相依竞争失效模型下细纱机性能退化对成纱质量的影响

Influence of performance degradation of spinning frames on yarn quality under dependent competition failure

针对细纱机性能退化对纺纱质量影响难以精确表征的问题,首先,利用棉纺生产数据分析了细纱机性能退化对成纱质量指标的影响,研究了质量指标之间的关系。然后,通过细纱机性能退化的参数筛选、指标建立以及突发失效过程预测,对细纱机性能退化过程进行了表征。其次,利用Wiener过程、Weibull分布对细纱机性能退化过程进行了模拟,构建了一种基于Copula函数的细纱机性能退化相依竞争失效模型,并对比分析了模型应用前后纺纱质量关键指标的变化。最后,依托海量棉纺生产数据,验证结果表明构建的相依竞争失效模型较好地解决了细纱机性能退化对纺纱质量影响的问题,而且经模型应用,使得纱线的粗节减少了10.09%,毛羽减少了23.5%,单纱断裂强度提升了4.26%。

This study tackles the difficulties in accurate characterization on the influence of the performance degradation of spinning frames on the yarn quality,and the relationship among quality indexes were studied based on data of cotton spinning production.The performance degradation process of spinning frames was characterized by parameter selection,index establishment and sudden failure process prediction.Wiener process and Weibull distribution were adopted to predict the sudden failure process of the performance of the spinning frame,and a copula function based performance degradation dependent competitive failure model of the spinning frame was constructed.The changes of the key yarn quality indexes before and after the application of the model were compared and analyzed.Through exemplar verification,the results show that the dependent competition failure model is able to predict the influence of the performance degradation of spinning frames on spinning quality.After the application of the model,the coarse knot value was decreased by 10.09%,the hairiness value was decreased by 23.5%and the breaking strength of single yarn was increased by 4.26%.