bluuebunny/crossref_metadata_2025 huggingface dataset:
Design and Realization of Management and Control System in Tobacco Factory Warehouse Based on VC6
Authors: Song Jian Tao , Si Jin Ling , Peng Qiao Jing , Lu Juan , Wang Li Ying
Published: October 2014

The paper proposed the management and monitoring system of automatic tridimensional warehouse based on network communication, the main characters and realization of communication program developing with VC6 are expounded in the paper based on industrial Ethernet communication. the system is divided into the automated warehouse management and control system functional modules. And the communication model between the supervisor computer and the ARM2440 is presented. Experimental results show that the design has lower cost and achieves system integration management and control function.
Design of Wireless Sensor Network System Based on Computer Control Technology
Authors: Xu Qing Hua , Liu Chang Wan
Published: October 2014

In this paper we design a wireless sensor network of Zigbee technology, which consists of sensor nodes, sink nodes and monitoring software design. Through laboratory test, the design of the system is stable and reliable. Although the system can meet the requirements of Zigbee wireless communication hardware, but part of system hardware is relatively simple. If it is applied to the more complex place, we must add the corresponding module in the hardware and software. Adding node function module and the monitoring function in the Zigbee wireless network, it will meet the actual needs.
Research on Recovery of Computer Data Based on Windows System
Authors: Zhou Min
Published: October 2014

This paper researches the computer data recovery in FAT Windows file system, analyzed the storage format and file data operations (such as formatting, partition and delete), specific to the data processing and the data recovery, summarizes the method of data recovery and commonly used software tools, and gives the specific data recovery examples.
Research on Job Scheduling Technology for High Performance Computer Network
Authors: Lin Bo
Published: October 2014

This paper analyzes the advantages and disadvantages of cluster management system of B/S mode, combined with the need of practical application, puts forward the cluster management system structure of Browser/Server/Severs structure with a novel B/S model. This structure can achieve most of the functions of cluster management, and the advanced architecture, solves the problems of cluster management system for two or three layers of C/S structure. From the implementation point of view, this structure can greatly improve development efficiency, reduce development complexity.
Optimization Simulation of Heuristic Algorithm in Supply Chain Based on Least Squares Support Vector Machine
Authors: Zhang Yang You , Zhang Lin
Published: October 2014

This paper uses VB software and accounting information transparency to improve BOT investment mode and establishes computer accounting algorithm using the form of software programming. It also uses the least squares SCF criterion to improve this algorithm and gets the BOT investment accounting information platform after the optimization. The platform mainly focuses on openness of accounting information transparency and account investment efficiency and economic benefit of BOT investment mode using the form of computer array computing. At last, through the calculation, this paper concludes the convergence curve of risk aversion and economic efficiency and analyzes the benefits of BOT investment in risk management and supply chain which provides a theoretical reference for the study of accounting information transparency.
Research on the Automatic Routing Technology in the Logistics System and IOT
Authors: Ouyang Bai Cheng
Published: October 2014

With the rapid development of logistics enterprises, tradition logistics sorting has been unable to meet the needs of the development of express logistics. Combining with the RFID technology, the paper proposes a new way of logistics sorting and data routing. By increasing the RFID tag and the AWB in the express waybill will improve efficiency. Using Cluster head selection principle and clustering algorithm of LEACH (adaptive clustering hierarchy). Comparison with original system, verified the practicability of RFID technology and data routing algorithm in the sorting system and easy to use.
Analysis and Dispose of Deviation of Mine Belt Conveyor
Authors: Zhang Miao , Gao Hong Liang , Zhang Yang , Wang Peng Zhan
Published: October 2014

In order to improve the efficiency of coal production, the security and stability of the coal transportation plays a pivotal role. According to belt conveyor production operation of Huaibei mining area, this paper analyzes in detail the reasons of the deviation of belt and proposes some effective measures.
Weld Seam Automatic Tracking System Based on MCD and Genetic Algorithm
Authors: Dang Xiang Ying
Published: October 2014

In view of the strong arc weld of images, using combined MCD correlation matching method with genetic algorithm of traversing search the real-time image and target the best match position between the template image, build tracking motion model, accurately track the weld seam. Experiments show that the method in background、interference problem and tracking stability has achieved expected effect.
Research of Hoist Supporting Technology Based on Mechanics Analysis
Authors: Zhao Wu
Published: October 2014

The mechanical model is designed through point-by-point method, selection of existing equipment, parts and materials, in accordance with the production line to expand a new elevator manufacturing requirements of the design and the manufacturing cost is saved, completed the system reform. This method after trial production one year practice indicates that the design is reasonable, correct method.
Research on Deep Coal Seam Mining Floor Starta Water Bursting Influenced Factors Based on Analytic Hierachy Process
Authors: Sun Ming , Zheng Wen Xiang , Duan Xiao Bo
Published: October 2014

Deep coal seam mining floor strata water bursting is a complicate nonlinear system, whose factors are coupling and influencing themselves. It built the analytic structure model for deep coal seam mining floor strata water bursting, the judgment matrix was found by the expert scoring method, the contribution weights of the influenced factors were given out by the equation analytic process. The thirteen controlling factors and five main controlling factors were put award by analyzing weights, so the result was basically conform to the field practice. The expert scoring method and analytic process can convert the objective fact to the subjective cognition, so it is a method that can turn the qualitative into the quantitative. This can be relative objectively and precisely to study the question of many factors and grey box.
Research on Reservoir Heterogeneity of Complex Region
Authors: Xie Rui Jie , Ma Yu Liang , Li Zhi Yu , Zhen Huan , Yang Zhi Peng
Published: October 2014

From the context of this area, combined with the well, core and logging data, the characteristics of heterogeneity of this region can be studied. Through calculating the parameters like porosity, permeability, saturation, permeability coefficient of variation, sudden coefficient and differential, the heterogeneity in the layer and the plane has been studied. The sand groups in the Chang 6 reservoir mainly are delta front sand underwater distributary channel sand body, the heterogeneity in the layer is weak; In the plane, the heterogeneity of distributary channel sand body is weak, while the one in estuary dam, front sheet sands and underwater natural levee is strong. Through comprehensive analysis, Chang 6 reservoir in Hulangmao region is strong heterogeneity reservoir. After comparing permeability coefficient of variation, sudden coefficient and differential of 3 layer and 5 layer in Chang 6,it can conclude that the development effect of 5 layer is better than 3 layer in the process of water-flooding development. This research can be some guidance to some area in the mainland.
Study of Fuzzy Mathematics in Diseases Diagnosis
Authors: Guo Hong Bin , Yue Xiao Guang , Chen Xiao Wang
Published: October 2014

In order to diagnose diseases, the basic information of fuzzy mathematics is discussed; and the concept and description of fuzzy mathematics are analyzed in this article. Fuzzy mathematics is introduced in evaluating the ability of enterprise’s innovation, color identification of robots, coal mine safety assessment and other aspects of related example. An application of fuzzy mathematics in disease diagnosis is briefly described. We analyze the basic characteristics of the disease acute gastroenteritis, colds, rhinitis, pneumonia, etc., using the basic theories and methods of fuzzy mathematics to analyze to satisfactory results. The result shows that the method is feasible and effective.
Parameter Estimation and Restoration of Motion Blurred Image
Authors: Song Yu Xiang , Zhang Yan Mei
Published: October 2014

according to the real motion blur image restoration problems, analyze the difference between the image features and Simulation of real blurred images, this paper proposes a method that applied to real image degradation parameter estimation. First calculate the degraded image using cepstrum, taking the cepstrum to binary image using absolute value of minimum gray as the threshold, and then remove the center cross bright line; and then use formula of point to line to calculate the distance of bright fringe direction of binary image, that is direction of motion blur; the direction of motion blur is rotated to the horizontal direction by the degraded image center of rotation axis, divided the autocorrelation method to calculate fuzzy scale. To estimate the point spread function is take into the Wiener filtering algorithm to recover images, image restoration effect prove that parameter estimation results are correct.
Pyroelectric Sensor Integrated Positioning System Design and Implementation
Authors: Tang Wei , Xiong Ji , Li Deng , Zhang J.Y. , Jiang Na
Published: October 2014

With the enhancement of society's concern for public safety, human locate system based on pyroelectric detectors is becoming a research focus. We design a low cost human body tracking system based on pyroelectric detectors scattered in the room. According to a huge number of experiment data, we design a high sensitive pyroelectric infrared node with a very high positioning accuracy. We also build an experiment system to collect muti-node experimental data to achieve the purpose of real time positioning with the positioning accuracy of 0.4 meters, which achieves the purpose of indoor positioning.
Research on the Primary Frequency Regulation of the Large Capacity Thermal Power Units
Authors: Wu Hong Xia
Published: October 2014

Frequency is an important index of power quality, primary frequency regulation is of great significance for maintaining the grid frequency. In recent years, with the expansion of the power grid capacity and the continuous increase of the generator capacity, the large capacity units play a role is becoming more and more important in the primary frequency regulation of power grid. This paper takes ultra supercritical coal-fired units (1000MW) of a power plant of Hubei for example, primary frequency regulation control method, requency offset load curve and so on were studied through relevant test.
Theoretical Study of the Diels-Alder Reaction in the Synthesis of Abietane Diterpenes
Authors: Du Rui Huan , Zheng Bai Qin , Zhang Jian Min
Published: October 2014

Density Functional Theory (DFT),at the B3LYP/6-311 G(d,p) level of theory and Moller-Plesse Theory (MP2/6-311G (d,p)) has been performed to study the mechanism, potential energy surface of the Diels-Alder reaction in the Synthesis of abietane diterpenes. The obtained results indicate that the reaction is concerted and synchronous processes. The transannular product is formed via a six-member ring transition state; yield of the endo product is higher. And finally, the enthalpie and activation energie of the reaction are given respectively. The reaction is exothermic,which accords well with experimental observation.
Development of an Adjustable Measuring System for Electrical Consumptions in Production
Authors: Spreng Simon , Kohl Johannes , Franke Jörg
Published: October 2014

The establishment of green products and a sustainable production increasingly affects corporate competitiveness, as an efficient production does not only affect the energy costs, but also improves the company image. As the importance of renewable energy sources increases, mainly providing unsteady energy levels, load management of manufacturing and assembly lines fades into spotlight. For this purpose, proper measuring equipment is required, being able to log and evaluate varying energy loads.This paper entails an approach being able to automatically measure and process electric load profiles. Hereby, all important hardware components with the belonging requirements as well as the software constitution are described.
Energy Efficiency Investigation on High-Pressure Convection Reflow Soldering in Electronics Production
Authors: Esfandyari Alireza , Syed-Khaja Aarief , Javied Tallal , Franke Jörg
Published: October 2014

One of the key factors in efficient and defect-free electronics manufacturing is the soldering of electronic components to the printed circuit boards. The deciding factor in the reliability and lifetime of the product is the quality of the soldered interconnections. The setting up of the reflow soldering profile plays a crucial role in the electrical functionality and robustness of the product. Especially the miniaturization of the assemblies and the development of new materials make it inevitable for the definition of new processes, optimization and implementation. In this paper, the combination of over-pressure and convection reflow soldering to minimize the defect rate and the related energy analysis for energy efficiency will be discussed and presented. A statistical analysis with variations in solder time, cost, energy, quality trade-off in the over-pressure reflow soldering process for classical printed circuit boards (PCBs) has been demonstrated.
Neutrosophic Modeling of Investment Architectures
Authors: Calefariu Emilia , Boșcoianu Mircea , Smarandache Florentin , Buda Traian Alexandru
Published: October 2014

Despite numerous attempts to refocus traditional bivalent logic, usually, logic is tributary by keeping fixed limits for truth or false. An alternative answer to this need is the system of Neutrosophy, and its connected logic, Neutrosophic Logic, presented in the work of the authors W. B. Vasantha Kandasamy and Florentin Smarandache. Neutrosophy is a new branch of philosophy that studies the origin, nature and scope of neutralities, as well as their interactions with different ideational spectra. We are surrounded by indeterminacy, which can be pointed in any situation that, from one point of view can be considered true, and from another point of view can be considered false. In Neutrosophic logic, every statement includes a percentage of truth (T), includes a percentage of indeterminacy (I) and a percentage of falsity (F). The major novelty of the work is that investment process is analyzed through the method of Neutrosophic logic, taking into account investment parameters such as: economic return on investment, recovery duration on investment, the resources involved (financial, human and time), the production capacity, the period of execution, the work volume, the market demand, the training of the personnel, etc. Thus, this paper consists of the analysis of interdependence and indeterminacy of these parameters. The model will be calibrated by conducting case studies, with real parameters of input to be analyzed and known output data, which will be used for the research of a present investment process.
Conceptual Product Design Inspired from Nature
Authors: Kyratsis Panagiotis , Dimou Eva , Efkolidis Nikolaos , Manavis Athanasios
Published: October 2014

Nature offers a great deal of opportunities for mimicking and inspirations which are already there for long periods and evolve by themselves. A number of scientists from different backgrounds are using it as an inspiration for their designs i.e. material science, algorithms, robotic arms and manufacturing systems. From the conceptual point of view, when designing a product, different approaches can be used, for example similarities in the geometrical form and the functionality. The fact that the inspirations from nature have a number of restrictions due to the lack of common terminology and frameworks platforms for all sciences, can form the main advantage in the area of conceptual product design (CPD). This is true because CPD is more of an art than an actual science and for this reason can transform the main disadvantages of mimicking to a great extent as a serious advantage. Those inspirations in the conceptual level can lead to further opportunities for research and economic success. A number of illustrative case studies are presented in the paper.
Innovation as a Key Factor for Entrepreneurial Activity
Authors: Krolczyk Jolanta , Legutko Stanisław
Published: October 2014

The topic about innovations and success factors in innovations has frequently been discussed by researchers and other writers. ‘Innovation’ is different in science for a researcher and in business for an engineer. In science an innovation is something which is ‘interesting’ and it does not have to be useful, but for engineer an innovation must be something ‘new’ and ‘useful’ and does not have to be interesting. Innovation is as a key factor for entrepreneurial activity which has an influence on the competitiveness of enterprises. In today's increasingly competitive environment, managers are having to update themselves on the range of factors that determine innovation success. The aim of the study was to presents success factors in high-tech companies at start-up stage based on individual surveys and compare them with success factors present by other researches.
Evaluation of Personality Traits for a Successful Career of Engineers
Authors: Betz Armin
Published: October 2014

Various research on aptitude testing has been accomplished yet [1,2,. Experiences from many years of HR consulting and knowledge of the industrys needs regarding to and lack of specific scientific research in aptitude testing for engineers emerged into research acivities in this field. The paper presents the data and main results of the field of aptitude testing for engineers. Its present situation as well as the reasons for that are considered and its necessity is shown. The gotten insights are presented: the existence of personality traits typical for engineers, the existence of key criteria and deduction of HR development measures necessary for a career. A newly developed personality test was applied to the occupational area of engineers. With more than 1400 tests conducted, many deductions were possible.Through the innovative approach of standard profiles of corresponding average groups rather than with demografic equivalent results could be derived. These are typical traits on the one side and development areas on the other.
Researches on the Wear of the Stamped Punches Heat Treated Differently Using the Method of Deviation from Circularity
Authors: Stancioiu Alin , Luca Liliana
Published: October 2014

This paper presents the results of some research with different heat treatments for the steel OSC10 compared to steel 205Cr115 of which have made the cut punches, each one realizing 16,000 stampings in the same technology. A study was done on the wear of used tools stamping operations using the method of deviation from circularity. Due to the fact that the material of workpiece sheet has fibers orientated in the direction of lamination the cutting tools encounters resistance in a different manner on their circumference. In some portions the edges penetrate perpendicularly to the fiber, the cutting material poses a higher resistance and obtains more pronounced wear of the edges. On the other portions, the edges penetrate parallel with the fiber, in this case the material strength is low and provides a wear less pronounced.
Influence of Processing Parameters on the Quality of the Superficial Layer after Processing Surfaces by Plastic Deformation
Authors: Botnari Vlad , Mazuru Sergiu
Published: October 2014

On the properties of exploitation of the parts, a major influence has the quality parameters of working surface. Under the term "quality superficial layer" it is understood the integrity of such indices as: geometric precision, undulation, form precision, work surface microgeometry, physical and mechanical properties of the superficial layer. In most cases, the influence of these indicators on the exploitation characteristics of the surfaces are examined separately, but of their reciprocal interaction is evident. Roughness and precision machining of the surfaces have a significant influence on the characteristics of the machine. In most cases, the roughness and precision machining is indicated depending on the operating conditions of the surface. Varying with processing parameters, we can manage forming the surface roughness and surfaces precision. In this paper will present how influencing processing parameters on surface roughness and precision surface.
Study of Residual Stresses Distribution Generated from Milling of Magnesium Alloy Parts
Authors: Chirita Bogdan , Tampu Nicolae Catalin
Published: October 2014

Magnesium alloys exhibit a very good ratio of mechanical properties versus specific weight, thus making it an important choice for parts used in automotive, aeronautic and medical industry. The distribution of residual stress in the superficial layer of the material is regarded as one of the factors defining the surface quality of a machined part. It is therefore important to know this distribution as it is closely related to fatigue and corrosion resistance, especially for the parts working in aggressive environments (i.e. biomedical devices). The present paper focuses on the determination of the residual stresses induced in a magnesium alloy part processed by milling, and their effects on surface quality.
Side Mill Tool Profiling for Generation of Helical Surfaces Determined by Reverse Engineering
Authors: Popa Camelia , Teodor Virgil Gabriel , Baroiu Nicuşor , Oancea Nicolae
Published: October 2014

The compressor rotors usually are helical surfaces with constant pitch and are composed crossing profiles. Frequently, for repair operations occurs the reconstruction necessity for one or both of the worms, drive and driven, from the helical compressors gear. The helical composed surface of rotor flank is generated usually with side mill. The knowledge of worm shape can not be made from geometrical conditions. In these conditions it is necessary to determine the flank form by actual measuring the crossing profiles of these parts. So, the theoretical helical surface of the worm is being substituted by an assembly of helical lines which together with crossing profiles forms points cloud resulted from measuring leads to a polyhedral expression of the flank rotor. Numerically, this surface type is expressed by a coordinate array which shows its discrete image. The profiling of cutting tool bounded by a revolution surface reciprocally enveloping with the substitutive surface of the helical one represents a special problem. In this paper is proposed an algorithm for polyhedral expression of the helical surface previously determined by reverse engineering methods and an algorithm for the determination of the specific enveloping condition at contact with a discrete surface.It is presented an example for a compressor rotor measured on a 3D measuring machine, the algorithm for the transformation of the gathered points cloud in a surface with polyhedral expression. Given these conditions there were determined the enveloping condition and the axial section of the side mill.
Planning, Monitoring and Controlling Assembling Activities for Oil Well Drilling Rigs
Authors: Nae Ion , Ionescu Gabriela Cristina , Ionescu Octavian Narcis
Published: October 2014

Nowadays, oil wells drilling activities are performed with a large variety of equipment.
Effect of Minimum Quantity Cooling Lubrication (MQCL) on Chip Morphology and Surface Roughness in Turning Low Carbon Steels
Authors: Maruda W. Radoslaw , Legutko Stanislaw , Krolczyk Grzegorz M.
Published: October 2014

The paper presents the results of research on the effect produced by modern cooling methods on the chip shapes and surface roughness when finish turning of ASTM A53 and AISI 1010 low carbon steels. Dry cutting, cooling by compressed air and the Minimum–Quantity–Cooling–Lubrication (MQCL) method were compared. The MQCL method is more effective for machining low carbon steel and ensures a usable chip shape and lesser surface roughness. Depending on the cutting conditions, the efficiency of the MQCL method is 10 to 30 % higher compared to dry machining. Examples of experimental investigations about reducing the use of cooling lubricant substances in turning process can be found in the open literature [1, 2].
Tribological Study in Case of Polymeric Composite Materials Reinforced with Unidirectional Carbon Fibers Having Stratified Structure
Authors: Caliman Radu
Published: October 2014

This paper presents a study of the tribological properties of polymeric composite materials reinforced with unidirectional carbon fibers having stratified structure. Unidirectional reinforces carbon fiber materials are more effective if refer to specific properties per unit volume compared to conventional isotropic materials [. Potential benefits of carbon fibers composite materials are: high resistance to breakage and high value ratios strength/density; resistance to high temperatures; low density and high resistance to wear; low or high friction coefficient. The composites are complex and versatile materials but their behaviour in practice is not fully studied. For instance, polymeric composite materials reinforced with carbon fibers after being investigated in terms of wear, did not elucidate the effect of fiber orientation on wear properties [. Is therefore necessary to investigate the effect of carbon fibers orientation on the friction wear properties of the reinforced composite materials tested to adhesive and abrasive wear. Research work has been done with unidirectional composite materials having overlap 16 successive layers made from a polymeric resin and 60% of carbon fibers. The stratified structure was obtained by compressing multiple pre-impregnated strips, positioned manually. During this experimental work, three types of test samples were investigated: normal, parallel and anti-parallel, taking in consideration the carbon fibre orientation with respect to the sliding direction. The specific wear rate was calculated according to: the mass loss, density, the normal contact surface, the sliding distance and load rating. The friction coefficient is computed function to the friction load and loading value.
Influence of Minimum Quantity Cooling Lubrication (MQCL) on Chip Formation Zone Factors and Shearing Force in Turning AISI 1045 Steel
Authors: Maruda W. Radoslaw , Legutko Stanislaw , Krolczyk Grzegorz M.
Published: October 2014

The paper presents the results of research on the effect produced by various cooling methods on the chip thickness ratio, shear angle and shearing force. Dry cutting, cooling by compressed air and the MinimumQuantityCoolingLubrication (MQCL) method when finish turning of carbon steel with different speeds of cutting and feed rates were compared. The investigations were performed in accordance with the Parameter Space Investigation method. The advantage of the MQCL is confirmed by lower values of the chip thickening ratio, shearing force and higher values of the shear angle. Depending on the cutting conditions, the efficiency of the MQCL method is 6 to 30% higher compared to dry machining.
Designing Multispeed Gear Pitch Curves
Authors: Cristescu Ana , Cristescu Bogdan , Andrei Laurenţia
Published: October 2014

As special mechanical systems within transmissions of unconventional motions, noncircular gears still offer multiple research opportunities due to their various geometries and kinematics characteristics. Investigation on noncircular gears highlights the lack of information on gears with combination of constant and variable speed, also named multispeed gears, recommended for industrial applications that require uniform speeds for different parts of a cycle, with a smooth transition between the parts. Therefore, in this paper the design of multispeed gears pitch curves is taken into account, as the first important step in the gear design procedure. Specific original algorithms are dedicated to multispeed gear pitch curve modeling, based on the definition of gear transmission ratio variation law. The next step of the multispeed gear design, the teeth generation, accessible through solid modeling or analytical procedure, will be approached in a future study.
Research on the Main Parameters of the Turbo-Blower Axes TiN Covering Process
Authors: Rotariu Constatin , Paraschiv Dragoș , Lungu Sergiu , Rusu Ovidiu , Bădănac Ana , Popa Sorin
Published: October 2014

In this paper we will elaborate a statistic analysis on the main parameters which influence the tribologic depositions process of thin TiN layers. The deposition of tribologic layers will be executed on the axes of the supercharging turbines at the automobiles made of C120, the maximum allowed thickness being of 1÷1,5μm. The main stages of the TiN coating operation are washing and drying conditions which we relate to adhesion layer deposited titanium and titanium coating process, the process consists of important elements of the TiN coating (Electron heating time-Argon plasma, electron temperature, plasma heating argon for Bias voltage ramp., Bias voltage temperature ramp., temperature ion cleaning time for coating titanium pressure nitrogen nitrogen temperature) relative to the thickness of the deposited titanium. The operation of coating with a layer of TiN will be done on a DREVA 400 machine at S.C. “Rulmenti” S.A. Barlad. The statistical analysis of the parameters will be done using the Minitab 14 software.
Experimental Research of Effective Cutting Speed Influence on Surface Roughness in Ball End Milling of C45 Material with Hardness 34 HRC
Authors: Ravai Nagy Sándor , Paşca Ioan , Lobonțiu Mircea , Banica Mihai
Published: October 2014

Machining of Complex Concave or Convex Surfaces Requires the Use of Ball End Milling Cutters. Obtaining the Expected Surface Quality Compete Various Technological Factors which should be Taken into Account. Following the Machining of the Surface with Different Inclination Angles between the Cutting Tool Axes and the Machined Surface, Significant Changes of the Surface Roughness have been Observed. Based on the Tests Performed, we can Determine the Range of the Tool Inclination Angle, which is the Best for the Surface Quality. we have also Made a Correlation between the Cutting Speeds, Inclination Angle of the Cutting Tool Toward the Machined Surface for an Obtained Surface Quality. the Presented Results are Based on Experimental Research in Industrial Conditions by Using CNC Machine Tools with 5 Axes. the Tests have been Performed on the C45 Material, Heat Treated to 34HRC.
Device for Wire Electrical Discharge Machining
Authors: Bosoancă Gheorghe , Slătineanu Laurenţiu , Coteaţă Margareta , Bădănac Ana , Manole Vasile
Published: October 2014

The problem approached in this paper refers to designing a device for wire electrical discharge machining (EDM) which can be used on a ram electrical discharge machine. Usually, wire electrical discharge machine is applied only on specialized electrical discharge machines. The device proposed in the paper will ensure widening the technological possibilities of the given ram EDM equipment. A principle schema of the device was established, after analyzing the main requirements specific to the device service. One took into consideration a possibility to rotate and fix the subassembly for guiding the wire electrode so that the active zone of the wire tool electrode has a horizontal, vertical or even inclined position. Another requirement was to ensure a way for achieving machining processes in cavities existing in workpieces of higher dimensions. Functioning of the designed device and strain resistance of some components were tested by using CATIA V5 software. Some optimization possibilities for this constructive solution of the device were identified.
Bearing Scuffing Detection and Condition Monitoring Using Virtual Instrumentation
Authors: Bujoreanu Carmen , Breabăn Florin
Published: October 2014

Bearing condition monitoring confronts the most machine users. Diagnostic methods used to include bearing problems represent one of the most important challenges. The scuffing phenomenon initiation of the bearing elements produces an important increase in the vibration level and can be emphasized by the analysis of the bearing friction forces which are the most sensitive indicator of the bearing failure. Commonly used technique for damage detection is the vibration signature analysis that must be carefully utilized in conjunction with the friction torque monitoring through the strain gauges measurements. In order to detect the scuffing onset, the paper presents an experimental setup for the scuffing tests performed on a 7206 ball bearing. A virtual instrument monitoring the friction force respectively the braking torque was created. An accelerometer captures the signal from the bearing outer ring then it is processed using PCI-4451 National Instruments data acquisition board and LabVIEW soft.
Comparative Study of Blade Shape Design of Centrifugal Fan Impeller
Authors: Zahariea Dănuţ
Published: October 2014

For a centrifugal fan impeller the blade shape can be defined using two parameters: the blade angle and the blade width. There are different design methods depending on the assumption made on both the blade width and the blade angle. In this paper four design methods are presented: constant blade width and variable blade angle; hyperbolic blade width and variable blade angle; hyperbolic blade width and constant blade angle; linear blade width and variable blade angle. The sequential algorithm for solving the characteristic system of equations, which defines the blade geometry, is implemented in a MATLAB script file, for which principal code lines are explained. In the solving process of the characteristic system of equations for all four design methods considered, different relationships for relative velocity are obtained. The comparative graphical analysis of impeller blades obtained by all of the four design methods, as well as the blade geometry parameters is presented.
Analysis of the Collapse Behaviour Regarding TWB Crash-Boxes in Conjunction with the Construction Technique
Authors: Ciubotariu Vlad Andrei
Published: October 2014

The crash-boxes are thin-walled structural components with rectangular cross-section which are utilized in the construction of the resistance body structures in the auto industry. This components can be manufactured from various materials including homogenous steel sheet metals, tailor welded blanks (TWB) or even composite materials. The benefits of using TWB were shown in numerous studies before and they are not the main purpose here.This research focuses on the collapse behaviour of TWB thin-walled structures with rectangular cross-section subject of impact loadings. The main objective is to design a crash-box which allows the absorption and dissipation of great kinetic energy constituting better resistance structures for car bodies.After analysing the resulted data, a few aspects regarding the TWB crash-boxes were revealed and some conclusions could be suggested: the weld line generates a barrier like zone which delays in some manner the propagation of the progressive buckling levelling the mean crash load; no flange crash-boxes presented best results regarding the mean crash load even if the data were very close to the other crash-box types. Furthermore, the peak crash load was at maximum level comparing with the other crash-box types. This collapsing behaviour of the no flange crash-boxes could be assigned to the fact that the bonded sides of the structure work like double walls into the same cress-section and is not really affecting the asymmetric crash mode of the structure.
Experimental Study of Vibrations in Face Milling Cutting
Authors: Oniţă Gabriel Vasile , Brîndaşu Paul Dan
Published: October 2014

The paper consists of a research in designing and experimental analysis using a face milling cutter with round inserts. A general model for the new cutter is proposed taking into consideration multiple aspects regarding monitoring and controling the milling process. A comparison of measured vibrations when cutting with different parameters for two constructions of the milling head is presented. The objective of this vibration comparison is to verify wether the new design behaves in similar way with the classic and proven concept of insert clamping using a central screw.
Noncircular Gears Designed by Geometric Hypothesis
Authors: Andrei Laurenţia , Vasie Marius
Published: October 2014

Noncircular gears are continuously challenging the specialists from the gear industry, due to their industrial performance and new research abilities induced by the advances in virtual modeling and processing technologies. The authors propose the Gielis’ supershape as the chosen geometry for the driving pitch curve in order to generalize the noncircular gears design. Specific algorithms are developed in accordance to the supershape geometry complexity and restrictions resulting from a “technical” selection of a proper pitch curve from the wide family of supershapes. Original steps and codes enrich the traditional noncircular design procedure, divided into: i) studies on the influence of the supershape defining parameters on its scaled geometry, according to specific gear data such as number of teeth and gear modulus; ii) generation of the driven gear pitch curve, based on the kinematics and geometric conditions of pure rolling between mating centrodes. New codes and an iterative procedure are applied to solve the step key problem, respective the center distance determination, respectively; iii) noncircular gear virtual generation, developed using both solid modeling, for the gear cutting process simulation, and analytical procedure.
The Pinion Cutter for Profiled Holes – Graphical Method in CATIA
Authors: Berbinschi Silviu , Teodor Virgil , Frumuşanu Gabriel Radu , Oancea Nicolae
Published: October 2014

In this paper, we present a graphical method, developed in CATIA environment, based on the method of substituting circles family and dedicated to profile pinion cutters for generating interior surfaces. Hereby, the family of substituting circles associated to the worked piece (the profile to be generated) is determined at the same time to the curve transposed, in the rolling motion, to the tool centrod. After finding the position of the contact points between the generated profile and the family circles, we can determine, in the transposed family, the locus of the points from the reciprocal enwrapping profile the pinion cutter profile. The paper also includes a method application for generating a hole with square transversal section, and a comparison between the profiling results when using the graphical method, versus an analytical method. The results prove the coincidence between the two profiles determined as above, on one hand, and both rapidity and precision of the graphical method, on the other hand.
Experimental Framework for FEA Analyses of 3D Geometry of a Connecting Rod
Authors: Mihalache Andrei Marius , Nagîț Gheorghe , Rȋpanu Marius Ionuţ , Boca Mihai , Hurja Ionel Iulian
Published: October 2014

In the present study the authors propose an experimental framework in order to perform FEA analyses upon a 3D model of a connecting rod. The study presents some of the technical issues that have been overcome by choosing the right software tools and the differences in terms of results that they may produce, it shows the setup used in the analyses including its constraints and loads, the proposed algorithm that imposed the number of analyses as well as their type, and the way the analyses were conducted in order for the results to validate or invalidate a optimized model. Because the connecting rod's 3D model presents a high level of complexity in terms of the number of free forms surfaces contained within the geometry, the authors propose a procedure by which they divide the geometry in areas of interest and in doing so can determine the most critical and the most affected areas under a given load for each FEA analysis. This procedure allows a virtual perspective of the modality through which the considered part gets affected and behaves under a given load in terms of distribution of stress and deformation, results that are consistent with its overall behavior.
Consideration about Elastic Couplings Modeled in CATIA
Authors: Urdea Mihaela , Butnariu Silviu
Published: October 2014

This paper refers to an elastic shaft coupling named Vulkan coupling, with its general behavior. Vulkan shaft couplings link two shafts in diesel-engine and electric drives. They are simple from the construction point of view, are easily mounted and dismounted. Parts and assembly modeling, preprocessing, processing and post processing can be performed using all leading CAD tools, like CATIA. The main goal of this work is to generate a finite element model for a Vulkan coupling, using FEM Solid (FMD). For the demonstration, a Vulkan coupling with a torque of 350 Nm has been chosen. At the end of the modeling with finite element, it results that, for intermediate coupling elements with mechanical material properties very different from those of steel components, MEF analysis with rubber parts only is to be preferred. The other components can be simulated using the virtual rigid elements.
Software for Computing Lenticular Compensators (Bellows)
Authors: Scheibner Emilia Marinela
Published: October 2014

Expansion joints are used in installations where axial or angular significant changes occur due to operating conditions: differences temperature, arching, vibration etc. Expansion compensation will take over the pipe stresses, preventing so their destruction. Lenticular compensators take pipe thermal expansions; metal compensators are use for take axial, lateral or angular displacement. This paper presents information regarding the lenticular compensators and calculation procedure of their geometrical characteristics, mainly the number of elements that composed them. An automatic calculation program ”CCRT - Comp Lent” (computing pipeline heating systems – lenticular compensation) was developed based on fundamental concepts in mechanical calculation of pipes and lenticular compensators. The algorithm of this program is based on determining the pipeline expansion, the total deformation and the number of the compensation required.
Methods for Checking the Symmetry of the Formula One Car Nose
Authors: Neamțu Călin , Bere Paul
Published: October 2014

Checking the symmetry of a Formula One (F1) car nose requires the measurement and inspection of complex surfaces and raises a number of challenges both in terms of the equipment used and the measurement strategy. Verifying the symmetry allows the identification of the asymmetrical areas regarding the critical aerodynamic elements of F1 car nose. This paper presents three methods to check the symmetry of a F1 car nose and to determine the deviation using symmetry points (by points measuring) in plane using 2D scanned profiles and 3D laser scanned surfaces. In order to acquire the symmetry points, and to scan the profiles and the surfaces, a state of the art multi-sensor CMM (Coordinated Measuring Machine) has been used and the data has been processed in CATIA V5.
Study and Improvement of Road Tunnels Fire Behavior Using Pyrosim
Authors: Codescu Silviu , Panaitescu Valeriu , Popescu Daniela , Chisacof Alexandru , Anghel Ion , Serban Manuel
Published: October 2014

Nowadays the world is facing an increasingly traffic, especially in the road. In order to short the distances and cross various road areas, road tunnels are built frequently and longest as possible. One of the greatest emergency situations that can occur in road tunnels, is represented by fire, involving all conditions relating to the nature and density of combustible materials existing, smoke, toxic gases and the combustion debris from fire fighting and action in order to minimize the negative consequences of it. Also, road tunnels represent semi-closed and closed spaces, with high fire risk, so no easy fire safety management opportunities can be used. Road tunnels can be framed in the category above mentioned, being exposed to a high traffic, because most of them are 20-30 years old and were built for the traffic estimated of those times. A simulation using Pyrosim software is based on the physical model in which one electrical fault accident involving a car appear. The accident, consisting in a fire event at one stationary car, is modeled at 1.5 m height. Considering an electrical fault followed by a fire, temperature and smoke spreading depending on time in this tunnel were obtained. Also, sprinklers have been used in the simulation time, in order to give an accurate firefighting simulation. There were obtained important values which allow us to realize an appropriate impact on the event in aim of minimizing the time for a promptly intervention and to limit the damages.
Structural Optimization of an Automatic Pallet Changer Mechanism Using the Tree-Graph Method
Authors: Mihăilă Lucian , Stan Gheorghe
Published: October 2014

In this article we present a methodology of minimizing the number of movements performed by an existent pallet changer mechanism attached to an horizontal machining centre. After analysing the existent pallet changer mechanism along with the machining centre we obtained new optimized constructive alternatives regarding the number of movements performed by the pallet changer. After applying the tree-graph method we had optimized structurally the considered pallet changer mechanism and obtained the constructive configuration which performs the least movements in order to change the pallet. The small number of movements of the resulted pallet changer mechanism helps the design engineer to choose the most simple structure which reflects positively in the production cost. The minimum movements number obtained by making use of this method will lead to a simplification of the driving, command and control system of the pallet changer mechanism.
About the Accuracy of Positioning of a Linear Robot Equipped with a High Resolution Optical System
Authors: Nasui Vasile , Banica Mihai
Published: October 2014

Robots have rapidly become key elements to improve general performances of the existent products, to add up new supplementary characteristics or even in view of creating new products that were impossible to create prior to this research. This paper presents a measuring system with optical device in view of determining velocity variation on the investigated axe of the maximum velocity and acceleration or of their variation in dynamic circumstance. The advanced research of precision parameters is a technical necessity, which leads to the selection of linear actuators according to the conditions of usage. Has been made a measurements stand in order to determine these parameters, a stand equipped with laser ruler with a system of numeric acquisition of experimental data. By analyzing the measuring values presented in this paper it can be concluded that when the positioning precision in the target - point of an acting linear robot or when the trajectory precision is absolutely required, the obtained results must be taken into account. We can operate these appropriate corrections in the system of dynamic programming of the robot.