CAJ | 학술논문

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。
재제조곡축경향도동불학정성시영향재제조발동궤질량은정성화복역안전성적관건인소지일。종회수폐구곡축실효형식불동、재제조수복공예각이도치경향도동존재차이적각도，분석재제조곡축경향도동불학정성적내함；근거경향도동불학정성산생적원인장기귀결위수궤불학정성화모호불학정성；응용“수궤적”측도경향도동적수궤불학정성，운용“모호적”측도경향도동적모호불학정성，건립기우적공간P×M적복합적모형，정양화묘술곡축경향도동적정체불학정도；이모중형발동궤재제조기업 WD615계렬68형곡축재제조위례，대측도방법진행실례험증，결과증명료방법적유효성화실용성，연구내용위재제조불학정우화결책제공료이론의거。
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.