中文摘要：

针对船体主板装焊过程中形成的偏差流影响装配质量问题，分析了零件几何形位偏差、零件定位偏差、对接焊偏差和重定位偏差这四类偏差，结合上述偏差在工位之间的变化、累积与传递规律，在三维坐标系中以零件参考点偏差作为状态向量，零件测量点偏差作为输出向量，利用状态空间模型构建数学表达式；利用Ansys和Matlab软件，通过多元线性回归分析，着重分析定位偏差与对接焊产生的焊接偏差之间的关系，掌握了偏差影响装配质量的规律．最后利用某造船厂实际主板的装焊过程为例进行验证，表明该模型对船体主板精度控制是有效的．

英文摘要：

The paper focuses on the variation propagation of the hull mainboard assembly which affects the assembly quality in shipbuilding. Firstly, we analyze the part geometry error, part-locating error, butt-jointing welding deformation error and relocation error. Considering the regularity that these dimensional variations change, stack-up and propagate between stations when the process goes through , a mathematical expression is established based on state space model, which uses reference point＇s variations of parts as the state vector and measurement points＇variations as the output vector in a three-dimensional coordinate system,. Then, multi-variant linear regression analysis through softeware Ansys and Matlab is developed to analyze the relationship between part locating error and buttjoint welding deformation error and thereby the rule of error influencing the assembly quality is obtained. Finally, a case study presented on variation propagation in a real hull mainboard welding assembly process of a shipyard provides evidence of the application and validity of the model.