Naslov
Research of Forwarder Performance on Hard and Soft Soil

Autori
Horvat, Dubravko ; Poršinsky, Tomislav

Vrsta, podvrsta i kategorija rada
Sažeci sa skupova, sažetak, znanstveni

Izvornik
Forest and Society: The Role of Research, Vol. 3 Poster abstracts / Krishnapillay, Baskaran et all. - Kuala Lumpur : IUFRO Secretariat, 2000, 111-112

Skup
XXI IUFRO World Congress 2000

Mjesto i datum
Kuala Lumpur, Malezija, 07.08.2000. - 12.08.2000

Vrsta sudjelovanja
Poster

Vrsta recenzije
Međunarodna recenzija

Ključne riječi
wood extraction; forwarder; soft soil; hard soil; penetration characteristic; rut formation; wheel slip; productivity

Sažetak
This paper deals with the investigation of the impact of forwarders on soil, their tractive performance and productivity on hard and soft soil. Heavy, six-wheel forwarders with a capacity of 14 tons are the most frequently used vehicles for wood extracting after reproductive and final cutting in low-land oak forests in Croatia. Since this transportation is mostly carried out during winter with unfavourable soil conditions, the impact of the forwarder on the soil and its productivity represents an essential technological parameter. The measurements were carried out in two ways: 1) The investigation of the impact of forwarders on soil was performed under controlled conditions on 2 testing skid trails: soft and hard. At the same time granulometric composition and soil moisture were determined and the measuring equipment in the laboratory vehicle was used to measure: - soil penetration resistance before and after the pass of the vehicle with cone penetrometer, - rut formation, - wheel slip curve (gross tractive coefficient vs. slip) 2) Productivity investigation was carried out by work study methods during the transportation of wood from an oak stand without influencing the forwarder driver. The soil was divided in two categories: hard and soft. 207 transportation samples were recorded on hard soil and 163 on soft soil. The differences of mean load volume, travelling time and productivity depending on soil conditions were defined. The research of forwarder performance carried out under the above said conditions showed a considerable effect of forwarders on soft soil (rut formation and penetration characteristics), lower traction capabilities (wheel slip curve) and reduced productivity.

Izvorni jezik
Engleski

Znanstvena područja
Biotehnologija

POVEZANOST RADA