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Besim Demirović

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The paper presents a simultaneous numerical analysis of the geometric and material nonlinearity of the beams. It describes a process of determining the bearing capacity of a stratified cross-section of a beam made of homogeneous and isotropic material in linear and nonlinear domains of material behaviour. Material nonlinearity is analysed by the variation of the cross-sectional stiffness of the beam on bending EI in the stiffness matrix of the system obtained according to the first-order theory. Geometric nonlinearity is introduced into the calculation using the geometric stiffness matrix of the system. Numerical examples present an application of the procedure for solving problems of nonlinear structure analysis. The calculation results obtained in accordance with the procedure described in the paper are compared with the results of the SCIA software package.

The paper presents a calculation of a system supported on piles according to the second order theory. The influence of piles as supports on the structure is replaced by elastic supports. In the numerical model, the supports are modeled as elastic springs. To compare the calculation results, a system based on rigid and deformable supports was analyzed. The analysis of the system was performed according to the first order theory and the second order theory, which introduces geometric nonlinearity into the calculation. The process of soil modeling around a pile with replacement springs is presented. The applicability of the described procedure is shown in a numerical example. The comparison of the calculation results was done on numerical models of systems with rigid and elastic supports.

The paper presents a procedure for numerical modelling of the rod cross-section bearing capacity. Equilibrium between cross sectional forces and cross-sectional stresses is determined by iterative procedures. According to the described procedure, the load-bearing capacity of the cross-section is determined according to the isotropic linear and nonlinear behavior of the material, for homogeneous and inhomogeneous cross-sections. The nonlinear behavior of the material reduces the stiffness of the cross section of the rod EA and EI, with a significant increase in the deformation values ε and κ. The applicability of the calculation and analysis of obtained results is presented using numerical examples.

Summary: The paper presents a procedure for numerical modelling of the geometric nonlinearity of a rod. The calculation of cross-sectional forces, displacements and rotations of nodes was done by iterative methods on a deformed system. By the described procedure, the equilibrium state is established in the finite position of the rod. In the process of deformation, there is an increase in cross-sectional forces and deformation of the rod. The presented calculation methods are used to model geometric nonlinearity with constant and variable stiffness of the cross section of the rod. The calculations were done numerically, and the results were controlled using the SCIA software package. Through numerical examples, the calculation procedure was presented and the analysis of the results was performed.

The paper shows the calculation of the system by second order theory on elastic supports. At the calculate it adopted a linear relationship of stress-displacement soil. The method of calculating the beams based on rigid and deformed supports was presented by introducing geometric nonlinearity into the calculate. Expressions were performed for the rigidity of the supports in the vertical direction and on the rotation of the foundation, due to the elastic deformation of the soil. Numerical examples show the application of the procedure described. Through diagrams and charts of static and deformation, a comparison of calculate results was made.

This paper presents a numerical analysis of a reinforced concrete beam in which the concrete and reinforcement are above the yield strength of the material. Further, the procedure for determining the relationship between the cross-sectional forces and the deformations of the layered cross-section of a rod is described. For a short rod with reduced stiffness of the EI and EA cross-sections, a stiffness matrix with variable members is formed. The applicability of the proposed analysis method for the material nonlinearity in a beam calculation is demonstrated through a numerical example. The aim of the present paper is to show the flow of plastification and the load deformation of the system nodes. Finally, the results of the manual deformation calculation system are compared with the results from SCIA software.

L. Kaminsky, Jy-Jen F. Sah, Besim Demirović, Pinaki Gupta

a system and method for controlling a Kupplungsfullbefehls are created on the basis of the hydraulic state of an on-coming clutch. A vehicle includes a hydraulically actuated on-coming clutch, which is configured to be engaged during a shifting event of an operating mode of the vehicle to another. A controller is configured to generate a start time of a Kupplungsfullbefehl in such a way that the conclusion of Kupplungsfullbefehls is synchronized with an identified speed profile of the incoming clutch. The on-coming clutch defines a hydraulic state in real time when the Kupplungsfullbefehl is generated. The controller is configured to generate at least partly on the basis of the hydraulic state in real time of the incoming clutch an acceptable speed margin in real time for the on-coming clutch. The controller is configured to cancel the Kupplungsfullbefehl if a rotational speed in real time (an actual clutch slip speed or an actual clutch speed profile) of the incoming clutch outside of an acceptable speed margin is located in real time.

Besim Demirović, Pinaki Gupta, L. Kaminsky, Ali K. Naqvi, A. Heap, Jy-Jen F. Sah

A hybrid transmission comprising a first and second electrical machine. A method of operating the hybrid transmission in response to a command, a switch from a continuously variable output mode to a continuously variable target mode execute, comprises increasing torque of the on-coming clutch associated with the operation in the continuously variable target mode, and a corresponding reducing a torque of an off-going clutch associated with the operation in the continuous output mode. When deactivating the off-going clutch torque outputs of the first and second electric machine and the torque of the on-coming clutch are controlled in order to synchronize the on-coming clutch. When synchronization of the on-coming clutch torque of the on-coming clutch is increased and the transmission is operated in the continuously variable target mode.

Besim Demirović, Zijad Požegić, S. Kovač, Safet Kapo, Haris Alič, G. Manic, N. Djuric, Kristina Saric, Dijana Djuric et al.

Parallel programming is a form of computation in which the calculations are carried out simultaneously, operating on the principle where large problems can be divided into smaller, which are then solved in parallel. Most common this programming is used in high performance computing, but due to the physical constraints which prevent frequency scaling the interest is even higher. As computers consumption has become a problem in the recent years, the parallel programming has grown into the dominant paradigm in computer architecture, mainly in the form of multicore processors. The paper shows the process of designing parallel programs and it includes some results obtained by testing the parallel programming performance of different nVIDIA GeForce graphics cards. The purpose of the test is to compare performance of several types of GPUs for various applications. The results of the test could not specifically say which GPU is best due to the different features of the cards, but they can be used to determine which card offers better performances for different parts of the tests.

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