基于粗糙集的涡轴发动机型号发展综合评估决策模型

根据新型号涡轴发动机质量要求,综合考虑系统设计与用户需求,以指标体系构建方法为指导,构建涡轴发动机型号发展评估指标体系。运用粗糙集理论对世界上典型的同类型涡轴发动机的各种指标进行数据挖掘,利用信息熵方法求出各指标的权重值,克服了传统主观赋权法的随意性与客观构权时可能存在的偏差。最后,建立涡轴发动机型号发展综合评价决策模型并用实例证明了这种方法的可行性。     

基于Choquet模糊积分的物流网络二阶段设计方法

为弥补加法型方法对指标相对独立性和指标间不存在相互作用的假定，应用模糊测度及Choquet模糊积分，并结合模糊集理论、0—1整数规划提出了物流企业设施网络设计的二阶段方法：首先利用Choquet模糊积分对单个物流设施进行多指标评价，然后再考虑物流设施的模糊建设成本、模糊业务量和容量约束建立模糊整数规划，经过求解模糊规划模型而获得最佳的物流设施网络。最后应用案例验证了该设计方法的有效性。     

货车车轮残余应力的产生与分布研究

受研究方法和测试手段的限制,货车车轮在生产过程中产生的残余应力状态与分布很难测试,仅能按照有关标准进行残余应力趋势测定。本文采用数值模拟和实测法相结合的手段,研究了车轮在热处理全过程中的温度场、组织场、应力场的变化和分布以及车轮出厂前的残余应力分布状态,分析了车轮残余应力产生的原因,并研究了不同生产工艺参数对残余应力的影响。     

船用燃气轮机涡轮轮盘拉削工艺研究

分析船用燃气轮机涡轮盘榫槽拉削工艺中的拉床选定、轮槽拉的确定、拉夹具的维修等技术要点,实现涡轮轮盘榫槽的合理拉削加工,探讨解决涡轮轮盘榫槽加工的各种难题。     

基于粗集的转向架故障诊断研究

转向架故障诊断是客车行车安全监测的一个重要方面。针对转向架故障诊断困难的现状，现将基于粗集的数据挖掘方法应用于转向架故障诊断中，介绍了基于粗集的转向架故障诊断过程和应用实例。通过粗集的约简算法，挖掘出影响转向架故障的关键特征和知识，放于专家库中，按照专家库中的知识进行转向架故障诊断。该方法对监测转向架的运行状态、诊断转向架故障具有重要意义。     

Mist-jetting Electrical Discharge Dressing Technology for Superabrasive Grinding Wheels

The technology of superabrasive grinding has been developed in order to achieve high-quality finish in extremely hard and brittle materials.Thereafter, truing and dressing technology on super abrasive grinding wheel is one of the most important subjects on precise machining field at present.In this paper, mist-jetting electrical discharge technology was applied to dressing metal-bonded superabrasive wheels.And a systematical study on the mechanism of selective removal of the bond was proposed.Experiments on dressing bronze bonded diamond grind wheels were carried out on a die-sinking electrical discharge machine.The diamond wheel topographies before and after electrical discharge dressing were observed by VH-800 3D digital microscope.The wheel profiles before and after dressing were observed.The results of electrical discharge dressing under different electrical parameters were compared.Experimental results indicate that the favorable surface topography can be obtained under suitable processing parameters and mist-jetting electrical discharge dressing(MEDD) is feasible for metal-bonded diamond grinding wheel.     

镁铝合金车轮胶栓复合连接稳健性优化设计

提出了车轮胶栓复合连接的多目标确定性与稳健性优化设计方法。首先,建立镁铝合金组装式车轮螺栓连接有限元模型,对其进行弯曲疲劳寿命仿真,对比疲劳试验结果,验证了车轮仿真模型的准确性。随后,建立结构胶弹塑性本构模型,通过试验得到其应力应变曲线和剪切强度。最后,选取胶层厚度与种类、螺栓预紧力和螺栓孔直径为设计变量,建立车轮栓胶复合连接参数化仿真模型,以车轮连接螺栓疲劳寿命、结构胶最大拉伸和最大剪切应力为优化目标,借助ISIGHT优化平台,分别采用第二代非劣排序遗传算法(NSGA-Ⅱ)和微存档遗传算法(AMGA)对车轮胶栓连接结构进行了多目标确定性和6σ稳健性优化设计。稳健性优化后车轮连接的可靠性得到进一步提升。     

货车车轮设计

阐述了对车轮设计的改进,能对车轮的可靠性和使用寿命产生重要的影响。     

Rail vehicle wheel wear prediction: a comparison between analytical and experimental approaches

There are a number of theoretical and practical techniques to compute rail vehicle wheel wear. For instance, the Archard equation is a well-known tool to determine the worn volume in sliding contact, as a function of normal load, sliding distance and the surface hardness. Of course, the wear coefficient (called K) used in this equation to differentiate the wear models implicitly comprises the conditions that govern the contact surface. Two situations can be taken into account when considering a sliding contact in a rail vehicle wheels, particularly along a curved track: (i) when the radial force prevails the lateral tangential force, which is mainly the frictional force but before flanging and (ii) during flange contact. Also, the Archard equation is employed within the tread and flange regions separately, both the regions being of interest in this paper. A number of approaches are then used to find the distance slid. The authors compare the field test results and the outcome of the analytical approaches. When the wheel wear results acquired from the two test bogies on Iranian Railways, all technical (rigid frame bogies with new assemblies and components) and operational items were identical, except for changing the bogie orientation in the second test trial for a short period. Good agreement was found between the analytical and practical investigations.     

船舶柴油发电机组选型研究

探索一种船舶柴油发电机组选型的方法。通过船舶装备发展对柴油发电机组的性能要求的分析，得出选型的原则和依据。对主流产品进行综合的定性分析，初选出满足选型原则和依据的机组集合，再建立数学模型。用层次分析法进行定量分析．从而挑选出最合适的柴油发电机组。这种选型方法可用来指导船舶柴油发电机组选型。