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Ground Motor Vehicles II

Course developers

Prior knowledge

LauZ4250, Ground Motor Vehicles I

Course abstract

The aim of the study course: to learn the basic principles of vehicle engine operation, as well as the nuances of vehicle movement, their influencing factors and performance indicators.
Students get acquainted with theory of engine and ground motor vehicles. Parameters of effectiveness and power of engine, traction and dynamically calculations are inspected. Testing methodology of engines is overlooked and calculations are performed.

Learning outcomes and their assessment

Knowledge - about theoretical and real work cycles of internal combustion engines and their characteristic parameters. Knowledge of vehicle operating characteristics, factors influencing them, methods of their determination and evaluation.
Skills - to determine the main technical - operational parameters of vehicles and their engines, to compare and evaluate them.
Competence - the acquired knowledge and practical skills will enable to choose vehicles suitable for specific working conditions, to compile rational units of agricultural machinery and to determine their operating modes.
Test No. 1 - Theory of motor engines
Test No. 2 - Vehicle transmission theory
Able to calculate the thermodynamic processes of diesel engines, create a calculation of vehicle traction - laboratory and practical works.

Course Content(Calendar)

1. Introduction to motor theory, basic engine performance, terminology. (1 h lect., 1 h practical w., 1 h laboratory w.)
2. Internal cycle of internal combustion piston engines, indicating diagrams. Otto cycle. Diesel cycle. Mixed cycle. (2 h lect., 1 h laboratory w.)
3. Processes of the internal combustion piston engine: intake, compression, decomposition, expansion, exhaust. (1 h lect., 1 h practical w., 1 h laboratory w.)
4. Engine heat balance, key figures of the work cycle. Engine balancing. (2 h lect., 1 h laboratory w.)
5. Tractor performance. Motor speed curves. The propulsion dynamics. Driving moment, driving force. (1 h lect., 1 h practical w., 1 h laboratory w.)
6. Movement speed. Pneumatic wheel dynamics. Equation of motion, resistance forces. (2 h lect., 1 h laboratory w.)
7. Power balance. Tractor efficiency ratios. Tractive potential characteristic of the tractor. Dynamic characteristics of the runway. (1 h lect., 1 h practical w., 1 h laboratory w.)
8. Running and braking dynamics. Static and dynamic stability of the propeller. Gun control. (2 h lect., 1 h laboratory w.)
9. Running Relativity. Tractor passage. Agrotechnical excursion. (1 h lect., 1 h practical w., 1 h laboratory w.)
10. Fuel efficiency indicators, factors influencing them. Construction of cost-effectiveness charts. (2 h lect., 1 h laboratory w.)
11. Engine testing stands, hardware, methodology. Tractor testing equipment, hardware, methodology. (1 h lect., 1 h practical w., 1 h laboratory w.)
12. Engine regulation characteristic curves and speed characteristics, methods for obtaining and correcting them. (2 h lect., 1 h laboratory w.)
13. Airflow coefficient, its effect on the incineration process and the indicated power. (1 h lect., 1 h practical w., 1 h laboratory w.)
14. Indicative power, effective power determination methodology. Spread power balance. (2 h lect., 1 h laboratory w.)
15. Tractive potential trajectory of the tractor, its construction. Traction efficiency. (1 h lect., 1 h practical w., 1 h laboratory w.)

16. Comparison of propulsion and dynamic properties. (2 h lect., 1 h laboratory w.)

Requirements for awarding credit points

Laboratory works have been developed and defended, tests are successfully written. Examination.

Description of the organization and tasks of students’ independent work

Analysis of laboratory works.

Criteria for Evaluating Learning Outcomes

A student can get a successful check evaluation if at least 50% of the test questions are answered correctly. The examination mark is calculated as the mean of the arithmetic mean of the test work and the average grade of the examination test.

Compulsory reading

1. Gulbis V. Spēkratu teorija: mācību grāmata. Jelgava: LLU, 2007. 259 lpp.
2. Šmigins R. Iekšdedzes motoru teorija: mācību līdzeklis. Jelgava: LLU, 2008. 179 lpp.
3. Шароглазов Б.А., Фарафонтов М.Ф., Клементьев В.В. Двигатели внутреннего сгорания: теория, модeлирование и расчёт процессов: учебник. Челябинск: ЮУрГУ, 2004.

4. Wong J.Y. Theory of Ground Vehicles. 4th edition. Hoboken, New Jersey: John Wiley & Sons, INC, 2008. 560 p.

Further reading

1. Berjoza D. Automobiļu teorija: mācību grāmata. Jelgava: LLU, 2008. 200 lpp.
2. Köhler E., Flierl R. Verbrennungsmotoren: Motormechanik, Berechnung und Auslegung des Hubkolbenmotors. 4 Auflage. Braunschweig: Wiesbaden: Vieweg & Sohn Verlag/GWV Fachvelrage GmbH, 2006. 463 s.

3. Gulbis V. Spēkratu izmēģinājumu metodes: studiju palīglīdzeklis. Jelgava: LLU, 2008. 43 lpp.

Periodicals and other sources

1. Profi: Magazin fur Agrartechnik. [tiešsaiste] [skatīts 24.07.2021.] Pieejams: https://www.profi.de/heftarchiv/heftarchiv_11806677.html
2. Saimnieks LV. Riga. [tiešsaiste] [skatīts 24.07.2021.] Pieejams: https://www.saimnieks.lv/

3. Тракторы и сельскохозяйственные машины: Ежемесячный теоретический и научно-практический журнал. [tiešsaiste] [skatīts 24.07.2021.] Pieejams: https://www.vimsmit.com/jour

Notes

Compulsory course project for students of the sub-program "Agricultural Technique" of the academic bachelor study program "Agricultural Engineering".