Acta Mechanica Slovaca, 2010 (vol. 14), issue 1
The Influence of Shape for Self-Reconfigured Modular Robotic System Characteristics
František Trebuňa, Juraj Smrček, Zdenko Bobovský
Acta Mechanica Slovaca 2010, 14(1):6-13 | DOI: 10.2478/v10147-011-0001-4 
The theory of mechanisms with a variable structure into the application form of the metamorphous self-reconfigurable structure of robots has been recently developed as a possible direction of an innovative approach to robotic technology. In our faculty, we decide to create module for such robotic system. The result is a unique MMR metamorphous robotic system on the basis of an autonomous MG module which is able to act as a homogenous module, however, at the same time it consists of heterogeneous sub-modules which enable the module to cooperate with other modules and thus create and be transformed into various kinematics structures of robotic system,...
Applied Aspects of the Leadership in the Bussiness Unit
Iliev Tsvetan
Acta Mechanica Slovaca 2010, 14(1):14-19 | DOI: 10.2478/v10147-011-0002-3
At the present stage of development of the economy processes on a national and an international level, business organizations are facing lots of difficulties and challenges. The modern market has to be perceived not only as a place for selling products, but also as an opportunity for competition of potentials. As a result, the need of building a new model of development and management on a micro level i.e. on a level of economy unit has become an existing issue nowadays. This is a model, where the profit has to be a function not as much as of the produced volume and sold amount, but much more of the decreased value of the products and services, of...
Performance of Closed Type Impeller Designed for Easy Manufacturability
Mária Čarnogurská, Peter Gašparovič
Acta Mechanica Slovaca 2010, 14(1):20-25 | DOI: 10.2478/v10147-011-0003-2
The impeller of the semi-open type from a refrigerator unit is redesigned to improve efficiency and to reduce the pressure pulsations of the front case. Therefore, the closed-type impeller with outer shroud is chosen. Dimensions are scaled according to Cordier diagram with rotational speed preserved. The resulting geometry is constrained by requirement of easy manufacturability by injection moulding process. These constrains don't permit to improve efficiency by redesigning impeller.
Variability of Gait Parameters in Different Daily Situations
Dušan Šimšík, Alena Galajdová, Zlatica Dolná
Acta Mechanica Slovaca 2010, 14(1):26-35 | DOI: 10.2478/v10147-011-0004-1
Gait parameters of ten subjects were recorded in Human Motion Analysis Laboratory at Technical University of Košice to provide data for gait pattern study. Subjects were walking by their self-selected walking speed and accelerated speed of walking in 3 different situations differing with type of cloths. System SMART was used to capture 3D coordinates of subjects' movement (6 infrared cameras, 50Hz) for each specific situation and different speed. The motion data available immediately after 3D gait data reconstruction in SMART Tracker software were time dependent position, velocity and acceleration of 25 markers. They provided input for further calculation...
Demonstration of the Matsol Library Developed for the Efficient Solution of Contact Problems and its Comparison with Ansys
Petr Horyl, Tomáš Kozubek, Alexandros Markopoulos, Tomáš Brzobohatý
Acta Mechanica Slovaca 2010, 14(1):36-41 | DOI: 10.2478/v10147-011-0005-0
The goal of this contribution is to present the MatSol library developed for the efficient solution of large problems in contact mechanics. The MatSol solvers are based on FETI domain decomposition methods which are well known by their parallel and numerical scalability. The performance is illustrated on a model contact problem of the cantilever cube over the obstacle. Finally, we compare the MatSol solution with the ANSYS one of a simplified contact problem with Coulomb friction of the yielding clamp connection.
Integration of Product Innovation Techniques in Automotive Component Design
Milan Kováč, Štefan Babjak
Acta Mechanica Slovaca 2010, 14(1):42-53 | DOI: 10.2478/v10147-011-0006-z
The automotive sector has been under the uncommon depression since 2008 due the global economic crisis. The companies will need in forthcoming time to reevaluate their strategies and adapt to oncoming changes. Experts correspond in opinion that the way out of crisis leads through innovation. The best way to eliminate the losses that don't add value within the process of product design and development is to apply the "lean thinking" philosophy. For innovation process in the field of automotive components is integrated portfolio of innovation methods and techniques an excellent way to gain the benefits of lean approach.
Adaptive Control of Non-linear System Using Neural Network
Ivan Taufer, Oldřich Drábek
Acta Mechanica Slovaca 2010, 14(1):54-63 | DOI: 10.2478/v10147-011-0007-y
The paper deals with one of possible methods for control of non-linear dynamical system, namely with the adaptive neural PS controller (ANPSC). Its principle is in on-line refinement of the model system and then in the adaptive adjustment of the controller parameters. The model of the plant is realized with a two-layer feedforward neural network. The control part of the ANPSC has the structure of the classical PS controller, and it is also created in the form of the neural network (simple perceptron). The simulation calculations were performed in MATLAB.
Active Vibration Control of Aluminium Flexible Structure Using Optimal Controller
Mouleeswaran Senthil kumar
Acta Mechanica Slovaca 2010, 14(1):64-71 | DOI: 10.2478/v10147-011-0008-x
Vibrations of aluminium flexible structure are actively controlled by using piezoelectric actuators. In active vibration control the control device has varying properties for controlling vibrations. In this active control system, the vibrations are sensed by the sensors which are placed at free end of the beam and these sensed signals are given as input to the control system. In turn, out put in the form of voltage is given to the piezoelectric actuator to control the vibrations by an optimal controller. Thus vibrations are controlled actively. In this paper, an optimal controller called Linear Quadratic Regulator has been designed involving minimization...
Environmental Compatibility of Mechanical Engineering Products (MEP-s)
Juraj Muránsky, Miroslav Badida
Acta Mechanica Slovaca 2010, 14(1):72-75 | DOI: 10.2478/v10147-011-0009-9
The basic principle of eco-design is that as the various stages of MEP development proceed, technical choices become increasingly limited and the possibilities of reducing environmental impacts are correspondingly limited. Consequently the environment must be factored in as early on as possible in the process. One of the essential characteristics of eco-design is that by adopting such an approach and adding the tools of eco-design to their conventional design tools, designer's work can have extremely positive effects on the environment. The results achieved - environmental compatible MEP-s. An example from automotive industry.
Analysis of Economical Efficiency of Low-Temperature Heating Utilization and HW Supply in Combination with Solar Collectors in Housing and Municipal Sphere
Peter Horbaj, Natália Jasminská
Acta Mechanica Slovaca 2010, 14(1):76-79 | DOI: 10.2478/v10147-011-0010-3
Economical system application of heat supply with using solar collectors in combination with heat pump is not only a question of return of investment. It is also the question of priorities, life style and ecology.Many methods, studies and tables with presented data about energy consumptions for various ways of heating to determinate return of investment.Basic condition of economical advantageousness of heat pump utilization instead of classic way of heat production in term of total year costs is that those are lower than total year costs for comparative classic way of heat production. Because difference in investment costs of comparative heating...
Experimental Evaluation of Corrosion and Hardness on AISI 316l Stainless Steel Implanted with Nitrogen and Argon Ions
V. Muthukumaran, V. Selladurai, A.R. Reghuraj, M. Senthilkumar
Acta Mechanica Slovaca 2010, 14(1):80-87 | DOI: 10.2478/v10147-011-0011-2
In this work the AISI 316L SS was implanted with two different ions namely nitrogen and argon separately at 100 KeV with fluence of 1×1017ions/cm2 at room temperature. The crystallographic orientation and surface morphology were studied using X-ray Diffraction (XRD) and Scanning Electron Microscope (SEM). The effects of ion implantation, on the corrosion performance of AISI316L stainless steel were evaluated. Microhardness was also measured by Vickers method by varying the loads. The results of the studies indicated that there was a significant improvement in both corrosion and hardness in the case of implanted samples.
Equipment for 3-D Picturing and Measurement of Atherosclerotic Plaque
Radim Farana, Lačezar Ličev, Jaromír Škuta, Štěpán Sojka, Michal Bar, David Školoudík, Pavel Hradílek
Acta Mechanica Slovaca 2010, 14(1):88-93 | DOI: 10.2478/v10147-011-0012-1
This contribution presents a management system with the achieved results of a complex grant project focused on the development of equipment for the 3-D picturing of a carotid artery. This problem was solved during years 2006 - 2008 by specialists from the Faculty of Mechanical Engineering VŠB-TUO, Faculty of Electrical Engineering and Computer Science VŠB-TUO and Neurological Clinic FN Ostrava during the solving of research project GA 101/06/0491 supported by the Czech Science Foundation. The main goal is mechanical system for the exact measurement of Atherosclerotic Plaque (AC plaque) in a carotid artery, including the control system and synchronizations...
Emission of Dioxins in Biomass Using Furnaces
István Patkó, Zoltán Juvancz, Mária Túri, Ervin Lumnitzer, Darina Badidová, Beata Hricová
Acta Mechanica Slovaca 2010, 14(1):94-99 | DOI: 10.2478/v10147-011-0013-0