• Transportno inženjerstvo, konstrukcije i logistika, Semester 3, position 2

The main objective of this course is to achieve competence of students to master the principles of cranes design and that is able to be incorporated into the cranes design process in the future engineering work. The goal is to master specific practical skills for the selection of drive units, calculation of support steel structures of cranes and to get the knowledge on the standards for calculation, as well as realization of technical documentations.

Upon successful completion of this course, students should be able to: • identify, classify and analyze regular, occasional and exceptional load at overhead travelling cranes • perform calculation and selection of the bridge crane geometry • determine the load of the bridge crane in characteristic cross section • perform proof of stress, proof of deformation, proof of dynamic stiffness, proof of elastic stability, proof of bolted connection between the main girders and end carriages • perform calculation and choose stiffnesses • perform calculation of end carriages • carry out the verification of the analytical calculation with the results obtained in the FEM software package

The basic principles of cranes design, trends in development, maintenance, transportation and crane installation, testing and registration of cranes, safety measures. Standards for calculation of support structures of cranes, trolley selection, sizing and calculation of trolley supporting structure and its drive. Calculation of support structure of bridge cranes, the selection of geometry of main girders and end carriages, proof of stress, proof of deformation, proof of dynamic stiffness, loads of main girder, proof of welded connections. Elastic stability of girder, local stability of plate, calculation of the connections of main girders and end carriages, calculation of end carriage, specificities in calculation of the single girder bridge cranes.

Realization of the project of double girder crane, selection of drive units, selection of geometry and calculation of support structures of trolley and crane, proof of elastic stability - buckling of plates, calculation of single girder bridge cranes. Computer exercises, calculation of supporting structure of bridge cranes by using FEM, with training in the use and application of specialized software package KRASTA (Cranes Statik, non-commercial academic version without restrictions concerning calculations), for static and dynamic analysis of supporting structures of material handling and conveying machines by using finite elements method.

The conditions are defined by the curriculum of the study program.

1. Nenad Zrnic: handouts - Written lectures, 2011, DVL 2. KRASTA - Program for statical and modal analysis of spatial frames, MANUAL, DVL. 3. Computers, Laboratory 516, ICT / CAH 4. KRASTA software package - program for statical and modal analysis of spatial frames, BSB Kühne GmbH, ICT / CSP

Total assigned hours: 75

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

Auditory exercises: 0
Laboratory exercises: 15
Calculation tasks: 0
Seminar paper: 0
Project: 15
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: 5
Test: 0
Test: 0
Final exam: 5

Activity during lectures: 10
Test/test: 0
Laboratory practice: 20
Calculation tasks: 0
Seminar paper: 0
Project: 40
Final exam: 30
Requirement for taking the exam (required number of points): 35

Slobodan Tosic, D. Ostric: Cranes, Faculty of Mechanical Engineering, 2005,; J. Verschoof, Cranes Design, Practice and Maintenance 2nd Edition, Wiley, 2002 ; Slobodan Tosic, D. Ostric: Cranes, Faculty of Mechanical Engineering, 2005, KDA.