This first of three volumes includes papers from the second series of NODYCON, which was held virtually in February of 2021. The conference papers reflect a broad coverage of topics in nonlinear dynamics, ranging from traditional topics from established streams of research to  those from  relatively unexplored and emerging venues of research. These include







Fluid-structure interactions         
Mechanical systems and structures        
Computational nonlinear dynamics        
Analytical techniques                 
Bifurcation and dynamic instability        
Rotating systems 
Modal interactions and energy transfer
Nonsmooth systems