东华大学 机械工程学院， 上海 201620
发布日期:2020-01-06通讯作者:李蓓智，女，教授，博士生导师，电话(Tel.): 13661486853; E-mail: lbzhidhu@163.com.作者简介:郭维诚（1990-）男，上海市人，博士生，主要研究方向为磨削加工与智能监控.基金资助:国家科技重大专项资助项目(2018ZX04011001)Monitoring of Grinding Signals and Development of Wheel Wear Prediction Model
GUO Weicheng,LI Beizhi,YANG Jianguo,ZHOU QinzhiCollege of Mechanical Engineering, Donghua University, Shanghai 201600, China
Published:2020-01-06摘要/Abstract
摘要： 针对磨削过程中砂轮磨损难以直接监测的问题，提出了基于多特征优化融合的随机森林(MFOF-RF)算法，以实现砂轮磨损的准确预测.对外圆纵向磨削中采集的功率、加速度和声发射信号进行预处理和特征提取，获得平均值、有效值以及峰值频率等多个时域和频域信号特征.以统计学指标为评价标准，对预测模型的参数进行调优，确定了最佳的砂轮磨损信号特征组合.结果表明，相比于使用单一特征预测砂轮磨损，MFOF-RF模型提高了信号特征与砂轮磨损的相关程度，预测误差降低了30%以上.
关键词: 砂轮磨损； 多特征优化融合； 特征选择； 随机森林
Abstract: Based on the issue that monitoring of wheel wear is difficult to be implemented directly during grinding process, a multi-feature optimization and fusion based random forest (MFOF-RF) algorithm was proposed to realize the accurate prediction of wheel wear. An experiment of cylindrical traverse grinding was performed and the power, acceleration and acoustic emission signals were collected and processed in order to extract a large amount of time-domain and frequency-domain signal features. Statistical criteria were used to adjust model parameters and choose best feature combination for the prediction of wheel wear. The results shown that the MFOF-RF model improved the prediction accuracy and diminished error more than 30% compared with the model with single feature.
Key words: grinding wheel wear; multi-feature optimization and fusion; feature selection; random forest
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