DIGITALNA ARHIVA ŠUMARSKOG LISTA
prilagođeno pretraživanje po punom tekstu
| ŠUMARSKI LIST 12/1974 str. 32 <-- 32 --> PDF |
Considering the smaller share of time for felling stems in the structure of offective time, the application of felling machines would not be reflected nearly so favourably as the application of barking machines. The obtained percentage of delay time in relation to the offective time (ca. 31°/o) can be considered real. It was established that under conditions of teh stands of the same site quality the stochastic interrelation between time consumption for individual operations and the stem characteristics (diameter b. h.) can be smoothed numerically bu means of regression equations for simple correlation — except the cross-cutting, when the multiple correlation ought to be applied. The obtained results of investigations demonstrate that the time for individual operations, as well as the effective time, increase with the increasing of stem diameter, except the time for turing logs. The time consumption per one m´ of converted volume demonstrates a decline with the stem diameter increasing in all the operations. Thus also the effective time and the time standard per one m3 of converted volume of roundwood (>7 cm) as well as of logs and pitprops decrease with the stem diameter increasing. A comparison of the work performance in the stoutest and thinnest stems dealt with shows a 1:2,5 ratio in favour of the stouter stems. |