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针对TMS320F2812芯片没有D/A的问题,利用片上设备与外围电路设计用PWM端口实现D/A转换.利用TI公司的IQm ath库,得到了比一般定点处理器运算速度更快、精度更高的正弦值生成方法,并运用该方法对所设计的D/A转换进行了调试,调试结果证明该方法达到了设计要求. 相似文献
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Microstructure and mechanical properties of the joint of 6061 aluminum alloy by plasma-MIG hybrid welding 下载免费PDF全文
Plasma-MIG (metal inert gas arc welding) hybrid welding of 6061 aluminum alloy with 6 mm thickness using ER5356 welding wire was carried out.The microstructures and mechanical properties of the welded joint were investigated by optical microscopy,X-ray diffraction (XRD),energy dispersive spectroscopy (EDS),tensile test,hardness test and scanning electron microscope (SEM) were used to judge the type of tensile fracture.The results showed that the tensile strength of welded joint was 142 MPa which was 53.6% of the strength of the base metal.The welding seam zone was characterized by dendritic structure.In the fusion zone,the columnar grains existed at one side of the welding seam.The fibrous organization was found in the base metal,and also in the heat affected zone (HAZ) where the recrystallization occurred.The HAZ was the weakest position of the welded joint due to the coarsening of Mg2Si phase.The type of tensile fracture was ductile fracture. 相似文献
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针对埋弧自动焊过程控制及焊接操作控制的特点和工艺要求,在MZ-1250 晶闸管式埋弧自动焊机主电路的基础上,设计了以TMS320F2812为核心的埋弧焊数字控制系统,并设计了埋弧自动焊机数字控制系统的外围硬件电路,硬件电路主要包括焊接电流采样电路、同步和晶闸管触发电路及保护电路等.本文重点阐述电路的设计思想、硬件结构及工作原理. 相似文献
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针对接管、筒体的正交马鞍形曲线焊接,为了定量分析五轴联动马鞍形焊接系统(θr,,h,α,β)简化为四轴联动系统(θr,,h,β)的焊枪姿态误差,建立了马鞍形焊接运动系统的数学模型,运用空间解析几何原理推导出了简化后的焊枪前后倾角的误差公式。利用Matlab进行作图分析,得到了最大焊枪前后倾角与接管、筒体筒径比以及焊枪旋转角度之间的关系曲线。结果表明,正交马鞍形曲线焊接时,焊枪旋转角度和筒径比对最大的枪姿误差有直接影响,可为生产中合理选用四轴联动马鞍形焊接系统提供参考。 相似文献
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介绍了2种阀门等离子弧粉末自动堆焊方式:螺旋堆焊和同心圆堆焊.通过对2种堆焊方式的焊接转胎自动调速控制系统及焊枪摆动控制系统的对比,总结出了2种堆焊方式的优缺点. 相似文献