经编纱线动态张力评价指标

针对目前高频张力测试系统得到的经编纱线动态张力评价方法欠缺的现象，提出用概率密度曲线和峰度、偏度来评价经编纱线动态张力的整体波动情况。为检验所提出评价指标的可行性，利用高频张力测试系统采集5种不同机速下30 s内的经编纱线张力数据，用概率密度曲线和峰度、偏度对张力数据进行处理分析比较。结果表明：5种机速下的经编纱线动态张力的峰度均小于0，偏度均大于0，且随着测试机速的增加，峰度和偏度值均不断减小，结合概率密度曲线分析得出，随着测试机速的增加，纱线张力波动不断减小，张力更加均衡，这与实际织造情况一致，从而验证此评价指标的可行性。

Evaluation of dynamic tension of warp knitting yarn

Aiming at the lack of evaluation method of dynamic tension of warp knitting yarn obtained by high frequency testing instrument, an index, i. e. , the probability density curve and kurtosis, skewness used to evaluate the overall fluctuation of warp knitting yarn tension was proposed. In order to test the feasibility of the index, warp yarn tension within 30 s under five different machine speeds were tested by high frequency testing instrument. The probability density curve and kurtosis andskewness were used to analyze the tension data. The research results show that the krutosis of warp yarn tension under five different machine speeds aresmaller than 0, and the skewness aregreater than 0.The kurtosis and skewness decline with the increase of machine speed. Combine with the probability density curve, the research results show that with machine speed increase, the fluctuation of yarn tension decrease, which means yarn tension is more balanced. The results verify the feasibility of this evaluation method because it’s consistent with the actual knitting situation.