Iskanje po katalogu digitalne knjižnice

Opis: Numerical simulations play a vital role in the modern engineering industry, especially when faced with interconnected challenges such as particle interactions and the structural integrity of conveyor systems. This article focuses on the handling of materials and emphasizes the importance of using parametric numerical analysis to improve efficiency, reduce wear, and enhance the structural integrity of horizontal screw conveyors. Through the utilization of the Design of Experiments, we systematically investigated critical parameters such as screw pitch, clearance, wear, rotational velocity, and additional structural factors. This examination was carried out within a well-defined parametric framework, utilizing a combination of software tools provided by the Ansys suite and Minitab. The findings demonstrate the effectiveness of the Design of Experiments analysis in achieving improved performance and provide valuable insights for engineers and researchers involved in the design of conveyor systems. Furthermore, this comprehensive approach clarifies how conveyor systems respond to changes in parameters and highlights the complex interaction between transported particles and the conveyor system. We present a detailed analysis that clarifies the complex relationships and dependencies among different parameters, providing engineers and researchers with valuable insights. By understanding the interactions of these factors, the methodology provides not only results but also a strategic framework for advancing conveyor system design and engineering practices.
Ključne besede: discrete element method, design optimization, horizontal screw conveyors, parametric study, conveying equipment, bulk handling, bulk solids, abrasive wear, screw conveyor, FEA, performance analysis
Objavljeno v DKUM: 09.04.2024; Ogledov: 275; Prenosov: 44
Celotno besedilo (10,51 MB)
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Opis: V magistrskem delu je predstavljen projekt buildingSMART IFC Bridge, katerega rezultat je podatkovna shema IFC 4x2 Draft1. Osredotočili smo se na konceptualne sklope za mostove in preverili skladnost funkcionalnosti aplikacij Allplan in Allplan Bridge s shemo. V ta namen je bil izdelan informacijski model mostu M1 v Marija Gradcu. V zaključnem delu magistrske naloge so predstavljeni predlogi za izboljšave aplikacij Allplan Bridge in Allplan.
Ključne besede: IFC Bridge, bridges, Allplan Bridge, parametric modelling
Objavljeno v DKUM: 11.10.2019; Ogledov: 1392; Prenosov: 260
Celotno besedilo (4,71 MB)

Opis: This Master's Thesis explores the concept of the New Berane Airport that will serve as a turning point for improving the winter tourism offer of Montenegro and the region, thereby attracting a greater number of tourists to the country. The new facility must follow the guidelines of modern architecture, modern design, and the surrounding mountain landscapes, which represents an additional challenge in terms of construction and design. The main aim is to create an efficient structure, a new regional aviation centre, with well-designed transport links that will meet the needs of a large number of passengers and visitors from the region and the rest of the world. The visual aspects of the structure must be in line with the dominant type of architecture in the municipality of Berane, which is why the use of local materials and traditional elements has been foreseen. The new urban plan will follow the existing plan, although its capacity and content will be expanded in accordance with the former plans for the airport. In the planning phase, appropriate use of airport and traffic manuals is essential.
Ključne besede: airport, architecture, concrete, shell roof, glass facade, tourism, transport, parametric design, regional centre, Berane
Objavljeno v DKUM: 15.06.2018; Ogledov: 1366; Prenosov: 383
Celotno besedilo (38,54 MB)

Opis: This paper extends the parametric magneto-dynamic model of soft magnetic steel sheets to account for the phase shift between local magnetic flux density and magnetic field strength. This phase shift originates from the damped motion of domain walls and is strongly dependent on the microstructure of the material. In this regard, two different approaches to include the rate-dependent effects are investigated: a purely phenomenological, mathematical approach and a physical-based one.
Ključne besede: magnetic hysteresis, eddies, magnetic flux, viscosity, magnetic fields, magneto-dynamic models, parametric
Objavljeno v DKUM: 03.08.2017; Ogledov: 1262; Prenosov: 438
Celotno besedilo (567,72 KB)
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Opis: We study the one-dimensional time-dependent Hamiltonian systems and their statistical behaviour, assuming the microcanonical ensemble of initial conditions and describing the evolution of the energy distribution in three characteristic cases: 1) parametric kick, which by definition means a discontinuous jump of a control parameter of the system, 2) linear driving, and 3) periodic driving. For the first case we specifically analyze the change of the adiabatic invariant (the canonical action) of the system under a parametric kick: A conjecture has been put forward by Papamikos and Robnik (2011) that the action at the mean energy always increases, which means, for the given statistical ensemble, that the Gibbs entropy in the mean increases (PR property). By means of a detailed rigorous analysis of a great number of case studies we show that the conjecture largely is satisfied, except if either the potential is not smooth enough (e.g. has discontinuous first derivative), or if the energy is too close to a stationary point of the potential (separatrix in the phase space). We formulate the conjecture in full generality, and perform the local theoretical analysis by introducing the ABR property. For the linear driving we study first 1D Hamilton systems with homogeneous power law potential and their statistical behaviour under monotonically increasing time-dependent function A(t) (prefactor of the potential). We used the nonlinear WKB-like method by Papamikos and Robnik J. Phys. A: Math. Theor., 44:315102, (2012) and following a previous work by Papamikos G and Robnik M J. Phys. A: Math. Theor., 45:015206, (2011) we specifically analyze the mean energy, the variance and the adiabatic invariant (action) of the system for large time t→∞. We also show analytically that the mean energy and the variance increase as powers of A(t), while the action oscillates and finally remains constant. By means of a number of detailed case studies we show that the theoretical prediction is correct. For the periodic driving cases we study the 1D periodic quartic oscillator and its statistical behaviour under periodic time-dependent function A(t) (prefactor of the potential). We compare the results for three different drivings, the periodic parametrically kicked case (discontinuous jumps of $A(t)$), the piecewise linear case (sawtooth), and the smooth case (harmonic). Considering the Floquet map and the energy distribution we perform careful numerical analysis using the 8th order symplectic integrator and present the phase portraits for each case, the evolution of the average energy and the distribution function of the final energies. In the case where we see a large region of chaos connected to infinity, we indeed find escape orbits going to infinity, meaning that the energy growth can be unbounded, and is typically exponential in time. The main results are published in two papers: Andresas, Batistić and Robnik Phys. Rev. E, 89:062927, (2014) and Andresas and Robnik J. Phys. A: Math. Theor., 47:355102, (2014).
Ključne besede: one-dimensional nonlinear Hamiltonian systems, adiabatic invariant, parametric kick, periodic driving, linear driving, energy distribution, WKB method, action
Objavljeno v DKUM: 02.03.2015; Ogledov: 3309; Prenosov: 127
Celotno besedilo (11,07 MB)