153 | Fascicule 1 ANNALS of Faculty Engineering Hunedoara – International Journal of Engineering Tome XIV [2016] – Fascicule 1 [February] ISSN: 1584-2665 [print; online] ISSN: 1584-2673 [CD-Rom; online] a free-access multidisciplinary publication of the Faculty of Engineering Hunedoara 1. Beqir HAMIDI, 2. Naser LAJQI, 3. Shpetim LAJQI, 4. Lindita HAMIDI THE DYNAMIC MODELING OF A SUBSYSTEM FOR THE UPPER SUPPORTING STRUCTURE OF A BUCKET WHEEL EXCAVATOR 1-4. University of Prishtina “Hasan Prishtina”, Faculty of Mechanical Engineering, Prishtina, KOSOVO ABSTACT: This paper presents the problem of forming a dynamic model for supporting the structure of a bucket wheel excavator. Application of the Finite Elements Method arrived at a local linearism of equations regarding a dynamic elastic line for supporting the structure of a bucket wheel excavator under real working conditions. During the formation of this dynamic model, rods of spatial truss as constructive elements were treated as support with continual masses. The case of forming a dynamic model for the subsystem is explained in detail, as well as the phase of choosing the generalized coordinates of the system. Then, the selected nodes of the reference system, the degrees of freedom and the dynamic parameters of a reduced model were determined. Verification of the reduced model was carried out by comparing the results of their frequencies with those obtained by Finite Element, then selecting the reference nodes and degrees of freedom, according to the requirements of the problem posed. This model was designed with twenty degrees of freedom which obtained results which were very similar to the reduced model with two degrees of freedom. Keywords: Supporting structure, spatial truss, frequencies, and potential energy 1. INTRODUCTION Over recent decades earthmovers, especially bucket wheel excavators as continuous excavation machines, being the first and main components in bucket wheel excavator-conveyors'-stacker systems influencing other components and the largest structures in earth-based technology, have become progressively larger and their mechanisms more efficient, Bošnjak et al [1]. Dynamic modelling of those bucket wheel excavators which are used during surface mining presents a very complex problem and a considerable number of scientific researchers have investigated this problem but very little research has been done until now on the supporting structure of the bucket wheel excavator. Volkov, Çerkasov [2], discussed a number of problems of the dynamics of bucket wheel excavators in system excavator-belt-folding. These authors also examined the problems of vibration regarding the supporting structures of excavator with unlimited numbers of degrees of freedom. Rubinstein [3], reviewed the form of acquiring dynamic elastic line. Vladimirov [3], based on the results of many experiments, gives analysis of bucked wheel excavator loads that caused during to the mine, for the same parcel of land. Figure 1. Bucket Wheel Excavator, SchRs 1760 x 32/5