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Poršinsky, T., T. Pentek, A. Đuka, 2012: Opisna i namjenska klasifikacija terena za pridobivanje drva i otvaranje šuma. Studija, Šumarski fakultet Sveučilišta u Zagrebu, Zagreb, str. 1–64.
Poršinsky, T., Šušnjar, M., Đuka, A., 2012: Određivanje faktora raspodjele mase tereta i privlačenja. Nova meh. šumar. 33: 35–44.
Rowan, A. A., 1996: Terrain Classification. British Forestry Commision, Forest Research – Technical Note 16/95, 1–6.
Sabo, A., 2003: Oštećivanje stabala pri privlačenju drva zglobnim traktorom Timberjack 240C u prebornim sastojinama. Šum. list 127(7–8): 335–346.
Sabo, A., Poršinsky, T., 2005: Skidding of Fir Roundwood by Timberjack 240C from Selective Forests of Gorski Kotar. Croat. j. for. eng. 26(1): 13–27.
Sever, S., 1980: Istraživanje nekih eksploatacijskih parametara traktora kod privlačenja drva. Disertacija, Šumarski fakultet Sveučilišta u Zagrebu, Zagreb, str. 1–301.
Sever, S., Horvat, D., 1985: Šumski zglobni traktor snage oko 60 kW. Studija, Šumarski fakultet Sveučilišta u Zagrebu, Zagreb, 1–187.
Sirén, M., J. Hyvönen, H. Surakka, 2015: Tree Damage in Mechanized Uneven-aged Selection Cutting. Croat. j. for. eng. 36(1): 33–42.
Solgi, A., Naghdi, R., Tsioras, P.A., Nikooy, M., 2015: Soil Compaction and Porosity Changes Caused During the Operation of Timberjack 450C Skidder in Northern Iran. Croat. j. for. eng. 36(2): 217–225.
Spinelli, R., Magagnotti, N., Di Fulvio, F., Bergström, D., Danelon, M., Alberti, G., 2014: Comparison of Cost Efficiency of Mechanized Fuel Wood Thinning Systems for Hardwood Plantations on Farmland. Croat. j. for. eng. 35(2): 111–123.
Strandgard, M., Alam, M., Mitchell, R., 2014: Impact of Slope on Productivity of a Self-levelling Processor. Croat. j. for. eng. 35(2): 193–200.
Suvinen, A., 2006: A GIS-based Simulation Model for Terrain Tractability. Journal of Terramechanics 43(4): 427–449.
Šušnjar, M., 2005: Istraživanje međusobne ovisnosti značajki tla traktorske vlake i vučne značajke skidera. Disertacija, Šumarski fakultet Sveučilišta u Zagrebu, Zagreb, str. 1–146.
Šušnjar, M., A. Bosner, T. Poršinsky, 2010: Vučne značajke skidera pri privlačenju drva niz nagib. Nova meh. šumar. 31: 3–14.
Tomašić, Ž., 2012: Razvoj tehnologije i tehničkih sredstava u pridobivanju drva s obzirom na posebnosti šuma i šumarstva u Republici Hrvatskoj. Nova meh. šumar. 33: 53–67.
Visser, R., Berkett, H., 2015: Effect of terrain steepness on machine slope when harvesting. International Journal of Forest Engineering 26(1): 1–9.
Visser, R., Stampfer, K, 2015: Expanding Ground-based Harvesting onto Steep Terrain: A Review. Croat. j. for. eng. 36(2): 321–331.
Vusić, D., 2013: Pogodnost sustava pridobivanja drvne biomase u smrekovoj šumskoj kulturi. Disertacija, Šumarski fakultet Sveučilišta u Zagrebu, 1–174.
Wong, J.Y., 1989: Terramechanics and off-road vehicles. Elsevier Publications, 1–251.
Summary
Maneuverability of specialized forestry vehicles is defined by their ability to overcome terrain unevenness during which interaction between vehicle and terrain geometry occurs. Maneuverability, as a segment of vehicle mobility, is defined by: 1) obstacle crossing, 2) vehicle controllability and 3) ride comfort.
Vehicle specifications are determined during design and construction (dimensions, steering and locomotion systems, mass and its distribution on axles etc.) and together affect the level of vehicle maneuverability. Independently of vehicle purpose, many maneuverability parameters (directly connected to operational use) including approach, departure and ramp (break-over) angles as well as clearance radii are known, but their calculation for varying types of vehicles (different construction, purposes etc.) is still vague.
On the example of wheeled cable skidder, this paper deals with approach, ramp (break-over) and departure angles, longitudinal and transversal clearance radii as significant parameters for skidder mobility and maneuverability on uneven forest stands. Considering specific wheeled cable skidder design and construction together with constant relation of dimension characteristics regardless of different manufacturers, expressions for approach, ramp break-over and departure angles, longitudinal and transversal clearance radii are derived.
Key words: skidder, approach angle, ramp (break-over) angle, departure angle, longitudinal clearance radius, transversal clearance radius