Stability And Dynamic Analysis Of Wave Adaptive Rescue Vessel

With the rapid development of marine exploration activities,more attention is paid to the salvage and rescue capability.As the main equipment of China's marine salvage and rescue,it is crucial to development rescue vessels,especially high-performance emergency rescue vessels.The Wave Adaptive Module Vessel(WAM-V)is a new type of ship that can adapt to various sea state.This paper analysis the stability and multi-body dynamics of the Wave Adaptive Rescue Vessel developed by Dalian Maritime University,and studies the factors that affect its anti-overturning ability and the damping effect of the top platform.The above researches provide theoretical basis to improve the follow-up design.The theoretical analysis of the initial and large angle stability of vessel is carried out,and the values of the initial stability height and righting arm of the vessel are calculated by the Maxsurf software,which are compared with the requirements of the standard stability of ordinary ships.On this basis,the variation laws of the static stability arm curve under different values of the buoy diameter,buoy spacing,center of gravity and other parameters are analyzed,and the influence on the stability of the vessel at large inclined angle is analyzed.Before the multi-body dynamics analysis,the wave theory is studied,and the wave functions in the roll,pitch,and heave directions are derived and used as the input load.Based on ADAMS and ANSYS software,a rigid-flexible coupled multi-body dynamics simulation model considering the deformation of the buoy due to wave impact is established.The simulation results are compared with the acceleration and displacement data collected by the experiment to verify the correctness of the simulation.The dynamic model is simulated and optimized under the condition of inputting three degrees of freedom wave motion load,and the spring stiffness and damping coefficients of the vibration reduction system are used as design variables.The root mean square of heave acceleration is determined as the objective function.Carry out optimization simulation in ADAMS to get the best combination of stiffness and damping coefficients.Using the optimized vibration damping system parameters,the root mean square value of the ship's heave acceleration is reduced by 29.3%,and the improvement of the stiffness and damping coefficients on the vessel vibration reduction performance is verified.