模糊FMECA在高速列车转向架轮对故障分析中的应用

为确定高速列车转向架轮对系统中的关键零部件及其故障模式,引入模糊综合评判和层次分析法对传统故障模式影响与危害度分析方法进行改进,形成模糊故障模式影响与危害分析方法,降低评价过程的主观影响,优化评估结果。通过定量分析轮对零部件故障模式的危害度,并对其进行排序比较,得到各零部件以及故障模式的相对重要度,为后续转向架轮对系统的可靠性分配和维修中的故障检测和诊断提供参考。     

Study on DSM-based task planning of product cooperative development

The results of analyzing the managerial characteristics and complexity of product cooperative development suggest that task planning is an important aspect for process management of product cooperative development and the method for planning tasks should be able to model the dependency between tasks and iterations during the development process. In this paper, a DSM-based method and its corresponding optimization algorithms are developed. At first the coupled task sets and uncoupled task sets are identified, and the tasks are then optimized by the corresponding algorithms. The optimal tasks plan will reduce the development time and cost. Considering the practical requirements in real world, a Multilayer DSM is proposed, and its information communication techniques between DSM and traversing principle are described in details.     

基于动作元的汽车离合器操纵舒适性的优化

针对实际设计过程中难以定量地评定离合器操纵舒适性等问题,首先根据操纵装置各种设计因素与人体动作的映射关系,引入动作元概念模型,并采用动作元矩阵来描述汽车离合器操纵过程,通过实际动作元矩阵与设计目标矩阵的贴近度来衡量离合器的操纵舒适性程度;然后,在对液压式离合器工作原理进行分析的基础上,建立汽车液压式离合器操纵舒适性的数学模型和优化模型,并进行优化;最后,通过实例验证该方法的可行性.