Consequently, in thinned stands, the harvester operated within stable work cycles in terms of the number of activities per single work cycle, and the difference in work times between the standard calculation method, snap-back timing PSION and the two cumulative timing methods was much smaller than that in the clear-cutting operations.
For time studies covering harvester operations where the duration of particular activities is measured manually, the snap-back timing method should be recommended, since it is based on measuring the time of every operation separately, determining a mean value of their duration and totalling the data obtained according to the arbitrary, theoretical structure of work cycles.
His drop-back timing, anticipation and post-snap coverage reads have been poor this season.
"When, really, we're consciously pushing back timing to allow ourselves to focus on its production and product enhancements in Model S".
The analyses were supplemented with the standard calculation method of snap-back timing.
The results obtained from the snap-back timing methods were compared with the cumulative timing PSION and cumulative timing VIDEO measurement methods.
The hitherto employed method of snap-back timing is more accurate than the cumulative timing method with respect to both stable and more changeable work cycles.
The average duration of work cycles was also determined from the data collected in the PSION microcomputer using the standard calculation method of snap-back timing.
With regard to the snap-back timing PSION calculation method, the duration of a work cycle was determined for regular, five-activity cycles.
The primary results indicated that the snap-back timing method is slightly more accurate than the cumulative timing method, in reference to both stable work cycles and more variable work time structure.
In the latter case, the appropriate method of measurement would be snap-back timing, which involves separate measurements of elements of work (Bergstrand 1987; Jourgholami et al. 2013; Yoshida and Sakai 2015).
