Acta Mechanica Slovaca, 2013 (vol. 17), issue 4
Distinguished State Award Received by Dr.h.c. mult. prof. Ing. František Trebuňa, CSc.Editorial, Editorial article
František Trebuňa
Acta Mechanica Slovaca 2013, 17(4):4
The Study of Residual Stresses in the Surface Layer
Piotr Kuryło
Acta Mechanica Slovaca 2013, 17(4):6-15 | DOI: 10.21496/ams.2013.040 
This essay synthetically presents a selection of technological properties of EN-GJS-500-7 Spheroidal cast iron castings and a selection of applications of spheroidal cast iron in the function of its chemical composition. The concept of the surface layer (SL) was defined, its classification and basic elements of its structure were provided. The essay presents the results of the Davidenkov's method research on internal stresses in the surface layer of the cast iron castings (in weld surfaced half products appropriated for preforms and glass moulds). The results of the research clearly show that the values of stresses occurring during weld surfacing depend...
Optical Line Recognition Sensors for Line Follower
František Šimčák, Michal Kelemen, Ivan Virgala, Ľubica Miková
Acta Mechanica Slovaca 2013, 17(4):16-21 | DOI: 10.21496/ams.2013.041
Paper deals with optical line recognition sensors, which are useful for line follower robots. Line follower is the category of robotic contests. The basic idea is to locomote with robot and follows the black line on white surface. Robot design is very frequently based on two wheeled differentially driven undercarriage with third supporting support wheel. The locomotion of the robot is controlled via using of microcontroller on the base of information from line recognition sensors. Selection of these sensors has a big role in robot design for this category of robot contest.
Control Theory and Deep Brain Stimulation for Relief from Neurological Diseases
Clare M. Davidson, Annraoi M. dePaor, Madeleine M. Lowery
Acta Mechanica Slovaca 2013, 17(4):22-30 | DOI: 10.21496/ams.2013.042
Deep Brain Stimulation (DBS) is a neurosurgical technique in which microelectrodes, embedded in a closely specified target area of the brain, are stimulated by a periodic, rectangular, charge-balanced signal, generated by a stimulator embedded in the chest. It was serendipitously discovered by neurosurgeon Professor Alim-Louis Benabid in Grenoble in 1987 that "high frequency" (of the order of 130Hz) stimulation of the Basal Ganglia in the brain could eliminate the characteristic tremor (about 5 to 8 Hz) associated with Parkinson's disease and also release the associated "locking of gait." Since then the idea has been applied to other neurological diseases...
Robotics and Assistive Technology to Improve Function in Neuromuscular Diseases
Tariq Rahman, Joseph Basante, Michael Alexander
Acta Mechanica Slovaca 2013, 17(4):32-39 | DOI: 10.21496/ams.2013.043
Therapeutic techniques for people with movement disorders are described along with technology that can be used to mitigate the symptoms. Disorders that affect movement include muscular dystrophy, spinal muscular atrophy, cerebral palsy and others. The article discusses conventional occupation therapy techniques currently used and robotic and orthotic devices that are seen in a research and clinical setting. First the neuromuscular disease presentation is described. Next the current assistive technology techniques and devices are outlined. Finally, robots and orthoses for the upper and lower extremity are described in terms of effectiveness and cost....
Computed Tomography - its Development, Principle and Image Artifacts
Teodor Tóth, Radovan Hudák
Acta Mechanica Slovaca 2013, 17(4):40-47 | DOI: 10.21496/ams.2013.044
Paper deals with medical and industrial tomography and describes they development, utilization and their basic functions and design principles. During sensing of object (patient) may occur artifacts caused by scanning object (body movement, implants, beam hardening). The paper describe the most frequently artifacts and compare the parameters of medical and industrial CT machines.
Orbital Radii and Rotation of Celestial Bodies
Kamil Madáč, Andrej Madáč
Acta Mechanica Slovaca 2013, 17(4):48-51 | DOI: 10.21496/ams.2013.045
Orbital radii of the planets and moons are considered to be random. The predominant view says that planets and moons can orbit at any radius, similarly to satellites which can be placed at various orbits if only their orbital speed is correct one. Defining of orbital radii of the Sun's planets on their physical nature basis is unknown. The article aims to contribute to the knowledge and reasons of celestial bodies' orbital radii and about the reason of their rotation.
Design of a Carding Machine Modern Main Cylinder
Piotr Danielczyk, Jacek Stadnicki
Acta Mechanica Slovaca 2013, 17(4):52-57 | DOI: 10.21496/ams.2013.046
The following paper presents the design of a modern main cylinder in the carding machine with a special bottom with a conical ring. In order to find the optimum dimensions of the cylinder, considering the criterion of minimal deflection, parametric FEM model of the cylinder developed in the ANSYS package has been used. Polak-Ribery conjugate gradient method has been applied for searching the optimal solution. As a result of the performed analyses, reduction of maximum deflection value at approximately 80% has been obtained. Optimal cylinder dimensions enable application of a new textile technology - microfibre carding and improvement in the quality...
Design and References of the Staged Air High Momentum Burner
Peter Horbaj, Peter Lukáč
Acta Mechanica Slovaca 2013, 17(4):58-62 | DOI: 10.21496/ams.2013.047
The results of experimental investigations of the gas fired two-staged burner of air high momentum are presented in this paper. It was carried out in order to study the operating parameters and the effects of the change of excess air as well as the addition of water into the pre-heated combustion air stream on the NOx emission.
New Method of Residual Stress Evaluation and its Advantages in Comparison with More Common Hole-drilling Method
František Menda, František Trebuňa, Patrik Šarga
Acta Mechanica Slovaca 2013, 17(4):64-70 | DOI: 10.21496/ams.2013.048
Residual stress evaluation in constructions and mechanical parts is a necessary task in every modern industrial factory. Right evaluated changes in lifetime and loading conditions could save amount of money and increase the human safety. The Department of Applied Mechanics and Mechatronics has a long tradition in developing and practical usage of semi-destructive methods for determining residual stresses. Especially by using hole-drilling method and recently also Ring-Core method. Main characteristics and comparison of both methods with emphasis on Ring-Core analysis are discussed in this article.
Simulation of Control in Elderly Household Environment
Daniel Siman, Stanislav Krajňák, Ondrej Biroš, Dušan Šimšík
Acta Mechanica Slovaca 2013, 17(4):72-76 | DOI: 10.21496/ams.2013.049
Article deals with SCADA visualization software PROMOTIC as tool for simulation for controlling seniors household. This article presents sensor network proposal according to specific requirements. The basic protocols in sensor network are 1-wire and zigbee protocol. We describe basic blocks in PROMOTIC and its usage in our application. Control algorithms are written in script language VBScript.
Substantiation of a Physical Model of Electromagnetic Field Interaction with a Food Product of an Arbitrary Form
Potapov V.O., Mykhailov V.M., Mykhailova S.V., Borisova A.O.
Acta Mechanica Slovaca 2013, 17(4):78-83 | DOI: 10.21496/ams.2013.050
Physical model of electromagnetic field interaction with a food product of an arbitrary form placed into a cavity super-high frequency chamber is substantiated. Physically correct equations for engineering analysis of electromagnetic field strength and density of the internal heat sources during microwave treatment of food products of an arbitrary form are received.
Reducing of the Acquisition Costs for Products
Jozef Mihok
Acta Mechanica Slovaca 2013, 17(4):84-88 | DOI: 10.21496/ams.2013.051
The acquisition costs are the total costs for a firm to buy an assets. The acquisition cost includes all legal fees, closing costs, or other increases. Presented article is aimed at parametrical description of acquisition costs mainly in logistics.
Theory of Services in MRP and Logistics
Jozef Mihok, Jaromír Markovič
Acta Mechanica Slovaca 2013, 17(4):90-95 | DOI: 10.21496/ams.2013.052
Knowledge about the orientation of body segments is a vital source of information. It can be Presented article is oriented on theory of services. Theory of services means knowledge of what is permanent and normal in producing a service. Traditionally, this knowledge has been accumulated in tacit form in the professional skill of the people involved in the activity.