Course code MežZ2046

Credit points 3

Forest Machines Theory

Total Hours in Course81

Independent study hours81

Date of course confirmation22.12.2020

Responsible UnitDepartment of Forest Utilisation

Course developers


Aleksandrs Saveļjevs

Dr. sc. ing.

author lect.

Māris Davidāns

Mg. sc. ing.

author Mežsaimniecības institūts

Ziedonis Sarmulis

Dr. sc. ing.

Prior knowledge

Fizi2013, Physics

MašZ4021, Technical Graphics

Mate1033, Mathematics II

Mate4016, Mathematics I

Course abstract

Course project examines forest machine choice and principled mechanism for load calculations. The acquired knowledge allows you to select the forest machines and calculations forest machinery.

Learning outcomes and their assessment

After studying the course the student will have:
• Knowledge of the calculation of the loads of machines used in logging.(course project)
• Skills for visual and technical assessment of forest techniques, aggregating capabilities,(course project) • Competencies - responsible for advising forest workers on the feasibility and calculation of logging machines in the specific development of felling areas.(course project)

Course Content(Calendar)

1. Selection of felling-felling machines, depending on the conditions of logging.
2. Selection of rolling-tracking machines, depending on the logging conditions.
3. Calculation of productivity for machinery used in the forest.
4. Determination of critical indicators for stability of logging machines.
5. Calculation of force moments by aggregating the transport unit with a hydromanipulator.
6. Calculation of forest trailer loads.
7. Calculation of the force of Vilz in forest works.
8. Calculation of static loads of the timber lifting mechanism.
9. Assessment of dynamic loads by manipulating round timber.
10. selection of ropes, endurance rating to tensile.
11. Assessment of the resistance of the metal rod to the compressive in the forest works.
12. Resistance to spinning and bending, calculation of the gearing vertebrae.
13. Repair of different components of forest equipment: uninterruptible compounds.
14. Repair of different components of forest equipment: connections to be dismantled.
15. Selecting screws and locks.
16. Design and submit a Course

Requirements for awarding credit points

The course project must be designed in full and evaluated with a note.

Description of the organization and tasks of students’ independent work

Literature studies. Preparation of the course project according to the methodological instructions.

Criteria for Evaluating Learning Outcomes

Subject spotlight; assessment of achievement of purpose and tasks; implementation of the methods applied; structure and presentation of work; literature used and sources of information; presentation skills. In defending work, the student answers questions about the developed course project and the subject studied. As a result, the course project supervisor shall evaluate the developed

Compulsory reading

1. Kobcevs A. Lietišķā mehānika. Rīga, 2006.
2. Dobelis H. Tehniskā mehānika. Liepāja, 2007.

Further reading

1. Miķelsons Z., Pīrs V. Spēkratu konstrukcijas. Jelgava: LLU, 2008.199 lpp.
2. Saliņš Z. Mežizstrādes tehniskais progress. Rīga: Liesma, 1974.159 lpp.

Periodicals and other sources

1. Baltijas koks, ISSN 1407-6667
2. Meža Avīze, ISSN 1407-6187


The study course is included in the compulsory part of full-time and part-time studies of the professional higher education bachelor study program “Forest Engineer” of the Faculty of Forestry.