Anti-resonance vibration isolation analysis of shafting longitudinal vibration under elastic coupling of hull

Objectives The resonance changer （RC） is designed under rigid boundary condition and then applied to the elastic coupling boundary condition. This paper explores the influence of changes in boundary conditions on RC parameter design and its vibration reduction effect.Methods Considering the characteristics of the shafting rotor, a dynamic model of a shafting-hull coupling system with a RC is established. Based on the transfer matrix method, the vibration and force transfer characteristics of the system are analyzed. The structural parameters of the RC are designed according to the shafting longitudinal vibration characteristics under rigid boundary conditions, then applied to the hull.Results The results show the feasibility of the above parameter design and application scheme. The influence of the anti-resonance vibration isolation mechanism on the system can be divided into the stiffness region, anti-resonance region and mass region. Through sensitivity analysis, it is proposed that the structural parameters of the RC are adjustable.Conclusions The results of this study can provide valuable references for the application of RC to full-sized ships.