Table 3 Mean and median (in parentheses) duration of activities constituting a work cycle measured by either the VIDEO or the PSION method
From: The accuracy of measurements in a time study of harvester operations
Activity number and detail | Mean duration (s) | |||||
|---|---|---|---|---|---|---|
Thinning operation | Clear-cutting operation | |||||
CT VIDEO | CT PSION | SB PSION | CT VIDEO | CT PSION | SB PSION | |
1. Positioning | 5.7 (5) | 5.8 (5)ns | 6.1 (5) | 11.6 (3) | 9.0 (3)** | 4.0 (3) |
2. Cutting | 2.8 (2) | 1.7 (2)** | 2.2 (2) | 4.2 (24) | 3.9 (6)ns | 4.4 (3) |
3. Felling/pulling a tree onto a machine | 6.6 (5) | 5.3 (5)ns | 5.6 (5) | 4.1 (3) | 19.3 (3)** | 29.9 (27) |
4. Delimbing and bucking | 27.7 (26) | 22.8 (24)** | 23.6 (25) | 26.2 (24) | 5.3 (6)** | 10.8 (6) |
5. Travel within a worksite | 12.2 (11) | 12.0 (8)** | 14.1 (8) | 6.2 (7) | 3.6 (5)** | 9.3 (6) |
Total duration of a work cycle | 55.0 | 47.6 | 51.6 | 52.3 | 41.1 | 58.4 |