Granične sile i mase tovara pri privitlavanju drva

Marenče, Jurij (author), Šušnjar, Marijan (author)

Stabilnost traktora osim uzdužnog i poprečnog kuta stabilnosti podrazumijeva i sigurnost sidrenja traktora pri privitlavanju drva. Privitlavanje predstavlja vuču drvnih sortimenta po tlu od mjesta izrade u sječini do šumskog vozila za privlačenje drva opremljenog sa šumskim vitlom. Kod određenog graničnog tovara i nagiba terena dolazi do narušavanja uzdužne stabilnosti šumskog vozila s vitlom. Pri tome je faktor prijanjanja skidera i traktora sa podlogom važan pokazatelj mogućnosti sigurnog i pravilnog privitlavanja drva. Na osnovi općeg izraza za faktor prijanjaja skidera na ravnom terenu određen je faktor prijanjanja pri privitlavanju drva na nagibu te prikazan dinamički model opterećenja šumskog vozila pri privitlavanju drva. U rezultatima su prikazane granične horizontalne komponente sile u užetu i granične mase tovara u slučaju privitlavanja drva skiderom Ecotrac 120 V. Prema dobivenim vrijednostima graničnih horizontalnih komponenti sila u užetu može se zaključiti da je upravo stabilnost vozila definirana pomakom vozila u nazad granični uvjet privitlavanja drva. Prikazani model privitlavanja drva na nagibu prikazuje temeljni princip za određivanje graničnih tovara i nagiba terena, a koji se može lako prilagoditi ostalim uvjetima privitlavanja drva pri različitim položajima vozila i pravcima privitlavanja drva s obzirom na stvarne eksploatacijske uvjete.

• Language: Croatian
• Keywords: privitlavanje drva, stabilnost, dinamički model, granične sile, mase tovara
• Work type: Article
• Typology: 1.01 - Original Scientific Article
• Organization: BF - Biotechnical Faculty
• Publication status: Published
• Publication version: Version of Record
• Year: 2019
• Number of pages: Str. 515-521
• Numbering: Vol. 143, no. 11/12
• PID: 20.500.12556/RUL-114226
• UDC: 630*37
• ISSN on article: 0373-1332
• DOI: 10.31298/sl.143.11-12.1
• COBISS.SI-ID: 5630374

Copyright

Podatek o licenci CC BY-NC-ND 4.0 je naveden v zapisu za nadrejeno revijo na portalu Hrčak – https://hrcak.srce.hr/sumlist. (Datum opombe: 16. 5. 2025)

Note

KLJUČNE BESEDE: privlačevanje lesa, stabilnost, dinamični model, mejne sile, masa tovora

• Publication date in RUL: 19.02.2020

Record is a part of a journal

• Title: Šumarski list
• Shortened title: Šumar. list
• Publisher: Savez inženjera i tehničara šumarstva i drvne industrije Hrvatske
• ISSN: 0373-1332
• COBISS.SI-ID: 30498

Licences

• License: CC BY-NC-ND 4.0, Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International
• Link: http://creativecommons.org/licenses/by-nc-nd/4.0/
• Description: The most restrictive Creative Commons license. This only allows people to download and share the work for no commercial gain and for no other purposes.

Secondary language

• Language: English
• Title: Limiting forces and load masses during timber winching

Abstract

The stability of a forest vehicle apart from the longitudinal and transversal stability angle implies the safety of tractor anchoring during timber winching. Timber winching is a dragging of timber assortmens on the ground from the stump to a forest vehicle equipped with the forest winch. At a certain limiting load and slope of the terrain, disturbance of the longitudinal stability of the forest vehicle with the winch is occured. In this case, the adhesion factor of skidder and tractor on the ground is an important indicator of the possibility of safe and proper timber winching. The adhesion factor of the skidder during timber winching on the slope is determined on the basis of the general expression of the adhesion factor on the skidder on the flat ground. Also, determined the dynamic model of the loading of the forest vehicle is presented during timber winching on the slope. The results show the horizontal components of forces in the rope and the limiting masses of the loads during timber winching by skidder Ecotrac 120 V. According to the obtained values of the horizontal components of forces in the rope, it can be concluded that the stability of the vehicle, defined by the displacement of the vehicle backwards is the limitation of the timber winching. The presented model of timber winching on the slope shows the basic principle for determining the limiting load masses and slope of the terrain, which can applied to all types of forest vehicles equipped with winch as well as easily be adapted to other conditions of timber winching at different positions of the vehicle and the direction of timber winching.

• Keywords: timber winching, tractor stability, dynamic model, limiting forces, load masses