ABSTRACT
Varied welding process parameters result in different welding residual stress and deformation, thereby changing the structural dynamic characteristics, which will significantly impact structural vibration and acoustic radiation. To investigate the influence of different welding process parameters on the acoustic and vibration characteristics, several experiments of the stiffened plate structure were carried out regarding the modal, underwater vibration, and acoustic radiation under different welding process parameters. The results reveal that welding energy input has the most significant impact on the first-order natural frequency, and with the increase of welding energy input, the impact first becomes higher and then lower. The welding energy input has relatively little effect on the peak point distribution of vibration and acoustic radiation curve, but it will affect the peak point amplitude. With the increase of welding energy input, the total level of structural vibration and sound radiation frequency band will first decrease and then increase. The best result is obtained when the welding current is set to 200A, the welding voltage 25V, the welding speed 3.02-3.06mm/s, and the welding energy input 167J/cm. This research can provide a reference for improving the acoustic stealth performance of ships and marine structures based on construction technology.
