Acta Polytechnica. 2021, vol. 61: Recent submissions

Now showing items 41-60 of 72

    • NUMERICAL SIMULATION OF A SINGLE RING INFILTRATION EXPERIMENT WITH hp-ADAPTIVE SPACE-TIME DISCONTINUOUS GALERKIN METHOD 

      Author: Dolejší, Vít; Kuráž, Michal; Solin, Pavel
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      We present a novel hp-adaptive space-time discontinuous Galerkin (hp-STDG) method for the numerical solution of the nonstationary Richards equation equipped with Dirichlet, Neumann and seepage face boundary conditions. The ...

    • Performance characteristics of Hopkinson’s set-up pneumatic launcher 

      Author: Sobczyk, Kamil; Kruszka, Leopold; Chmielewski, Ryszard; Rekucki, Ryszard
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      The paper presents a performance characteristics of a pneumatic launcher, which is an important element of the split Hopkinson bar set-up (SHPB) at the Department of Military Engineering and Infrastructure (the Military ...

    • Stationary solutions of incompressible viscous flow in a wall-driven semi-circular cavity 

      Author: Erturk, Ercan
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      Stationary numerical solutions of incompressible viscous flow inside a wall-driven semicircular cavity are presented. After a conformal mapping of the geometry, using a body-fitted mesh, the Navier-Stokes equations are ...

    • PERFORMANCE OF SUSTAINABLE GREEN CONCRETE INCORPORATED WITH FLY ASH, RICE HUSK ASH, AND STONE DUST 

      Author: Siddika, Ayesha; Amin, Md. Ruhul; Rayhan, Md. Abu; Islam, Md. Saidul; Mamun, Md. Abdullah Al; Alyousef, Rayed; Amran, Y. H. Mugahed
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      The performance of a sustainable green concrete with fly ash (FA), rice husk ash (RHA), and stone dust (SD) as a partial replacement of cement and sand was experimentally explored. FA and RHA have a high silica content, ...

    • EXTERNAL ROLLING OF A POLYGON ON CLOSED CURVILINEAR PROFILE 

      Author: Pylypaka, Serhii F.; Klendii, Mykola B.; Trokhaniak, Viktor I.; Kresan, Tetiana A.; Hryshchenko, Iryna Y.; Pastushenko, Andrii S.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      The design of a helical surface tillage tool made of a developable helicoid section has been calculated using the methods of analytical and differential geometry, the theory of surfaces, the systems of computer-generated ...

    • NEW METHOD EVALUATION OF DETAIL MATERIAL AND HEAT FLOWS FOR SINGLE STRING CEMENT CLINKER PLANT 

      Author: Darmanto, Prihadi Setyo; Astina, I Made; Wardhana, Alfian Kusuma; Amalia, Alfi; Syahlan, Arief
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      Material flow in each main equipment of a cement clinker plant, which is very useful for controlling the process, is impossible to be measured during operation due to very high temperatures. This paper intends to overcome ...

    • AN ANALYSIS OF THE LIQUID FILMS BREAK-UP USING THE COMPUTER VISION TECHNIQUE 

      Author: Měšťanová, Lucie; Bartoš, Ondřej
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      The aim of this paper is to introduce a novel approach for analysing the droplet formation in a transonic flow. The method suggested in this work is based on the combination of the measured data from the wind tunnel by an ...

    • STRESS ANALYSIS AND TOPOLOGY OPTIMIZATION OF A CHAIN BUCKET ELEVATOR USING ANSYS 

      Author: Yin, Edward; Seckley, Emmanuel M.; Asiedu, Evans Kesse; Cobbinah, Stephen
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      A failure of conveyor chain links in a production process can cause unscheduled shutdowns, which increase the throughput time coupled with damaged buckets and chain links, which increase maintenance and repair costs. Since ...

    • DESIGN OPTIMIZATION OF MOVEABLE MOMENT STABILIZATION SYSTEM FOR ACCESS CRANE PLATFORMS 

      Author: Ermis, Kemal; Caliskan, Mehmet; Tanriverdi, Muammer
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      The popularity of aerial work platforms is rapidly increasing in the mechanization industry. As a result, the safety and structural strength of aerial work platforms should be prioritized.In this study, the mathematical ...

    • EVALUATION OF REFLECTANCE FOR BUILDING MATERIALS CLASSIFICATION WITH TERRESTRIAL LASER SCANNER RADIATION 

      Author: Costantino, Domenica; Pepe, Massimiliano; Angelini, Maria Giuseppa
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      The main purpose of this work is the evaluation of the potential of Terrestrial Laser Scanning (TLS) technology to perform a reflectance analysis of scanned objects. A laser beam, having a coherent beam in the field of ...

    • EFFECTS OF DESIGN PARAMETERS ON STATIC EQUIVALENT STRESS OF RADIAL ROLLING BEARINGS 

      Author: Bozca, Mehmet
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      The aim of this study is to theoretically investigate the effects of design parameters on the static equivalent stress of radial rolling bearings, such as the point contact case for ball bearings and line contact case for ...

    • ON THE THREE-DIMENSIONAL PAULI EQUATION IN NONCOMMUTATIVE PHASE-SPACE 

      Author: Haouam, Ilyas
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      In this paper, we obtained the three-dimensional Pauli equation for a spin-1/2 particle in the presence of an electromagnetic field in a noncommutative phase-space as well as the corresponding deformed continuity equation, ...

    • SIMULATION OF A MANEUVERING AIRCRAFT USING A PANEL METHOD 

      Author: Schoř, Pavel; Kouřil, Martin; Daněk, Vladimír
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      We present a method for numerical simulations of a maneuvering aircraft, which uses a first-order unsteady panel method as the only source of aerodynamic forces and moments. By using the proposed method, it is possible to ...

    • APPLICATION OF GLOBAL OPTIMIZATION TO PREDICT STRAINS IN RC COMPRESSED COLUMNS 

      Author: Lechman, Marek; Stachurski, Andrzej
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      In this paper, the results of an application of global and local optimization methods to solve a problem of determination of strains in RC compressed structure members are presented. Solutions of appropriate sets of nonlinear ...

    • Use of thermal analysis for the detection of calcium oxalate in selected forms of plastering exposed to the effects of Serpula lacrymans 

      Author: Cígler Žofková, Drahomíra; Frankl, Jiří; Frankeová, Dita
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      The article discusses the interaction of metabolic products of a wood-destroying fungus of the dry rot species (Serpula lacrymans (Wulfen) P. Karst.) with a commonly used lime mortar. Mortar samples used in the presented ...

    • Assessment of the effectiveness of lubrication of Ti-6Al-4V titanium alloy sheets using radial basis function neural networks 

      Author: Trzepieciński, Tomasz; Szpunar, Marcin
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      The aim of the research presented in this article was to determine the value of the friction coefficient using a simple tribological test and to build an empirical model of friction with the use of radial basis function ...

    • An Investigation of corrosion of friction welded and post-weld heat-treated AA6061/SiC/graphite hybrid composites 

      Author: Senthilkumar, Jadamuni; Kumar, Pavan S. M.; Balasubramanian, Manickam
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      The aluminium-based hybrid metal matrix composites have noteworthy applications in sub-sea installations, structures of deep-sea crawlers, submarine parts, engine cylinders, drum brakes etc., as they possess high strength, ...

    • Utilization of agricultural waste adsorbent for the removal of lead ions from aqueous solutions 

      Author: Yusuff, Adeyinka Sikiru; Popoola, Lekan Taofeek; Anochie, Victor
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      This work investigated the potentiality of using chemically modified onion skin waste (CMOSW) as an adsorbent for the removal of lead ions (Pb2+) from an aqueous solution. The material properties were characterized using ...

    • The impact of the air temperature on measuring the zenith angle during the year in the ground layer of the atmosphere for the needs of engineering surveying 

      Author: Suk, Tomáš; Štroner, Martin
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      This paper presents the results of over a year-long experiment dealing with a temperature measurement to calculate the theoretical effect of the atmosphere on the measured zenith angle in engineering surveying. The ...

    • Marine diesel engines operating cycle simulation for diagnostics issues 

      Author: Minchev, Dmytro S.; Varbanets, Roman A.; Alexandrovskaya, Nadiya I.; Pisintsaly, Ludmila V.
      (České vysoké učení technické v PrazeCzech Technical University in Prague, 2021)
      The ongoing monitoring of marine diesel engines helps to detect the deviations of its parameters early and prevent major failures. But the experimental diagnostics data are generally limited, so frequently, it isn’t possible ...