COMPLEX INTERACTION OF FORESTRY MACHINES AND EQUIPMENT
Main researcher
: SEVER, STANISLAV (43066) Assistants
HORVAT, DUBRAVKO (16384)
VONDRA, VENCL (70055)
MARTINIĆ, IVAN (136986)
KNEŽEVIĆ, IVO (21470)
Type of research: applied Duration from: 01/01/91. to 12/31/95. Papers on project (total): 84
Institution name: Šumarski fakultet, Zagreb (68) Department/Institute: FORESTRY RESEARCH INSTITUTE Address: SVETOŠIMUNSKA 25, P.P. 178 City: 10000 - Zagreb, Croatia
Communication
Phone: 385 (0)41 218 288
Fax: 385 (0)41 218 616
Summary: Mechanized procedures of wood production; opening of forest
areasby road-building; silviculture; forest protection; and nurseriesare
all characterized by complex interaction of machines anddevices. The same
applies to Croatian forestry. At the time whenthe project began in 1991,
Croatian forest exploitation usedabout 6 thousand chain saws, about 1
thousand tractors - of whichabout 350 special forest tractors - round 400
trucks and 500cranes and other machines and equipment.
Due to the war the number of the machines has changedconsiderably: at first
the chain saws went down to 4000 innumber, but later, in 1992 there were
almost 5000. In 1993 therewere about 750 tractors, 230 of them being
special foresttractors; 250 wood transport set equipments; about 325
cranes,etc. The machines were used for the production of 3.2 mill. m3timber
gross weight (about 2.7 mill. m3 timber net weight).
By collaboration in the research, which was for the most partpractically
applied, the cause and consequence of machine use inforest environment were
studied together with the impact of theoperators, organizers and the whole
management environment uponthe efficiency of the mechanized process. The
criterion ofhazardousness for the environment is deciding in
choosing,controlling and influencing the development of
forestmechanization, this being the reason for encompassing so
manydifferent fields in the research on the machines and devices usedin
forestry.
Keywords: forest (forestry) machines and equipment, machine and forest soil, technologies and work methods, ergonomics, forest opening, forest biomass, forest damages, standardization, terminology, harvesting, skidding timber (un)loading, wood transportation
Research goals: The basic aims of the research are summarized in the
following items: (1) theoretical research on the status of groups of
skidding machines that belong to the family of the off-road vehicles; (2)
theoretical principles of evaluating forest tractors in terms of the
kinematical radius of the wheel; (3) data bank of relating groups of forest
machines; (4) forest biomass as a part of forest exploitation produce -
quantity and thermal value; (5) consequences of machine and load movement
over forest soil (off-road and skidding tracks); (6) damage made upon the
parts of trees above and under the ground; (7) issues relating to the
energy needed for machine use; (8) energy balance of the mechanized
forestry technologies and methods; (9) achievement of satisfying results in
organization of forestry production and work preparation; (1) complexness
of the ergonomic phenomena. The following are the significant contributions
to the science of forest machines and knowledge on forest technologies: (a)
selection of skidding tractors according to the evaluated morphological and
movement properties; (b) limits in machine impact upon soil; (c) stand
damage in various procedures and methods of work mechanization; (d)
technology of forest biomass production with the characteristics of cause
and consequence; (e) energy consumption of various machines and work
methods; (f) data banks of skidders and forwarders; (g) energy consumption
in forest work; (h) ergonomic exertion in working with forest machines.
COOPERATION - INSTITUTIONS
Name of institution
: Javno poduzeće "Hrvatske šume" Type of institution: Institution whose primary activities ar City: 10000 - Zagreb, Croatia
Name of institution
: Šumarski institut Jastrebarsko Type of institution: University/Faculty City: 10420 - Jastrebarsko, Croatia
Name of institution
: IUFRO, Division 3, S3.06; Oregon State
University Type of institution: State administration City: Corvallis, USA
Name of institution
: ISTVS - International Society for
Terrain-Vehicle Systems Type of institution: State administration City: Hamburg, Germany Other information about the project.