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E-mail: milos.tanasijevic@rgf.bg.ac.rs

Machine Elements

Course Description

Study program: Environmental Engineering (IV semester -OAS), Mining Engineering (IV semester -OAS), Petroleum Engineering (IV semester -OAS)

Name of subject: Machine Elements

Instructors: Dr Miloš Tanasijević, Milica Ivić

Status: Compulsory

ECTS: 7

Prerequisites: -

Course Objectives: Introduction of students with machine elements, as part of the science of machine constructions and as basic elements of mining mechanization. Students learn about methods of calculation, pipe lines elements, elements for joints, power transmision, motion. Teach students to understand function of mechanical systems, applications, variants of design solutions and calculation. Students solve engineering problems in the form of tasks that are posed as real problems from the mining industry

Learning Outcomes: Active knowledge in the subject area and improvement of engineering methods of thinking of the machine design through the acquiring skills of the ability to determine the basic structural parameters of the machine elements: loads, critical (ultimate) stresses, safety factor, caring capacity, materials, design and dimensions, defining functions. Competence to identify and solve practical problems related to machinery and equipment in the mining industry, primarily from the aspect of maintenance and service.

Content:

Theory teaching
Introduction. Machine elements, Machine elements selection. Standardizations. Tolerances and fits, surface quality, shapes and positions. Mechanical design process. Types of Loading and Stress ratio, Force, Torque, Tension, Deformation, Strains, Safety and Reliability design and safety factor. Impact strength. Stress concentrations. Fatigue of materials. Pipes. Design according with kind of materials. Pipe connection. Theory of flow through the pipe, Calculations. Welded joints, type of joints, designing, technology of welding and checking. Screws. Standard threads. Analyses of forces. Ratio of external and inner forces, deformations diagram. Sharing of loads on the threads, melioration of loads sharing. Assurance of screw against self-wrench. Calculations of screws with variable load. Materials. Designing of screws. Springs. Mechanical transmissions. Power, torque, ratio. Friction transmission. Gears transmission. Gear selection: helical gear, spur gears, bevel gears, worm gears. Geometry and Kinematics of different types of gears. Velocity ratio Tooth profile. Gears calculations of strength. Designing of gears. Lubrications and cooling. Planetary gear and their application in the mining machines.Belt Drives. Principles. Geometry, Calculations of belts. Types of belts.Chain Drives. Tips ob chains. Designing and calculations.Shafts, axles, Selection. Designing, application on the mining machines. Calculations. Shaft Rigidity and Dynamic consideration. Keys. Design and calculations. Locking assemblies and shrink discs.Bearings. Designing. Selection and application. Cylindrical, Needle, Spherical, Tapered, Thrust bearing. Permissible angle of arrival, calculations, sealing. Life duration. Bearing manufacturers data. Mounted bearings. Anti-friction bearings, designing, hydrodynamic lubrication. Calculation.Couplings. Selections. Applications. Calculations. Rigid couplings, flanged couplings, Flexible shaft couplings, friction couplings, and other couplings.

Practical teaching
At the exercises, students take two tests in order to check the theoretical knowledge. Students also take five tasks from area of: pipelines, welded joints, screw bolted joints, shafts, rolling bearings. Name of projects are: pipeline for underground mining drainage, welded joints on the steel construction of mining machine, screw bolted joint on oil pipeline flange, gear box shaft, roller on belt conveyor. Through mentioned project tasks, students calculate dimensions, solve the problems of elements selections, checking of safe factor. Technical drawing.

Suggested Reading List

  1. Милосав Огњановић, Машински елементи, Машински факултет, Београд 2011.
  2. Милош Танасијевић, Слободан Ивковић, Машински елементи, приручник за вежбе са изводом из теорије, Рударско-геолошки факултет, Београд 2012.

Fund Hours:

Lectures Exercises Other forms of teaching Study research
3 2 0 0

Conduct of the Course: Theoretical teaching takes place in the form of classical lectures with multimedia support. Practical teaching is characterized by an interactive approach, where the teacher mostly encourages students to independently solve problems. Tasks and examples they works on the base of model from the black board.

AssessmentОцена знања:

Final Exam ECTS
Oral Exam 15
Written Exam 15
Classwork Assessment ECTS
Class Participation 10
Written Tests 30
Seminars 30

Additional Assessment Criteria -