a review - Acta Technica Corviniensis

ACTA TECHNICA CORVINIENSIS – Bulletin of Engineering
to a real gear unit. 3D-CAD systems are often equipped with modules for analyzing geometrical parameters and
cooperation of individual parts of the unit for example the area of contact. A detailed analysis of cooperation of gear
parts of the unit allows for detecting models’ faults early and for deleting them. After making 3D-CAD models one can
approach to creating a prototype by means of Rapid Prototyping methods. It is necessary to prepare the numerical data
essential as a subsequent stage of the process of making the demonstrator. On that basis the individual parts of the
gear unit are made in an incremental process. The accuracy of creating a physical prototype depends mainly on the
accuracy of a 3D-CAD/3D-RP model prepared in a process of processing numerical data. A demonstrator described in the
paper has been made by means of FDM method. The prototype allowed for analyzing constructional solutions of gear
units on a physical model and for preparing assumptions for introductory stand tests. In case of measurement of gear
wheels using modern technologies based on numerical machines, measurement process is based on processing of
numerical data obtained by measurement using coordinate measuring machines. In this paper is present the opportunity
to automate the measurement process of gears, using coordinated optical CMM Baty Venture machine.
12. A.G. VIJAYA KUMAR, Y. RAJASEKHARA GOUD, S.V.K. VARMA, K. RAGHUNATH – INDIA
THERMAL DIFFUSION AND RADIATION EFFECTS ON UNSTEADY MHD FLOW THROUGH POROUS
MEDIUM WITH VARIABLE TEMPERATURE AND MASS DIFFUSION IN THE PRESENCE OF HEAT
SOURCE/SINK 79
Abstract: The objective of the present study is to investigate thermal diffusion and radiation effects on unsteady MHD
flow past an impulsively started infinite vertical plate with variable temperature and mass diffusion in the presence of
heat source or sink through porous medium. The fluid considered here is a gray, absorbing/ emitting radiation but a
non-scattering medium. At time t>0, the plate is given an impulsive motion with a velocity u=u 0 in the vertical upward
direction against to the gravitational field. And at the same time, the plate temperature and concentration levels near
the plate raised linearly with time t. The dimensionless governing equations involved in the present analysis are solved
using the Laplace transform technique. The velocity, temperature, concentration, Skin-friction, the rate or heat
transfer and the rate of mass transfer are studied through graphs and tables in terms of different physical parameters
entering into the problem.
13. Luba BICEJOVA, Martina NOVAKOVA, Juliana LITECKA - SLOVAKIA
MODIFICATIONS OF THE WATER JET SPLITTING 87
Abstract: Water jet cutting technology represents a high-performance cutting and shape dividing of all materials. The
factors that influence the properties of machined surface can be summarized as factors of liquid hydrodynamic
properties, technical factors influencing hydro-erosive process and technological factors influencing hydro-erosive
surface of the cutting. Technology of the water jet cutting present progressive approach with unique possibilities that
enables shape cutting and dividing of various hard-to-process materials without producing the heat-affected zone of
cutting edge within the workpiece. The paper is focused on practical aspects of the AWJ technology setup alternatives;
particularly on those which are connected with splitting of the high pressure jet.
14. Fazdliel Aswad IBRAHIM, Mohd Wira Mohd SHAFIEI,
Abdelnaser OMRAN, Ilias SAID – MALAYSIA
RATING SYSTEMS IN HOUSING DESIGN AND DEVELOPMENT 91
Abstract: Green or sustainable design approach in all industries and sectors has become a demand of the global world.
The negative impacts of the industries such climate change; global warming, ozone depletion and inefficient resource
consumption have received a great concern and awareness among the public, politicians and academicians. Thus, a lot
of efforts have been implemented either in terms of theories or practices in order to reduce the negative impacts of
the industries. In the building sector, the sustainable building rating systems (SBRS) and certification systems has been
designed and adopted in the building sector which intended to foster more sustainable building design, construction and
operations by promoting and making possible a better integration of environmental concerns with cost and other
traditional decision criteria. However, most of the internationally devised rating systems and certification system have
been tailored to suit the building sector of the country where they were developed. Despite the different rating system
adopted for the building sector in different country, these rating systems shared the common elements. Therefore, the
aim of this paper is to explore the elements used in SBRS and the classification of certification system. This paper will
start with the historic of sustainable development and green design, subsequently followed with the discussion on the
SBRS adopted which focused only for Asian region and lastly, discussion on the unique elements of SBRS.
15. Ala’a M. DARWISH, Wameedh G. ABDUL-HUSSEIN, Zeena T. JALEEL – IRAQ
ELIMINATING HALF OF THE CONSTRUCTIONAL DEFLECTIONS OF SIMPLY SUPPORTED STEEL
BRIDGES BY USING TEMPORARY CONTINUITY 97
Abstract: When it is required to cast a bridge over a valley, a river or a busy highway, it is difficult to use the required
shoring for the concrete casting molds. In such cases, the heavy weight of fresh concrete will be directly subjected to
the bridge girders. This situation will apply severe stresses to the bare supporting - normally long span - girders, leading
to an un-favorite and uncorrectable permanent deflection. In this research, a simple test was done to simulate the
mentioned critical case. It was found that; by constructing temporary joints for both ends of the steel girders of a
simply supported bridge panel with its adjacent panels will apply reversal moments to the original panel. By reducing
mid span moments due to the weight of fresh concrete of the deck slab during construction, a noticeable reduction–up
to Fifty percent–of the expected mid span constructional deflection can be eliminated.
16. Fathollah OMMI, Ehsan MOVAHEDNEJAD, Kouros NEKOFAR - IRAN
COMPARING PERFORMANCE CHARACTERISTICS OF A GASOLINE AND CNG ENGINES AND
INCREASING VOLUME EFFICIENCY AND POWER USING DESIGNED TURBOCHARGER 101
Abstract: In recent years, the utilization of cleaner alternative fuels such as natural gas, methanol reformed gas
(MRG), and hydrogen, is much more common, as a solution for environmental problems including global warming effect
and for the shortage of crude oil reserve in the world. Power reduction is one of the important problems of converting
gasoline engine to CNG and using the turbocharger can be a solution for increasing the engine power. In this paper, a
model of a 4–cylinder multi-point fuel injection engine was prepared using a one dimensional fluid dynamics code for
2013. Fascicule 2 [April–June] 17