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Zoran Bucevac,Radisa Jovanovic 제어·로봇·시스템학회 2016 International Journal of Control, Automation, and Vol.14 No.3
Linear time-invariant discrete-time plant, with no restrictions on the form of the state equation andwith scalar control, is considered. The exponentially stabilizing state feedback control algorithm is developed byLyapunov’s second method leading to the variable structure system with chattering free sliding modes. Essentially,the control algorithm drives the system from an arbitrary initial state to a prescribed so-called sliding subspace S, infinite time and with prescribed velocity estimate. Inside the sliding subspace S, the system is switched to the slidingmode regime and stays in it forever. The proposed algorithm is tested on the real system in practice, direct current(DC) servo motor, and simulation and experimental results are given. Also, it is compared with another alreadyknown algorithm from literature.
Zoran Bonic´,Nebojsˇ a Davidovic´,Todor Vacev,Nikola Romic,Elefterija Zlatanovic´,Jelena Savicˇ 한국콘크리트학회 2017 International Journal of Concrete Structures and M Vol.11 No.4
Punching shear resistance of column footings and foundation slabs varies significantly in different standards. The reason for this is because standards define differently the position of the critical perimeter in which the punching shear resistance should be determined, and quantify the influences of the main parameters like effective depth, shear slenderness, compressive strength of concrete, longitudinal reinforcement ratio and tension yield stress of reinforcement in different ways. In order to quantify the level of safety in Eurocode 2 and in fib MC 2010, their design results are compared with the test results of the series of footings tested in completely realistic boundary conditions in terms of the subgrade soil. Besides the performed tests results, the analysis of the other investigations of the footing punching rested on the real soil is also included. Thus was obtained the answer to the question how individual characteristics of the footings and of the soil affect the punching bearing resistance and how accurately Eurocode 2 and fib MC 2010 predict the bearing capacity of the tested column footings. At the end, based on the test results and on the tests of others, and on and performed numerical analyses, a possible modification of Eurocode 2 in the field of reinforced concrete footing was proposed.
CFD study of the PTS experiment in ROCOM test facility
Carija, Zoran,Ledic, Fran,Sikirica, Ante,Niceno, Bojan Korean Nuclear Society 2020 Nuclear Engineering and Technology Vol.52 No.12
With the aging of nuclear reactors, embrittlement of the reactor pressure vessel (RPV) steel, as a consequence of routine operations, is highly probable. To ensure operational integrity and safety, prediction and mitigation of compromising damage, brought on by pressurized thermal shock (PTS) following an emergency procedure, is of utmost importance. Computational fluid dynamics (CFD) codes can be employed to predict these events and have therefore been an acceptable method for such assessments. In this paper, CFD simulations of a density driven ECC state in the ROCOM facility are analyzed. Obtained numerical results are validated with the experimental measurements. Considerable attention is attributed to the boundary conditions and their influence, specifically outlet definitions, in order to determine and adequately replicate the non-active pumps in the facility. Consequent analyses focused on initial conditions as well as on the temporal discretization and inner iterations. Disparities due to different turbulent modelling approaches are investigated for standard RANS models. Based on observed trends for different cases, a definitive simulation setup has been established, results of which have been ultimately compared to the measurements.