ASD规范和数字化客户服务产品定义

简要介绍了欧洲宇航和防务工业协会ASD(Aerospace and Defence Industries Association of Europe)系列标准以及在数字化客户服务产品定义中的应用.     

飞机技术状态管理系统文档管理模型的研究

文档管理是PDM的核心,一般建立在关系数据库系统的基础上。主要保证数据的安全性和完整性。并支持各种查询与检索功能。通过建立在数据之上的相关联指针。建立不同类型的或异构的产品数据之间的联系,实现文档的层次与联系控制。本文就“飞机技术状态管理系统”的文档管理模型作初步的探讨。     

基于卫星质保体系的神经网络模型

针对质保体系基础上的卫星产品保证管理，应用多层前馈神经网络原理和方法，建立了基于无卫星产品保证要求的质保体系与基于卫星产品保证要求的质保体系神经网络模型，以用神经网络模来模拟和控制卫星产品的质量水平；并用模比较了两种质保体系的联系与区别。     

卫星产品保证体系模糊综合评价模型

为了阐述产品保证体系的概念和思想，建立了产品保证体系的模型。为评价卫星产品保证体系对卫星产品质量保证情况，应用模糊综合评判原理建立卫星产品保证体系模糊综合评价模型。运用该产品保证体系模糊综合评判模型对某一具体卫星型号的产品保证情况进行了评价，并对计算结果进行了分析。计算结果与实际情况的一致性较好，证明了该模型及评价方法的可靠性和有效性。     

如何实施产品研制过程的计量评审

按照国家标准ＧＢ／Ｔ１９０２２．１（ＩＳＯ１００１２－１）《测量设备的计量确认体系》的要求，就如何开展产品研制过程的计量评审工作，提供了一种具有可操作性的方法，可供产品研制单位制定计量评审程序时参考。     

构建民用航空产品研制工程技术体系的探讨

从商用航空产品市场客户特性决定了商用航空产品产业链向下游延伸的事实出发,说明商用航空产品研制的工程技术体系不应该简单借用军用产品研制的经验,而要从全产业链的工程技术活动出发,创建适合自身需求的新的工程技术体系,特别是在数字化时代,对产品数据包和产品研制数据流动要有新的认识,以求更科学有效地涵盖产品全寿命期,以包括设计、制造和服务三大技术分体系在内的产品工程技术体系运作来替代传统意识下的仅以设计为内涵的产品研制技术体系运作,保障商用航空产品研制的成功。     

提高产品装配互换协调性的措施

根据某产品制造和使用过程的协调互换需求,对该产品结构设计及制造提出了一些改进措施,以提高该产品装配互换协调性。     

Improving performance of macro electrolyte jet machining of TC4 titanium alloy: Experimental and numerical studies

Electrolyte jet machining (EJM) is a promising method for shaping titanium alloys due to its lack of tool wear, thermal and residual stress, and cracks and burrs. Recently, macro-EJM has attracted increasing attention for its high efficiency in machining wide grooves or planes. However, macro-EJM generates large amounts of electrolytic products, thereby increasing the difficulty of rapid product removal with a standard tool and reducing the surface quality. Therefore, for enhanced product transport, a novel tool with a back inclined end face was proposed for macro-EJM of TC4 titanium alloy. For comparison, also proposed were ones with a standard flat end face, a front inclined end face, and both front and back inclined end faces. The flow field distributions of all proposed tools were simulated numerically, and experiments were also conducted to validate the simulation results. The results show that one with a 5° back inclined end face can decrease the low-velocity flow zone in the machining area and increase the high-velocity flow zone at the back end of tool, thereby promoting rapid product removal. A relatively smooth bright-white groove surface was obtained. The same tool also resulted in the highest machining depth and material removal rate among the tested ones. In addition, rapid product removal was beneficial to the subsequent processing. Because of its rapid product removal, the machining depth and material removal rate during deep groove machining using the tool with a 5° back inclined end face were respectively 7% and 14% higher than those produced using a standard one. Moreover, the lowest bottom height difference of 0.027 mm can be obtained when the step-over value was 8.2 mm, and a plane with a depth of 0.285 mm and a bottom height difference of 0.03 mm was fabricated using the tool with a 5° back inclined end face.