TC18钛合金焊接技术在飞机起落架制造中的应用研究

在国内某型舰载机研制中,首次在起落架制造中开展了TC18钛合金焊接技术应用研究,通过试验研究,形成了完整实用的TC18钛合金焊接技术,能满足国产舰载机和其他新型飞机起落架的研制生产需求.     

航空工艺技术改造项目后评价探讨

文章阐述了航空工艺技术改造项目的内容和项目的特点,并根据投资项目后评价的理论体系,结合航空工艺技术改造项目的特点,分析了其后评价应考虑的因素、主要评价内容及评价方法.     

数值模拟技术在飞机复合材料结构制造中的应用

复合材料结构件在航空领域得到广泛应用,但制造中产生严重的翘曲变形影响外形精度和装配连接。因此,对其制造工艺的研究日益重要,尤其是对带有复杂轮廓型面复合材料整体结构件的制造工艺。本文对复合材料结构成型工艺中固化变形机理进行了分析,阐述了变形控制模拟技术的发展和其在飞机结构制造中应用的必要性,并以实例证明数值模拟技术是进行...     

欧洲市场直接运营成本（DOC）分析方法及应用

根据欧洲民航实际运营情况,总结分析欧洲AEA模型中用于飞机竞争分析和总体参数优化的DOC计算方法,建立欧洲市场直接运营成本计算分析模型,然后就某机型的欧洲市场和中国市场DOC计算进行分析,最后指出未来研究的方向。     

新的直升机复合材料涵道制造技术

为了实现AC332 民用直升机复合材料涵道结构的高质量、低成本、敏捷快速制造,针对结构特点和各项设计要求,开展正向工艺设计,提出一种新的直升机复合材料涵道制造技术。新的直升机复合材料涵道制造技术包括零件的精准制造技术、涵道结构胶接装配技术、精加工技术,对技术加以展开论述,介绍技术的应用情况;与传统的海豚直升机的涵道制造技术从多方面进行对比。结果表明：新的直升机复合材料涵道制造技术达到了降低成本、缩短制造周期、简化工装、提升质量、保证接口精度的效果,对其他直升机大部件的精准制造有重要的参考价值。     

高分子增材制造技术对我国航空制造业的发展影响研究

全球范围内,经权威机构正式认证的飞机金属增材制造零件数量目前仅两例;而高分子材料增材制造零部件,在波音飞机上正式使用已近20年之久,累计总量在10万件以上。将增材制造技术与航空产业进行深度融合,做好统筹规划与顶层设计,同等程度地重视用金属和高分子材料增材技术直接进行航空器零部件的制造,是促进产业健康可持续发展的关键环节。     

Collaborative optimization design of process parameter and structural topology for laser additive manufacturing

High-resolution laser additive manufacturing (LAM) significantly releases design freedom, promoting the development of topology optimization (TO) and advancing structural design methods. In order to fully take advantage of voxelated forming methods and establish the quantitative relationship between the mechanical properties of printing components and multiple process factors (laser- and process- parameters), the concurrent optimization design method based on LAM should cover the process-performance relationship. This study proposes a novel artificial intelligence-facilitated TO method for LAM to concurrently design microscale material property and macroscale structural topology of 3D components by adopting heuristic and gradient-based algorithms. The process–structure–property relationship of selective laser sintering is established by the back propagation neural network, and it is integrated into the TO algorithm for providing a systematic design scheme of structural topology and process parameter. Compared with the classical optimization method, numerical examples show that this method is able to improve the mechanical performance of the macrostructure significantly. In addition, the collaborative design method is able to be widely applied for complex functional part design and optimization, as well as case studies on artificial intelligence-facilitated product evaluation.     

数字化导管加工与常规导管加工对比浅析

通过数字化导管加工与常规导管加工在协调方法、工艺过程、检测方法等方面对比分析,得出数字化导管制造可以缩短制造周期、降低生产成本的结论,能够适应现代飞机快速研制及改型需求,形成现代飞机导管制造核心竞争力。     

机身部件对接阶差超差典型问题的分析及解决

针对某型飞机机身前段和中段对接时,对接框机身外形阶差连续几架飞机超出设计技术条件规定的问题,从零件制造、装配型架卡板外形、装配应力三方面分析产生故障的原因,并采取相应的控制措施,使部件装配时外形符合要求,最终解决了机身对接时发生的阶差超差问题。     

Characteristics of recent dust storms over the Indian region using real time multi-satellite observations from the direct broadcast receiving system at IMD

In this study, observations from microwave satellites, visible and infrared instruments have been analyzed to detect dust storm over north and north–west part of India during 18–23 March 2012. This study investigated the approach to utilize the multi satellite data of Moderate Resolution Imaging Spectroradiometer (MODIS) on-board the Terra and Aqua satellite and the Advanced Microwave Sounding Unit (AMSU) on-board NOAA satellite to study the characteristics of dust storms from real time direct broadcast (DB) receiving system installed at three places of India Meteorological Department (IMD). The dust storm detection is based on the infrared brightness temperature (BT) difference between channels at 11 and 12 μm and polarized BT difference between two channels of 89 and 23.8 GHz. It is found that the significant differences between the BT of channel 89 and 23.8 can be used as a discriminator of identifying dust storm. The Total Ozone Mapping Spectroradiometer (TOMS) Aerosol Index (AI) and AMSU-A 23 GHz channel BT from NOAA satellite over the north and north-west part of India have also been analyzed. The result indicated the characteristic behavior between BT and AI during the different phases of the dust storm. Finally, the occurrence of dust outbreaks has also been validated with sky radiometer of IMD, which confirms the presence of a dust storm over the Indian region. Further, the findings of the study and its approaches apply to the other dust storm cases which occurred during the months of April and June 2012. The integrated approach suggested the potential to use high resolution data of microwave as well as thermal–infrared using multi-satellite observations from real time direct broadcast system for the detection of severe, moderate or weak dust storms very well. The approach is found to be promising for operational application.