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Indirect payload estimation in cable-logging operations

The paper proposes a novel technique to estimate the payload to which a cable system is loaded, from the analysis of the cable deflection occurring in the outhaul phases. The idea is to exploit a precision GNSS sensor to measure the difference of the vertical deflection between the outhaul phase with respect to the theoretical chord line connecting the two ends of the cable. A single-span downhill-oriented cable yarding system was used as case study. Continuous measurements of both mainline sag and tensile force combined with a theoretical model available from the literature allowed to estimate the given payload. The results show that the GNSS system was sufficiently precise to determine the cable deflection as the estimated and measured payloads were found to be positively correlated.