基于多源信息融合的煤岩属性识别研究

Coal-rock property identification based on multi-source information fusion

  • 摘要: 截割煤岩属性识别主要包括截割时产生的过程信号识别、红外成像识别、图像特征识别、反射光谱识别等。由于掘进巷道环境复杂,掘锚一体机运行过程中产生的噪声易将截割产生的声波信号湮没,振动信号同样也易受设备自身振动干扰,而基于红外成像、图像识别的方法易受掘进高粉尘、低照度环境影响,在实际掘进工作面的应用效果不佳,同时,基于单一传感器的识别方法会受环境复杂程度和识别区间的限制。针对上述问题,提出了一种基于声波、振动信号的多源信息融合识别方法。首先,针对井下环境复杂存在噪声干扰的问题,利用变分模态分解(VMD)算法对声波、振动信号进行分解,提出基于香农熵的模态筛选准则,对声波、振动信号进行重构去噪,获取有效振动与声波信号;然后,基于马尔可夫转移场(MTF)将声波、振动信号特征序列转换为二维图像进行特征融合;最后,引入结合卷积块注意力模块(CBAM)的卷积神经网络(CNN),对二维图像信息进行空间特征学习,实现多尺度特征的自动提取与关键特征的精准强化,完成截割煤岩属性的精准识别。实验结果表明,所提方法的识别准确率达99.4048%,显著优于传统CNN模型。

     

    Abstract: Coal–rock property identification during cutting mainly includes the recognition of process signals generated during cutting, infrared imaging, image feature recognition, and reflectance spectrum identification. Owing to the complex environment of roadway excavation, noise generated during the operation of a roadheader-bolter integrated machine easily overwhelms the acoustic signals produced by cutting, while vibration signals are also susceptible to interference from the machine's own vibrations. Methods based on infrared imaging and image recognition are easily affected by high dust concentration and low illumination during excavation, resulting in poor performance in practical working faces. Meanwhile, identification methods based on a single sensor are limited by environmental complexity and the identification range. To address these issues, a multi-source information fusion identification method based on acoustic and vibration signals was proposed. First, considering the complex underground environment with strong noise interference, the Variational Mode Decomposition (VMD) algorithm was used to decompose acoustic and vibration signals, and a Shannon entropy-based mode selection criterion was proposed to reconstruct and denoise the signals, thereby obtaining effective acoustic and vibration signals. Then, a Markov Transition Field (MTF) was employed to transform the acoustic and vibration signal feature sequences into two-dimensional images for feature fusion. Finally, a Convolutional Neural Network (CNN) combined with a Convolutional Block Attention Module (CBAM) was introduced to perform spatial feature learning on the two-dimensional images, enabling automatic extraction of multi-scale features and precise enhancement of key features, and thus achieving accurate identification of coal–rock properties during cutting. Experimental results showed that the proposed method achieved an identification accuracy of 99.4048%, which was significantly higher than that of traditional CNN models.

     

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