Řada strojní. 2014, roč. 60 / Mechanical Series. 2014, vol. 60
Permanent URI for this collectionhttp://hdl.handle.net/10084/111979
Browse
Recent Submissions
Item type: Item , Detection and identification of people at a critical infrastructure facilities of trafic buildings(Vysoká škola báňská - Technická univerzita Ostrava, 2014) Pirník, Rastislav; Halgaš, Ján; Hruboš, Marián; Trabalík, JakubThis paper focuses on identification of persons entering objects of crucial infrastructure and subsequent detection of movement in parts of objects. It explains some of the technologies and approaches to processing specific image information within existing building apparatus. The article describes the proposed algorithm for detection of persons. It brings a fresh approach to detection of moving objects (groups of persons involved) in enclosed areas focusing on securing freely accessible places in buildings. Based on the designed algorithm of identification with presupposed utilisation of 3D application, motion trajectory of persons in delimited space can be automatically identified. The application was created in opensource software tool using the OpenCV library.Item type: Item , Kinematic analysis 6DOF delta manipulator(Vysoká škola báňská - Technická univerzita Ostrava, 2014) Pietrala, Dawid; Łaski, Paweł A.In the paper the solid and kinematic model of delta type parallel manipulator with six degrees of freedom is proposed. Method of determining the manipulator kinematics equations using the notation of Denavitt – Hartenberg is presented. For given movements of manipulator platform the trajectory of drives are illustrated. Also working space for various platform orientations are showed.Item type: Item , Temperature identification in the structural elements of non-contacting face seals by using Trefftz functions(Vysoká škola báňská - Technická univerzita Ostrava, 2014) Pawińska, Anna; Błasiak, SławomirPhenomena of the heat transfer in non-contacting face seals was described by partial differential equation of the second order and boundary conditions. In this way, the mathematical model was developed for the sealing rings. The distributions of temperature in the structural elements was obtained by the Trefftz method. It is a simple method of solving direct and inverse problems described by a homogeneous or an inhomogeneous partial differential equation. The main idea of the method is to determine functions satisfying a given differential equation (Trefftz functions) and to fit the linear combination of them to the governing boundary conditions.Item type: Item , An application of a pneumatic muscles actuator for a delta pneumatic manipulator(Vysoká škola báňská - Technická univerzita Ostrava, 2014) Łaski, Paweł A.; Błasiak, Sławomir; Takosoglu, Jakub E.The main aim of this study was to use pneumatic muscle actuators in the construction of the delta manipulator with a closed kinematic chain. The paper presents a solid models of the manipulator and the kinematic diagram. Based on the kinematic diagram and using DH notation (Denavit-Hartenberg) manipulator kinematic models was determined. On the basis of developed solid model simulation studies were conducted and the shape and size of the workspace determined. On the basis of 3D models prototype of the manipulator was constructed. Experimental studies were performed to select the regulators settings P, PI, PID for one of the pair of BMDS (Bi-Muscular Driving System) muscle-type drives. Based on integral quality indicators the used types of regulators were compared and proposed final controller. Performed experimental studies confirm the possibility of muscle control in the BMDS (Bi-Muscular Driving System) type system drives and tuning controller settings using the Ziegler-Nichols method.Item type: Item , Experimental problems of new constructions of portable submersible pumps for mining with electric motor cooled by water jacket(Vysoká škola báňská - Technická univerzita Ostrava, 2014) Korczak, Andrzej; Peczkis, Grzegorz; Synowiec, Tomasz; Altyntsev, EugeniuszThe article presents a new construction of a submersible pumping engine where new original solutions in flowing system and control system where introduced It let obtain high efficiency and fulfill user’s expectations. The article also contains experiments of the new pumping engine and their results. The results of numerical analysis of the movement of liquid in flowing channel is described and the analytical characteristics are compared with ones measured in laboratory. The work also presents the problems with constructing, research and certification of new submersible pumping engine which construction fulfils ATEX requirements for machines working in explosive conditions areasItem type: Item , Determination of the amount of usable waste heat in the production of corrugated cardboard(Vysoká škola báňská - Technická univerzita Ostrava, 2014) Janša, Jan; Richter, AlešMachines producing corrugated cardboard draw large amounts of thermal energy in the form of steam. In the Czech Republic, there are many such factories. This article deals with finding suitable parts of machines for the production of corrugated cardboard, from which the waste heat can be used, and determining the amount of heat.Item type: Item , Comparison of different mathematical models of cavitation(Vysoká škola báňská - Technická univerzita Ostrava, 2014) Homa, DorotaCavitation occurs during the flow when local pressure drops to the saturation pressure according to the temperature of the flow. It includes both evaporation and condensation of the vapor bubbles, which occur alternately with high frequency. Cavitation can be very dangerous, especially for pumps, because it leads to break of flow continuity, noise, vibration, erosion of blades and change in pump’s characteristics. Therefore it is very important for pump designers and users to avoid working in cavitation conditions. Simulation of flow can be very useful in that and can indicate if there is risk of cavitating flow occurrence. As this is a multiphase flow and quite complicated phenomena, there are a few mathematical models describing it. The aim of this paper is to make a short review of them and describe their approach to model cavitation. It is desirable to know differences between them to model this phenomenon properly.Item type: Item , Flow rate analysis of 3/2 directional pneumatic valve by means of Ansys CFX software(Vysoká škola báňská - Technická univerzita Ostrava, 2014) Błasiak, Sławomir; Takosoglu, Jakub E; Łaski, Paweł A.The main purpose of this paper was to develop a selection method of the pneumatic connectors for directional 3/2 valve. The method was established to minimize resistance and loss of pressure in the valve with mounted pneumatic connections for the selected pipe diameters. Directional valve was modeled in 3D CAD software SolidWorks while 3D models of the air connections have been downloaded from the website of one of the leading suppliers of pneumatic. Based on developed solid model the simulation of compressed air flow in the software for computational fluid dynamics Ansys CFX was conducted. The studies using CFD methods helped to determine which air connections best meet the assumptions. Performed numerical tests enable proper selection of items to the newly designed pneumatic systems for a particular group of valves. As a consequence, this translates into a reduction in energy consumption and improve the efficiency of the entire pneumatic complex system.Item type: Item , Design and construction of a robotic vehicle with omni-directional Mecanum wheels(Vysoká škola báňská - Technická univerzita Ostrava, 2014) Vachálek, Ján; Tóth, Filip; Krasňanský, Pavol; Čapucha, ĽubomírThe paper deals with the design and construction of a universal robotic vehicle prototype, used for laboratory and educational purposes. The main goal is its use as a technology demonstrator for the needs of students, therefore it is equipped with several kinds of sensors and universal advanced control technologies and design solutions. Its basis is a control system and construction concept using mobile battery gear and omnidirectional Mecanum wheels. A manipulating arm and advanced tracking and spatial navigation systems are also components of the design. Since the problem of a customized design and construction of such a robotic vehicle is very complex and solved in various scientific fields, in this paper we will mainly focus on the detailed description of the control systems and subsystems of the vehicle.Item type: Item , Laboratory set-up design for testing vibration suppression algorithms with time delays(Vysoká škola báňská - Technická univerzita Ostrava, 2014) Pilbauer, Dan; Bušek, Jaroslav; Kučera, Vladimír; Vyhlídal, TomášVibrations occur in wide field of application in mechanical engineering hence developing new and advanced algorithms is useful. For practical verification of theoretical control algorithms it is necessary not only to simulate them, but also to test them in laboratory conditions at least. This article describes design of multipurpose laboratory set-up for testing active vibration control algorithms which consists of series of carts connected to each other on linear guides. Carts are equipped with accelerometers and position sensors for feedback control. Linear electric motors on the carts are used for suppressing vibration. The laboratory set-up is controlled by Matlab/Simulink via DAQ card connected to PC. Next to the set-up itself, two control algorithms intended for testing are presented in this article. First, principle of algorithm of resonator absorber with delayed acceleration feedback is described. Furthermore algorithm using input shaping for pre-compensating the oscillatory modes of the system is presented. By adding time delays into closed loop it becomes an infinite dimensional and in this case different approach than in conventional methods is needed. Finally some successful simulation results are presented as a part of practical experiment preparation.Item type: Item , Analysing of sealing properties on a bolted joint with a steel gasket by using finite element method(Vysoká škola báňská - Technická univerzita Ostrava, 2014) Maťas, Martin; Novák, Pavol; Balco, PavolThis article deals with study of contact pressure/gap distribution on a bolted joint of a hydrostatic transmission. The study was performed via numerical analyses with support of ANSYS a finite element method software package. The main focus in the results evaluation is aimed on evaluation of the contact pressure/gap on the bolted joint after tightening individual bolts and after applying operational loads on the hydrostatic unit. Operational loads in the analyses were represented by applying of an operational pressure into the individual areas of the unit. The operational pressure was applied in two time steps of the Finite Element Method analysis to simulate normal and reverse mode of the hydrostatic transmission. Numerical results were verified through experimental measurements carried out by using FujiFilm tests.Item type: Item , Refuse-derived fuel energy recovery by plasma technology(Vysoká škola báňská - Technická univerzita Ostrava, 2014) Lázár, Marián; Lengyelová, Marta; Čarnogurská, Mária; Širillová, ĽubomíraThe paper reports the results of experiments focused upon high temperature gasification of waste with a significant proportion of combustibles. This is refuse-derived fuel (RDF) obtained by sorting the combustible components of communal waste. During the gasification of this waste in a plasma reactor (with a waste humidity of circa 24.9 %), when calculated per 1 kg of waste, syngas was obtained in an amount of 1.35 to 1.84 m3∙kg-1. Apart from gas, the gasification process also creates slag of a glassy structure suitable for further use.Item type: Item , CFD modeling two-phase flow in the rotationally symmetric bodies(Vysoká škola báňská - Technická univerzita Ostrava, 2014) Krutil, Jaroslav; Pochylý, František; Fialová, SimonaThe work summarizes the basic findings which result from numerical modelling of flow at the mixture of air and water, with consideration of laminar and turbulent flow. The attention is focused on the development of the velocity profile of the liquid, depending on adhesion coefficient and the degree of hydrophobicity of the surface. We considered the geometry of a straight circular pipe cal and horizontal position. The solution focuses on the finite element method and the tool utilized to evaluate the results was numerical program ANSYS Fluent.Item type: Item , The tilt of the elevator shaft of bunker Skutina(Vysoká škola báňská - Technická univerzita Ostrava, 2014) Kalenda, Pavel; Neumann, LiborThe measurement of deformations of the elevator shaft in the Skutina fortress between the 2nd floor and the depth of 33 m below the surface took place in 2009. These measurements showed that, in addition to the tides, the diurnal thermoelastic wave deforms the body of the bunker, particularly in the NS direction. The amplitude of this deformation depends mainly on the cloudiness (opposite to the irradiance). Morning and evening deformation curves depend mainly on the time of sunrise and the geometry of the body of the bunker (irradiance of the bunker walls) and less of the outside temperature.Item type: Item , Flow in the non-return flap(Vysoká škola báňská - Technická univerzita Ostrava, 2014) Jablonská, Jana; Kukelka, Jiří; Petrovič, MatějThe essay concerns issues connected with modelling of flow in a non-return flap and determination of force effects on the flap disc. The task was researched in collaboration with ARMATURY Group, a.s. The flow is on-compressible and the flow medium is water. Boundary conditions determined by a measurement were applied in the modelling.The target of the project is finding a suitable mathematical model and comparison of the measured and calculated values dissipation factor of the non-return flap for various opening angles of the flap disc.Item type: Item , Expert system as prevention of falls in medical centers(Vysoká škola báňská - Technická univerzita Ostrava, 2014) Hruboš, Marián; Hrubošová, Lenka; Janota, AlešThe topicof this work is prevention of patient falls in medical centers focused on risk assessment. In this work we want to introduce some basic terms about falls, define risk of falls focused on qualitative and quantitative risk assessment methods, define the main causes of falls and propose appropriate methods to eliminate the influences acting on the incidence of falls. Based on risk analysis we have designed an expert system, which provides information to healthcare professionals abou the potential risk factors affecting the incidence of falls among hospitalized patients, and directly proposes countermeasures to reduce these risk factors. SW implementation was solved using a freeware program EXSYS. This software can be distributed to individual departments in medical centers to facilitate the identification of possible causes of falls in patients.Item type: Item , Numerical model of air valve for computation of one-dimensional flow(Vysoká škola báňská - Technická univerzita Ostrava, 2014) Himr, DanielThe paper is focused on a numerical simulation of unsteady flow in a pipeline. The special attention is paid to a numerical model of an air valve, which has to include all possible regimes:critical/subcritical inflow and critical/subcritical outflow of air. Thermodynamic equation of subcritical mass flow was simplified to get more friendly shape of relevant equations , which enables easier solution of the problem.Item type: Item , Tracking of vehicle movement on a parking lot based on video detection(Vysoká škola báňská - Technická univerzita Ostrava, 2014) Halgaš, Ján; Pirník, Rastislav; Šarina, TomášThis article deals with topic of transport vehicles identification for dynamic and static transport based on video detection. It explains some of the technologies and approaches necessary for processing of specific image information (transport situation). The paper also describes a design of algorithm for vehicle detection on parking lot and consecutive record of trajectory into virtual environment. It shows a new approach to moving object detecti on (vehicles, people, and handlers) on an enclosed area with emphasis on secure parking. The create dapplication enables automatic identification of trajectory of specific objects moving within the parking area. The application was created in program language C++ with using an open source library OpenCV.Item type: Item , The scalar, vector and tensor fields in theory of elasticity and plasticity(Vysoká škola báňská - Technická univerzita Ostrava, 2014) Fojtík, František; Halama, RadimThis article is devoted to an analysis of scalar, vector and tensor fields, which occur in the loaded and deformed bodies. The aim of this article is to clarify and simplify the creation of an understandable idea of some elementary concepts and quantities in field theories, such as, for example equiscalar levels, scalar field gradient, Hamilton operator, divergence, rotation and gradient of vector or tensor and others. Applications of those mathematical terms are shown in simple elasticity and plasticity tasks. We hope that content of our article might help technicians to make their studies of necessary mathematical chapters of vector and tensor analysis and field theories easier.Item type: Item , Modeling and Design of Mechatronic Control Preheating Foundry Mold as a System with Distributed Parameters(Vysoká škola báňská - Technická univerzita Ostrava, 2014) Bartalský, Lukáš; Hulkó, GabrielThe article deals with modelling and control of preheating of mechatronics foundry mold as a system with distributed parameters. At the beginning of article the fundamental structures of distributed parameters systems are described. The mechatronics foundry mold and simulation model of it in COMSOL Multiphysics are described in the next part of article. Article also described the system identification of mold by using the process responses in MATLAB Identification Toolbox. Subsequently deals with the simulation control loop by using DPS Blockset for MATLAB & Simulink.