ASSERTIVENESS OF A LOG LENGTH SENSOR ALLOCATED IN DIFFERENT POSITIONS ON THE HARVESTER HEAD

Wood length variability can affect operational yield and productivity in harvesting forest transport operations. Assertive lengths meet positive quality criteria for the product to cellulose factory delivered. Therefore, research is needed assess assertiveness measuring wood logs' length. Thus, objective was evaluate sensor accuracy at different positions harvester head. The following treatments were defined: coupled wheel without a protective piece (T1); with (T2); feed roller (T3) (T4). study carried eucalyptus plantation destined production of pulp and, through daily measurements log field, 8373 obtained. Data submitted ANAVA, mean tests (Tukey Scott-Knott), Statistical Process Control (SPC) frequency distribution. Treatments T1 T3 presented average corresponding 6.46 m 0.11 0.17 standard deviation, respectively. T2 T4 6.42 deviation equal 0.12 0.16 m, treatment assertive distribution frequencies, presenting 80% logs processed within established limit (6.30 6.70 m) while T2, 55%, 45% 40%, It concluded that obtained greater final