Prof. Dr. Radomir Đokić
University of Novi Sad
Faculty of Technical Sciences

Abstract: The analysis of the dynamic behavior of vertical-rope systems is a complex task and represents an essential step in the design process and in establishing the conditions for the safe and efficient operation of such systems. The development of machines and equipment for vertical transport with specific characteristics, such as modern elevators and mine hoisting systems operating at great lifting heights and high velocities (exceeding 20 m/s), has necessitated the formulation of new computational procedures for analyzing their dynamic behavior. Because of its exceptional properties, steel wire rope is one of the most widely used structural elements in engineering. The complex construction of steel wire rope, which provides these properties, also affects its mechanical characteristics. Since the stiffness of steel wire rope can be more than twice lower than that of other elements used in the construction and manufacturing of components for vertical transport machinery, its influence on the dynamic behavior is significantly greater, making the analysis of such systems considerably more complex. This paper presents an analysis of the application of analytical-numerical and experimental procedures in the design of systems related to specific transport machines in which steel wire rope is the dominant element (elevators and mine hoisting systems). Using state-of-the-art computational-experimental methods, the paper presents specific results concerning the dynamic behavior of machines with a vertical rope as the load-bearing element.

Biography: Radomir Đokić, PhD, was born on 27 November 1978 in Radaљica, Municipality of Novi Pazar, to father Dobrivoje and mother Mira. He completed his primary education in Osaonica, Municipality of Novi Pazar, and graduated from the Technical High School in Novi Pazar in 1997. In the same year, he enrolled at the Faculty of Technical Sciences, University of Novi Sad, Department of Mechanical Engineering, where he chose the specialization in Mechanization I in his third year of studies. He graduated in 2002 with a grade point average of 9.09 and received the highest grade (10) on his diploma thesis examination. The title of his diploma thesis was “Research and Development of Passenger Electric Lifts”.

In 2002, he enrolled in postgraduate studies at the Faculty of Technical Sciences (Institute for Mechanization and Machine Design), Department of Machine Structures, Transport Systems and Logistics. In 2010, he defended his master’s thesis entitled “Development of Analytical–Numerical Procedures for Determining the Dynamic Behavior of Lifts”. On 22 March 2016, he defended his doctoral dissertation, titled “Investigation of Dynamics and Development of Vertical Transport Machines Using Numerical–Experimental Methods”, and was awarded the academic title of Doctor of Technical Sciences in the field of Mechanical Engineering.

From 1 April 2003 until 2004, he worked as a Research Fellow–Scholar on the project “Research and Development of Passenger Electric Lifts”, funded by the Ministry of Science, Technology and Development of the Republic of Serbia. From 2004 until 1 January 2007, he continued his work in the same capacity on the project “Research and Development of Electrically Powered Internal Transport Equipment (Forklifts and Electric Platforms)”, also funded by the Ministry.

He was elected Teaching Associate in the narrow scientific field of Food Engineering on 28 December 2006. From 24 April 2009 to 27 March 2015, he served as Assistant at the Faculty of Technical Sciences in Novi Sad in the field of Machine Structures, Transport Systems and Logistics. From 28 March 2015, he held the position of Lecturer in the field of Machine Elements, Mechanisms, Graphic Communication and Design, until he was elected Assistant Professor on 1 October 2016 in the field of Machine and Structural Design, Transport Engineering and Logistics. He was elected Associate Professor on 1 October 2021 in the same scientific field.

Radomir Đokić, PhD, has been involved in research activities of the Chair through several scientific and development projects, including the basic research project “Research and Development of Passenger Electric Lifts” (MIS 3.03.3214.B), funded by the Ministry of Science and Technology of the Republic of Serbia. He also participated in technological development projects: “Development, Design and Optimization of Systems and Structural Elements of Prefabricated Hall Supporting Structures” (TR-14057) and “Continuous Remote Monitoring of Vital Operational Parameters of Supporting Structures of Mobile On-Site Units Relevant to Service Life as a Factor of Reliability and Preventive Maintenance” (TR-14037). From 2011 to 2019, he was engaged in the project “Theoretical and Experimental Investigations of the Dynamics of Transport Machine Systems” (TR-35049), funded by the Ministry of Education, Science and Technological Development.

Since 2018, he has been a member of the Standards Committee KS M178 (Lifts, Escalators and Moving Walks). As part of the student and staff exchange program funded by WUS-Austria, he spent a research stay in 2005 at the Technical University of Vienna. In 2008, within the bilateral project “Integral Product Development”, funded by the Ministry of Science, he completed a research stay at the Faculty of Mechanical Engineering in Ljubljana.

His work includes the integration of software packages CATIA V5, Autodesk Inventor, MSC ADAMS and ANSYS for automated machine design, virtual prototyping and the simulation of transport systems and equipment. He is proficient in English and German.