bluuebunny/crossref_metadata_2025 huggingface dataset:
Planned Traffic Stability on a Rail Network
Authors: Ștefănică Cristina , Dragu Vasile , Burciu Ştefan , Ilie Anamaria , Dinu Oana
Published: November 2015

Impetuous multiplication of mobility and road traffic proliferation lead to concerns for increasing the attractiveness of urban public transport. Compared to private car use, urban public transport attractiveness is conditioned, in particular, by travel times and certainty of respecting the transport schedules, meaning planned traffic stability. Traffic schedules are considered to be more stable as the primary delays from the announced schedule have low probabilities and values and their propagation as repeated delays is least noticed in time and space. Solutions for assuring traffic stability must take into consideration contradictory aspects, because introducing time reserves in the schedules means time travel extensions. In order to assure the stability of planned traffic, present paper develops studies of various models and methods that aim to reduce inherent primary delays. Thereby, for studying repeated delays on a complex network, a mathematical model adequate to a Discrete Event Dynamic System (DEDS), that in MAX-PLUS algebra becomes a linear system, was used. The paper concludes with a case study on an integrated network resulted from the superposition of Bucharest’s existing suburban rail network with the underground network designed for 2030, being identified measures for improving the stability indicators. Traffic stability is assessed on the basis of two indicators: instability coefficient and delay elimination rate. Main measure for improving stability indicators is the growth of time reserves taking into consideration the quality requirements resulting from the condition of maintaining a reduced planned travel time.
Reliability Analysis of Railway Freight Wagon Wheelset
Authors: Spiroiu Marius Adrian
Published: November 2015

The aim of this paper is to analyze the reliability of freight wagon wheelset on the basis on real field data, observed and collected in actual operations of freight wagons. The failure modes and their associated occurrence absolute frequencies are identified and a Pareto analysis is carried out.The Weibull probability distribution is used to determine the reliability mathematical model for railway wheelset. The probability law is linearized, allowing the use of linear regression to estimate, on the basis of empirical data, the˰̸̵̱̓̀˰̵̵̱̱̀͂̽̈́͂˰ڂ˰̴̱̾˰̸̵̈́˰̵̳̱̼̓˰̵̵̱̱̀͂̽̈́͂˰ڇ of Weibull distribution. The estimated reliability model is close to an exponential one, assuming a failure rate almost constant.The estimated reliability probabilistic model i̓˰̴̵̴̱̼̹̱͆̈́˰̲͉˰̵̶̷̹̀͂̿͂̽̾˰̱˰ڗ2 test to verify that the estimated theoretical reliability mathematical model fits the the empirical distribution.
Optimizing Power Consumption of the Electric Vehicle Traction
Authors: Popa Gabriel , Sebeşan Ioan , Arsene Sorin , Oprea Răzvan , Badea Claudiu Nicolae
Published: November 2015

The study refers to optimizing energy consumption from electric trains, underground trains and electric locomotives. The actual requirements of the dynamic market economy are forcing the railway system to transform into a reliable alternative to the road and air traffic. From this perspective, the railways have to fulfill two key elements: Economical efficiency and reliability and to offer what the potential customer needs. One of the main elements is the respect of the timetables or (if possible) the decrease of the running times. The running time is the main referential, especially when it’s related to the power consumption. The optimization of the running times and the power consumption is the most important target for railway operators and depends on the correct choice of the drive regimes. Article deals with energy optimization from the perspective of traction. Analysis can be applied also to diesel railcars and diesel locomotives.
Considerations on Dynamic Contact Force with Catenary for the EP3 Pantograph
Authors: Sebeşan Ioan , Arsene Sorin
Published: November 2015

Power supply the energy needed for locomotives and electric trains is performed by means of pantographs on the bodywork. These high performance producing vehicles in so far as the contact between the collector (pantograph) and the catenary (contact line) is achieved and maintained regardless of speed. Thanks to the constructive type of the pantograph and the location of the contact force varies in relation to speed and can give rise to phenomena of oscillators that enhances the vertical movements of the wire feeder. As such the problem is essential for a good current collection is dynamic in nature. The most favorable way of current collection is achieved when between full and contact wire can maintain contact through a permanent and constant contact, a situation difficult to achieve in practice because of the first bump of the contact line. Juddering movements in vehicle while walking to a modification of the contact pressure which, however, it was found that is negligible in relation to the wave-like movements of the contact line. This article has looked at what is the dynamic contact force variation where the pantograph is located on the body of the locomotive EP3 LE 060 EA of 5100 kW. For this I started from the constructive characteristics of the components of the pantograph.
Influence of Wind on the Aerodynamic Resistance for a Case of the Arrangement of the Equipment on Locomotive Bodywork LE 060EA
Authors: Arsene Sorin
Published: November 2015

In the case of electric railway vehicles of surface, the equipments which allow power supply are placed on their bodywork. The mode to dispose these equipments contributes to increase the resistance to motion of the vehicle due to the variation cross-section area. Gusts of wind that occurs during the movement of vehicles lead to increased aerodynamic forces. As a model analyzed, we considered the situation determined by the dispose of the equipments supply on the body of electric locomotive type LE 060 EA of 5100 kW, when such a vehicle is travelling with the first post station in the driving direction. The equipment’s components of supply were modeled geometric at scale 1: 1 in 3D. The obtained assembly was imported in an air flow simulation program to determine the aerodynamic resistances. To observe which is the influence of the gusts wind regarding the resistance to moving we considered five point values for wind speed: 5m / s, 10m / s, 15m / s, 20m / s and 25m / s. With results of the simulations we performed a comparative analysis.
Studies on the Determination of Cutting Regime Optimal Parameters for Drilling Operation – Comparative Analysis between the Results Obtained by Using Analytical Method and Automated Method of Calculation
Authors: Nae Ion , Ionescu Gabriela Cristina , Ionescu Octavian Narcis
Published: November 2015

From practical experience is well known that the establishment of the right values for the cutting regime parameters (without taking into consideration the cutting schematics) is requiring a large volume of work, thorough calculations and accurate input information regarding the process to be conducted. The high competition from the market is generating increased requirements concerning the productivity of processes, quality of the products as well as the production costs. There it is a strong correlation between these issues and the accurate determination of the cutting regime parameters. This article presents the methods of calculation for the cutting regime parameters for drilling process by using analytical method (classical) and automated method (by using specialized software packages) and the analysis of the results obtained with the goal of establishing which of them are providing the best results in the shortest period of time.
Automotive Engine Air Filters Testing on a Specialized Rig Using Controlled Dust Loading
Authors: Toma Marius , Fileru Iordan
Published: November 2015

In order to better protect the engine, air filters with high efficiency should be used as well as appropriate maintenance activities. Maintenance activity must take into account the behaviour of the air filters during exploitation, namely the increases of the gaso-dynamic resistances they produce while air filters are used. This paper presents the variation of the pressure restriction depending on the amount of dust retained by the air filters and also the storage capacity of dust by the air filters. Filters are loaded on a laboratory rig with dust from the roads of Bucharest.
Case Study of Ship Squat in Sulina Channel Using NTPRO 5000 Navigational Simulator
Authors: Șerban Petru Sergiu
Published: November 2015

paper presents a case study of ships passing through shallow and narrow waters in Sulina Channel. The method used in this research was simulation using NTPRO 5000 navigational simulator and it was studied the variation of ship squat, draft and under keel clearance for several military ships similar to Romanian Navy vessels, sailing with different speeds. The purpose of this research was to find out which ship types could navigate through Sulina Channel and what is the maximum speed they could pass without grounding due to ship squat. The integration of the trials results showed what the safe speed for each vessel was and it was concluded that the maximum speeds were 8, 12, and 16 knots. Also, a difference between desired and real speed was observed, caused by the restrictive navigation condition. Numerous researches are being done in ship squat domain and Sulina Channel is one of the canals where this phenomenon is studied, but squat simulation on military ships has never been done before in this canal.
Lightweight Vehicle Structural Design with Advanced Steel Grades and Profiles
Authors: Ulianov Cristian , Shaltout Ramy , Balan Adrian Ciprian
Published: November 2015

In the recent decades, the vehicle lighweighting problem has been addressed through various methodologies by different researchers and industries. Significant effort has been made recently to develop lightweight structural solutions by employing state-of-the-art and emerging materials, manufacturing processes and technologies. The presented research aimed to investigate the possibility of designing vehicle lightweight structures using advanced steel grades and novel structural profiles developed by industry by integrating smart design and manufacturing solutions. A case study was developed in the presented paper on a freight wagon structure. The structural stress analysis of the new lightweight design has been carried out through Finite Element Analysis (FEA) for validating the proposed solutions. The FEA considered the standard loading scenarios, taking into account both the static and dynamic operational loads, and the results were evaluated against the traditional design of a similar benchmark homologated vehicle. The results demonstrate that novel steel products can be successfully employed for designing sustainable and feasible lightweight vehicle structures.
Determining the Driving System for Robots with Delta 3 DOF Parallel Structure, Using SolidWorks
Authors: Andrioaia Dragos , Rotar Dan
Published: November 2015

The robots which are composed of mechanisms with Delta 3 DOF parallel structure are increasingly used due to the advantages they poses such as high rigidity and that they can be used at high speed and acceleration. When the mechanical structure of the parallel robots with Delta 3 DOF structure is designed, a proper selection of the drive servomotors is imposed. The drive servomotors are chosen according to the values of the torque needed for the manipulated object to move in the workspace along a trajectory with a specific speed and acceleration. In this paper, the authors approach the study regarding the variation of the drive torques of parallel robots with Delta 3 DOF structure, when the manipulated object moves along a trajectory with imposed speed and acceleration, in order to choose the drive servomotors. In order to determine the value of the drive torque, SolidWorks software was used. From the results obtained by experimental means, it has been revealed that the usage of the software packages in the dynamic simulation of the mechanical assemblies determines the shorten of time, costs of projection, in comparison with practical testing which supposes the realization of the prototypes physically, expensive and time consuming process.
Application of Taguchi’s Method for Study of Machining Parameters on Surface Roughness of 7136 Aluminum Alloy in End Milling
Authors: Bonţiu Pop Alina Bianca
Published: November 2015

Starting with the necessity to identify the optimum values of the cutting parameters which are affecting the surface quality, it is appropriate to use the design of experiment techniques to conduct the experiments. Previous researches [1] focused on the investigation of the effects of machining parameters on surface roughness. In this paper, the experiments were conducted based on the established Taguchi’s technique, L8 orthogonal array using Minitab-17 statistical software. Three machining parameters are chosen as process parameters: Cutting Speed, Feed per tooth and Depth of cut. The orthogonal matrix includes these three factors set for analysis, each with 2 levels associated. The level of influence that the process parameters exert on the surface roughness is analyzed by Taguchi method data analysis. In this case the signal to noise ratio was tacked into account. Also, the recommended configuration regarding the optimum values of these parameters was determined as well as the interactions between them, in order to obtain better surface roughness for 7136 aluminum alloy machining. The final results will be used as data for future research.
A New Approach to Achieving the Command and Control Modules Embedded in Smart Home Building
Authors: Puiu Petru Gabriel , Andrioaia Dragoș , Toma Cornel
Published: November 2015

This paper proposes a new approach to achieving the command and control modules that can be embedded in smart home building. As a result of this new approach, the house, which in the classical sense, corresponds to everyday family activities, becomes a place that can be monitored and controlled in real time, to ensure comfort their occupants. The embedded equipment can be sensors for data collection, actuators for operating various functions and a control unit which records data on which decisions can be made complex. The software programming used is Lab View. The challenge is determining how "smart home" is able to communicate with all components.
Shape Recognition and Measurement of Position and Orientation of Different Parts Produced within a Manufacturing Process
Authors: Cohal Viorel , Cohal Alexandru
Published: November 2015

In a manufacturing process it may be necessary to distinguish the parts of various types produced by different machine-tools and placed on a conveyor. Using an artificial vision system represents a possible solution. Images of the parts can be periodically taken using a video camera. It is considered that all parts are positioned with one of the faces which defines its type on the upper side. Thus, parts’ recognition can be solved by recognizing the shapes from the images. In addition, information about position and orientation of parts can be determined using the captured images. All these information are listed in a text file which can be used by a decision algorithm. This algorithm can choose which parts are useful to assemble different objects. An industrial robot can be commanded using a program written in RobotStudio environment’s programming language (RAPID) to pick the needed parts and place them in a storage area.This paper describes a recognition and measurement of position and orientation method of the different parts produced. In addition, details about implementing this method in MATLAB environment using Image Processing Toolbox and geometrical relations are provided gradually.
Design for Skin and Shape: An Innovative Design Approach
Authors: Kyratsis Panagiotis , Efkolidis Nikolaos , Manavis Athanasios , Tsagaris Apostolos
Published: November 2015

Although all aspects of a product design are demanding and need several resources to be completed, Design for X (DfX) represents a series of formal methodologies used to optimize a specific aspect of the product design under consideration. Those DfX tools deal with different stages of the product design and there is considerable gap concerning the package design cycle. The proposed methodology Design for Skin and Shape (DfS&S) is focused on the package design industry and offers significant advantage towards its success. It helps the designers to be focused on shapes that are easily recognized by the customers and then create appropriate graphics for them. Following this approach, it is easier to create an innovative optical identity for the product and its packaging during the conceptual stage. The methodology can reduce the development time of the package, while designers have in mind, from the beginning of the design process, the shape which will guide them to its completion. Following the proposed methodology different packaging designs are presented.
Some Aspects about Product Management of Electric Arc Furnace Elements
Authors: Ioana Adrian , Semenescu Augustin , Marcu Dragos , Pollifroni Massimo , Březinová Monika
Published: November 2015

The methodology of establishing an Electric Arc Furnace (EAF) and technological plant’s best management strategy is based on the “technological process – technological plant” interdependences. The paper presents the best management of a plant and consists of an assembly of operations, measures and decisions, established and applied in order to make the technological process more efficient from the technical – economical point of view. We present constructive and functional description of an Electric Arc Furnace such as: refractory masonry; metallic construction; electric installation. We also present the best management of a plant consisting of an assembly of operations, measures and decisions, established and applied in order to make the technological process more efficient from the technical–economical point of view, Electric Arc Furnace management included.
Management Methods to Modify the Produced Products Volume
Authors: Filip Florina Cristina , Marascu-Klein Vladimir
Published: November 2015

This paper aims to analyze processes of an automotive industrial company in order to identify and implement management methods to modify the volume of produced product starting with the changing request through to the handover of the first produced and approved new product status to volume production. The specialist scope extends to each volume of produced product or part thereof, irrespective of whether this was produced in-house or externally sourced. The effects of a product modification on the production process, purchased parts and production resources are included in full. A modification can be implemented with or without a modification project. If a modification is implemented within the scope of a modification project, the regulations governing product development process projects apply. The application process of modifications comprises the modification request, define modification scope, analysis of consequences and approval of modification request. The decision and responsibility to implement the modification process in volume of produced products lies to the product line manager. Every modification type constitutes a product change and can be mapped in various ways in a system.
Application of Graph Theory for Production Orders Sequencing in Mixed-Model Production Systems
Authors: Zemczak Marcin , Skołud Bożena , Krenczyk Damian
Published: November 2015

In this paper, problem of sequencing of production orders in mixed-model assembly systems is being analysed. The sequencing in such system is mostly addressed as a CSP problem (Car Sequencing Problem) and due to the fact that no optimal method of solution has yet been found it belongs to the NP-hard problems [1,2]. The NP-hardness of the problem has been proven in [3]. The problem connected with proper sequencing arises from the fact that nowadays it’s the clients who have the biggest influence on the sellers offer. The possibility to customize almost each and every product complicates the production management, as instead of having 10 different products, the number of them may grow up to few hundreds [4]. The problem may be especially observed in automotive industry, however recently it may be also met in household appliances industry, as mass customization can be also observed on that market. Each product may differ in labor-effectiveness, and due to the fact of carrying the assembly in linear assembly systems, each unevenness, each transgression of takt time on a single work-station may lead to the line stoppage.
Implementation and Benefits of Introducing a Computerised Maintenance Management System into a Manufacturing Company
Authors: Krolczyk Jolanta B. , Legutko Stanisław , Wojtecki Dawid
Published: November 2015

Maintenance service is the necessary organizational structure in the modern manufacturing company. Everyday maintenance services operation would be greatly impeded without a computerised maintenance management systems (CMMS) software. CMMS allows to manage company’s equipment, planning inspections and maintenance and management supervision procedures and service documentation. The aim of this study is to present the analysis of the manufacturing company in the maintenance department, the main objectives of the company related to the maintenance, a pre-implementation analysis (objectives, assumptions, hard results, ABC analysis), and proposals to choose computerised maintenance management systems, which will allow to reduce failures, downtime and maintenance costs.
Monitoring of the Human Resources Process: Examples in Automotive Industry
Authors: Misztal Agnieszka , Belu Nadia , Rachieru Nicoleta
Published: November 2015

The article is dealing with two problems regards the quality management in automotive industry such as: human resources management and processes monitoring. This connection is really difficult because of entrepreneurs generally have a problem with processes monitoring. Additionally human resources management is unmeasurable, so measurement must often be done using qualitative criteria, rather than quantitative. Furthermore the regulations of the new ISO 9001 include evaluate the performance of processes. It emphasizes the importance of the problem. The study provides examples of ways to monitor the process of human resource management in small and medium-sized enterprises automotive. Examples were evaluated for suitability to assess the effectiveness of the process and to generate guidelines for improvement. The form of keeping and visualization in order to use the information for periodic reviews of the management was discussed.
Contributions Regarding the Application of the Six Sigma Method in Tourism as a Quality Engineering Method
Authors: Țîțu Mihail Aurel , Răulea Andreea Simina , Țîțu Ștefan
Published: November 2015

The problem of quality and customer orientation are the most important leverage in obtaining success. Over the time, the influence of human resources in terms of training, controlling and shaping client expectations has gained significant meanings. Research in this field has led to the formulation of the hypotheses according to which human resources can represent a vital element in obtaining a competitive advantage. In line with the importance of the topic addressed, the main objective of these scientific approach is to identify the current problems related to the quality of Romanian tourism services and to propose a improvement program using the six sigma method. The paper provides an excellent resource for many researchers who are engaged in research and applications of Six Sigma in the tourism industry. Moreover the dearth of literature on the use of Six Sigma in the tourism sector makes this paper count.
Study of the Rotation Accuracy Motion of a Workpiece with Radial Deflection Processed by Turning
Authors: Boca Mihai , Nagit Gheorghe , Horodinca Mihaita
Published: November 2015

During cutting processes, due to the multiple causes which they have their error sources into the technological system, appears a series of processing errors. Depending by the source of influence, the radial deflection error will affect the accuracy of work piece processed. This paper proposes an experimental study under the aspects which follow the elimination of the radial deflection of a processed work piece. For that, it will be applied the principle of removing the excess material, by multiple processing passing over the processed surface, in order to eliminate the radial deflection. This research supposes that the radial deflection could be studied by measuring the relative distance between a transducer and the considered work piece, considering the machine tool as experimental stand.
SWOT Analysis for Determining the Role of Entrepreneurial Skills in Industrial Successful Business
Authors: Stan Luciana Cristiana , Nedelcu Anisor
Published: November 2015

Examination of the factors determining the success or failure of a business in an enterprise, facilitated the creation of specific methods of analysis and diagnosis of business activity in the industry by determining the role of entrepreneurial skills. Environmental analysis method, competitiveness and industrial company is SWOT analysis. SWOT analysis is considered a complex research of economic, technical, and management of industrial production that characterize a society that identifies the strengths, weaknesses, opportunities, threats and causes it generates, make recommendations to eliminate or minimize the issues and / positive or negative recovery. Production management conducted using SWOT analysis entrepreneurial skills in industrial companies can be used as a model for defining entrepreneurship and building strategies as a basis for the creation of national and international brands of industrial. For choosing the optimal analysis of entrepreneurial skills in industrial companies is necessary to maintain cost efficiency through economic links created between departments of industrial society. Development of industrial values is based on sustainability and management of production, which can be created between technical and economic services company. Promoting entrepreneurial skills in the management of industrial companies is focused on strengths as well as opportunities arise, a very thorough SWOT analysis and professional company that can radically change the industrial market.
The Cycle Time Stochastic Distributions in Simulation of Manufacturing Systems
Authors: Gingu Boteanu Elena Iuliana , Zapciu Miron , Mohora Cristina
Published: November 2015

The paper presents a theme of research through the analysis of flows' modelling and simulation in a flexible manufacturing system. It is studied the simulation with discrete events of a real manufacturing line with the software Delmia Quest. The objectives of this paper are to modelling and simulate the manufacturing system and to choose the properly probability distributions of a cycle time of each machine from this layout. A comparison of three distributions is presented and SCL implemented program will automatically display the values resulting from the manufacturing system simulation.
Transient State Analysis of Queue-Size Behavior and Throughput of the Manufacturing Line with Finite Buffer Capacity and Machine Setup and Closedown Times
Authors: Paprocka Iwona , Kempa Wojciech M. , Krenczyk Damian
Published: November 2015

A single machine queuing system with setup/closedown times generally distributed is considered. Production tasks enter the production system with exponentially distributed interarrival times and are served by times assumed to be generally distributed. Arriving production tasks form a single waiting line and are served in the order of their arrivals. A production task is stored in a finite-capacity buffer if it arrives and the machine is busy or setup activities are done. Whenever a production system is empty, the machine is stopped by a closedown time. The machine needs a setup time before providing the service of the first task after the idle time.
An Idea of the Continuous Flow for Concurrent Multi-Assortment Production
Authors: Skołud Bożena , Krenczyk Damian , Zemczak Marcin
Published: November 2015

Nowadays in the era of advanced stage of Lean Manufacturing concept forces manufacturers to research of new idea of the production flow organization and to implement more and more innovative organizational solutions. The article presents the authors concept of implementation the combination of continuous flow and concurrent multi assortment production. Continuous flow is an approach to discrete manufacturing that contrast with batch production and is associated with just-in-time and Kanban production. The goal is an optimal balanced line. The paradigm aim is to achieve single-piece flow. For this purpose the similarity of the products that use the shared resources and start their production one by one in a predetermined sequence is searched. In addition, it is recommended to transform the internal setup into external one for eliminating investment in set-up times. This concept is similar to the group technology developed down in 70’s and based on the classification of products into four groups.
Using Discrete-Event Simulation Systems as Support for Production Planning
Authors: Krenczyk Damian , Olender Malgorzata
Published: November 2015

In the days of fierce competition, rapid changes and new technologies, production, and above all, production planning and control cannot be implemented in isolation to changes in the market. The ability to quickly adjust to changes, being flexible is now essential for high tech companies. One of the key area of production management, that must continuously evolve by searching for new methods and tools for increasing the efficiency of decision-making process is the area of production planning and control. In solving the problems associated with production planning are increasingly used advanced simulation programs. They support the planners, especially in situations related to changes in the assortment, or the introduction of new products into the market. A practical example of using the simulation program for production planning is presented in the paper. It is shown that an advanced simulation program can be an effective tool used in decision making area. The construction of the model, and performed experiments are crucial for enterprises where among other things punctuality and flexibility are the most important elements. A short time for the results of the simulation allows for quick response and, if necessary, make changes to the model by planners to achieve the best results with the given parameters associated with the required to complete the production orders.
Scheduling Schemes Based on Searching the Aggregated Graph of Operations Planning Sequence
Authors: Kalinowski Krzysztof , Paprocka Iwona
Published: November 2015

The searching state space in scheduling of real manufacturing systems with discrete and multi-assortment production is discussed in this paper. The production load is represented by a directed and/or graph called “the aggregated graph of operations planning of the set of orders”. It determines the order of operations, according to which they will be inserted into a schedule. This order must always comply with all assumed precedence and resource constraints and also with given scheduling strategy of a production order. In the elaborated representation the complex products structures and alternative routes of their realization are also considered. The most important issues related to searching this space are discussed in this paper. These include: a general method for searching the graph, sequencing of parallel processes and operations using schedule generation schemes and selection of routes variants.
Application of Recently Developed MCDM Methods for Materials Selection
Authors: Petković Dušan , Madić Miloš , Radovanović Miroslav , Janković Predrag
Published: November 2015

It is well known fact that materials play an important role in engineering design. Nowadays over a hundred thousand available materials can be distinguished with constant tendency for increasing the novel designed materials. Therefore material selection process becomes a complex and time consuming task. Selection of the most suitable material for a given application can be regarded as a multi-criteria decision making (MCDM) problem with conflicting and diverse objectives. New MCDM methods have been developed, and existing methods improved, showing that research in the decision-making is important and still valuable. This paper describes the use of recently developed MCDM methods, i.e. Complex Proportional Assessment (COPRAS) and Weighted Aggregated Sum Product Assessment (WASPAS) for selecting the most suitable hard coating material.
Beyond Target Costing: Manufacturing Cost Policy Deployment for New Products
Authors: Posteucă Alin , Zapciu Miron
Published: November 2015

The purpose of this paper is to present a method to quantify the costs of potential losses from production processes for new products to prioritize improvement projects based on the target cost and provide data and information for feasibility studies of continuous improvement projects. The specificity of the manufacturing cost policy deployment for new products is to identify the percentage of cost of future production phases which does not add value from a customer perspective, dynamically throughout the product life cycle. The percentage of non-value added cost is based on loss of each manufacturing process and is determined scientifically based on data and facts. Using the proposed method helps manufacturing companies in the acceptance of certain orders which at first glance are unprofitable. Moreover, the proposed method will help develop scenarios for continuous cost reduction after starting production through continuous improvement of productivity and quality required. The empirical results are based on the study during a year and a half in the automotive company, using action research methodology.
Semi-Automated Data Acquisition for Management of the Company in Non-Automated Production System – Case Study
Authors: Ćwikła Grzegorz , Grabowik Cezary , Kalinowski Krzysztof , Janik Witold
Published: November 2015

This paper presents case study of data acquisition in non-automated discrete production system. The issue of acquisition of data from the production system in order to support company management is essential for the integration of business and manufacturing areas of the company. Properly organized data acquisition system, consisting of hardware, software and organizational solutions, should provide access to real-time data on production tasks, flow of materials and work in progress, usage and effectiveness of workers and equipment, and the quality of production. Availability of data depends on type of production system, more precisely on the level of automation of technological processes. The Manufacturing Information Acquisition System (MIAS) methodology has been used in order to support design of the data acquisition system for the company producing large tanks, in which there is no automated equipment and most of production operations are realised manually. The algorithm of acquiring data from workers, organisational solutions and data processing in developed “Mistrz” IT system has been described, as well as problems with MIAS encountered during system operation in early stages of introduction.
Using Genetic Algorithms for Exploring the Solution Space in the Case of Automated Product Design
Authors: Matei Oliviu Dorin
Published: November 2015

We present a novel approach for automatically create industrial products, namely powertrains consisting of engine, transmission and power shaft. We apply a genetic algorithm for exploring the solution space, consisting of 3000 variants, using various criteria, such as power, efficiency and rotation speed. We compare our results with the ones obtained by a human expert in terms of number of feasible solutions, respectively in terms of best and average price. We prove that the proposed approach is generally better than a human expert in exploring the solution space.
ISO 9001 International Standard, a Tool to Enhance Data Quality in Durable Socio-Technical Systems
Authors: Sava Alexandre , Adjallah Kondo , Zichil Valentin
Published: November 2015

The quality of data is recognized to be a key issue for the assets management in enterprises as data is the foundation of any decision making process. Recent research work has established that the quality of data is highly dependent on the knowledge one has on the socio-technical system being considered. Three modes of knowledge have been identified: knowing what, knowing how and knowing why. In this paper we focus on how to manage these modes of knowledge in durable socio-technical systems to enhance the data quality face to technological progress and employees turnover. We believe that an organization based on ISO 9001 international standard can provide a valuable framework to provide the data quality needed to an efficient decision making process. This framework has been applied to design the data quality management system within a high education socio-technical system. The most important benefits that have been noticed are: 1) a shared vision on the external clients of the system with a positive impact on the definition of the strategy and the objectives of the system and 2) a deep understanding of the data client-supplier relationship inside the socio-technical system. A direct consequence of these achievements was the increasing knowledge on “know-what” data to collect, “know-why” to collect that data and “know-how” to collect it.
Integration of Modern Tools as Part of Concurrent Engineering in Mechanical Designs
Authors: Mihalache Marius Andrei , Nagit Gheorghe , Ripanu Marius Ionut
Published: November 2015

The modern tools of today's concurrent engineering (CE) based management are a wide array of instruments, plans, software, technical skills, human capabilities and resources. This paper aims to emphasize the benefits of such a system implementation in a business environment based on case studies retrieved from scientific literature and author's personal experience in a private working environment. Constant team sessions, briefs, workshops and brainstorming sessions proved to be very powerful tools for the management teams subjected to these studies in order for them to develop fully stable concurrent teams. The paper also highlights the fact that even from the implementation phase the workflow within the CE offers excellent opportunities for continuous improvements of the system and fine tunings of tools that are correspondent to it. As result, CE proves to be one of the best systems around in terms of efficiency, scalability and of course, results.
Successful Career in Manufacturing Enterprises
Authors: Stan Luciana Cristiana , Windsperger Josef
Published: November 2015

Permanent changes and controlled environmental conditions change in operating companies and requires new management methods. Success in modern sustainable development is an area of concern for both managers and for people science. Article discusses the career success in industrial enterprises which promotes sustainable development by setting the quantitative and qualitative components, identify methods for assessing employee performance, productivity measurement and analyzes the changing resource targeting mechanisms that drive towards achieving sustainable excellence of industrial companies.
Determining the Equation of the Impact Forces Produced by Water Jets Used in Sewer Cleaning
Authors: Medan Nicolae , Ravai Nagy Sándor
Published: November 2015

Since 1950, the use of water jets has grown in the field of cleaning pipes and sewers. The regular cleaning of the materials deposed in sewer networks is realised especially with equipment that uses high pressure water jets. The functioning of this equipment is dependent on certain process parameters that can vary, causing variations of the impact forces. The impact force directly affects the cleaning of sewer systems. This article is a part of research activity what is centered on the study of the cleaning head - sewer system. The purpose of this research is to determine an equation of the impact forces of the water jet that depend on process parameters. The research method used is that of the full factorial plan. For the experimental determination of the impact forces a stand for generating water jets and a device for measuring the forces of impact are used. The equation of the impact forces measured is determined using the software Minitab 17.
Some Aspects about the Using of a Software Product in the Assessment of the Pollutant Emissions to the Oil and Gas Industry
Authors: Pana Ion , Lambrescu Ionuţ
Published: November 2015

This paper presents some methods used in the study of pollutant emission and immission (limited to gaseous petroleum products), grouped into a software application PDA V 1.04 (PollutantsDispersionAssessment). It includes: the calculus of the exhaust of pipelines / pressure chambers, specifying the time of discharge; dimensioning of the exhaust stacks for gaseous petroleum products; dimensioning of the flares, including thermal calculation; the calculus of dispersion of pollutants, specifying the immission value at ground level. It was designed especially for the training activity of undergraduates from the Petroleum-Gas University of Ploiesti (PGUP) Romania with other e-learning and didactic applications, but can be used also, in the field applications
Quality and Environmental Evaluation Methodsfor Metallic Materials Industry
Authors: Ioana Adrian , Semenescu Augustin , Marcu Dragoş , Pollifroni Massimo , Březinová Monika
Published: November 2015

We present in our article some original quality evaluation methods for Metallic Materials Industry (MMI). Also we present categories of environmental performance indicators. They should therefore be cost-effective and appropriate to the size and type of organization and its needs and priorities. The paper presents the main methods of technical-economical analysis of the quality of the metallic materials industry. There are mainly presented and analyzed a specific analysis models. Both the analysis methods for products (A) and the ones for companies (B) are presented in comparison. The main results consist of the correlation between the technical – economical analysis methods and the mathematical models used. Also we present in our article the main categories of environmental performance indicators: comparability, balance between problematic (bad) and prospective (good) areas, continuity, timeliness, clarity, operational performance indicators, management performance indicators, environmental condition indicators.
The Influence of Cutting Regimes on the Obtained Surface Quality through the Milling of Vulcanized Rubber
Authors: Mocerneac Bogdan Emanuel , Lobonțiu Mircea
Published: November 2015

Throughout my doctoral study I have encountered the problem of milling vulcanized rubber in a company specialized in the production of V-belts, which uses milling to generate the final surface of an assortment of V-belts. In this process I have encountered difficulties starting from fastening up to milling the rubber. At vulcanized rubber any error makes the workpiece to be rejected without the possibility to fix it, or not even to reuse the material. The reject rate at milling this assortment of V-belts is almost 40%. After we studied the literature from domain, we observed that the cutting issue of flexible polymeric materials is not well defined from some points of view, for this reason we made an experiment to observe the behavior of rubber at cryogenic and conventional milling, with a cutting speed of 2355m/min at a feed range between 0.0025 mm /tooth and 0.02 mm/tooth. As a result of the experimental study of milling vulcanized rubber type 3540, we observed that for the workpieces that were cooled with liquid nitrogen, the reject rate was reduced down to 20%. We also observed that, for the workpieces which were cooled with liquid nitrogen, feed milling had a small influence on the obtained surface quality.
Quality of the Cut Surfaces Processed by AWJC as a Function of the Distance between the Cutting Head and Working Sample
Authors: Herghelegiu Eugen , Radu Crina , Schnakovszky Carol , Zichil Valentin
Published: November 2015

Water jet cutting is one of the newest techniques in non-conventional machining processes. It is a flexible technology since the same equipment can be used to cut virtually any material, such as steel stainless steel, high-nickel alloys and polymer composites (usually, for these materials, the water jet is mixed with an abrasive material, the process being known as abrasive water jet cutting - AWJC) . Compared with the classical technologies, water jet cutting presents the following advantages: very low side forces during machining, it is rapid, it is silent, no thermal distortion, a good cutting accuracy and minimal burrs. To optimize the process, it is necessary to analyze the influence of process parameters on the quality of cut. The aim of this paper is to analyze the influence of distance between the cutting head and the working sample on the quality of cut, quantified by the following parameters: width of the processed surface at the jet inlet, jet outlet, deviation from perpendicularity, inclination angle and roughness.
The Abrasion Mechanism of a Diamond Grinding Wheel with Resin Cured by Ultraviolet Light
Authors: Huang Qiu Yun , Guo Lei , Marinescu Ioan
Published: November 2015

Ultraviolet-cured resin bond, abrasive tools have been studied and have proven to have substantial advantages over conventional abrasive tools, not only in low energy cost and high efficiency when manufacturing the tool itself, but also in better performance when machining some materials [1,2]. However, very little research has been done to study the mechanism of UV cured abrasive tools. Nevertheless, many researchers have investigated the performances of such tools compared with some conventional tools. A mechanism of UV cured, resin bond, diamond wheel was proposed as the hybrid of grinding and lapping, which is called as grind/lap (G/L) process [3]. In the paper, the proposed mechanism was verified by comparing the experimental results of three processes. Three wheels were used to simulate grinding, lapping and grind/lapping operation separately under the same experimental setting. The results showed that the RA obtained by G/L wheel decreased to a value between those gained by grinding and lapping operations after 10 minutes and it became the lowest of the three as time increases. The RA and MRR of three processes indicated that at the beginning of operation, the abrasives in G/L wheel are fixed by the cured resin, and as machining time increases, the small grains get released from the wheel and act as loose abrasives. Therefore, the mechanism of the UV cured resin bond diamond wheel is verified as the dominant grinding at the beginning and lapping at the end, which was also illustrated by the surface profile of machined part.