中文摘要：

金属薄板零件广泛应用于汽车车身等产品中，由于影响系数法在薄板件的装配过程中不能精确分析零件偏差和装配偏差之间的关系，提出一种基于功平衡法的柔性薄板零件装配偏差分析模型。应用两个厚度不同的悬臂梁研究零件在焊接过程中的偏差变化，经分析可知焊接过程中焊枪做功相同，以此为基础建立零件偏差和装配偏差之间的基于功平衡法敏感系数矩阵。最后应用Z型薄板零件阐述了装配偏差分析过程，结果表明功平衡装配偏差分析模型的精确性。

英文摘要：

Sheet metal parts are widely used in automobile body and other products. In the assembly process of sheet metal parts as the influence coefficient method cannot accurately analyze the relationship between parts deviation and the assembling deviation, it proposes assembling variation analysis model based on a power balance method for beam. The deviation of parts is analyzed in the welding process using two beams of different thickness. The analysis shows that the weld gun does same work in the process of welding. On this basis, it establishes the sensitive coefficient matrices between parts deviation and assembling deviation. Finally, the assembling deviation analysis process is illustrated by using Z type sheet metal parts and the results indicate the accuracy of the power balance assembling deviation analysis model.