Acta Mechanica Slovaca, 2013 (vol. 17), issue 1
Questions of Material Transport and Handling are Inspirational for Education and PracticeEditorial, Editorial article
Peter Bigoš
Acta Mechanica Slovaca 2013, 17(1):4
Active Data Maps of Control Unit for Racing Motorcycle
Peter Bigoš, Roman Tonhajzer, Michal Puškár, Melichar Kopas
Acta Mechanica Slovaca 2013, 17(1):6-10 | DOI: 10.21496/ams.2013.001 
The current engine management of the four-stroke piston combustion engine require a continual distribution of the operational information. From this reason it is necessary to control the correctness of these data all the time. In order to realise this control process it should be applied the special software, which enables reading of the data fields and in this way it contributes to a faster and more correct distribution of the active measured values.
The Evaluation of Mechanical Properties of Degraded Pet Bottles
Zdenka Džoganová, Badida Miroslav
Acta Mechanica Slovaca 2013, 17(1):12-16 | DOI: 10.21496/ams.2013.002
In this article is attention focused on mechanical properties of selected PET material, which test samples were made from PET bottles. Notice that is already used packaging material. Test samples were stored in environment degradation with higher temperature with the aim to simulate the term conditions in summer. The test samples were gradually picked from environment degradation in exactly specified time cycles. After that there was done the tensile test to determine mechanical properties of these test samples - yield strength, tensile strength and relative extension.
Experimental and Calculation Determination of Crane Rail Fatigue Life
Peter Bigoš, Eva Faltinová
Acta Mechanica Slovaca 2013, 17(1):18-22 | DOI: 10.21496/ams.2013.003
This paper presents the assessment of crane rail load-bearing structure by tensometry in a metallurgical plant under hard working conditions and it assigns the remaining fatigue life of load-bearing structures, moreover it makes a proposal on its further performance.
The Analysis of Indoor Environment Parameters in Office Buildings
Stanisław Gil, Maciej Rozpondek, Tomasz Grychowski
Acta Mechanica Slovaca 2013, 17(1):24-31 | DOI: 10.21496/ams.2013.004
The current tendencies concerning optimisation of maintenance parameters with regard to thermal comfort and indoor air quality in office and commercial buildings have been presented. The heating, ventilating and cooling systems for the indoor environment design have been characterized. Results of investigations regarding the indoor environment parameters for selected, representative buildings - a traditional, modernized building and an energy-efficient building - have been compared. In the energy-efficient building, a high diversity of indoor air quality (IAQ) has been demonstrated. Effective ways of indoor environment parameter optimisation in the...
Vibration Analysis of a Centrally Clamped Disk
Peter Hudák, Ján Ondrejčák, Tomáš Harčarík
Acta Mechanica Slovaca 2013, 17(1):32-36 | DOI: 10.21496/ams.2013.005
This is the abstract section. In the study of modal analysis is it very important to understand the vibrational behavior of parts in order to reduce their contribution to radiated noise. Predicting vibration using today's simulation methods is still restricted by limited knowledge of boundary conditions and material parameters. Using an experimental modal analysis, modal parameters such as mode shapes, natural frequencies, modal damping can be measured. This measured data can be used as input data for numerical simulation. With correlation analysis, the results from finite element analysis (FEA) and experimental modal analysis (EMA) can be compared.
Automation of Isolated Diagnosis Faults by Coupling Vibration Analysis- Artificial neural networks.
N. Menasri, A. Bouchoucha, D. Khoja, M. Zaoui
Acta Mechanica Slovaca 2013, 17(1):38-45 | DOI: 10.21496/ams.2013.006
Rotating machines play a strategic role in a manufacturing process; it is the case of a cement mill. These machines are made of fragile organs (bearings and gears, etc.) subjected to significant mechanical stresses and harsh industrial environments. Improving productivity through better control of the production tool through its automation, although by controlling its availability; automation must be associated with a maintenance strategy that will ensure a more availability. However, many techniques available currently require much expertise to successfully implement; it requires new techniques that allow relatively unskilled operators to make reliable...
Experimental Verification of Abrasive Mass Flow Impact on the Technological Head Acceleration Amplitude and Vibrations Frequency in the Production System With AWJ Technology
Štefánia Salokyová, Stanislav Fabian, Tomáš Olejár
Acta Mechanica Slovaca 2013, 17(1):46-50 | DOI: 10.21496/ams.2013.007
Between the technological parameters that influence the acceleration amplitude and vibrations frequency on technological head in the production system (PS) with water jet technology belongs the abrasive mass flow. The article is focused on examination of the ukrainian garnet abrasive mass flow on technological head vibrations and their frequency spectrums during cutting material HARDOX 500. The article includes description of experiment and measurement results carried out in laboratory workplace with water jet technology.
3D Bioprinters - Future of Implants Biofabrication
Radovan Hudák, Jozef Živčák, Martin Šarik, Robert Dadej, Richard Raši
Acta Mechanica Slovaca 2013, 17(1):52-59 | DOI: 10.21496/ams.2013.008
In a last decade has additive manufacturing passed a long way, where was reached an impressive advance in rapid prototyping technology of fabrication. From plastic and ceramic materials through metals to at the moment most interesting technology of bioprint, where the material which is used for building, directly consist of human tissues. Organ printing, which is based on computer-aided 3D tissue engineering, offers the wide range for research and development in this area. This article summarizes the present advance in this new and not entirely explored field of bio-additive manufacturing. With the help of this technology can be produced the real 3D...
Impulse Response Analysis in a Low Voltage Circuit Breaker using Mathematical Modelling
Senthil Kumar Mouleeswaran, Suryanarayanan Murali, M. Bagyalakshmi, V. Pradeep Kumar
Acta Mechanica Slovaca 2013, 17(1):60-67 | DOI: 10.21496/ams.2013.009
Circuit breakers are of inevitable use in this modern era of electronic and electrical boom. In this paper, the problem of "Nuisance tripping" caused due to environmental impact forces in circuit breakers is analyzed. Formerly, impact response of a circuit breaker latching system was analyzed only using through practical experimentation which proves to be very costly, given the cost of sophisticated equipment used for the testing and the associated employees' over head costs along with other indirect costs. In this research paper, a theoretical model was developed to determine the impact response of a circuit breaker system under the application of...
Stress Analysis and Study the Fracture Mechanics in Planetary Gear Set Using FEM
Hozhabr Mozafari, Sarah Najafian
Acta Mechanica Slovaca 2013, 17(1):68-74 | DOI: 10.21496/ams.2013.010
Automotive and aerospace industries are relevant to use planetary gear sets headed for their incomparable features. Planetary gears flexibility in achieving different speed ratio and high-power-density design makes them often suitable to counter-shaft gear reduction systems. The main components are sun, ring and planet gears. Planet gears are engaged with sun and ring gears and subjected to the severe contact stresses. Consequently, gear tooth crack failure may occur when the critical values are reached. Hence assessment of strength due to contact stresses and failure phenomena is vital to avoid catastrophic damage to the system. Basic types of gear...
Dealing with Insulation in a House
Naje Mohamed Abdulla, Ervin Lumnitzer
Acta Mechanica Slovaca 2013, 17(1):76-77 | DOI: 10.21496/ams.2013.011
This paper focuses on the optimal ways of insulation of a house. It also discusses places in a house that should be or should not be insulated in order to gain maximum energy effiency and to avoid problems with humidity, moisture accumulation and the like that can be caused if the insulation is installed in a wrong or improper way. It also mentions payback equation that could help assess if the investment in the insulation managed to save energy and money for the resident or not and to what extent it managed to do so.
Recommendations and Thermal Insulation for Desert Countries
Naje Mohamed Abdulla, Ervin Lumnitzer
Acta Mechanica Slovaca 2013, 17(1):80-82 | DOI: 10.21496/ams.2013.012
This paper focuses on the analysis of the weather conditions during the day and at night in the dessert areas in Libya, the way they influence the inhabitants' thermal comfort, the causes of their impact on the constructions of the houses, and possible thermal-insulation methods that could be employed in order to prevent extremely hot air from infiltrating into the rooms, that are constantly air-conditioned, and increase the inside room temperatures, as well as try to describe and choose suitable thermal-insulation materials in order to decrease the air-conditioning devices needs which will help decrease electricity costs for air-conditioning devices...
A Finite Capacity of Production Planning Approach for Industrial Manufacturing
Aboubaker Altiaieb Moussttfa, Dušan Malinžák
Acta Mechanica Slovaca 2013, 17(1):84-88 | DOI: 10.21496/ams.2013.013
This paper discusses a production planning approach that takes the finite capacity of the manufacturing system into account. The approach is based on a reduced level of detail modeling of the process flows. The paper considers explicitly only bottleneck steps. A mixed integer programming (MIP) formulation is suggested to determine completion time targets for the bottleneck steps of the lots. A Lagrange relaxation technique is applied to solve the MIP approximately. Intermediate capacity management is related to rough-cut capacity planning, linked to the master schedule, and capacity requirements planning, and linked to the material requirements plan.