This second 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 -         Nonlinear vibration control  -         Control of nonlinear systems and synchronization -         Experimental dynamics        -         System identification and SHM        -         Multibody dynamics