基于红外热像仪的激光-电弧复合焊接温度场的测量及Matlab转换

采用SC7750LW型红外热像仪采集了激光-电弧复合焊接高氮奥氏体不锈钢的熔池表面温度,通过Matlab数学软件建立了基于红外热像图的三维温度分布转换程序。研究了不同热输入条件下焊缝凝固速度与焊缝凝固模式的关系,并预测焊缝形成气孔倾向。研究了焊缝温度场与焊缝熔宽之间的相关性,获得了焊缝熔宽值与红外热图的关系,其熔宽计算值与实际值比较吻合。

基于现场CAD矿图的矿井通风信息转换提取

为解决由CAD矿图转成TF1M3D通风仿真可调用的数据问题,提出在原CAD矿图中从绘制矿井单线图时,标注系统构筑物和全部矿井通风信息.用线(Line)实体表达巷道,实体中赋予巷道标高和连通关系;用多义线(Polyline)表达风筒;用圆(Circle)表达增阻门(即风门、风窗或调节门等)和通风机,其中增阻门是按余弦定理判定圆心与巷道线距离最小来识别,按圆心捕捉在巷道端点来识别通风机,处在独立端点上的就是主要通风机.根据上述规则,编制了提取矿井单线图DXF文件信息的Matlab程序(TF1M3D_data DXF.m).研究结果表明:通过行扫描DXF文件,筛选寻找标志码AcDb Line、AcDb Text、AcDbCircle,可识别出矿井巷道拓扑信息和所有的通风参数,快速实现矿井立体巷道网和通风系统的快速建模,可与TF1M3D调用需求无缝对接.

Building Model of Photovoltaic Cell Module with MATLAB Simulink

In this paper, a PV （photovoltaic） module in renewable energy conversion system is simulated. The simulation of the system is developed using MATLAB/Simulink environments, which can be representative of PV cell, module and array for easy use on simulation block. The PV model is developed using basic circuit equations of the photovoltaic solar cells including the effects of irradiation and temperature. The output current and power characteristics of PV model are simulated. The results are provided and presented here.