中文摘要：

装配特征之间的变动解析是产品装配偏差累积分析的重要基础，针对现有研究成果未考虑零件间装配特征定位顺序对配合间隙影响的问题，提出一种定位优先级约束下间隙配合的变动解析模型与装配成功率计算方法。建立了两个零件之间多基准装配的数学模型，并分析装配特征在配合前相对于装配名义位置的变动。通过对平行平面配合、圆柱面配合、圆锥面配合以及球面配合等四类间隙配合的接触状态进行分析，得到装配基准特征与装配目标特征在配合后相对装配名义位置变动所需满足的约束条件。在此基础上提出定位优先级约束下的装配特征之间的配合变动算法，并给出包含多组装配特征配合的两零件之间的装配成功率的计算方法。以一种测量仪器结构的装配为实例，验证了上述方法的可行性。

英文摘要：

Analysis of variation between assembly features is fundamental to analysis of assembly variation. Orienting to affection of location sequence on clearance fits between assembly features of two parts, an analytical model for fit variation and a computation method for assembly success rate are proposed. A mathematical model for multi-datum assembly is established to analyze variation of assembly features with relative to nominal position before mating. Then, based on contact relationship between parallel planes or cylinders or cones or spheres, constraint conditions on variation of assembly features after mating are obtained. The algorithm to compute fitting variation between assembly features is proposed and the method to obtain assembly success rate between two parts is presented as well. Afterward, through simulating variation of assembly features randomly based on given constraint conditions, fit variation and assembly success rate can be derived. A measurement instrument is illustrated as example to prove feasibility of the proposed model and method.