Acta Mechanica Slovaca, 2015 (vol. 19), issue 1
The New Student Project of Our Faculty - Small Electric Car for the Future on the Platform of VW e-upEditorial, Editorial article
Milan Kováč
Acta Mechanica Slovaca 2015, 19(1):4
Analysis of Inlet and Outlet System of Racing Engine and Influence of Various Configurations on Brake Mean Effective Pressure
Michal Puškár, Melichar Kopas
Acta Mechanica Slovaca 2015, 19(1):6-17 | DOI: 10.21496/ams.2015.001 
This article is focused on experimental analysis of acoustic wave influences on the brake mean effective pressure. An experimental base was created using a racing motorbike driven by piston combustion engine, which is equipped with a developed inlet pipe. The inlet air pressure value changed from the atmospheric level to the under-pressure level. This change is connected directly with increasing of the power output and torque. The tuned racing outlet system was applied for measuring of the outlet pipe characteristics. There were investigated influences of the individual configurations in the case of both analysed systems by means of the sequential...
Behaviors of Simply Supported Cross-Ply Rectangular Symmetric Laminates Plates with Consideration of Prebuckling In-Plane Deformation
Abdelaziz Lairedj, Mokhtar Bouazza, Khaled Amara, Abdelmadjid Chabani
Acta Mechanica Slovaca 2015, 19(1):18-27 | DOI: 10.21496/ams.2015.002
This paper addresses the elastic buckling of simply supported cross-ply rectangular symmetric laminates with allowance for the effects of prebuckling in-plane deformation and higher-order strain terms (curvature terms), using the first order shear deformation theory. The governing plate equations are derived by considering the stationary condition for the derived energy functional by applying the calculus of variations. The buckling load of symmetric cross-ply laminated rectangular plates, which are subjected to uniaxial compression, biaxial compression, and biaxial compression and tension, are determined whilst the effects of different parameters,...
New Method for Image Analyze using Mathematical Method of Graph theory and it's Application in Robot Laser Hardening
Matej Babič
Acta Mechanica Slovaca 2015, 19(1):28-35 | DOI: 10.21496/ams.2015.003
Graphs are structures that have a long history in mathematics and have been applied in almost every scientific and engineering field. Use of graphs has become very influential in computer science and has led to many applications in denoising, enhancement, restoration, and object extraction. Accounting for the wide variety of problems being solved with graphs in image processing and computer vision. We have two goals for this article. Firstly, we make this work self-contained by reviewing the basic concepts and notations for visibility graphs in 3D space that are used process of robot laser hardening. In process of robot laser hardening we have many...
Removal of Ammonium Ions from Gypsum Slurry in the Process of Desulphurisation of Flue Gases
Miroslav Příhoda, Mária Čarnogurská, Roman Pavlov
Acta Mechanica Slovaca 2015, 19(1):36-41 | DOI: 10.21496/ams.2015.004
The article deals with the proposed methodology for the removal of ammonium ions from the gypsum slurry in the Vojany Slovakia (EVO) power plant. The suspension (slurry) is formed as a by-product of the treatment process of the flue gas desulphurization and denitrification, when ammonia water is being fed to the flue gas. Most of the ammonia, which does not participate in the chemical reaction, escapes together with the flue gas into the absorber of the desulfurization device. By washing such flue gases, large quantities of gypsum slurry are created, which contain ammonium ions. Gypsum slurry is admixed to the "stabilizer" in its production, where...
Experimental Identification of Linear Actuator Properties
Michal Kelemen, Ivan Virgala, Ľubica Miková, Peter Frankovský
Acta Mechanica Slovaca 2015, 19(1):42-47 | DOI: 10.21496/ams.2015.005
Paper deal with experimental identification of the electro-mechanical linear actuator properties. Force-velocity dependence and positional accuracy has been identified. Results show the difference between the data declared via producer and experimental obtained data.
Pressure Waveform Modelling in Diesel Engines
Sunny Narayan
Acta Mechanica Slovaca 2015, 19(1):48-51 | DOI: 10.21496/ams.2015.006
In this work combustion noise produced in diesel engines has been investigated. In order to reduce the exhaust emissions various injection parameters need to be studied and optimized. The combustion noise has been investigated by means on in cylinder pressure measurements using piezo electric transducers. The noise has been evaluated for a 440 cc diesel engine mounted on test rig. The engine was run under various operating conditions varying various injection parameters.
Optimization of a Motorcycle Rear Suspension Mechanism with Four-bar Linkage
Štefan Segľa, Ovidiu Antonescu, Martin Orečný, Abdel Elbaghar
Acta Mechanica Slovaca 2015, 19(1):52-59 | DOI: 10.21496/ams.2015.007
In the paper optimization of the motorcycle rear suspension mechanism is presented. The introduction of a four-bar linkage in the classic rear suspension system, composed of a large fork made up of two trailing arms with two spring damper units, one on each side, inclined at a certain angle with respect to the swinging arm, makes it easier to obtain the desired damping and stiffness characteristics of the suspension system. The geometric parameters of the four-bar linkage (Uni-Trak® design of Kawasaki) are used in the paper as the design variables, which are optimized to obtain desired damping characteristics of the rear suspension system. It enables...
On the Total Edge Irregularity Strength of Disjoint Union of Graphs
Martin Bača, Joe Ryan, Andrea Semaničová-Feňovčíková
Acta Mechanica Slovaca 2015, 19(1):60-65 | DOI: 10.21496/ams.2015.008
For a simple graph G=(V(G),E(G)), a total labeling f: V(G)υE(G) → {1,2,...,k} is called k-labeling. The weight of an edge xy in G, denoted by wtf(xy), is the sum of the edge label itself and the labels of end vertices x and y, i.e. wtf(xy)=f(x)+f(xy)+f(y). A total k-labeling is defined to be an edge irregular total k-labeling of the graph G if for every two different edges xy and x'y' there is wtf(xy)≠wtf(x'y'). The minimum k for which the graph G has an edge irregular total k-labeling is called the total...