ارزيابي عملكرد (توليد و هزينه) اسكيدر چرخ لاستيكي تيمبرجك C450 (مطالعه موردي در جنگل خيرود كنار نوشهر)

Evaluation of the efficiency of timberjack 450 C wheeled skidder (case study: In Kheyroudkenar forest)

Wood extraction from the cutting areas to the roadside has the highest expenses of the whole logging operations. This research deals with this matter and studies the production and cost rates of TAF skidder in cut-to-length system. The study was carried out in Kheyroudkenar Educational and Experimental Forest Station at Nowshahr, Iran. Using continuous time studies, the effective factors of skidding including skidding and winching distance, volume, slope, number of logs and tree species were identified and recorded. Overall, 44 turns were recorded on timberjack, and the collected data were analyzed and skidding models were developed. The results showed that the production rates for Timberjack were 8.22 m3/hr (including delay times) and 8.88 m3/hr (no delays). Production costs were 66674 and 61746 rials/m3 respectively. Changing the amounts of each variable when the others were fixed, showed that increasing each variable for timberjack has a linear increase in cost except only increasing the annual utilization for timberjack, the cost showed a parabola.