• Semester 6, position 3

Basic course goals (objectives): 1) introducing students with specificities of working process, design, modeling and calculation of construction and mining machines and appliances. 2) mastering practical skills which are necessary for selection, design and calculation of construction and mining machines.

After successfully completing this course the student should be proficient in: • Calculating basic parameters of various types of excavators and loaders; • Calculating basic geometrical parameters of excavator buckets (length, height, depth) of known volume; • Properly choosing and calculating basic geometrical parameters of bucket teeth; • Performing resistance-to-excavation, bucket filling and dug material prism movement calculations; • Determining loads acting on excavator boom, bucket and bucket holder; • Develop a conceptual design of a mini-excavator.

Short survey on the development of construction and mining machines. Technology of earthmoving work in construction industry and mining. Basic structural scheme of construction and mining machines. Types of working devices and equipment. Drive and transmission systems. Main design parameters. Interaction between cutting elements and soil. Excavators and loaders. Equipment for preparation, excavation transport and planning. Machines for soil stabilization. Machines and plants for aggregate production, production and installation of concrete and asphalt concrete.

Calculation of backhoe excavators, power shovels (front shovels), dragline excavators and loaders. Calculation of basic geometrical parameters of bucket (width, height, length) of known volume. Adoption and calculation of basic geometrical parameters of teeth (width, length, cutting angle, geometry of the cutting wedge, rear angle). Calculation of working loads caused by soil excavation. Load analysis of excavating device. Static stability. Calculation of loader. Conceptual design of mini excavator. Consultations.

Required previously passed courses: Engineering Graphics, Strength of Materials, Material Science, Machine Elements 1.

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: 0
Review and grading of lab reports: 0
Review and grading of seminar papers: 0
Review and grading of the project: 4
Test: 6
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

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, Elements of construction and mining machines, - Instructions for project realization, University of Belgrade, Faculty of Mechanical Engineering, Belgrade, 2008.