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