面向航空发动机模具的数据管理系统研究

为解决我国航空发动机模具在设计、生产中的数字化模型管理、设计过程管理等问题。研究了基于Teamcenter Engineering v9．0的PDM系统的构建和应用，并结合产品实例对产品数据管理和流程管理的建模方法及实施要点进行了详细的阐述。提高了航空发动机生产企业的效率和信息化管理水平。     

航空发动机工艺组合件试制管理扩展研究与实践

基于航标工艺组合件定义,在航空发动机研制过程中,结合企业应用需求及实践,衍生了中间制造号并明确了其定义及主要使用场景。基于全寿命周期管理要求,定义了涉及的主要流程。从工艺规划、工艺设计、产品试制、工艺定型等方面明确了主要技术管理要求。通过多类型航空发动机产品开发实践,验证了可行性和灵敏性。并且提出了通过设制造协同将生产实践经验向产品设计单位传递的要求,通过纳入产品开发基线,共同提高产品的设计、制造质量。为航空发动机产品试制过程提供了一种灵活生产组织和节约成本的工艺管理方法。     

面向航空复杂产品生产线的快速响应制造模式研究

结合航空发动机生产管理过程的具体实践,针对现有的单项纵向快速响应制造模式不能满足发动机机匣生产线制造的需求,基于快速响应制造理念提出面向航空复杂产品生产线的快速响应制造模式。在对企业内部资源整合和生产线制造管理方式优化的基础上,从企业内部制造过程的计划、物料、工艺准备、工具工装资源协调等方面描述了生产线制造过程中的资源冲突问题,建立了航空复杂产品生产线快速响应制造模型;从技术准备系统、生产过程仿真和制造执行系统出发,构建了面向航空产品生产线快速响应制造体系架构。以某航空发动机企业的机匣生产线为例,验证了所提方法的有效性。     

基于MBD技术的航空发动机接口定义方法研究

针对传统航空发动机行业的接口定义技术,研究了基于MBD技术的航空发动机接口管控方法。基于MBD技术,可以保证航空发动机产品接口一致、唯一,保证航空发动机各部件系统基于同一个要求开展设计、制造和试验工作,可以减少设计差错、避免更改遗漏,可缩短产品的研制周期,提高产品的设计质量。     

大型客机发动机首件管理在研制过程中的应用研究

首件管理是控制航空产品生产过程质量的一个行之有效的方法。本文以如何将大型客机发动机在研制中对首件管理的要求融入军机生产研制体系,介绍了大型客机发动机首件管理工作中的创新成效和运用。     

持续改进给发动机添动力

中国航空第一集团西安航空动力控制工程公司创建于1953年，是中国航空发动机燃油及控制系统研制、生产和试验基地。公司拥有性能先进的机械加工、热表处理、锻压铸造、橡胶塑压能力和计量测试手段，具备航空航天发动机燃油系统和液压附件的设计开发和制造加工能力。产品涉及航空、航天发动机燃油控制系统和飞机液压附件、肮     

军用航空再制造发动机全寿命费用分析

军用航空发动机的全寿命管理已经贯穿在发动机的研制、生产和使用阶段,但军用航空发动机的全寿命费用仍然居高不下.从全寿命费用的角度,对军用航空发动机和军用航空再制造发动机的寿命周期、物流流程和全寿命费用构成三个方面进行对比分析,结果表明,利用再制造技术改进后的军用航空发动机可以有效地降低发动机的研制和生产费用,从而大大节省了资金,节约了资源.     

"金航ERP"助西安远东实现再次腾飞

西安远东公司隶属于中国航空工业总公司,是我国研制生产航空发动机燃油附件和自动控制系统以及精密民用机电产品的大型骨干企业,下设航空产品、民用产品、工艺研究等设计研制机构,具备完整的航空产品、民用产品专业化生产线及工模具设计制造、非标准设备设计制造能力,是中国航空工业总公司所属的大型一类工业企业,同时也是我国航空发动机自动调节装置和各类液压泵的重点科研生产基地。1999年6月,西安远东公司借力“金航ERP”,以信息化建设为契机,大大提高了企业核心竞争能力,使其产品及科技成果先后荣获国家级奖4项,获部省科技成果二等以…     

航空发动机涡轮叶片精密成形技术分析

航空发动机因为制造难度高,而且技术复杂,当前世界上也只有少数几个国家可以设计和制造航空发动机,我国逐步开始对航空发动机的设计制造进行研究,让自身的制造水平进一步提高。空心涡轮叶片是高性能航空发动机生产制造过程中的重要零部件在生产制造方面难度较大,对我国的航空制造企业产生了一定的困扰,本文重点对航空发动机涡轮叶片精密成型技术进行分析研究,以供参考。     

面向航空发动机零部件设计过程的广义版本管理研究

航空发动机零部件设计中存在许多修改设计和分析的内容，会产生大量的中间版本和各种分析数据，产品数据管理系统只管理用户提交的一些重要版本和数据，大量的中间版本和分析数据被丢失。针对产品数据管理系统的不足，提出了广义版本管理的概念，以设计过程中零件的状态为单元，组织与该状态有关的各种设计和分析数据，组成一个广义版本。分析了零件设计过程中的版本操作，并用图结构描述版本之间的关联关系和版本图的数学表示，建立了广义版本管理模型，有效地实现了面向航空发动机零部件设计过程的版本管理。     

Minimal Realization of Linear Graph Models for Multi-physics Systems

An engineering system may consist of several different types of components,belonging to such physical"domains"as mechanical,electrical,fluid,and thermal.It is t...     

INTEGRAL EQUATION METHOD＇S APPLICATION IN HOLE-EDGE STRESS OF COMPOSITE MATERIAL PLATE WITH DIFFERENT SHAPED HOLES

The strength of composite plate with different hole-shapes is always one of the most important but complicated issues in the application of the composite material. The holes will lead to mutations and discontinuity to the structure. So the hole-edge stress concentration is always a serious phenomenon. And the phenomenon makes the structure strength decrease very quickly to form dangerous weak points. Most partial damage begins from these weak points. According to the complex variable functions theory, the accurate boundary condition of composite plate with different hole-shapes is founded by conformal mapping method to settle the boundary condition problem of complex hole-shapes. Composite plate with commonly hole-shapes in engineering is studied by several complex variable stress fimction. The boundary integral equations are founded based on exact boundary conditions. Then the exact hole-edge stress analytic solution of composite plate with rectangle holes and wing manholes is resolved. Both of offset axis loadings and its influences on the stress concentration coefficient of the hole-edge are discussed. And comparisons of different loads along various offset axis on the hole-edge stress distribution of orthotropic plate with rectangle hole or wing manhole are made. It can be concluded that hole-edge with continuous variable curvatures might help to decrease the stress concentration coefficient; and smaller angle of outer load and fiber can decrease the stress peak value.     

Non-monotonic material contrast in scanning ion and scanning electron images

30 keV Ga⁺ focused ion beam induced secondary electron (iSE) imaging was used to determine the relative contrast between several materials. The iSE signal compared from C, Si, Al, Ti, Cr, Ni, Cu, Mo, Ag, and W metal layers does not decrease with an increase in target atomic number Z₂, and shows a non-monotonic relationship between contrast and Z₂. The non-monotonic relationship is attributed to periodic fluctuations of the stopping power and sputter yield inherent to the ion–solid interactions. In addition, material contrast from electron-induced secondary electron (eSE) and backscattered electron (BSE) images using scanning electron microscopy (SEM) also shows non-monotonic contrast as a function of Z₂, following the periodic behavior of the stopping power for electron–solid interactions. A comparison of the iSE and eSE results shows similar relative contrast between the metal layers, and not complementary contrast as conventionally understood. These similarities in the contrast behavior can be attributed to similarities in the periodic and non-monotonic function defined by incident particle–solid interaction theory.     

Application of Feature Extraction through Convolution Neural Networks and SVM Classifier for Robust Grading of Apples

This paper proposes a novel grading method of apples,in an automated grading device that uses convolutional neural networks to extract the size,color,texture,an...     

分布动态载荷识别的抗噪处理

针对正交多项式频域法在用多种响应对矩形薄板进行载荷识别中抗噪性较差的问题,综合运用平均法、矩阵预处理和奇异值截断法等方法对之进行改善,并引入空间映射的思想,将该方法的应用范围拓展为复杂的模型.利用仿真算例,证实了该方法具有较好的抗噪性.     

基于MELTAC-N平台的核电厂安全级DCS环网研究与测试

针对工程实践中环网通讯相关问题的处理缺乏理论基础及国产化安全级DCS平台的开发缺乏成熟经验借鉴问题,对基于MELTAC-N平台核电厂安全级DCS环网的软硬件实现进行了研究。提出了安全级DCS环网双环网冗余设计、光切换开关设计等硬件设计方法,以及以RPR协议为基础,采用全数据收发策略的软件设计方法。在CPR1000安全级DCS平台上对安全级DCS环网的可靠性及实时性进行了评价,并进行了容错能力、响应时间及响应时间稳定性测试验证实验。结果表明,基于MELTAC-N平台安全级DCS环网软硬件设计具有较好的容错能力及响应时间稳定性。     

Short-Term Relay Quality Prediction Algorithm Based on Long and Short-Term Memory

The fraction defective of semi-finished products is predicted to optimize the process of relay production lines, by which production quality and productivity ar...     

End-to-End Multiview Gesture Recognition for Autonomous Car Parking System

The use of hand gestures can be the most intuitive human-machine interaction medium.The early approaches for hand gesture recognition used device-based methods....     

The laboratory simulation of abrasive wear

Abrasive wear has long been recognised as one of the most potentially serious tribological problems facing the operators of many types of plant and machinery; several industrial surveys have indicated that wear by abrasion can be responsible for more than 50% of unscheduled machine and plant stoppages. Locating the operating point of a tribological contact in an appropriate operational ‚map’︁ can provide a useful guide to the likely nature and origins of the surface degradation experienced in use, though care must be exercised in choosing the most suitable parameters for the axes of the plot. Laboratory testing of materials and simulations of machine contacts are carried out for a number of purposes; at one level for the very practical aims of ranking candidate materials or surface hardening treatments in order of their wear resistance, or in an attempt to predict wear lives under field conditions. More fundamentally, tests may be aimed at elucidating the essential physical mechanisms of surface damage and loss, with the longer term aim of building an analytical and predictive model of the wear process itself. In many cases, component surface damage is brought about by the ingress of hard, particulate matter into machine bearing or sealing clearances. These may be running dry although, more usually, a lubricant or service fluid is present at the interface. A number of standardised wear test geometries and procedures have been established for both two- and three-body wear situations, and these are briefly described. Although abrasive wear is often modelled as following an ‚Archard’︁ equation (i.e. a linear increase in material loss with both load and time, and an inverse dependence on specimen hardness) both industrial experience and laboratory tests of particularly lubricated contacts show that this is not always the case: increasing the hardness differential in an abrasively contaminated lubricated pair may not always reduce the rate of damage to the harder surface.     

Limits of topographic measurement by the scanning tunnelling and atomic force microscopes

Parameters describing the topographic character of a surface (height, surface wavelength, slope and curvature) can be derived from equivalent sinusoidal profiles. The response of a surface-measuring instrument may be modelled in terms of instrument parameters such as stylus radius, and scanning range and resolution. The performance of the instrument may then be mapped as a zone in amplitude-wavelength (AW) space to show the sinusoidal profiles it is capable of measuring. In a first-order analysis the STM and AFM are considered as equivalent to contact-stylus instruments with a notional stylus radius equal to the tip radius plus the gap. Comparisons between different instruments and types of instrument are readily made by mapping in AW space. The error arising from convolution of the sinusoidal profile with that of the finite tip may be quantified and plotted as contours in AW space.