Influence of welding residual stress on dynamic and acoustic behavior of typical ship structures

Abstract

ObjectiveWelding is a common method for connecting ship structures, but it obviously affects their acoustic and vibration characteristics. Thus, it is necessary to study the influence of welding process parameters on the acoustic and vibration characteristics of structures. MethodIn this paper, the thermo-elastoplastic finite element method and acoustic-structure coupling finite element method are combined to study the influence of welding parameters on the acoustic and vibration characteristics of typical ship stiffened plate structures. ResultsThe results show that welding residual stress is significantly affected by welding input power and speed. Higher welding input power and lower welding speeds both result in a larger welding residual stress distribution range which causes changes to the natural frequency, vibration response and radiated sound pressure of typical stiffened plate structures. ConclusionWelding residual stress should be analyzed to determine the acoustic and vibration response of low-damping welded structures, thereby providing guidance for the formulation of low-noise welding processes.

Keywords

• stiffened plate
• welding residual stress
• vibration and sound radiation