• Motor Vehicles, Semester 3, position 4
• Transportno inženjerstvo, konstrukcije i logistika, Semester 3, position 4
• Mechanics, Semester 3, position 4

Basic course goals (objectives): 1) introducing students with specificities of dynamic processes of construction and mining machines . 2) mastering practical skills which are necessary for analysis of dynamic behavior of construction and mining machines.

By successfully completing this course the student should acquire the following competences: • Properly forming the reduced dynamic models of earthmoving machines such as single-bucket excavators and bulldozers; • Determining elementary technical and exploitation characteristics of the machines used for material preparation and handling (rock crushers and sifters), accounting for dynamic effects occurring in such processes; • Modeling the excitation of continuous excavators and analysis of the influence of constructional and working parameters of the machine on the excitation caused by resistance to excavation; • Creating dynamic models of continuous excavators’ substructures; • Identification and analysis of continuous excavators’ substructures response to excitation caused by resistance to excavation; • Calculation and proper selection of basic parameters of conveyor belts with relatively high conveyor speed, dominantly used in mobile continuous earthmoving machines.

Fundamentals of basic excavating machines dynamics – backhoe excavators and bulldozers. Fundamentals of dynamics of raw material fragmenting and sorting machines – crushers and screening machines. Modeling of excitation of excavators for continuous excavation. Influence of design and work parameters on excitation caused by resistance to excavation. Modeling of bearing construction and mechanisms of excavators for continuous excavation. Identification and analysis of excavators for continuous excavation dynamic response on excitation caused by resistance to excavation. Vibrations caused by self-excitation. Dynamic response of bearing structure (construction) on excitation caused by wind. Dynamic of spreaders, mobile machines for continuous excavation (material handling).

Dynamic models of single bucket excavator excavating devices. Impact of Bulldozer to the obstacle. Calculation of basic parameters of crushing and screening machines. Bucket wheel excavators and trenchers excitation modeling (determination). Analysis of bucket wheel excavators bearing structure dynamic response on excitation caused by resistance to excavation Dynamic response of bearing structure (construction) on excitation caused by wind. Fundamentals of spreader dynamics. Consultations.

Required previously passed courses: Strength of Constructions, Structural and Stress Analysis, Mining and Construction Machines.

1. Computers, Laboratory 516 2. Software Mathlab, Catia

Total assigned hours: 75

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

Auditory exercises: 9
Laboratory exercises: 0
Calculation tasks: 5
Seminar paper: 0
Project: 15
Consultations: 0
Discussion/workshop: 1
Research study work: 0

Review and grading of calculation tasks: 6
Review and grading of lab reports: 0
Review and grading of seminar papers: 4
Review and grading of the project: 0
Test: 0
Test: 0
Final exam: 5

Activity during lectures: 10
Test/test: 35
Laboratory practice: 0
Calculation tasks: 0
Seminar paper: 0
Project: 25
Final exam: 30
Requirement for taking the exam (required number of points): 35

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, Fundamentals of Mining and Construction Machines Dynamics, - Instructions for seminar paper realization, University of Belgrade, Faculty of Mechanical Engineering, Belgrade, 2008.; J.P. Den Hartog, Mechanical Vibrations, McGraw-Hill Book Company, Inc., USA, 2007.