Validation and Extension of Visibility Requirements Analysis for Underground Mining Equipment.
NTIS: PB/83-252957 :65 pages
Six underground coal mine shuttle cars were used to assess visibility using visual attention locations (val) and an improved human eye reference measurement instrument (hermi mark II). Each machine was assessed in the inby and outby directions of travel without a canopy and with a canopy in its highest and lowest positions, enabling the illumination level at each val to be determined. The results showed that operator eye position was the most important variable determining visibility. When this variable is controlled, the addition of a canopy has no effect on visibility. Further, with the eye position controlled, there is no difference between high and low seam machines. The assessments showed blind spots on the opposite side of the car from the operator and ahead of the machine. The report includes suggestions to reduce the blind spots and a procedures manual for using hermi mark II and the system of val to assess visibility from underground mining equipment.
CP; Final Contract Report;
NTIS Accession No.
Canyon Research Group Inc.