中文摘要：

再制造曲轴径向跳动不确定性是影响再制造发动机质量稳定性和服役安全性的关键因素之一。从回收废旧曲轴失效形式不同、再制造修复工艺各异导致径向跳动存在差异的角度,分析再制造曲轴径向跳动不确定性的内涵;根据径向跳动不确定性产生的原因将其归结为随机不确定性和模糊不确定性;应用＂随机熵＂测度径向跳动的随机不确定性,运用＂模糊熵＂测度径向跳动的模糊不确定性,建立基于积空间P×M的复合熵模型,定量化描述曲轴径向跳动的整体不确定度;以某重型发动机再制造企业WD615系列68型曲轴再制造为例,对测度方法进行实例验证,结果证明了方法的有效性和实用性,研究内容为再制造不确定优化决策提供了理论依据。

英文摘要：

The uncertainty of radial runout of remanufactured crankshaft is a key factor affecting the quality and the safety of the remanufactured engine. First, the connotation of radial runout＇s uncertainty of the remanufactured crankshaft journal is analyzed, based on the failure mode of the recycled scrap crankshafts and the diversity of the uncertainty of radial runout which is caused by different remanufacturing repair technology. The uncertainty of the radial runout is classified into random uncertainty and fuzzy uncertainty based on the reasons of the uncertainty of radial runout. Then, ＂random entropy＂ is used to measure the random uncertainty and ＂fuzzy entropy＂ is applied to measure the fuzzy uncertainty of radial runout respectively. A composite entropy model based on product space P×M is built to quantitatively describe the overall uncertainty of radial runout of crankshaft. Last, the verification of the measure methods is carried out with the WD615 series 68 crankshaft remanufacturing of a heavy duty engine remanufacturing enterprise as example, it is shown that the methods are effective and feasible. This research provides a theoretical basis for the decision-making of remanufacturing uncertainty optimization.