• Transportno inženjerstvo, konstrukcije i logistika, Semester 3, position 1

Basic course goals (objectives): 1) introducing students with specificities of working process, design, modeling and calculation of basic (fundamental) subsystems of construction and mining machines and appliances, primarily machines for continuous excavation and machines for crushing and screening. 2) mastering practical skills which are necessary for design and calculation of construction and mining machines.

By successfully completing this course the student should be able to competently assess the following problems: • Choosing a proper design and calculating rotating supports and mechanisms of earthmoving machines’ revolving superstructures: • Choosing a proper design and calculating basic parameters of the earthmoving machines’ movement mechanisms; • Determining and adopting basic parameters of the bucket wheel excavators’ (BWE) and bucket chain excavators’ drive systems; • Proper strength calculation of open-pit mining machines’ substructures using linear Finite Element Method (FEM); • Coupling of experimental and analytical data with the goal of properly determining parameters of BWE static stability; • Comparison of design approaches and calculation of basic parameters of jaw, conic, gyratory, roll crushers and impactors according to required degree of material fragmentation.

Design solutions and calculations of slewing platforms and mechanisms of excavators. Design solutions and calculations of crawlers and walking mechanisms for excavator movement. Use, working process, structural scheme, drive and transmission systems and calculation of bucket wheel excavators and bucket chain excavators. Analytical and experimental methods of determination of static stability parameters. Theoretical fundaments of crushing process. Jaw, cone, roll and impact crushers – design, calculation. Theoretical fundaments of screening process. Static and dynamic screens - design, calculation.

Calculation of working (excavating) equipment, operating modes, and power of mechanisms of excavators for continuous excavation. 3D modeling of characteristic subassemblies of excavators for continuous excavation. Calculation models of truss substructures of bucket wheel excavators. Computer simulations of external loads. Load cases. Stress – strain identification. Creation (Development) of technical drawings. Position determination, selection and calculation of basic (main) parameters of stackers (spreaders). Calculation of basic technical (design) and technological parameters, power and strength of jaw and cone crushers and screens. Consultations.

Defined by the curriculum of the study program

Computers, Laboratory 459(516), Software Mathlab, (Catia)

Total assigned hours: 75

New material: 20
Elaboration and examples (recapitulation): 10

Auditory exercises: 5
Laboratory exercises: 20
Calculation tasks: 5
Seminar paper: 0
Project: 0
Consultations: 0
Discussion/workshop: 0
Research study work: 0

Review and grading of calculation tasks: 0
Review and grading of lab reports: 5
Review and grading of seminar papers: 0
Review and grading of the project: 0
Test: 5
Test: 0
Final exam: 5

Activity during lectures: 10
Test/test: 30
Laboratory practice: 30
Calculation tasks: 0
Seminar paper: 0
Project: 0
Final exam: 30
Requirement for taking the exam (required number of points): 35

Vinko Jeftić, Construction and Mining Machines, University of Niš, Faculty of Mechanical Engineering, Niš, 1993.; Momir M. Plavšić, Construction Machines, Scientific Book, Belgrade, 1990.; Srđan Bošnjak, Bucket Wheel Trenchers, University of Belgrade, Faculty of Mechanical Engineering, Belgrade, 2001.,; Srđan Bošnjak, Handouts, University of Belgrade, Faculty of Mechanical Engineering, Belgrade, 2008., ; Srđan Bošnjak, Mining and construction machines - Instructions for writing laboratory reports, University of Belgrade, Faculty of Mechanical Engineering, Belgrade, 2008.,