大型船舶加筋板结构焊接裂纹在线检测研究  

Research on online detection of welding cracks in reinforced plate structures of large ships

作　　者：宋敏霞[1] SONG Min-xia(Changzhou University,Changzhou 213164,China)

机构地区：[1]常州大学,江苏常州213164

出　　处：《舰船科学技术》2024年第6期157-160,共4页Ship Science and Technology

摘　　要：大型船舶加筋板结构焊接若出现裂纹,会降低加筋板结构强度,为船舶航行安全带来不可预估的风险,为此研究大型船舶加筋板结构焊接裂纹在线检测方法。使用有限元软件Ansys,依据船舶加筋板结构参数,对加筋板结构焊接裂纹模态进行模拟,获取大型船舶加筋板结构焊接裂纹模态,依据该模态,使用改进连续小波分解方式从加筋板结构焊接裂纹模态中获取裂纹对应的小波系数,通过获取裂纹模态小波系数突变点,依据该突变点得到加筋板结构焊接裂纹深度、长度、宽度等在线检测结果。实验结果表明,该方法可有效获取船舶加筋板结构焊接裂纹模态,并依据该模态在线检测到船舶加筋板结构焊接裂纹的长度、宽度等,应用效果较佳。If cracks appear in the welding of reinforced plate structures on large ships,it will reduce the strength of the reinforced plate structure and bring unpredictable risks to ship navigation safety.Therefore,an online detection method for welding cracks in reinforced plate structures on large ships is studied.This method uses finite element software Ansys to simulate the welding crack mode of the stiffened plate structure based on the structural parameters of the ship's stiffened plate,and obtains the welding crack mode of the large ship's stiffened plate structure.Based on this mode,an improved continuous wavelet decomposition method is used to obtain the wavelet coefficients corresponding to the cracks from the welding crack mode of the stiffened plate structure.By obtaining the mutation point of the wavelet coefficients of the crack mode,Obtain online detection results for the depth,length,and width of welding cracks in the reinforced plate structure based on this mutation point.The experimental results show that this method can effectively obtain the mode of welding cracks in ship reinforced plate structures,and based on this mode,the length and width of welding cracks in ship reinforced plate structures can be detected online,with better application effects.

关 键 词：大型船舶 加筋板 结构焊接 裂纹在线检测 振动模态 小波变换 

分 类 号：TP391[自动化与计算机技术—计算机应用技术]