Abstract
ABSTRACT Pickforce sensing is a method developed for automating the guidance of coal mining machines. Its objective is to determine the vertical location of a rotary cutting machine from the force measured at the point of contact between the machine and the coal seam. A phenomenon that may degrade the reliability of the pickforce data is vibration, and is the concern of this study. The effects of vibration may either be orderly or chaotic. The focus of this paper is on the orderly (repetitive) effect which may mask the pickforce data. To analyze this effect, a vibration model of the cutting process is first developed. Subsequently, the vibration model is explored to (a) demonstrate that the orderly effect does no reduce the reliability of the pickforce data, and (b) suggest alternative means in improving the quality of pickforce records by modifying parameters of the cutting machine
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