闭合薄壁剖面杆刚度计算的有限元素法

利用有限元法对飞机闭合薄壁剖面杆结构进行刚度计算，其结果与全尺寸试验值吻合较好。     

空间运输飞行器材料与制造技术需求分析

空间运输飞行器已经成为国际航天技术新的发展趋势,对材料和制造技术从两方面提出了新的需求:异形贮箱制造技术和热控材料与制造技术。本文对这两个问题进行了分析,结果表明:异形贮箱和热控硬件的材料与制造是制约空间运输飞行器发展的基础技术,必须在空间运输飞行器研制热潮之前先期突破。     

分布式干扰仿真研究

在简要分析旁瓣对消原理的基础上,通过建模与仿真对多干扰机分布式干扰对抗雷达旁瓣对消的效果进行了分析,结果表明,多干扰机分布式干扰是对抗旁瓣对消的有效技术途径.     

一种新型多模式高速存储器

随着图像采集精度的提高和立体成像的需求,图像数据速率和总量呈几何级数增长,促进了高码率大容量存储的需求。提出一种新的高速存储器方案,通过改变FLASH类型和存储数据处理方式提高数据存储速率,以适应采集图像高精度和高速率的要求。     

Investigations into sensing characteristics of circular thin-plate electrostatic sensors for gas path monitoring

Circular thin-plate electrostatic sensors are promising in gas path monitoring due to their advantages of non-intrusiveness and easy installation. The spatial sensitivity and filtering effect are two important performance parameters. In this paper, an analytically mathematical model of induced charge on a circular thin-plate electrode is first derived. Then the spatial sensitivity and filtering effect of the circular electrostatic sensor are investigated by numerical calculations. Finally,experimental studies are performed to testify the theoretical results. Both theoretical and experimental results demonstrate that circular thin-plate electrostatic sensors act as a low-pass filter in the spatial frequency domain, and both the spatial filtering effect and the temporal frequency response characteristics depend strongly on the spatial position and velocity of the charged particle. These conclusions can provide guidelines for the optimal design of circular thin-plate electrostatic sensors.     

燃烧室声学测量和仿真的误差影响因素分析

动态压力数据对于燃烧室声学特性及燃烧不稳定性的分析具有十分重要的意义,由于测点数量有限,实际工程分析中还需要借助声学仿真补充模态分布及频响曲线等多维信息。某些情况下,主次模态频率间隔较小、主模态幅值不太突出,声学测量和仿真之间的误差会严重影响对实际声模态类型的判断。通过燃气发生器缩尺件声学实验及仿真计算,具体分析了在燃烧室声学特性分析过程中的各种误差源,其中包括测量点位置、来流温度、喷注及测量缩进小腔等。研究表明:声学仿真能够准确得到实际的声学模态频率分布,平均温度引起的频率差异不可忽略,非波腹位置处测量的模态幅值需要考虑测点位置的影响,喷注缩进小腔能使特定模态幅值降低,而测量缩进小腔会导致某阶模态幅值的测量结果偏高。     

高校艺术类学生存在问题及针对性教育之我见

论文针对如今招生趋势良好的高校艺术类专业的学生当中存在的一些问题进行了分析和探讨,从树立正确的人生观和价值观、学会感恩以及培养各方面素质全面发展的人才这三个方面入手,建设性地提出了相关的引导学生改进所存在问题的方法和策略.     

基于SPM的航空转包生产能力研究

针对国际航空转包对航空制造企业生产能力的要求,分析了航空转包能力的评价构成要素,基于供应商绩效测量标准体系SPM建立了转包能力的模型和转包能力的三维体系结构,并通过三维能力模型的能力分区分层评价对航空企业的转包能力进行分析。该模型及方法能对企业转包能力进行全面评价,发现企业转包生产的能力优势和能力薄弱环节,为企业提高转包能力指明了纠正和完善的方向。     

波音737—200／300／500飞机尾部结构疲劳裂纹的探伤检查

波音系列飞机一定时间后，飞机尾部结构出现疲劳裂纹，需用涡轮检测法进行损伤检查。     

Optimized Fuzzy Clustering Method for Health Monitoring of Shield Tunnels

Since health monitoring of shield tunnels generally employs multiple sensors belonging to different types,a fine analysis on massive monitoring data,as well as further quantitative health grading,is really challenging.An optimized fuzzy clustering analysis method based on the fuzzy equivalence relation is proposed for health monitoring of shield tunnels.Clustering results are auto-generated by using fuzzy similarity-valued map.The results follow the idea of unsupervised classification.Moreover,a convenient new health index HI is proposed for a fast tunnel-health grading.A case study on Nanjing Yangtze River Tunnel is presented to validate this method.Three types of indicators,namely soil pressure,pore water pressure and steel strain,are used to develop the clustering model.The clustering results are verified by analyzing the engineering geological conditions;the validity and the efficacy of the proposed method are also demonstrated.Further,the fuzzy clustering analysis also represents a potential for identifying abnormal monitoring data.This investigation indicates the fuzzy clustering analysis method is capable of characterizing the fuzziness of tunnel health,and beneficial to clarify the tunnel health evaluation uncertainties.