Research on a novel imaging bionic polarization navigation sensor for glimmer environment application

Polarization navigation system is a hotspot in the field of bionic navigation. Compared with point source polarized light navigation sensor, the polarization information acquisition method based on image sensor and imaging technology has better robustness, and it can obtain more polarization information. In this paper, an embedded imaging polarization sensor for glimmer environment application is designed and developed. The multi-channel video processing technology of TMS320DM642 is used to capture the polarization information of charge coupled device (CCD) camera with three channels. The images are processed by digital signal processer (DSP) in real time, and the angle of polarization (AOP) image is calculated simultaneously with an acquisition and calculation speed of 10 frame per second. Sensor can obtain absolute rotation angle, and the AOP image can be displayed on liquid crystal display (LCD). It provides an effective experimental platform for the research of imaging polarization mode navigation device based on embedded system.     

网络化协同产品定制及其系统集成研究

针对当前网络化产品定制系统存在的主要问题，提出了一种网络化协同产品定制模式。该模式通过客户与企业协同的网络化产品定制过程，使制造企业能在全球范围内快速满足客户的多样化需求、充分发挥客户的创造性；通过与企业相关环节的系统集成，可以实现整个企业以客户需求为驱动的协调运行和资源共享。提出了网络化协同产品定制运行模式与组织模型，并给出了支持多种定制方式的客户需求定义方案。基于所提出的网络化协同产品定制运行模式，进行了系统集成研究，提出了一种J2EE平台下基于XML连接器的系统集成解决方案。     

后掠式叶片气动外形优化设计

后掠式叶片具有载荷自适应性，提出了一种以自然样条曲线为后掠曲线，以扭角为优化参数的后掠式叶片优化设计方法。以直叶片模型为设计起点，通过Profili软件获得叶片的截面数据并计算叶片翼型在不同攻角下的升力系数与阻力系数，以叶片功率系数最大以及叶片根部载荷最小为优化目标，采用遗传算法对叶片进行优化设计。根据优化结果获得的参数，建立后掠式叶片三维模型，在ANSYS Workbench中建立流场模型进行仿真分析得到叶片模型的压力分布情况。结果表明，通过对扭角、后掠值进行优化，后掠叶片模型对比直叶片模型其受到的载荷有所减小，优化设计方法可以用于指导后掠叶片的设计。     

双级固溶处理对7A55铝合金组织与力学性能的影响

采用光学显微镜、透射电子衍射和扫描电子衍射显微分析技术,结合力学性能检测和电导率测定的方法,研究双级固溶温度和时间对7A55铝合金板材力学性能的影响。结果表明:最佳双级固溶制度为450℃,90 min 485℃,40 min。采用该固溶制度经120℃,24 h时效后,板材的拉伸力学性能达到σb=648.4 MPa,σ0.2=629.6 MPa及δ=11.9%。第一级固溶制度是影响板材力学性能的主要因素,最佳固溶温度为450℃。在450℃进行第一级固溶后,样品发生了较强的回复,由于降低了再结晶驱动力,第二级高温固溶在获得较高的合金元素过饱和度的同时,仅发生较少的再结晶,从而在随后的时效过程中产生更高的析出强化效应。     

固溶后预析出对7A55铝合金力学及腐蚀性能的影响

采用硬度测试、电导率测试及透射电镜观察，研究固溶后降温至440℃预析出处理时间对7A55铝合金板材力学和腐蚀性能的影响。结果表明：随预析出处理时间的延长，基体析出相逐渐增多且长大，导致合金时效后硬度和强度先提高而后降低；晶界析出相逐渐长大，晶界无沉淀析出带宽化，晶界相不连续性先提高而后降低，导致合金抗晶问腐蚀和剥落腐蚀性能也先升高而后降低。     

Effect of Zr content on quench sensitivity of AlZnMgCu alloys

The effect of Zr content on quench sensitivity of AlZnMgCu alloys was investigated by mechanical properties testing and microstructure observations. The results show that with the increase of Zr the quench sensitivity relative to hardness and strength increases, while that relative to elongation decreases. From hardness and strength viewpoints, the low quench sensitivity is observed for the Zr-free and 0.05% Zr-containing alloys, which is quite quench sensitive from the ductility viewpoint. The largest quench sensitivity relative to hardness and strength is observed for 0.1% Zr-containing alloy, this is mainly due to large amount of high angle grain boundaries and incoherent Al3Zr dispersoids caused by recrystallization, which may efficiently promote heterogeneous precipitation during air quenching. More than 0.05% Zr can significantly decrease the quench sensitivity relative to ductility, which can be primarily attributed to recrystallization inhibiting and grain refining effects of Zr.     

Mechanism of strengthening of cube texture for high purity aluminum foils by additional-annealing

1　INTRODUCTIONHighpurityaluminumfoilsareusedastheanodematerialofhighvoltageelectrolyticcapacitorswhichneedstrongcubetexture { 0 0 1}〈10 0〉forlargeeffec tivesurfacefromchanneletching[1] .Becauseofitstechnicalimportance ,alotofeffortshavebeenmadetodevelopstrongcubetextureinhigh purityalu minumfoils[2 8] .Itwasfoundthatthecubetextureinthefoilscanbestrengthenedviaanannealingpro cessfollowedbyalowcoldrolling[7,8] ,andsuchanannealingiscalledadditional annealinginthispaper .Buttherewerefewinv…     

淬火速率对AlZnMgCu(Zr)合金断裂行为的影响

通过室温力学性能测试,光学显微镜、扫描电镜和透射电镜研究了淬火速率对AlZnMgCu(Zr)合金断裂行为的影响.结果表明:含Zr小于0.1%合金随着淬火速率的降低,由穿晶破断和沿晶开裂的混合型断裂逐渐转变成沿晶断裂;其主要原因是淬火速率降低使晶界无沉淀析出带(PFZ)宽化.含Zr大于等于0.1%的合金随着淬火速率的降低由穿晶破断为主的断裂逐渐转变成沿晶开裂和穿晶剪切的混合型断裂;沿晶断裂的产生主要是由于晶界无沉淀析出带宽化;穿晶剪切主要是由于慢速淬火过程中晶粒内部析出了大量粗大的η平衡相.     

淬火介质对7055铝合金晶界析出行为的影响

采用透射电镜研究了淬火介质对7055铝合金晶界析出相及无沉淀析出带的影响。结果表明，空气淬火时，合金冷却过程在晶界上析出η平衡相。合金经室温水淬及沸水淬火合金时效后，晶界析出相尺寸差别小，呈链状连续分布；晶界无沉淀，析出带较窄，平均宽度分别约为33nm和43nm。空气淬火合金时效后晶界析出相尺寸差别较大，呈不连续分布；晶界无沉淀，析出带很宽，约102nm。对其原因进行了分析和讨论。     

基于等离子体朗缪尔流效应的新型微机械陀螺仪

首次将等离子体作为敏感元件应用于微机械陀螺仪中,取代目前微机械陀螺仪中所采用的固体、液体或气体等元件。利用气体放电产生的等离子体朗缪尔流效应来使敏感元件产生一定速度的运动,不需另外的驱动元件。介绍了等离子体朗缪尔流效应,探讨了应用朗缪尔流效应的新型微机械陀螺仪的原理,根据Langmuir-Drugvesteyn理论推算朗缪尔流速度可达到6 m/s,给出了该新型微机械陀螺仪的微加工与封装方案和工艺参数优化试验系统。