焊接残余应力对环肋圆柱壳水下声辐射影响研究

文章重点研究了焊接残余应力对环肋圆柱壳水下声辐射的影响。通过运用热弹塑性有限元法数值模拟环肋圆柱壳对接焊接过程，得到厚板环形焊缝的三维残余应力场和应变场，然后对含有残余应力的环肋圆柱壳动力特性进行研究，并运用有限元法和边界元法分析了低频激励下其水下声辐射的特点。研究结果表明焊接残余应力对环肋圆柱壳声辐射有较明显的影响，不仅使声辐射功率曲线和外场声压曲线向低频移动，而且使在大部分激励频率上含有焊接残余应力结构的声辐射功率和外场声压均大于无焊接残余应力结构。

Influence of welding-induced residual stress on underwater acoustic radiation of ring stiffened cylindrical shell

This paper focuses on the influence of welding residual stress on underwater acoustic radiation of ring stiffened cylindrical shell. The thermal elastic-plastic finite element method is used to simulate ring stiffened cylindrical shell butt welding process and to calculate the three-dimensional welding-induced residual stress and strain field. And the dynamic characteristic of ring stiffened cylindrical shell with residu-al stress is investigated. Finally, its acoustic radiation is solved by combining direct boundary element method with finite element method. The results show that residual stress has a significant impact on underwater a-coustic radiation of ring stiffened cylindrical shell under low frequency excitation. It makes acoustic radia-tion power and sound pressure curve integrally move toward lower frequency, and makes acoustic radiation power and sound pressure increase at most excitation frequencies comparing with structure without residual stress.