instrumentation, aircraft/aerospace, energy harvesting, and dynamic environments testing; topics in modal analysis and parameter identification; and data science in engineering. Each collection presents early findings from experimental and computational investigations on an important area within structural dynamics. Special Topics in Structural Dynamics & Experimental Techniques represents papers highlighting new advances and enabling technologies for experimental techniques, finite element techniques, system identification, and additive manufacturing. The organizers would like to thank the authors, presenters, session organizers, and session chairs for their participation in this track. Albuquerque, NM, USA David S. Epp v
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