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基于自适应模糊前馈-反馈机制的筛分加料含水率控制方法

Method for controlling moisture content in tobacco strips during screening and casing based on self-adaptive fuzzy feedforward-feedback mechanism

  • 摘要: 为解决筛分加料工序含水率控制精度低等问题,采用基于自适应模糊前馈-反馈机制的控制算法对含水率控制系统进行改进,根据延时后的入口含水率和电子秤瞬时流量、蒸汽瞬时流量、料液瞬时流量及其变化计算前馈加水量,再根据当前出口含水率计算反馈加水量,将前馈加水量和反馈加水量相加得到当前所需加水流量,由此计算对应阀门开度。以石家庄卷烟厂3个卷烟品牌为对象进行测试,结果表明:系统改进后出口含水率无明显波动,过程能力指数CPK提高75%,标准偏差降低36%。该方法可为提高卷烟生产均质化水平提供技术支持。

     

    Abstract: In order to control the moisture content in tobacco strips in screening and casing process precisely, the moisture content control system was upgraded with a control algorithm based on self-adaptive fuzzy feedforward-feedback mechanism. The feedforward input water flow was calculated according to the delayed moisture content in input tobacco, delayed instantaneous input tobacco flow, instantaneous steam flow, instantaneous casing flow and their fluctuations; the feedback input water flow was calculated on the basis of current moisture content in output tobacco; the current input water flow was the sum of the two and from that the opening of the respective valve was determined. Cigarettes of three brands were tested in Shijiazhuang Cigarette Factory, the results showed that the moisture content in output tobacco did not fluctuated obviously, the process capability index CPK increased by 75%, and the standard deviation decreased by 36%. This method provides a technical support for promoting the consistency of cigarette manufacturing.

     

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