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ŠUMARSKI LIST 11-12/2016 str. 33     <-- 33 -->        PDF

Technical Features of Urus MIII Skyline Yarder – Tehničke karakteristike žičare Urus MIII
Urus MIII skyline yarder is in use in Turkey since 1980’s (Fig. 2). The maximum extraction distance of Urus MIII skyline yarder is 600 meters and four workers are employed for operating the skyline yarder. The mounting time of the skyline yarder is between 4-8 hours, while the dismantling time is between 4-6 hours depending on terrain conditions and installation distance. The technical features of the Urus MIII skyline yarder is showed in Table 1.
Variables and Data Collection – Varijable i prikupljanje podataka
Time study is a set of procedures for determining the amount of time required, under certain standard conditions of measurement, for tasks involving some human, machine or combined activity (Wang et al., 2003). Time study is an important research tool used in comparing productivity at forest harvesting systems across varying conditions (McDonald and Fulton, 2005). Also, the productivity analysis of cable extraction is an important factor for road network planning (Cavalli and Grigolato, 2010). Time measurement studies were conducted in several different studies for forest machines. Also, for productivity of using forest machines are used different time measurement techniques (Aykut et al., 1997; Caglar et al., 2003; Ozturk, 2004).
The repetition time study method was used to determining the production of Urus MIII skyline yarder. Time consumption is conducted using the repetition-timing method to determine the total yarding cycles times (Proto and Zimbalatti, 2015). The time elements considered in the yarding work cycles include; travel of unloaded carriage, hooking of load, travel of loaded carriage and unhooking of load. During the use of skyline yarder, recorded data included productivity cycle time elements and other independent variables associated with each activity. Two different delays were recorded during time study, an operational and a technical delay. Operational delays were recorded in loading area and unloading area due to operator and workers and technical delay occurred