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Based on the phase space reconstruction of welding current in short-circuiting transfer arc welding under carbon dioxide, the approximate entropy of welding current and its standard deviation have been calculated and analyzed at different welding speeds and different electrode extensions respectively. The experimental and calculated results show that at a certain arc voltage, wire feeding rate and gas flow rate, welding speed and electrode extension have significant effects not only on the approximate entropy of welding current, but also on the stability of welding process. Further analysis proves that when the welding speed and electrode extension are in an appropriate range respectively, the welding current approximate entropy attains maximum and its standard deviation minimum. Just under such circumstances, the welding process is in the most stable state. 相似文献
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基于不同焊接速度下短路过渡熔化极二氧化碳气体保护电弧焊的焊接电流时间序列,利用Takens相空间重构技术和Lyapunov指数的Wolf算法,分析评估了焊接系统的最大Lyapunov指数。结果表明,当焊接过程的稳定程度较高时,最大Lyapunov指数较小;而当系统处于不稳定状态、状态变动迅速时,最大Lyapunov指数相应较大;因此最大Lyapunov指数和焊接过程稳定性成负相关关系,可以将其作为刻画短路过渡熔化极二氧化碳气体保护电弧焊稳定性的一种新的量化指标。 相似文献
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在依次改变送丝速度v_e。电弧电压U_a、保护气体流量Q、焊接速度v_w和焊丝伸出长度l_e等多种工艺参数的条件下,基于数值分析,全面评估了CO_2焊接过程熔滴短路过渡频率与焊接过程稳定性的定量关系,证明了在改变送丝速度v_e、电弧电压U_a和焊丝伸出长度l_e的条件下,熔滴短路过渡频率f与焊接过程的稳定性成正相关关系,而在改变保护气体流量Q和焊接速度v_w的条件下,熔滴过渡频率f却失去了表征焊接过程稳定性的能力,不能够作为焊接过程稳定性的评价指标。 相似文献
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The experimental time series of welding current produced by carbon dioxide gas metal arc welding with shortcircuiting transfer were recorded and subsequently evaluated. Based on phase space reconstruction, the correlation dimensions and Kolmogorov entropies of the corresponding system have been numerically calculated using the Grassberger-Procaccia algorithm at different time delays. It was found out that the time delay has little effect on the estimation of correlation dimension; conversely,it plays a key role in producing precise results on the estimation of Kolmogorov entropy. 相似文献
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