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