一种无人机通用综合检测系统

为了增强无人机系统检测控制设备的通用性,提高检测精度,设计了一种基于面向仪器系统的PCI扩展(PXI)总线及虚拟仪器(VI)的无人机通用综合检测系统.针对无人机系统工作的特点,从功能设计、体系结构、软硬件设计等方面对该系统的通用性进行了探讨.该系统采用了虚拟仪器技术,硬件设计采用PXI体系结构,软件以LabWindows/CVI作为开发平台.通过配备不同的接口适配器和对软件参数设置进行相应更改,可适用于不同型号的无人机电气、舵机、发动机、起飞和回收等系统检测.同时提供矩阵输出,利用系统资源满足无人机各种信号测试/激励的需求.该系统已成功应用于某复杂型号无人机的地面综合检测.      

Laser joining of CFRTP to titanium alloy via laser surface texturing

Grid pattern was textured on Ti-6Al-4V alloy (TC4) substrate surface by nanosecond laser system. Laser joining of carbon fiber reinforced thermoplastic composite (CFRTP) to TC4 joints were performed, and the effect of texture grid depth was investigated. The contact angle of molten CFRTP on textured TC4 surface was measured and the tensile-shear force was tested. The fracture surface and interface morphology were observed. The results indicated that the wettability of molten CFRTP on TC4 surface improved remarkably after laser textured TC4. Shear force of CFRTP/TC4 joints was increased by 156% after laser textured TC4 surface. When the depth of grid was deeper than 100 μm, contact angle increased and incomplete filling of molten CFRTP in grid occurred, the shear force thus decreased gradually. Resin-carbon fibers mixture was adhered on the fracture surface of TC4, and the variation tendency of adhesion ratio was consistent with that of shear force. TC4 matrix was exfoliated from substrate and adhered at the fracture surface of CFRTP, indicating stronger mechanical interlocking occurred at the joining interface after laser textured TC4 surface. Beside mechanical interlocking, compound layer consisted of CTi_0.42V_1.58 carburization phase was also confirmed at interface, suggesting that chemical bonding also occurred at the joining interface.     

空间指示语延伸的语义认知解读

指示语涉及语言结构与其所使用语境之间的关系。探讨其五种类型之一的空间指示语向其他领域延伸现象及其背后的语义认知原因,并提出指示现象最终依靠语境分析来理解话语。     

解Stokes问题的区域分解算法

对用非协调混合元离散的Ｓｔｏｋｅｓ问题，建立了延拓定理并分析了一个两子域不重叠区域分解算法，利用已有的对二阶椭圆型问题有效的预处理器，借助Ｂｒａｍｂｌｅ ＪＨ等的思想，将原鞍点问题变为一个在适当内积意义下的对称正定问题，并估计了它的条件数。     

纹理映射扩展的一个应用

纹理映射在提高图像逼真度方面起着关键的作用,纹理映射扩展是SGI图形工作站支持的对纹理映射技术的进一步扩展。以研制塔台管制模拟器为例,讨论了如何使用细节纹理扩展、锐化纹理扩展等纹理扩展技术来改进三维场景质量。