Selective ensemble modeling based on nonlinear frequency spectral feature extraction for predicting load parameter in ball mills

• Published in: Chinese journal of chemical engineering 2015-12, Vol.23 (12), p.2020-2028
• Main Authors: Tang, Jian, Chai, Tianyou, Liu, Zhuo, Yu, Wen
• Format: Article
• Language: English
• Subjects: Kernel partial least squares; Least squares support vector machines; Material to ball volume ratio; Nonlinear latent feature extraction; Selective ensemble modeling; 参数选择; 最小二乘支持向量机; 特征提取; 组合建模; 集成建模方法; 非线性; 预测输出; 频率谱
• ISSN: 1004-9541; 2210-321X
• DOI: 10.1016/j.cjche.2015.10.006

Strong mechanical vibration and acoustical signals of grinding process contain useful information related to load parameters in ball mills. It is a challenge to extract latent features and construct soft sensor model with high dimensional frequency spectra of these signals. This paper aims to develop a selective ensemble modeling approach based on nonlinear latent frequency spectral feature extraction for accurate measurement of material to ball volume ratio. Latent features are first extracted from different vibrations and acoustic spectral segments by kernel partial least squares. Algorithms of bootstrap and least squares support vector machines are employed to produce candidate sub-models using these latent features as inputs. Ensemble sub-models are selected based on genetic algorithm optimization toolbox. Partial least squares regression is used to combine these sub-models to eliminate collinearity among their prediction outputs. Results indicate that the proposed modeling approach has better prediction performance than previous ones.