| Título: | 0.345 Attenuation Law of Vibration Signals During Caving |
| Autores: |
Li, Xu; North China Institute of Science and Technology Gu, Tao; North China Institute of Science and Technology |
| Fecha: | 2014-04-01 |
| Publicador: | TELKOMNIKA: Indonesian journal of electrical engineering |
| Fuente: |
 |
| Tipo: |
info:eu-repo/semantics/article info:eu-repo/semantics/publishedVersion |
| Tema: |
Department of Mechanics and Electronics Engineering 0.345 Attenuation Law; SPC; First Order Forward Difference; Wavelet Transform Modulus-maxima |
| Descripción: | To study on the characteristics of the vibration signals of coal and stone hitting the armor plate during caving, a hybrid algorithm based on first order forward difference and wavelet transform modulus-maxima method is presented which can be used in the longwall top coal face. First, in order to reduce the noise interference, the pre-processing of the vibration signals is done by the first order forward difference method. Second, the wavelet transform modulus-maxima method is used to analyze the resluts of the difference for the post-processing of the data. Finally, attenuation formula is defined in the first-level details (D1). We can learn by the experimental results that the hybrid algorithm provides real-time, high confidence identification of coal and stone by analysis of the first-level details that has approximate 0.345 attenuation law between the wavelet transform modulus-maxima (the maximum coefficient) and the wavelet transform modulus-minima (the minimum coefficient). Because the wavelet transform modulus-maxima’s abscissa and the wavelet transform modulus-minima’s abscissa are adjacent to each other, the concept of Singularity-point Couple(SPC) is defined. Based upon the attenuation law and the defined concept, interference signals can be eliminated, vibration signals can be restored, and some prediction work can be done. |
| Idioma: | No aplica |