Vibration suppressing study of a simplified floating raft system by mixing using a nonlinear connecting intercalary plate and connecting nonlinear oscillators

To study the potential application of the mixing nonlinear vibration suppression of the floating raft system, a hybrid vibration control model of the simplified floating raft system with the nonlinear connecting intercalary plate (NCIP) and connecting nonlinear oscillators (CNOs) is established. Based on the correct dynamic behavior of the simplified floating raft system with the NCIP and CNOs, the vibration-suppressing characteristics and vibration-suppressing effect of the simplified floating raft system by mixing using the NCIP and CNOs are deeply studied and discussed. It can be found that the mixing use of the NCIP and CNOs can combine their advantages in an attractive way. The working states of the mixing use of the NCIP and CNOs are divided into linear and non-linear multiple frequency bands synchronously suppressing states, where the vibration island phenomenon is a sign of the NCIP and CNOs work on the non-linear state. Besides, the vibration of the simplified floating raft system under resonance regions can be suppressed at an attractive level, where the best vibration-suppressing ratios for single resonance regions and multiple resonance regions of the simplified floating raft system can be reached by selecting suitable stiffness parameter combinations of the NCIP and CNOs. Overall, the global vibration of the simplified floating raft system within a targeted frequency band can be suppressed synchronously and effectively by reasonable mixing use of the NCIP and CNOs, which play a potential role in the engineering application of strengthening the vibration-suppressing effect of floating raft systems in marine engineering.