摘要
现代轧机的轧制速度越来越高,压下量越来越大,轧制的板带越来越薄,且对板带的质量要求更高。轧制界面处的接触应力是轧制过程中关键的参数,其对板带的平整度以及轧辊的表面质量有着重要的影响。采用基于一种弹性理论的反演方法,从而根据布拉格光纤光栅(FBG)应变花测量轧辊内部一点处的弹性应变来逆推出轧制界面处的接触应力,运用数值方法对该理论传感器进行了仿真,利用经验模态分解(Empirical Mode Decomposition,EMD)方法中的包络拟合算法求均值曲线的思想,对该反演算法进行了改进,获得了较好的结果,从而评估了该传感器测量轧制界面接触应力的可行性,为下一步进行实验研究提供了理论算法基础。
The current trend of rolling mills combine higher rolling speeds, larger reductions, harder steel grades and thinner rolled strips. To achieve higher product quality, especially in terms of thickness, flatness and defect-free surface, knowledge of the contact stress between roll and strip becomes a critical factor. An inverse analytical method of elastic theory was used to determine the contact stress in the roll gap by measuring the stress tensor with fiber bragg grating rosettes at only one point inside the roll. Simulation was employed for the sensor by numerical method. Based on the idea of the envelopes fitting algorithms to calculate the mean curve during the empirical mode decomposition, the inverse algorithm was improved and good result was obtained. Titus, the ability of the new sensor to measure contact stresses was evaluated. The work provides algorithm theory basis to conduct experimental research for the next step.
出处
《机械设计与制造》
北大核心
2016年第7期24-28,共5页
Machinery Design & Manufacture
基金
国家自然科学基金资助项目(51405353
51475340)
教育部新世纪人才支持计划资助项目(NCET-12-0715)
省部共建耐火材料与冶金国家重点实验室开放基金(G201406)
湖北省自然科学基金(2014CFB825)
