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