Analele Universităţii
"Eftimie Murgu"
Reşiţa
Fascicula de Inginerie
ISSN-L 1453-7397
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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License.

 

Analele Universitatii "Eftimie Murgu" Resita. Fascicula de Inginerie

Vol. 25, No. 1 (2018)


COVER

TABLE OF CONTENT

ARTICLES


How to Deal with Multi-sequential Decision-making Processes

Olga-Ioana Amariei, Codruta-Oana Hamat

In this article, we started from a case study in which we wanted to develop a proprietary design methodology of lower rank production systems, using several softwares. Due to its complexity, the study is truncated, making it the subject of some specialized articles. In this article the placement of a minimal number of machines is achieved, on which the technological flow can be achieved unidirectionally, by applying a new method - AOI method.

Pages: 9-16

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The Mechanism for Actuating and Automating the Shaking Tables

Vasile Iancu

In the paper, is present the shaking table designed for the laboratory use, to simulate the earthquakes behaviors. Wi th this equipment we can study the dynamic behavior of civil engineering structures subjected to seismic motion. The vibratory movement of the shaking table is carried out by means of an electric motor which, through a crank mechanism, moves the shaking table. The smooth start of the shaking table and its movement is accomplished through a frequency converter, FRENIC-Mini series of general use, made by Fuji Electric C. Ltd. Tests was performed using a NI application with a laser displacement sensor, in order to find out the displacement precision.

Pages: 17-23

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Effects of Soret and Dusty Fluid on MHD Flow Past over Inclined Porous Plate

Gaurav Kumar

This paper deals with the effects of Soret and dusty fluid on unsteady MHD flow past over porous plate. The flow is along over inclined plate with constant wall temperature and mass diffusion. The external uniform magnetic field is applied perpendicular to the inclined surface. The surface of plate is considered to be porous and fluid taken is a viscous, incompressible, an electrically conducting. The MHD flow model is consisting equations of momentum, diffusion equation and energy equation. The governing MHD flow model of partial differential equations is transformed to dimensionless equations by using dimensionless variables. To examined the solution of the MHD flow model, useful sets of the values of the parameters have been considered. The governing equations involved analytically. The results obtained have been examined with the help of graphs drawn for various parameters.

Pages: 24-34

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Simulation of a Pneumatically Driven Robotic Gripper Used for Handling Cylindrical Workpieces

Calin-Octavian Miclosina, Mariana-Aliteia Gogoneata, Zoltan-Iosif Korka, Vasile Cojocaru

The paper presents the geometrical model of a robotic gripper with 3 fingers, accomplished by using SolidWorks software, used for grasping cylindrical workpieces of the same length, but with different diameters. Applying an action force to the grippers pneumatic cylinder piston, for a certain cylindrical workpiece, the contact forces between the gripper and the workpiece are determined in the SolidWorks Motion module. Also, in the same module, a study by finite element method is accomplished in order to obtain the highest value of von Mises stress that occurs within the grippers finger. This value is compared to the yield strength value of fingers material, for the verification of its structural integrity in operation.

Pages: 35-42

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The Role of Virtual Laboratories in Improving Students Learning Performance

Andrea Amalia Minda, Gilbert-Rainer Gillich

It is known that experiments and hands-on learning are attractive for actual students. Furthermore, visualization permits an in-deep understanding of the learning content with beneficial consequence on the studentsí performances. Consequently, virtual laboratories can aid students in achieving higher performances when studying machine design. In our research, after the students have familiarized with the theoretical aspects, they dispose of Java applets that allow performing supplementary experiments. After performing numerous experiments, which imply modifying the simulation parameters, it is observed that the students thoroughly understand the studied phenomenon.

Pages: 43-51

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Students Perception Regarding the use of Virtual Instruments in Teaching and Learning Process

Andrea Amalia Minda, Nicoleta Gillich, Gilbert-Rainer Gillich

In addition to the use by students of laboratories and hands-on learning, teaching-learning can be improved by using Virtual Instruments. A questionnaire was administered to find the students opinion on the use of virtual laboratories to facilitate the understanding of the phenomena and to eliminate some disadvantages of the real laboratories.

Pages: 52-60

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Consideration of Active Fire Protection and Coating for Commercial Buildings

Md Azree Othuman Mydin

For buildings and other constructions, fire protection is a must. The fear of uncontrolled fires and the desire to avoid their consequences is as ancient as human civilization. This fear has obvious enduring roots: unwanted fire is a destructive force that takes many thousands of human lives and destroys large quantities of asset. The primary objective of fire protection is to limit loss of properties and lives in the event of unexpected fires. Active fire protection is effective and efficient in most situations. However, passive fire protection, which includes the use of fire-proofing materials, provides an on-site fire resistance measure to prolong the longevity of load-bearing structures. Certainly, the nature, causes and scope of such events have changed considerably over millennia but fear and avoidance have remained as a primary human reaction and as an important human objective, respectively, for virtually every society. This paper will discuss on risk posed by fire, the passive fire protection components, conventional protection materials and thermally reactive materials. From the review, it can be concluded that active fire protection is effective and efficient in most situations passive fire protection, which includes the use of fire-proofing materials, provides an on-site fire resistance measure to prolong the longevity of load-bearing structures.

Pages: 61-68

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Dry Sliding Wear behavior of some Cu and Al Alloys

Lidia Nedeloni, Zoltan-Iosif Korka, Marian-Dumitru Nedeloni, Ileana Loredana Conciatu

In this paper, a study concerning the dry sliding wear behavior of three Cu and Al alloys namely CuSn12, CuAl10Fe3 and AlSi12 was made. For this three alloys type, all tests have been performed with a tribometer using the pin-on-disk method (POD) according to the ASTM G99 standard, where the working conditions (applied load, linear speed, motor speed and distance) were the same. As an important parameter, the coefficient of friction (COF) versus time / distance was monitored respective the wear rate coefficient was calculated. The obtained results were compared between them, and the specific images were acquired through a digital microscope and specialized software. In addition, to these tests, the hardness of these alloys was carried out using a Vickers microhardness tester.

Pages: 69-80

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Influence of Dyeing/Drying Booths Operating Parameters on the Painted Products Quality

Arina Negoitescu, Adriana Tokar, Dan Negoitescu

The article proposes an analysis of the dyeing/drying booths (DDB) operating parameters influence on the quality of products and processes that are specific to an economic agent, which has as its object of activities the design and production of integrated systems made of advanced composite materials, metallic materials and sandwich materials with different cores. In order to assess the product conformity, the production flow of products made of resin reinforced with glass fiber was followed and quality control of painted products was performed by final inspection. Final inspection is an essential factor in any scientific system of production organization and management. There have been highlighted measures in order to solve the spray-painted products nonconformities caused by the change of the dyeing/drying booths operating parameters. In this sense, solutions are proposed in order to correct the defects through three main actions.

Pages: 81-90

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Waste Minimization Strategy and Technique: Towards Sustainable Waste Management

Nurhafiza Mohd Noh, Md Azree Othuman Mydin

Generally, sustainable waste management aids construction key players to diminish and making better use of material on their construction project. The waste minimization strategy is not only implemented during the construction stage, but it record and estimates the use materials through whole project delivery process, in order to decrease the amount of waste requiring disposal at landfill and as a consequence, fully mitigate the interrelated cost, strengthen competitive advantage and environmental benefits. The implementation of waste minimizing plan method is an opportunity to increase profit of construction company through identification of valuable waste and invaluable waste to gain profit. Businesses can create value through the return of construction wastes back to recycling and manufacturing processes into new products. Hence this paper will present the waste minimization strategy and technique towards achieving sustainable waste management

Pages: 91-98

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Mechanical Tests of the Dissimilar Welded Samples by Friction

Adrian Valentin Petrica

The paper presents the experimental achievement of heterogeneous joints, with dissimilar materials, as well as the analysis of these joints by mechanical and metallographic tests. After traction testing of the specimens, it was found that breaking occurred each time in the area of the base material, which leads to the conclusion that the strength of the welded joints is above the resistance of the base materials used.

Pages: 99-104

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The Quality Analysis of the Thermal Sprayed Deposited Layers by Electronically Microscopy

Adrian Valentin Petrica

The analysis performed by electronically microscopy lead to obtain the experimental data under tabular form. A linear chemical quantitative analysis over a 228.87 ?m length was made of on a microscopically image at 250x magnification. The number of points where analyze was made of is 512. Due to the higher number of points which were used for marking of these curves, the interpretation is difficult. Therefore, is necessary an additional assessment processing of these curves which can permit the interpretation of the quantitative chemical analysis. Among the processing versions of the curves, the average for a number of values, choose dependent on the follow purpose, lead to some curves which permit the interpretation of the results.

Pages: 105-110

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Making Mosques Physically & Socially Accessible: Lack of Facilities for People with Disabilities

Farah Nuratiqah Rusli, Md Azree Othuman Mydin

Malaysia is a country which is known for the heavy Islamic moral values presented in its culture and traditions. Mosques in Malaysia are well known for their beauty and captivating architecture. There are 5,300 mosques built in Malaysia as of November 2017 and the number is increasing as the years pass, but the accessibility of amenities for the PWDs is still a major problem. The mosque is not just for those without disabilities, therefore it is important to provide accessibility as to give the PwDs an equal opportunity for them to perform congregational prayers together with other devoted Muslims in respect of helping them perform their responsibilities and their social roles. Throughout history, community attitudes and physical obstructions in the built environment have barred PwDs from fully participating in the society. Access to education, employment, housing, recreation, cultural events, and transportation were denied to many people. These days, along with the emergence in the PWDs population, the mission for impartiality and equal rights is carried out aggressively. Currently, major changes in design requirements, both market-driven and legally mandated, are creating a new life system for PWDs and a new path for designers. This paper will present some of the major dilemmas faced by PwDís when they perform prayers at mosque. Most of the mosque lack of accessibility and amenities for PwDs. Besides, PwDs are part of a community that needs to be assisted so that they can worship in comfort with the others. They also have equal rights and opportunities to live like other community members.

Pages: 111-117

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Accessible Built Environment for People of Disabilities at Mosque: Universal Design

Farah Nuratiqah Rusli, Md Azree Othuman Mydin

People with disabilities (PwDs) face challenges which effect on their capability to complete everyday activities such as moving around, communicating and fulfilling social roles and the social participation assumes individuals with disabilities live within their community and interact with others. In the right of person with disability have been evidently specified in Person With Disability Act 2008 which its stated that it is oblige to recognize the interaction with the disable which hinders their full effective participation in society on equal basis with person without disabilities, and also to value theirs involvement to the community and society. This paper will present the component of universal design in the context of mosque and review some of the legislation and standards related to design of facilities for PwDís at mosque. There is a positive development in terms of public awareness on access and facilities for PWDs in Malaysia even though the accurate understanding of universal design theory is still low among Malaysian society. Some people have misunderstood that universal design is exclusively caters the needs of PWDs access and facilities in the built environment.

Pages: 118-125

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A Solution to Reduce Pollutant Emissions by Recovering the Flue Gases Waste Heat

Adriana Tokar, Arina Negoitescu, Dan Negoitescu, Marius Adam

From the point of view of the energy efficiency improvement and environmental protection, the recovery of waste heat from thermal systems is a necessity. The heat recovered through an economizer is a viable solution in order to achieve energy savings. For this reason, the article deals with a solution for recovering a quantity of thermal energy exhausted into the atmosphere through the dyeing/drying booths (DDB) burners stove pipes at an economic agent. The study illustrates the importance of recovering heat from flue gases in order to reduce pollutant emissions.

Pages: 126-131

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Analele Universitatii "Eftimie Murgu" Resita. Fascicula de Inginerie

Vol. 25, No. 2 (2018)


COVER

TABLE OF CONTENT

ARTICLES


Pre-processing of Images as a Source of Additional Information for Image of the Natural Polymer Composites

Cornelia Victoria Anghel Drugarin, Vyacheslav V. Lyashenko, Muncho J. Mbunwe, M. Ayaz Ahmad

Image processing is one of the methods of analyzing and obtaining new information. Image processing methods can be applied to any image. Image processing is used in various fields of research. Among the stages of image processing, the stage of image pre-processing is important. This stage allows increasing the efficiency of the analysis of the original image. We considered the use of pre-processing for the analysis of natural polymer composites image. In this paper, we describe the possibilities of automatic processing of natural polymer composites image.

Pages: 11-16

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Comparative Aspects of the Temporal Characteristics of the Production of Various Plastic Products

Cornelia Victoria Anghel Drugarin, Mohammad Ayaz Ahmad, Vyacheslav V. Lyashenko

Plastic has a special place in the manufacture of various products. Production of plastic products consists of several stages. Each stage has its own time characteristics. Thus, the duration of the production of plastic parts depends on the individual stages. A comparative analysis of the time aspects of the formation of various plastic products showed that the duration of the molding process is affected by the holding time under pressure, the time of pauses.

Pages: 17-24

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Optimizing the Geometry of a LHy-M Hybrid Locomotiveís Chassis by Resistance Calculations

Aurel Bara, Dorian Nedelcu, Corneliu Dica

Starting from the initial geometry of the LDH 1250 CP locomotive chassis, the work aimed to optimize the geometry in the sense of maximum stresses reduction by geometric changes and the reinforcement of the structure. The optimization resulted from the need to transform the LDH 1250 Hydraulic Diesel Locomotive into the LHy-M Hybrid Locomotive, encompassing hybrid technology, powerful automation elements, as well as ergonomic redundant components that can complement and assimilate the extensive features of the old components of the rolling stock.

Pages: 25-34

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Thermal Calculation of the Reduction Gear 2XAB/StCu110So as Part of Hybrid Locomotiveís LHy-M Mechanical Transmission

Aurel Bara, Dorian Nedelcu, Corneliu Dica

The purpose of this work is to present the reduction gearís efficiency, reduction gear that is load part of hybrid locomotiveís mechanical transmission. The purpose of the calculation is to determine the overall efficiency of the reduction gear to determine its operating temperature.

Pages: 35-40

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Exploitation Solution of the Wind Potential in the Danube Gorge

Petru Chioncel

This paper proposes a solution to exploit the wind potential of the Danube cluster by storing it in the Iron Gates I reservoir lake, through pumping the water downstream of the hydroelectric power plant. Storing energy by pumping water, i.e. turning the plant into a pumped storage hydroelectric plant, will chancel the unstable character of wind energy, also achieving peak load coverage under conditions of investment much be-lower to those of building a hydroelectric power plant with accumulation by pumping the Danube.

Pages: 41-46

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Theoretical and Experimental Research on the Reliability of Parts Rehabilitated by Arc Welding

Lenuta Cindea

The paper presents a technical-experimental study encountered in the repairs of the rotor blades to Kaplan turbines due to cavitation wear due to the cyclical stresses of the surfaces in contact. The repair of the Kaplan turbine rotor pallet was performed for the purpose of metal deposits to compensate for wear, to recover parts with cracks, cracks or bursts in the base material in order to reduce major costs associated with the operation and maintenance of the installations and equipment that make part of the production process.

Pages: 47-52

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Static and Fatigue Analysis of the Hydraulic Cylinder and Tensile Device from an Uniaxial Testing System

Vasile Cojocaru, Ovidiu Jitareanu

The paper presents the static analysis and the fatigue behavior analysis of the components of a tensile test equipment (hydraulic cylinder and tensile device), designed for didactic applications. The stress and the displacements that occur in the limit-loading approaches are calculated using static FEM analysis. It is also investigated the possibility of using the hydraulic cylinder and the tensile device in a redesigned equipment used for fatigue tests.

Pages: 53-58

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Computing of the Slot Number within the Induction Machine Approached in Terms of Electromagnetic Forces

Ion Dobrota, Ion Paraschiv

In order to find the final solution the design of electrical machines usually involves different steps. In the starting stages of design procedure, some of the main variables are given data and all the others must be adopted by a proper approach. This paper proposes a method for determining the total slot number within the induction machine by approaching electromagnetic forces that leads to a particular relationship. The final solution is checked by some manufactured induction machine.

Pages: 59-68

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Aspects regarding Influence of Voltage Disturbances upon Reluctance Synchronous Motors Operation

Monica-Adela Enache, Aurel Campeanu, Sorin Enache, Ion Vlad

In this paper there is analyzed, by simulation, the behavior of a reluctance synchronous motor, in case of two dynamic states caused by modifying the supply voltage. The mathematical model used, the Matlab program and the simulations obtained are presented. The paper ends with conclusions resulted by analysis. There is emphasized the fact that the dynamic stability of the motor is determined by the voltage value, as well as by the machine parameters. By simulation it is possible to establish the stability range and the ways of increasing the stability can be identified. The simulations are an absolutely necessary stage in the motor dimensioning stage.

Pages: 69-76

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Power System Health Monitoring Based on Energy Losses using Genetic Algorithm

Andrei Ioanes, Radu Tirnovan

System health assessment becomes ever more important as consumers take for granted the apparent infallible character of power supply and the extremely high costs of prolonged down times. A system that achieves minimum operational disruptions becomes a target for all grid operators. This paper tackles the system heath issue in distribution networks by evaluating overall network losses. Using a genetic algorithm, the system health is evaluated considering key elements within the network operation.

Pages: 77-86

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Assessing the Level of Electromagnetic Pollution through Statistical-probabilistic Methods and Fuzzy Logic

Marius Savu Lolea, Emeric Remus Szabo, Cornelia Victoria Anghel Drugarin, Petre Cret

This paper is dedicated to the analysis of the possibilities of assessing the level of electromagnetic pollution in the public spaces and the lucrative areas on the application of some statistical and probabilistic methods and by fuzzy modeling. The proposed models are applied to several components of the electrical grids located in Oradea or Bihor County.The first part of the paper ishows the statistic-probabilistic methods. There are presented models for calculating the level of electromagnetic pollution based on the probability of exceeding the dangerous threshold values of the characteristic magnitudes of the electromagnetic field. The second part is allocated to assessing the level of electromagnetic pollution by using fuzzy logic. There are elaborated models for fitting the values of electromagnetic field values into the risk levels given by the exposure of the organism in the electromagnetic field. By using the fuzzy toolbox from the Matlab software, the rules of inference for the specific conditions of electromagnetic field exposure and exposure, applied in power plants in Bihor County, are applied.

Pages: 87-98

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Connection of Renewable Energy Sources to the Regional Power Systems. A Short Analyze

Marius Savu Lolea, Emeric Remus Szabo, Cornelia Victoria Anghel Drugarin, Petre Cret

Among the basic problems that are involved in the decision to implement an energy project with Renewable Energy Sources(RES) are the identification of resources and the assessment of their regional potential, the possibilities of connecting to the existing electricity network in the area, the efficiency of conversion of natural RES in electricity, sources of financing and the possibilities of expanding the regional energy system based on RES. Then there are problems of endowing with modern RES-based power plants, the quality of the electricity supplied in the grid, the reliability of the connection schemes and the continuity of the power supply while reducing the energy losses on the grids. All these problems can pose risks to prevent the construction of a RES power plant or the good functioning of RES connected to the regional power system. In the paper, these aspects are analyzed by the authors in accordance with the renewable energy resources and the existing RES on the territory of the Bihor County.

Pages: 99-106

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Quadcopter Stability Increased by PID Adaptive Tuning

Ion-Cornel Mituletu, Elisabeta Spunei, Emanuel Markovican, Ion Popescu

Today World is getting more efficient in mail deliveries or other applications using autonomous vehicles as drones because of their improved performances. The quadcopter appertains to the drone family having the advantage of flying stability light weight and accurate maneuverability. This paper describes the design and the adaptive tuning for dynamic control of a quadcopter using PID control technique. The experimental tests show improved response related to the previous results under the same input conditions.

Pages: 107-112

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X-Y Pen Plotter Design Accomplished from Older Drives

Ion-Cornel Mituletu, Adrian Sirbu, Bogdan Cristian Marinescu

The paper describes the design and the implementation of a small, easily operable and flexible 2-axis CNC pen plotter (Computer Numerical Control). It is accomplished from two old and available CD-ROM (Compact Disc Read-Only Memory) drives using their stepper motors and the main hardware structure. The two stepper motors move the pen platform along X and Y axis. The plotter has been tested for printing different images and texts. Thus, the functional and graphical requirements were demonstrated, the conclusion being that this device is efficient and precise, and it can be easily achieved from available components.

Pages: 113-116

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Digital Control of Centrifugal Air Compressors

Filip Niculescu, Adrian Savescu, Mirela Vasile

The air installation consists of high-capacity centrifugal compressors which pumps in parallel in an industrial pipe. The total air flow rate of the compressors in the pipe can be adjusted by acting on the air suction valve of each compressor so that the shut-off or opening of the compressor valve can regulate the flow rate of each compressor, which results in total flow control. The problem is to replace the analog control of the compressors with a digital control. If we have two types of compressors in the plant, the automatic setting involves closing or opening the suction valve of the compressors in a certain order so that besides the total objective to pump a particular flow we also have high energy efficiency.

Pages: 117-126

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The Importance of Optimal Design in Outdoor Light Source Positioning

Elisabeta Spunei, Ion Piroi, Florina Piroi, Daniel Brebenariu

In this work we underline the importance of the optimal design for outdoor light systems such that light posts and sources are placed correctly. We present a case study where we considered a city road section equipped with LED sources. On this section, we measured technical luminous coefficients, which were then compared with values listed in standard and normative documentation. Based on this we did a new design that had to follow certain requirements on street and lighting post configuration. Comparing the two designs we conclude that, to have an optimal street light system, the engineer must aim for the best possible design and consider this when deciding on the position of the light sources.

Pages: 127-136

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Sigma-demicontractivity and Strong Convergence of Mann Iteration

Irina Maria Terfaloaga, Mihaela Dorica Stroia, Lenuta Cindea

The problem of additional conditions ensuring the strong convergence of Mann iteration for demicontractive mapping is investigated. A critical analysis of ?-demicontractivity condition is performed showing the applicability and how strong this condition is.

Pages: 137-142

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Fuzzy Logic Controllers for High Performance in Secondary Cooling

Gelu Ovidiu Tirian, Cristian Paul Chioncel

The main target of this paper is to develop and implement structures of fuzzy control in the continuous casting process (in the secondary cooling) capable of eliminating the surface flaws and casting rejects, to increase the quality of continuously cast products and implicitly to increase the productivity of the installation by controlling the water flow rate in the secondary cooling circuit. In order to achieve this objective, a solution will be developed and implemented, meant to control the casting process by a fuzzy system, allowing the control of the water flow rate in the secondary cooling, by appropriate distribution along the cooling area. This necessity is imposed by the fact that actual control systems do not correlate in real time the variations of the multiple variables related to the continuous casting process and stick to a rigid distribution of the water flow rate on each cooling area.

Pages: 143-154

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Modeling of Complex Shaped Cracks

Cristian Tufisi, Gilbert-Rainer Gillich

The paper proposes modeling approaches of complex shape cracks. Structures may present many types of defects, of different irregular shapes and sizes, due to various reasons, and so it is very important for the model of the crack used to be accurate. There are three main categories for modeling of cracks; local stiffness reduction, discrete spring models, and complex models in two or three dimensions each proving to be reliable methods for generating finite element models.

Pages: 155-162

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Analysis of the Influence on the Thermal Regime of the Slot Shape within an Induction Machine

Ion Voncila, Ion Paraschiv, Madalin Costin

The paper analyzes the influence of the slots shape pertaining to induction motor armatures on the temperature development within its structure. The analysis of the temperature distribution within the studied motor was made using the Motor-CAD programming environment. The stated aim of the study was to emphasize the importance of choosing the geometrical shape of the slots of a classic rotating electric machine, still in the design phase, in order to obtain the validation - by thermal calculation - at the end of the design, of the geometrical structure that offers the highest technical and economic performance.

Pages: 163-174

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